Institute Booklet - 2000-2002

 

BALATON LIMNOLOGICAL RESEARCH INSTITUTE

OF THE HUNGARIAN ACADEMY OF SCIENCES

2003-2007

 

Contents

Organization, institute´s staff

Director: Péter Bíró, ordinary member of HAS, research professor

Deputy Scientific Director: Károly Elekes, DSc, scientific adviser

Deputy Financial Director: Mária Valéria Pásti Hriczu

Department of Hydrobotany

Head of Department: Lajos Vörös, DSc, scientific adviser

Research team of Algology

Team leader: Lajos Vörös, DSc, scientific adviser

Attila Kovács, PhD, research fellow

Boglárka Somogyi, assistant research fellow

Balázs Németh, technician

Erzsébet Lakatos Kismődiné, technician

Research team of Nutrient Cycling

Team leader: Mátyás Présing, CSc, senior research fellow

Sándor Herodek, DSc, scientific adviser

Katalin V.-Balogh, CSc, senior research fellow

Gyöngyi Kenesi, assistant research fellow

Terézia Horváth, technician

Erika Kozma, technician

Research team of Macrophytes

Team leader: Viktor Tóth, PhD, research fellow

Viktória Lukács, assistant research fellow

Ágnes Vári, assistant research fellow

András Zlinszky, assistant reseach fellow

Department of Hydrozoology

Head of Department: Péter Bíró, ordinary member of HAS, research professor

Research team of Zooplankton and Periphyton

Team leader: László G.-Tóth, DSc, scientific adviser

Jenő Ponyi, DSc, scientific adviser

Ilona Muskó B., CSc, senior research fellow

Csilla Balogh, assistant research fellow

Ildikó Starkné Mecsnóbel, technician

Tünde Polgárdiné Klein, technician

Henriette Szabó, technician

Research team of Fish and Benthos

Appointed team leader: András Specziár, PhD, senior research fellow

Péter Bíró, ordinary member of HAS, research professor

Tibor Erős, PhD, senior research fellow

Arnold Móra, assistant research fellow

Péter Takács, assistant research fellow

Beáta Maroskövi, technician

Borbála Varanka, technician

Research team of Bioacustics and Biomanipulation

Team leader: István Tátrai, CSc, senior research fellow

Gábor Paulovits, PhD, senior research fellow

Gergely Boros, assistant reseach fellow

Zoltán Poller, technician

Gábor Poór, technician

Department of Experimental Zoology

Head of Department: Károly Elekes, DSc, scientific adviser

Research team of Comparative Neurobiology

Team leader: Károly Elekes, DSc, scientific adviser

Tibor Kiss, DSc, scientific adviser

László Hernádi, CSc, senior research fellow

László Hiripi, CSc, senior research fellow

Zoltán Serfőző, PhD, research fellow

Attila Szűcs, PhD, senior research fellow

Gábor Miklós Balog, assistant research fellow

Adrienn Filla, assistant research fellow

Zsolt Pirger, assistant research fellow

Boldizsár Balázs, technician

Zita László, technician

Zsuzsanna Fekete Nagyné, technician

Katalin Ihász Erőssné, technician

Research team of Neuro- and Ecotoxicology

Team leader: János Győri, PhD, senior research fellow

Ágnes Vehovszky, CSc, senior research fellow

Anna Farkas, PhD, senior research fellow

Mariann Gácsi, assistant research fellow

Eugénia Hollósy Balázsné, technician

Department of Finances

Head of Department: Mária Valéria Pásti Hriczu

Ágnes Tóth, book-keeper, financial team leader

László Bakos, financial assistant, stock-keeper

István Kuti, purchaser, cars´ executive

Réka Németh, financial assistant

Istvánné Soós, wage accounter and labour executive

Zsuzsanna Seregély, financial assistant, cashier

Tibor Blénessy, guardian

Sándor Bálint, porter

Csaba Bíró, gardener

Géza Dobos, ship-mechanic

Péter Harmati, maintainer

Károly Horváth, night-watcher

László Táncsics, electrotechnician

Csabáné Marton, cleaner

György Molnár, gardener

Ákos Németh, driver

Sándor Polgárdi, porter

Lajos Sarang, carpenter

Péterné Söjtöry, cleaner

Ferencné Szabó, cleaner

László Szombati, night-watcher

Gyuláné Vincellér, cleaner

Central Administration

Rózsa Kis Horváthné, librarian

Krisztina Komáromi, secretary

Sándorné Komáromi, secretary

Lászlóné Szeiberling, receptionist

_______________________________________

DSc: doctor of biological sciences

CSc: candidate of biological sciences

PhD: philosophical doctor (university doctor)

HAS: Hungarian Academy of Sciences

 

Scientific program

Main research projects of the Institute

2003-2007
  1. Eutrophication processes of Lake Balaton
  2. Production, population dynamics and feeding, zootaxonomy of aquatic invertebrates in Lake Balaton
  3. Dynamics and biology of fish populations in Lake Balaton
  4. Comparative neurobiology and embryogenesis of neurotransmitter systems and receptors
  5. Neuro- and ecotoxicology of aquatic invertebrates (from 2005)

 

Grants

Grants from the Hungarian Scientific Research Fund

Accumulation and effects of organic environmental pollutants on the behavior of aquatic organisms, T032390, 2000-2003, (Principal investigator: Anna Farkas)

Study of the population dinamics, feeding, reproduction and oxygen consumption of planktonic and benthic crustaceans of Lake Balaton, T032175, 2000-2003 (Principal investigator: László G.-Tóth)

Neurochemical basis of morphogenesis and behavioural development in invertebrates, T034106, 2001-2004 (Principal investigator: Károly Elekes)

Life cycle, population dynamics and feeding of zebra mussel (Dreissena polymorpha) in Lake Balaton, T034813, 2001-2004 (Principal investigator: Ilona B. Muskó)

Possible regulatory role of serotonin and dopamine in the feeding of gastropods, T037389, 2002-2005 (Principal investigator: László Hernádi)

Effect of environmental pollutants on elementary and complex neural processes, T037505, 2002-2005 (Principal investigator: János Győri)

Productivity and diversity of phytoplankton in picoplankton dominated water bodies, T042977, 2003-2006 (Principal investigator: Lajos Vörös)

Analysis of the cellular mechanisms of neuromodulation in neuro-muscular and neuro-glandular connections, T043216, 2003-2006 (Principal investigator: Tibor Kiss)

Activity and information dependent synaptic plasticity in in vitro neuronal networks, T043162, 2003-2006 (Principal investigator: Attila Szűcs)

Biomonitoring of biodiversity, structure and trophic relationships of invertebrate and vertebrate (fish) communities in the littoral zone of Lake Balaton, T042622, 2003-2006 (Principal investigator: Péter Bíró)

Ontogenetic diet shifts and their effects on growth and food resource partioning in fish in Lake Balaton, T046222, 2004-2007 (Principal investigator: András Specziár)

Characterization of neuronal and extraneuronal receptors in invertebrates, T046580, 2004-2007 (Principal investigator: László Hiripi)

Relationship between food web and trophic conditions, T048758, 2005-2008 (Principal investigator: István Tátrai)

Spatial and temporal organization of inter- and intracellular signaling mechanisms in the nervous system of invertebrates, T049090, 2005-2008 (Principal investigator: Károly Elekes)

Effect of the turbulence on the structure and function of the zooplankton, T049365, 2005-2008 (Principal investigator: László G.-Tóth)

Role of ultraviolet radiation in the transformation and degradation of dissolved organic substances in lakes, K63296, 2006-2009 (Pricipal investigator: Katalin V.-Balogh)

Neuronal substrate(s) of cyanotoxin effects produced by freshwater algae - in vivo studies on model freshwater invertebrate organisms, K63451, 2006-2009 (Principal investigator: Ágnes Vehovszky)

 

Grants from the Office of the Prime Minister

2003

Role and regulating factors of the planctonic and the bentic algal communities in Lake Balaton (Principal investigator: Lajos Vörös)

Phosphorus uptake of phytoplankton with especial regard to the role of exoenzymes (Principal investigator: László Hiripi)

Nitrogen demand of phytoplankton and the significance of several nitrogen sources of Lake Balaton (Principal investigator: Mátyás Présing)

Effect of meteorological and hydrological changes on the role of dissolved organic(humic) substances in Lake Balaton (Principal investigator: Katalin V.-Balogh)

Comparative studies on healthy and decaying reed stands (Principal investigator: Sándor Herodek)

Research of the zooplankton and invertebrates living in the encrustation in Lake Balaton (Principal investigator: László G.-Tóth)

Zoological investigations in the River Zala (Principal investigator: Jenő Ponyi)

The effect and biological role of silver carp in Lake Balaton (Principal investigator: István Tátrai)

Feeding strategy, trophic relationships, growth and survival of juveniles of native fish species in Lake Balaton (Principal investigator: András Specziár)

Assessment of environmental pollutants in Lake Balaton and the toxic effect assessment of contaminants on the behaviour of aquatic biota (Principal investigator: Anna Farkas)

2004

Role and regulating factors of the planktonic and the bentic algal communities in Lake Balaton (Principal investigator: Lajos Vörös)

Phosphorus uptake of phytoplankton with especial regard to the role of exoenzymes (Principal investigator: László Hiripi)

Nitrogen demand of phytoplankton and the significance of several nitrogen sources of Lake Balaton II (Principal investigator: Mátyás Présing)

Effect of meteorological and hidrological changes on the role of organic(humic) substances in Lake Balaton (Principal investigator: Katalin V.-Balogh)

Comparative studies on healthy and decaying reed stands (Principal investigator: Sándor Herodek)

Study of invertebrates of the open water and the littoral zone of Lake Balaton (Principal investigator: László G.-Tóth)

Zoological investigations in the River Zala (Principal investigator: Jenő Ponyi)

The effect and biological role of silver carp in Lake Balaton (Principal investigator: István Tátrai)

Feeding strategy, trophic relationships, growth and survival of juveniles of native fish species in Lake Balaton (Principal investigator: András Specziár)

Assessment of environmental pollutants in Lake Balaton and the toxic effect assessment of contaminants on the behaviour of aquatic biota (Principal investigator: Anna Farkas)

2005

Role and regulating factors of the planktonic and the bentic algal communities in Lake Balaton (Principal investigator: Lajos Vörös)

Nitrogen demand of phytoplankton and the significance of several nitrogen sources of Lake Balaton III (Principal investigator: Mátyás Présing)

Effect of meteorological and hidrological changes on the role of organic(humic) substances in Lake Balaton (Principal investigator. Katalin V.-Balogh)

Microbial phosphorus metabolism in Lake Balaton (Principal investigator: Sándor Herodek)

Study of invertebrates living in the encrustations of the littoral zone of Lake Balaton and of the Decapoda in 2005 (Principal investigator: Ilona B. Muskó)

Zoological investigations in the River Zala (Principal investigator: Jenő Ponyi)

The effect and biological role of silver carp in Lake Balaton (Principal investigator: István Tátrai)

Feeding strategy, trophic relationships, growth and survival of juveniles of native fish species in Lake Balaton (Principal investigator: András Specziár)

2006

Role and regulating factors of the planktonic and the bentic algal communities in Lake Balaton (Principal investigator: Lajos Vörös)

Microbial phosphorus metabolism in Lake Balaton (Principal investigator: Sándor Herodek)

Growth of Cylindrospermopsis raciborskii nitrogen-fixing blue-green algae on different nitrogen sources (Principal investigator: Mátyás Présing)

Role of autochthonous and allochthonous organic substances in water quality in Lake Balaton (Principal investigator: Katalin V.-Balogh)

Study of invertebrates living in the encrustation of reeds in Lake Balaton in 2006 (Principal investigator: Ilona B. Muskó)

Morphometric comparison of reed stands from northern and southern shoreline of Lake Balaton (Principal investigator: Viktor Tóth)

The effect and biological role of fish stocks introduced into Lake Balaton (Principal investigator: István Tátrai)

Fish stock monitoring according to the EU WFD in Lake Balaton (Principal investigator: András Specziár)

Investigations on the macrozoobenthos of Lake Balaton and its inflows in the frame of the EU WFD (Principal investigator: Arnold Móra)

Assessment of the production of toxins by blue-green algae from Lake Balaton and the Kis-Balaton reservoir (Principal investigator: Anna Farkas)

 

Grants from the Ministry of Agriculture and Rural Development

2003

Natural recruitment of bream- and pikeperch populations in Lake Balaton (Principal investigator: András Specziár)

2005

The stock size and structure of silver carp in Lake Balaton (Principal investigator: István Tátrai)

 

Other grants

Aspects of energy and matter transport of the feeding of some fish species in the open areas of the Kis-Balaton Water Protection Reservoir (KBWPR) - OVIBER (Principal investigator: István Tátrai)

Sediment toxicity assessment in the Kis-Balaton Water Protection System I. - OVIBER (Principal investigator: Gábor Paulovits)

Analysis of phosphorus cycling processes - OVIBER (Principal investigator: Vera Istvánovics)

Ecological quality status of Lake Balaton assessed by the measures of the zooplankton - BMGE (Principal investigators: László G.-Tóth)

Actual questions and perspectives of biological exploitation of natural water: fisheries - reed-grass farming - recreation - ecotourism. - NKFP-3B/014/2002, NKFP 2002-2005 (Principal investigators: Péter Bíró)

Biomonitoring studies on the spring-lake Hévíz - Hévíz Spa and Szent András Rheumatism Hospital Ltd. (Principal investigator: Jenő Ponyi)

Study the effect of vinpocetine using in-vivo rotenone test and in vitro neurotransmission - Gedeon Richter Pharmaceutical Company Ltd. 2006 (Principal investigator: János Győri)

Sodium channel inhibitors as analgesics exploration of "functional selectivity" using a biophysical-property-sensitive screening approach - KOKI-MTA BLKI 2007 (Principal investigator: János Győri).

Fishfaunistic research on the Natura 2000 areas of the Bükk National Park. - Directorate of the Bükk National Park (Principal investigator: Péter Takács)

Fishfaunistic monitoring of the Csincse small watercourse. - Directorate of the Bükk National Park (Principal investigator: Péter Takács)

Elaborating practical approaches for reedbed a management in Lake Balaton. - KÖDU-KÖVIZIG 2007 (Principal investigator: Viktor Tóth)

 

Grants for international cooperations

Octopamine in a rhythmic network: cellular mechanisms of heterosynaptic modulation. Wellcome Trust, 2001-2003 (Principal investigators: Christopher H. J. Elliott and Ágnes Vehovszky)

Identification of non-linear activity in neural networks, HAS-CNR, 2001-2003 (Principal investigators: Attila Szűcs and Michele Barbi)

Cellular and molecular basis of the modulation of behaviors in invertebrate model animals - Institute of Developmental Biology and Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow, Russia, HAS-RAS, 2005-2007 (Principal investigators: Károly Elekes, I. S. Zaharov and P. M. Balaban)

Quantifying and differentiating the sources of stress on macrophyte development through remote sensing. Ministry of Education - British Council, 2002-2004 (Principal investigators: Mátyás Présing and Tom Preston)

Public attitudes to biodiversity and its conservation - EU Alter-Net (RA5) (Principal investigator: István Tátrai)

Biological invasion in freshwater amphipod crustaceans: consequences on life-history traits and parasitism. - Hungarian-French Intergovernmental Scientific and Technological Cooperation (TéT), 2004. (Principal investigator: Ilona B. Muskó)

Multicoding in bursting neurons. - Hungarian-Spanish Intergovernmental Scientific and Technological Cooperation (TéT), 2007-2008. (Principal investigator: Attila Szűcs)

 

Calendar of Events

Changes in the Institute´s staff of scientists

Appointed:

2003

Viktória Lukács, assistant research fellow (young scientist position from HAS)

Gyöngyi Kenesi, assistant research fellow (young scientist position from HAS)

2004

Balázs Németh, technician

Boglárka Somogyi, assistant research fellow (young scientist position from HAS)

2005

Péter Bíró, corresponding member of HAS, director (1. January 2003 - 31. December 2004, Director: Dr. Sándor Herodek, DSc)

Tibor Erős, PhD, senior research fellow

Zoltán Serfőző, PhD, research fellow

Mariann Gácsi, assistant research fellow

Gábor Miklós Balog, assistant research fellow (young scientist position from HAS)

Arnold Móra, assistant research fellow (young scientist position from HAS)

Péter Takács, assistant research fellow (young scientist position from HAS)

2006

Ágnes Vári, assistant research fellow (young scientist position from HAS)

Gergely Boros, assistant research fellow (young scientist position from HAS)

Noémi Tóth, assistant research fellow (young scientist position from HAS)

2007

András Zlinszky, assistant research fellow (young scientist position from HAS)

Zoltán Poller, technician

Left the Institute:

2003

Gábor Molnár, research fellow

Katalin Nagy Hölvényiné, technician

†János Salánki, member of HAS (1929-2003)

2005

Péter Juhász, PhD, research fellow

Eszter Koncz, assistant research fellow

Endre Hegedűs, assistant research fellow

2006

Zsolt Litkey, technician

2007

Noémi Tóth, assistant research fellow

Krisztina Szalontai, assistant research fellow

Scientific degrees

Doctor of Sciences (DSc):

László G.-Tóth, 2003

PhD degree:

Anna Farkas, 2003

Attila Kovács, 2004

Endre Hegedűs, 2005

Arnold Móra, 2007

Péter Takács, 2007

University habilitation:

László G.-Tóth, 2004

Honorary professor:

Lajos Vörös, 2004

Position changes:

László G.-Tóth, scientific adviser, 2003

Anna Farkas, senior research fellow, 2003

Attila Kovács, research fellow, 2003

Endre Hegedűs, research fellow, 2005

Arnold Móra, research fellow, 2007

Péter Takács, research fellow, 2007

 

Foundation

Board members of the trustees of the "Balaton Research Foundation", registered by the Veszprém County Court on 22. April, 1990.

President: Jenő Ponyi, DSc, scientific adviser

Members: Miklós Bercsényi, Mária Dinka, Béla Entz, Ferenc Máté, Vince Ördög, Sugárka Kelecsényi, Attila T. Szabó, Lajos Vörös.

 

Domestic cooperations

Fish Culture Research Institute (Szarvas) "Biomanipulation".

Department of General Zoology and Neurobiology, University of Pécs (Pécs) "Comparative functional neuroanatomy of invertebrates".

University of Debrecen, Faculty of Sciences, Department of Animal Anatomy and Physiology, "Functional morphology of the nitrogen monoxidergic system in the developing and adult nervous system of gastropods".

University of Debrecen, Department of Applied Ecology, "Structure and biodiversity of the epiphyton and epilithon, and the role of fish food in the coastal region of Lake Balaton".

University of Pannónia (Veszprém), Dept. of Environmental Engineering and Chemical technology: "Ecotoxicological assessment in the Hídvégi pond and Fenéki pond of the Kis-Balaton Water Protection System"

Western Transdanubian Water Authority (Keszthely): "Fish ecological research in the Hídvégi pond and Fenéki pond of the Kis-Balaton Water Protection System"

HAKI (Research Institute for Fish Culturing) Szarvas: "Size and role of prussian carp stocks in the nutrient cycle of the Kis-Balaton Water Protection System"

Lake Balaton Fishing Ltd. "Abundance estimation of pikeperch fingerlings in Lake Balaton and the genetic separability of Lake Balaton's pikeperch - Lake Balaton Fishing Ltd.".

 

University lecturing

Péter Bíró at the Department of Ecology and at the Department of Zoology, Center for Agricultural Sciences, Debrecen University, lecturing on "Biology of fishes", in gradual program.

Péter Bíró at the Department of Ecology, Debrecen University, lecturing on "Aquatic ecology" in postgradual (PhD) program.

Péter Bíró at the Department of Animal Geography and Ecology, University of Pécs, lecturing on "Hydrobiology".

Károly Elekes at the Department of General Zoology and Neurobiology, University of Pécs, lecturing on "Comparative neurobiology of invertebrates" in gradual and postgradual (PhD) programs.

László G.-Tóth at the Department of Limnology, University of Pannonia lecturing on "Deep sea biology"; and at the West Hungarian University, lecturing on "Plankton research".

János Győri at the Department of Informatics, Veszprém University, lecturing on "Basic neurobiology", in gradual and postgradual (PhD) programs.

Péter Juhász at the Department of Hydrobiology, University of Debrecen, lecturing on "Hydrozoology".

Arnold Móra at the Department of Hydrobiology, University of Debrecen, lecturing practical courses on "Hydrozoology", "General ecology", "Hydrobiology", "Assessing Environmental Quality", "Population ecology" and "Biomonitoring", at the College of Nyíregyháza, practical courses on "Synbiology" and Hydrozoology", at the University of Pécs, lecturing on "Aquatic macroinvertebrates" in gradual programs.

Jenő Ponyi at the University of Pannonia, Georgikon Faculty of Agriculture (Keszthely), lecturing on "Hydrobiology", in postgradual program.

Attila Szűcs at the Department of General Zoology and Neurobiology, University of Pécs, lecturing on "Comparative neurobiology" in postgradual (PhD) program.

Attila Szűcs at the Faculty of Informatics, University of Pannonia, lecturing on "Neurobiology" in gradual program.

Péter Takács at the University of Pécs, lecturing on "Ichthyology" in gradual program.

István Tátrai at the Department of Ecology, University of Debrecen, lecturing on "Aquatic ecology" in postgradual program.

István Tátrai at the Department of Microbiology, Eötvös Lóránd University; Limnology Department of the Pannon University; Fishery Department of Szent István University, practical courses on "Aquatic ecology" in gradual program.

Viktor Tóth at the Department of Limnology, University of Pannonia. Lectures in Applied Plant Ecology, Reedbed management.

Ágnes Vehovszky at the Faculty of Informatics, University of Pannonia, lecturing on "Neurobiology" in gradual program.

Lajos Vörös: Pannon University, Veszprém, lecturing on "Plant systematics and anatomy", University of West Hungary (Mosonmagyaróvár) lecturing on "Algal systematics and ecology".

 

PhD training

Péter Bíró: University of Debrecen, Szent István University, Gödöllő (PhD adviser, member of the Habilitation Committee)

Károly Elekes: University of Pécs, University of Debrecen (PhD adviser)

Tibor Erős: Szent István University, Gödöllő (PhD adviser)

László G.-Tóth: University of Debrecen, University of Pannonia, Eötvös Loránd University (PhD adviser)

Ilona B.-Muskó, University of Pannonia (PhD adviser)

Mátyás Présing: University of Pannonia (PhD adviser)

Zoltán Serfőző: University of Debrecen (PhD adviser)

András Specziár: University of Debrecen (PhD adviser, MSc adviser)

István Tátrai: University of Debrecen; Pannon University (MSc and PhD adviser)

Katalin V.-Balogh: University of Pannonia (PhD adviser)

Lajos Vörös: Eötvös Loránd University, Budapest; University of Debrecen, Debrecen, Babes-Bolyai University, Cluj-Napoca, Romania (PhD adviser)

 

Other training activities, practicals

Annually, during summer-period, the Institute received about twenty university students, who participated in realizing different tasks of the research projects. In addition, the Institute received regularly visiting groups of students from different Hungarian Universities, informing them about the research activities, projects and the most important results. A number of university students have finished as well as have been preparing their diploma thesis in the Institute.

 

International relationships

We had scientific cooperation with the following institutes abroad in the following topics.

Department of Hydrobiology

Scottish Universities Research and Reactor Centre, East Kilbride, Glasgow, UK, "Nitrogen regeneration and the support of standing crop in Lake Balaton". (Mátyás Présing).

Biological Research Institute, Romanian Academy of Sciences, Bucharest, Romania, "The structural aspects of zooplankton community in lenitic ecosystems". (László G.-Tóth)

University of Granada, Department of Animal Ecology, Granada, Spain, "Study of the efficiency of the energy transfer and energy loss of the limnetic food webs". (László G.-Tóth)

University of Stirling, Stirling, Glasgow, UK, "Quantifying and differentiating the sources of stress on macrophyte development through remote sensing". (Mátyás Présing)

Bourgogne University, Dijon, France, "Biological invasion of freshwater amphipod crustaceans: consequences in the life cycle and parasitism." (Ilona B. Muskó)

Rheinische Friedrich-Wilhelms-University Bonn, Institute for Zoology, Bonn, Germany, "Morphological variations of the fish lateral line and its relationship with habitat preference." (Tibor Erős)

Karlstad University, Department of Biology, Karlstad, Sweden, "Aquatic terrestrial linkages in a boreal stream: trophic level responses to light and terrestrial invertebrate input." (Tibor Erős)

University of Jyväskylä, Finland, Comparative studies on food web structure (István Tátrai - since 2007)

Department of Experimental Zoology

Abo Akademi University, Biocity, Department of Biology, Turku, Finland, "Comparative neurobiology of histaminergic systems". (Károly Elekes)

Tokushima Bunri University, Faculty of Pharmaceutical Sciences, Laboratory of Functional Biology, Sanuki, Japan, "Identification of the glutamatergic system in the nervous system of Gastropods" (Károly Elekes)

Institute of Developmental Biology and Institute of Higher Neuron Activity and Neurophysiology, RAS, Moscow, Russia, "Cellular and molecular basis of the modulation of behavior" (Károly Elekes)

University of York, Department of Biology, York, UK, Wellcome Trust, "Octopamine in a rhythmic network: cellular mechanisms of heterosynaptic modulation" (Ágnes Vehovszky)

University of Sussex, School of Biology, Brighton, U.K., "Learning and memory in invertebrates" (Tibor Kiss)

Institute of Nonlinear Science, University of California at San Diego, San Diego, La Jolla, USA, "Identification of non-linear activity in neural networks" (Attila Szűcs)

Al-Azhar University, Assiut, Egypt, "Selection of appropriate biomonitors for the assessment of environmental heavy metal pollution" (Anna Farkas)

Institute di Biofisica, CNR, Pisa, Italy, "Identification of nonlinear activity in neuronal networks" (Attila Szűcs)

 

Visiting scientists

2003

Thierry Rigaud and Remi Wattier, Bourgogne University, Dijon, France, 4-8 April.

Laura Parpala, Biological Research Institute, Romanian Academy, Bucharest, Romania, 1-18 August.

2004

Dai Hatakeyama, Hokkaido University, Sapporo, Japan, 5 September - 3 October.

Remi Wattier, Bourgogne University, Dijon, France, 10-19 September.

Loic Bollache, Bourgogne University, Dijon, France, 10-19 September.

Yannick Moret, Bourgogne University, Dijon, France, 10-19 September.

Laura Parpala, Biological Research Institute, Romanian Academy, Bucharest, Romania, 1-18 August.

2005

Borek Drozd, Charles University of Prague, Faculty of Sciences, Department of Zoology, Prague, Czech Republic, 27 May - 15 June.

Tom Preston, Isotope Biochemistry Laboratory, Scottish Universities Environmental Research Centre Glasow, Glasgow, Scotland, 18-25 June, 7-10 September.

Peter Hunter, Department of Environmental Science, University of Stirling, UK, 4-10 September.

Andrew Tyler, Department of Environmental Science, University of Stirling, UK, 4-10 September.

Natalia L. Kononenko, Kaliningrad University, Kaliningrad, Russia, 12 April - 11 July.

Dai Hatakeyama, Hokkaido University, Sapporo, Japan, 3-10 October.

Dorottya Bányász, University of Babes-Bolyai, Cluj-Napoca, Romania, 1 July - 31 August.

2006

Parpala, Laura, Biological Research Institute, Romanian Academy, Bucharest, Romania, 1-18 August.

Bálint, Miklós, Babes-Bolyai University, Cluj-Napoca, Romania, 1-10 May, 26 June - 7 July.

2007

Okamoto, Takanobu, Tokyo Metropolitan University, Tokyo, Japan, 19 February - 27 March.

Kobayashi, Suguru, Tokushima Bunri University, Sanuki, Japan, 3-11 May.

Abdelkhalik, Abdallah A. T., Al-Azhar University, Assiut, Egypt, 11-25 May.

Parpala, Laura, Biological Research Institute, Romanian Academy, Bucharest, Romania, 16-30 June.

Voronezhskaya, Elena E., Institute of Developmental Biology, RAS, Moscow, Russia, 12 August - 13 September.

Vorontzov, Dmitrij, Koltzov Institute of Developmental Biology, RAS, Moscow, Russia, 25 August - 30 September.

 

Travels

2003

László G.-Tóth

- "European strategy for protection and conservation of the marine environment" MCMP meeting, Copenhagen, Denmark, 4-6 December.

János Győri

- 6th IBRO World Congress of Neuroscience, Prague, Czech Republic, 10-15 July.

László Hernádi

- Wellcome Trust, University of York, Department of Biology, York, England, 5-25 April.

Péter Juhász

- Tara River Project, Univerzitet Crna Gora, Crna Gora, Serbia-Montenegro, 5-15 May.

Tibor Kiss

- University of Sussex, School of Biology, Brighton, U.K., 24 October - 6 December.

Ilona Muskó, B.

- 11. Crustaceologentagung Conference, Ulm, Germany, 20-23 February.

- XI. Internationa Colloquium on Amphipoda Conference, Tunis, Tunisia, 25-30 March.

- Lake Shores 2003. Conference, Konstanz, Germany, 19-21 June.

- Marie Curie Training Network, University of Dijon, Dijon, France, 10-11 July.

Attila Szűcs

- Institute for Nonlinear Science, University of California, San Diego, USA, 15 January - 4 July.

- 33rd Annual Meeting of the Society for Neuroscience, New Orleans, USA, 8-11 November.

István Tátrai

- LIMPACS meeting - Workshop on Long-term lake response to reduced nutrient loading, Silkeborg, Denmark, 18-22 January.

- Internationa Workshop on Ecohydrology for Theory to Action, Wierzba, Poland, 18-21 May.

- Lakeshores 2003 Conference, Konstanz, Germany, 19-21 July.

Ágnes Vehovszky

- Society of Experimental Biology (SEB Annual Meeting), Southampton, England, 31 March - 4 April.

- University of York, Department of Biology, York, England, 5-25 April.

- University of York, Department of Biology, York, England, 17 November - 20 December.

Lajos Vörös

- Soó Rezső Centennial Anniversary, Székelyudvarhely, Romania, 30 July - 3 August.

2004

Péter Bíró

- IUBS General Assembly, Cairo, Egypt, 18-22 January.

- XI. European Congress of Ichthyologists, Tallin, Estonia, 6-10 November.

Ilona B. Muskó

- University of Bourgogne, Dijon, France, 1-10 June.

- SIL XXIX Congress, Lahti, Finland, 8-14 August.

Károly Elekes

- Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo, Japan, 10-29 May.

- 34th Annual Meeting of SfN, San Diego, USA, 22 October - 4 November.

- 4th Forum of European Neuroscience (FENS 2004), Lisbon, Portugal, 9-16 July.

Anna Farkas

- Workshop of the International Association of Danube Research, Petronell Carnuntum, Austria, 14-17 October.

László G.-Tóth

- European Commission DG Joint Research Centre (JRC), Institute of Environment and Sustainability, Ispra, Italy, 1-4 April.

- Biological Research Institute, Romanian Academy, Bucharest, Romania, 20 August - 3 September.

- European Commission DG Joint Research Centre (JRC), Institute of Environment and Sustainability, Ispra, Italy, 1 November 2004 -28 February 2006.

János Győri

- 4th Forum of European Neuroscience (FENS 2004), Lisbon, Portugal, 10-14 July.

Endre Hegedűs

- Biomedicum, University of Helsinki, Helsinki, Finland, 15 October -15 December.

László Hernádi

- University of York, School of Biology, York, U.K., 5-25 April.

László Hiripi

- Malacology Symposium, Kingston, U.K., 15-18 April.

- University of York, School of Biology, York, U.K., 20-29 April.

Péter Juhász

- Tara River Project, Univerzitet Crna Gora, Crna Gora, Serbia-Montenegro, 5-15 May.

Tibor Kiss

- 4th Forum of European Neuroscience (FENS 2004), Lisbon, Portugal, 9-16 July.

- Univeristy of Sussex, School of Biology, Brighton, U.K., 2-9 December.

Zsolt Pirger

- 4th Forum of European Neuroscience (FENS 2004), Lisbon, Portugal, 9-16 July. Mátyás Présing

- SIL XXIX Congress, Lahti, Finland, 8-14 August.

András Specziár

- XI European Congress of Ichthyology - ECI XI, Tallin, Estonia, 6-10 September.

Attila Szűcs

- Institute for Nonlinear Science, University of California, San Diego, USA, 1 November 2003 - 2 March 2004 and 1 May - 5 September.

- 34th Annual Meeting of SfN, San Diego, USA, 23-27 October.

István Tátrai

- XI European Congress of Ichthyology - ECI XI, Tallin, Estonia, 6-10 September.

- ALTER-Net RA5 EU Workshop, Aberdeen, U.K., 16-18 June.

Katalin V.-Balogh

- SIL XXIX Congress, Lahti, Finland, 8-14 August.

Ágnes Vehovszky

- Malacology Symposium, Kingston, U.K., 15-18 April.

- University of York, School of Biology, York, U.K., 20-29 April.

Lajos Vörös

- IUBS International Conference, Cairo, Egypt, 18-22 January.

- 8th Meeting of Professors from the Carpathian basin, Miercurea Ciuc (Csíkszereda), Romania, 26-27 July.

- SIL XXIX Congress, Lahti, Finland, 8-14 August.

2005

Péter Bíró

- IUBS Workshop and Executive Committee meeting, Paris, France, 1-3 October.

Károly Elekes

- 35th Annual Meeting of SfN, Washington, USA, 11-17 November.

- University of Stockholm, Department of Zoology, Stockholm, Sweden, 30 October -4 November.

Anna Farkas

- I.R.S.A.-C.N.R. Insitute of Brogherio, N.A.T.O.-C.N.R. fellowship, Brogherio, Italy, 1 April - 29 May.

Adrienn Filla

- ISN.ESN 20th Biennal Meeting, Innsbruck, Austria, 21-26 August.

László G.-Tóth

- European Commission DG Joint Research Centre (JRC), Institute of Environment and Sustainability, Ispra, Italy, 1 November 2004 - 28 February 2006.

- EEWAI Lakes Central GIG Meeting, Environmental Agency, London, England, 7-8 February.

- EEWAI & WP6 REBECCA STREP Macrophyte Meeting, Delfts, The Netherlands, 11-13 April.

- EEWAI & WP6 REBECCA STREP Phosphorous Meeting, Edinburgh, Scotland, 18-20 April.

- MPG Symposium on "Science and art in Europe", Berlin-Dahlem, Germany, 22-25 May.

- ASLO Summer Meeting on "A pilgrimage through global aquatic sciences", Santiago de Compostela, Spain, 18-25 August.

- Workshop on "Water level fluctuation in lacustrine ecosystems - ecological impacts and prospects of future climate change", Konstanz, Germany, 11-13 December.

János Győri

- University of Florida, Whitney Laboratory for Marine Biology, St. Augustine, USA, 18 February - 3 June.

László Hernádi

- University of Sussex, School of Biology, Brighton, U.K., 1-30 June.

Ilona B. Muskó

- 6th European Crustacean Conference, Glasgow, Scotland, 18-22 July.

- Fourth Symposium for European Freshwater Sciences, Cracow, Poland, 22-26 August.

- Workshop on Water level fluctuations in lacustrine systems - ecological impacts and prospects of future climate change, Konstanz, Germany, 11-13 December.

Pirger Zsolt

- 15th IUPAB and 5th EBSA International Biophysics Congress, Montpellier, France, 27 August - 1 September.

Mátyás Présing

- Plankton Symposium III., Figueira da Foz, Portugal, 17-20 March.

Hesham Shafik

- Shallow Lakes 2005, Dalfsen, The Netherland, 5-9 June.

András Specziár

- Shallow Lakes 2005, Dalfsen, The Netherland, 5-9 June.

Attila Szűcs

- Institute for Nonlinear Science, University of California, San Diego, La Jolla, USA, 15 January 2005 - 10 January 2006.

István Tátrai

- Shallow Lakes 2005, Dalfsen, The Netherland, 5-9 June.

Lajos Vörös

- Babes-Bolyai University, Cluj Napoca, Romania, 13-16 January.

2006

Károly Elekes

- 5th Forum of European Neuroscience (FENS 2006), Vienna, Austria, 8-12 July.

- Japan, Sodishima Island-Okayama-Osaka-Tokyo-Numazu-Hayama-Sanuki, 27 August - 13 October:

- 2nd International Workshop by Research Groups of Invertebrate Nervous System in Japan, Shodoshima Island, Japan, 29-31 August.

- Animal Physiology Symposium for Chugoku-Shikoku Section 2006, Mt. Daisen, Tottori Prefecture, Japan, 2-3 September.

- Annual Meeting of Kinki-branch of Comparative Physiology and Biochemistry, Osaka, Japan, 12 September.

Tibor Erős

- Karlstad University, Karlstad, Sweden, 1 Januáry - 31 December.

- Nordic Workshop for PhD students on Salmo salar and Salmo trutta research, Karlstad University, Department of Biology, Karlstad, Sweden, 30 March - 2 April.

- Quest lecturer, Umea University, Umea, Sweden, 11 October.

László G.-Tóth

- EU DG JRC & Rebecca Meeting, Varenna, Italy, 8-12 May.

János Győri

- 5th Forum of European Neuroscience (FENS 2006), Vienna, Austria, 8-12 July.

Tibor Kiss

- 5th Forum of European Neuroscience (FENS 2006), Vienna, Austria, 8-12 July.

- Institute of Higher Nervous Activity and Neurophysiology, RAS, Moscow, Russia, 11-13 September.

- "Simpler Nervous System" East-European Regional Conference, Kazany, Russia, 13-17 September.

- Pavlov Institute of Physiology, RAS, St. Petersburg, Russia, 17-12 September.

Attila Kovács

- Satellite Workshop of the 5th International Conference on Reservoir Limnology and Water Quality, Brno, Czech Republic, 1-2 September.

Arnold Móra

- 16th International Chironomid Symposium, Funchal, Madeira, Portugal, 25-28 July.

Ilona Muskó B.

- 14th International Conference on Aquatic Invasive Species, Key Biscayne, USA, 14-19 May.

- European Large Lakes Symposium 2006, Tartu, Estonia, 11-15 September.

Zsolt Pirger

- 5th European Conference of Neuroscience (FENS 2006), Vienna, Austria, 8-12 July.

- University of Sussex, School of Life Sciences, Brighton, U.K., 9-24 December.

Mátyás Présing

- European Large Lakes Symposium 2006, Tartu, Estonia, 11-15 September.

Attila Szűcs

- Mini-conference on "Origin and regulation of bursting activity in neurons", Atlanta, USA, 7-8 April.

- 5th Forum of European Neuroscience, (FENS 2006), Vienna, Austria, 8-12 July.

Péter Takács

- Ecology of Stream fish: State of art and future prospects- II, Leon, Spain, 11-17 June.

István Tátrai

- ALTER-Net Workshop: RA5 Public attitudes to Biodiversity, Oslo, Norway, 19-22 June.

- 5th International Conference on Reservoir Limnology and Water Quality, Brno, Czech Republic, 27-31 August.

- ALTER-Net Workshop: RA5 Public attitudes to Bioviversity, Brussels, Belgium, 22-24 November.

Noémi Tóth

- 13th Meeting of the International Humic Substances Society (IHSS), Karlsruhe, Germany, 30 July - 4 August.

Katalin V.-Balogh

- 13th Meeting of the International Humic Substances Society (IHSS), Karlsruhe, Germany, 30 July - 4 August.

Ágnes Vehovszky

- 5th Forum of European Neuroscience (FENS 2006), Vienna, Austria, 8-12 July.

Lajos Vörös

- 13th Meeting of the International Humic Substances Society (IHSS), Karlsruhe, Germany, 30 July - 4 August.

- ALTER-Net Workshop: Assessing Biodiversity Trends in European Lakes, Edinburgh, Scotland, 17-18 October.

- Preparatory discussion of the Austro-Hungarian Inter-reg Project, Vienna, Austria, 9-10 November.

- University Babes-Bolyai, Cluj-Napoca, Romania, 16-18 November.

2007

Gábor Balog

- 31st Göttingen Neurobiology Conference, Göttingen, Germany, 29 March - 1 April.

Csilla Balogh

- 7th International Conference of the European Society for Ecological Economics, Leipzig, Germany, 4-8 June.

- Konstanz Limnolgical Research Institute, Konstanz, Germany, 25-29 June.

- 30th Congress of the International Association of Theoretical and Applied Limnology (SIL), Montreal, Canada, 12-18 August.

Bíró Péter

- IUBS General Assembly, Washington DC, USA, 9-13 May.

- Suez Canal University, South Vallex University, Alexandria University, Egypt, 20-27 May.

- 30th Congress of the International Association of Theoretical and Applied Limnology (SIL), Montreal, Canada, 12-18 August.

Gergely Boros

- Research visit at the University Jyväskylä, Finland, supported by the European Science Foundation, 22 October - 16 November.

Károly Elekes

- 8th Congress of the International Society of Neuroethology, Vancouver, Canada, 22-27 July.

Tibor Erős

- "Fish Stock Assessment Methods for Lakes and Reservoirs: Toward the True Picture of Fish Stock", Ceske Budejovice, Czech Republic, 11-15 September.

Mariann Gácsi

- 32nd FEBS Congress, Vienna, Austria, 7-12 July.

László G.-Tóth

- Biological Research Institute, Romanian Academy, Bucharest, Danube-Delta Research Institute, Tulcea, Romania, 29 June - 14 July.

- Estonian University of Life Sciences, Tartu, Estonia, 12-15 December.

Gyöngyi Kenesi

- IX European Society for Isotope Research Workshop (IX. ESIR), Cluj-Napoca, Romania, 23-28 June.

Arnold Móra

- The Macaulay Institue, Aberdeen, U.K., 12-19 May.

Zsolt Pirger

- University of Sussex, Brighton, U.K., 11 April - 11 June, 17 October - 1 November.

- SfN Conference, San Diego, USA, 3-7 November.

Gábor Paulovits

- 4th International Conference on Environmental Engineering and Management, Iasi, Romania, 12-15 September.

Mátyás Présing

- Suez Canal University, South Vallex University, Alexandria University, Egypt, 20-27 May.

- 30th Congress of the International Association of Theoretical and Applied Limnology (SIL), Montreal, Canada, 12-18 August.

Boglárka Somogyi

- International "Fluorescence in situ Hybridization (FISH)" Course, University of Vienna, Vienna, Austria, 19-23 February.

- "Lake Constance Training Course"; Living Lakes Eastern Europe Network, Radolfzell, Germany, 22-26 May.

- 30th Congress of the International Association of Theoretical and Applied Limnology (SIL), Montreal, Canada, 12-18 August.

Zoltán Serfőző

- 31st Göttingen Neurobiology Conference, Göttingen, Germany, 29 March - 1 April.

- 32nd FEBS Congress, Vienna, Austria, 7-12 July.

András Specziár

- "Fish Stock Assessment Methods for Lakes and Reservoirs: Toward the True Picture of Fish Stock", Ceske Budejovice, Czech Republic, 11-15 September.

Attila Szűcs

- Institute for Nonlinear Science, University of California, San Diego, USA, from 10 October continuously.

Péter Takács

- ECI XII (XII European Congress of Ichthyology), Cavtat (Dubrovnik), Croatia, 9-13 September.

István Tátrai

- Finnish Game and Fisheries Research Institute, Enonkoski, Finland, 29 September - 10 October.

Katalin V.-Balogh

- 30th Congress of the International Association of Theoretical and Applied Limnology (SIL), Montreal, Canada, 12-18 August.

Lajos Vörös

- ALTER-Net All-Parties Conference, Palma de Mallorca, Spain, 5-9 February.

- 30th Congress of the International Association of Theoretical and Applied Limnology (SIL), Montreal, Canada, 12-18 August.

András Zlinszky

- School of Conservation Biology of the Croatian Biological Society, Rovinj, Croatia, 21-29 June.

 

Conferences, symposia

Every year in October, the "Days of Hidrobiology" were held in the Institute, organized by the Hungarian Hydrological Society, the Regional Committee of HAS, Veszprém, and the Institute. (Organized by Péter Bíró)

Furthermore:

- 9th Conference of the Hungarian Neuroscience Society, Balatonfüred, 22-25 January 2003. (Organized by Károly Elekes)

- 10th ISIN Symposium on Invertebrate Neurobiology, Tihany, 5-9 July 2003. (Organized by Károly Elekes)

- "REBECCA WP Lakes and WFD Lakes GIG Meeting", Tihany, 26-27 September 2005. (Organized by László G.-Tóth)

- "Lakes Intercalibration within the EU Water Framework Directive", Tihany, 28-30 September 2005. (Organized by László G.-Tóth)

- IV. Conference on the Research of Macroscopic Aquatic Invertebrates, Tihany, 12-13 April 2007. (Organized by Arnold Móra)

- XIII. International Colloquium on Amphipoda Conference, Tihany, 20-25 May 2007. (Organized by Ilona B. Muskó)

- 11th ISIN Symposium on Invertebrate Neurobiology, Tihany, 25-29 August 2007. (Organized by Károly Elekes)

 

New research equipments

2003

Liquid scintillator, PerkinElmer Life Sciences

Microinjector, WPI

Intracellular amplifier, Neuroprobe Model 1600, A-M Systems Inc.

Vibration fill table, Supertech

Fiber optic cold light illuminator, Novaflex

Stereomicroscope, Leica m26

Hydroacustic equipment, Simrad AS

Microcentrifuge, Heraeus

HPLC thermostate, Waters

Laminal box, Aqua-Terra

Molecular biological laboratory:

PCR aut. T1 thermocycler, Biometra GmbH

UV illuminator table, Biocenter Kft

Blotting chamber, electrophoretic unit, Biocenter Kft

Notebook, 2 pcs

PC, 2 pcs

Nissan Van

2004

Stereo microscope, Alpha SMT 3231, Zeiss

Stereo microscope, SMZ 1000, Nikon

Amplifier, Axon

Vibration fill table, Supertech

GPS MAP 76C, Garmin

Binocular compound light microscope, Olympus

Binocular compound light microscope, Motic, Cole-Parmer (USA)

Drying oven, Heraeus

Fish Measuring Board-FMB, Limnoterra Co (Canada)

Microlightsensor, Heinz Walz GmbH

Notebook, 3 pcs

PC, 6 pcs

Xerox machine, Minolta, 2 pcs

2005

Microlightsensor, Heinz Walz GmbH

Ultrapore watersystem, Millipore Kft

Velocimeter, Meerestechnisches Büro Turla GmbH

Biostimulator, Supertech

Aquarium, Dept. Mechanical Engineering, Pannonian University

Laser printer, Konica Minolta, 4 pcs

PC, 10 pcs

Motor-car, Opel Astra Caravan

Snow-plow

Lawnmover, MTD Celebration

2006

Projector, Infocus X3 XGA

Transportable optical pH-meter, Hach HQ

Electrofisher, Hans Grassl GmbH, 2 db

Monitor, Beta/Gamma

Shaker, Bühler

Wave-generator, Dept. Mechanical Engineering, Pannonian University

Large scale turbulence generator, Dept. Mechanical Engineering, Pannonian University

Magnetic stirrer, Multipoint

Thermostate, Thermo Neslab

Global Water FP101 Flow Probe

Digital camera, Nikon 50D

Analytical cell, ESA Inc.

Notebook, 6 pcs

PC, 6 pcs

2007

Stereomicroscope, Alpha STO-4T, Elektro-Optika Ltd.

Stereomicroscope, National DC3-420T, National

Rotator, Kurt J. Lesker

Binocular compound microscope, Alpha XDS, Elektro-Optika Ltd.

Victor3TM plate reader and filters, Wallach-PerkinElmer Life and Analytical Sciences

Blotting chamber, Bio-Rad

Horiba U-10 Water Quality Checker, Horiba Co.

Water Quality Checker, Oakton 600, Kurt J. Lesker

Adjustable microscale turbulence generator, Dept. Mechanical Engineering, Pannonian University

Printer, HP Laserjet 2600 N

PC, 9 pcs

Renovations

2003 - Renewal of the electric wiring system of building A

2003 - Reconstruction and deepening of the pier bay

2004-2005 - Building up of natural gas heating for the Institute and the living houses

2005 - Renewal of the water supply of building A

2005 - Renewal of the electric wiring system of building B

2006 - Building up of the internet network in building B

2006 - Reconstuction of the central heating and vacuum system in building C

2006 - Renewal of the Balaton-water supply and compessed air system in building A (in progress)

2007 - Renovation of the Balaton-water supply system

2007 - Partial renovation of the apartment house "Villa Gombos"

***

In 2007, the library contained 5302 books and 8973 volumes of journals. In 2007, 14 Hungarian, 17 international journals and 2 electronic databases were subscribed.

 

Scientific results (2005-2007)

The Department of Hydrobotany studied:

  1. how changes in the waterlevel of Lake Balaton affect the biota of the Lake;
  2. the factors determining species composition, mass, genetics and production of phytoplankton and macrophyte populations;
  3. the photosynthetic activity of phytoplankton, phytobenthos and periphytic algae (with 14C radioactive isotopes), the composition, the biomass and the primary production of algal assemblages, the role of UV radiation as an inhibitor, the effects of sediment and dissolved humic substances, the allochthonous organic matter charge of the Lake;
  4. concentration and flow of different phosporus and nitrogen compounds in the lake water, and the speed of their absorption, the carbon and nitrogen content of planktonic and periphytic algae;
  5. the competition for nutrients between bacteria and algae;
  6. the speed of photolysis of organic matter in the Lake, determined the changes in phytoplankton atmospheric nitrogen fixation induced by eutrophication;
  7. the effect of ultraviolet radiation on dissolved organic substances in the water of lakes with different turbidity, trophism and organic carbon concentration;
  8. the possibilities of phytoplankton long-term monitoring in all four basins of Lake Balaton;
  9. the effect of changes in halobity on phytoplankton;
  10. the effect of water from Rába, Mura and Dráva on the biomass and composition of phytoplankton from Lake Balaton, the role of factors influencing phytobentos and phytoplankton;
  11. productivity and taxonomy of picoplankton from lakes and rivers in the whole country, as well as the effect of ultraviolet radiation in Hungarian lakes;
  12. photosynthesis and respiration of the five most abundant submerged macrophyte species in Lake Balaton; chromatic adaptation and morphology of macrophytes from different habitats in the Lake, furthermore, the sediment chemistry, biometrics and ecophysiological qualities of eight selected reed stands along transects and the rhizome, root and shoot consumption of herbivorous (macrophyte-eating) birds and fish;

The Departement of Hydrozoology studied:

  1. zooplankton (planktonic crustaceans), zoobenthos (zebra mussel, chironomid-larvae) and sessile microscopic invertebrates (Corophium curvispinum) as different groups of invertebrates, their distribution, population dynamics and food cycle;
  2. the effect of water level fluctuation and modelled biomass and function of the invertebrates living on underwater solid surfaces, as well as the effect of turbulence on zooplankton species distribution and function;
  3. cladoceran plankton dynamics as a function of waterlevel, and thereby of wave-effect, of concentration, of desiccation and of humidity on sessile and planktonic invertebrates;
  4. the complex zoobiological system of the Hévíz spring-lake; v) the fish and macroinvertebrate assemblages of small creeks in the Balaton catchment area (laying the basis for a long-term monitoring system);
  5. the faunistics of chironomids on the vegetation-covered shores of Lake Balaton, in the Outer and the Inner Lake, in small tributaries of Lake Balaton, with special attention to the prEN 15196 EU standard;
  6. the macrozoobenthos of Lake Balaton tributaries;
  7. the dynamics of the Lake´s fish populations
  8. the composition of the fauna and flora of biofilms on the shores of the Lake (biodiversity), the structure of invertebrate and vertebrate (fish) communities and monitoring of trophic links
  9. the changes in the feeding habits (feeding strategies, trophic interactions) of "indigenous" and introduced fishes in Lake Balton during ontogenesis and their influence on growth and on partitioning of the food-basis;
  10. with the help of hydroacoustics, the features of the ecological basis of fishing and angling;
  11. the fish population of the Lake regarding the methodology of the EU Water Framework Directive and instrumental detection of shoals of fish (with echo sounder), as well as tracking them in the Lake and in shallow waters of the watershed;
  12. the fish assemblages of the inflows and of the Kis-Balaton Water Protection Reservoir, their spatial and temporal dynamics;
  13. food chain and trophism interactions in shallow water ecosystems;
  14. the morphometry and the growth of different fish species in order to get to know the differences between the populations of the different Balaton-basins
  15. the changes in reproduction and spawning conditions resulting from water-level fluctuations
  16. the effect of environmental factors on the fish assemblages of Lake Balaton-tributaries and of the River Zala (faunistic data).

The Department of Experimental Zoology focused its research in the field of comparative neurobiology and in the field of neuro- and ecotoxicology in the following issues:

  1. Role of monoamines (serotonin [5-HT], dopamine, octopamine, histamine) and some peptides (PACAP), their metabolites and second messengers in neuronal regulation and in different embryonic and postembryonic developmental processes;
  2. Neuronal and modulatory control of pattern generation, synchronization and motor coordination in central neuronal networks involved in different behaviors, including feeding, locomotion and respiration;
  3. Neuronal control of salivation at membrane levels, and its molecular background mechanisms, as well as the events of apoptosis triggered by neurotransmitters and neuromodulators;
  4. Identification and localization of extracellular matrix components (proteoglycans and glycoproteins) and their functional significance in adult and embryonic neuronal tissues;
  5. Central and peripheral connections of the gravireception -locomotorion reflex arch;
  6. Analysis of both short term and long lasting functional changes and the activity-dependent reorganization in model neural networks and in vitro (tissue culture). Mathematical modeling of the spontaneous electrical activity and its plastic changes in individual neurons;
  7. Identification and charaterization of active membrane components (persistent type of Na+ channels) involved in memory formation processes of the nerve cells and neuronal networks;
  8. Monoaminergic processes involved in immune responses, with special attention to the aminergic receptors and its metabolic enzyme systems in heamocytes.
  9. Toxic (behavioral) effects of environmentally significant substances of both biological and synthetic origin, including cyanotoxins, insecticides and dopaminergic neurotoxins, and their cellular and molecular mechanisms in model invertebrates and in vitro (tissue culture).
  10. Bioaccumulation, biotransformation and elimination mechanisms of polycylic aromatic carbohydrates (e.g. phenantrenes, fluorathenes and pyrens) in aquatic invertebrates (amphipods, bivalves).

 

Results of hydrobotanical research

Phycological research. Within this project, the entire algal population was assessed, in 2005, for the first time in the research history of Lake Balaton: not only the biomass of pelagic algae was determined, but also of benthic algae (phytobenthos), of algae growing on shore-stones and on reed stalks (periphyton). It was shown that phytoplankton (45-78%) and phytobenthos (21-54%) constituted the overwhelming majority of the entire algal population, the algae living on reed and on shore-stones made up only 0.3-1.4%. It was established that the growth of phytobenthos and reed-periphyton is regulated by underwater light climate.

Long-term data of the BLRI was analyzed and it was proved, that there is no significant connection between waterlevel and phytoplankton biomass. The phosphorus uptake of planktonic algae assemblages was explored. The concentration of chlorophyll-a, dissolved reactive phosphorus, total dissolved phosphorus and total particulate phosphorus was chemically determined, the photosynthesic activity of phytoplankton measured, heterotrophic nanoflagellates identified, the abundance of different sized algae and bacteria determined.

The actual concentration of orthophosphate in Balaton lakewater was calculated based on 32PO4 uptake experiments. It was shown, that its concentration is not even 1% of that measured with conventional chemical methods. This very low level of orthophosphate proves that this is the factor which limits phytoplankton growth in Lake Balaton.

The nitrogen metabolism of the filamentous nitrogen fixing bluegreen algae Cylindrospermopsis raciborskii, which occurrs in masses in Lake Balaton in the summer, is poorly known under phosphorus limited conditions as is typical for natural lakes. Thus a research series investigated in flow-through algae cultures how the form of the available nitrogen (ammonia or nitrate) influences their reproduction under phosphorus limitation and how far these inhibit atmospheric nitrogen fixation. It was shown that none of the nitrogen forms dissolved in water stopped nitrogen fixation completely. In the presence of nitrate and at high through-flow (growth) rates very high chlorophyll concentrations were measured - even higher than in the cultures supplied with ammonia. This was attributed to the growth of the photosynthetic apparatus, which is needed for the reduction of nitrate.

In the year 2006 there was an important and positive change for the quality of the lakewater, as no outbreak of nitrogen fixing bluegreen algae took place in the Siófok basin for the first time since 1960.

The lake´s phytobenthos was also investigated, the diurnal pattern of its vertical distribution was shown. The effect of light and nutrients (N and P) on the vertical migration of phytobenthos was investigated under laboratory conditions. It was shown that the vertical migration of benthic diatome species in the sediment is positive phototactic during day time, and positive chemotactic in the night. According to the results, benthic diatomes take limiting minerals from the interstitial water of deeper layers in the sediment.

Primary production of phytoplankton and phytobenthos was measured in all four asins of the Lake using 14C and O2 techniques with stable isotope techniques (15N) the speed of ammonia, carbamide and nitrate uptake and of atmospheric nitrate fixation was measured in the Siófok and Keszthely basins in photosynthetrons.

The biomass of phytoplankton, phytobenthos and periphyton was calculated for different water level scenarios. It could be stated that up to a waterlevel fall to 110 cm (measured at Siófok standard waterlevel) there would not be any serious rearrangement of the lake´s algal flora.

Investigating the phosphorus flow of microbial plankton with the help of dyalisis and isotope techniques, it could be established that the concentration of dissolved orthophosphate in the lake water is around 1 nM, which is two orders of magnitued less than shown by chemical analyses. Algae and bacteria are able to take up phosphorus, which is a macronutrient, in as small concentrations as it was only known from micronutrients before. The role of bacteria was earlier thought to be mainly in decomposing organic matter and regenerate phosphorus this way, now they were shown to take up about the same amount of phosphate as algae.

Pikoplankton. In recent years, the research on photoautotrophic picoplankton gained new momentum in the BLRI, thus research was extended to Lake Fertő and the area between the rivers Danube and Tisza, and even to Voivodinian alkaline lakes in 2005 (altogether 9 lakes were studied). For the first time the dominance of pikoplantkon in white water alkaline lakes was shown. According to seasonal investigations, in the winter it was the eukaryotes, from all picoplankton, and in the spring the cyanobacteria that dominated in every waterbody studied. The underwater light climate was determined, with the help of which an empiric relationship could be established between the Zmix/Zeu coefficient and phytoplankton biomass. The photosynthetic activity of phytoplankton was measured with 14C method and this way proved that the picoplankton´s part of the lake´s total primary production is also very important in Lake Balaton. Further it could be shown, that the percentage of picoplankton in total primary production rises with decreasing trophism along the longitudinal axis of the Lake from the westernmost basin (Keszthely) to the easternmost (Siófok) (Keszthely basin: 23%, Szigliget basin: 35%, Szemes basin: 37%, Siófoki basin: 54%). For revealing the picoplankton´s diversity, molecular methods were used. With DGGE (denaturing gradient gel electrophoresis) it could be shown, that among the most closely related to the identified sequences from the studied lakes were isolates/enviromental clones from fresh water as well as from the sea or from brackish water, so from the Israeli Lake Kinneret, from oligo-mesotrophic subalpine lakes, from far-eastern fresh and ocean waters, from the Mediterreanean Sea as well as from the Baltic Sea. The results suggest that the algal composition of the Hungarian white-water alkaline lakes is very special and unique in the world literature. This adds a further value to their already known chemical and biological characteristics and represents one further point for their protection.

Dissolved and organic matter flow

The ecological role of dissolved organic (humic) substances might gain even more importance considering climate change (warming up, enhanced radiation, enhanced residence time), however, not even its present role in aquatic systems, such as Lake Balaton is sufficiently known. For this reason from January till September 2005 the total organic carbon (TOC), dissolved organic carbon (DOC) and colour concentration (Pt units) were measured at the mouth of 7 tributaries of Lake Balaton monthly. The DOC concentration of non-humic (NHS) and humic (HS) substances was measured, the biologically available dissolved organic carbon (BDOC) content and breakdown rate were determined. The available proportion was 39% of total DOC in the Tapolca creek and only 7% in the Imremajor channel, lowest in the Egerviz, the half-life was 2.1 and 5.4 days, respectively. There was an inverse relationship between DOC concentration and colour concentration due to organic matter, the percentage of humic substances in DOC as well as the ratio of its biologically available part. These results contribute to the knowledge of the allochtonous organic matter load on Lake Balaton and the role of organic matter in the carboncyle.

The load of particulate (POC), dissolved (DOC) and biodegradable dissolved organic carbon (BDOC) in the seven most important tributaries of Lake Balaton were calculated for the year 2005. Based on this, the total load of allochtonous organic matter on Lake Balaton was calculated. The total load of POC was 600 t/a in 2005. The DOC load was by an order of magnitude bigger (7000 t/a) than the POC. The lake´s BDOC load was 500 t/a, the half of which (257 t/a) were attributed to the River Zala. The yearly average DOC concentration at the mouth of the Zala was almost twice as high in 2005 than in 1988 (increased from 9,5±2,62 mg l-1 to 16,7±4,21 mg l-1). Analyzing long-term date, it could be proved that during draughty perdiods less organic matter gets solved and washed out in the watershed than during rainy periods. In the four basins of Lake Balaton, the concentration, the breakdown rate and the half-life of biodegradable dissolved organic carbon (BDOC) was determined. BDOC constitutes 4-9 % of DOC in the Lake. The breakdown rate of BDOC decreases along the longitudinal axis of the Lake from west to east from 0.254/day to 0.136/day, its half-life increased from 2.73 days to 5.11 days.

Research on macrophytes in Lake Balaton

Reed die-back in Lake Balaton can only be halted and reedstands rehabilitated if the main reason of die-back is identified and eliminated. This aim is also set as a task in governmental resolutions. Previous results suggested that the reason might be found in the waterlevel set earlier at a level too high for reed.

In summer 2000 a four-year period of draught began. This can be seen as an experiment conducted by nature, which was evaluated by comparing airial photographs taken of reeds in 2000 and 2003. Already a direct comparison shows that the state of the reeds improved. In some places homogenous stands developed where there had been only heterogenous reed bundles before, in other places the front of homogenous reedstands moved further into the water. The improvement was calculated in terms of area based on maps. The results show that the low water has reversed the process of die-back. This suggests that the die-back itself was caused by enhancing the regulated low-waterlevel from +40 cm to +70 cm in 1970 and stabilizing the mean-waterlevel at 70-100 cm. However, the reed plants require natural water level fluctuations, including periodically low water.

In the Siófok basin the seasonal dependence of the respiration and the photosynthesis of two of the dominant submerged macrophytes were investigated. According to the results, intensity of both respiration and maximum photosynthesis increase with temperature between 12-26°C. At lower temperatures maximum photosynthesis was reached at lower light intensities and the light compensation point was lower. This suggests that less light is sufficient for the growth of macrophytes in colder water.

Light and temperature dependence of the photosynthesis of the four most common macrophytes (Potamogeron perfoliatus, Myriophyllum spicatum, Najas marina, Ceratophyllum demersum) in Lake Balaton was determined. It showed that Myriophyllum spicatum and Potamogeton perfoliatus have the best light efficiency in spring, while the temperature and light optima of Ceratophyllum demersum and Najas marina resemble most conditions found in the summer.

Regarding interactions between macrophytes and herbivorous waterfowl, it was experimentally established that it is mostly waterfowl that consumes submerged macrophytes in Lake Balaton.

The changes of reed stands in Lake Balaton were observed on airial photographs. According to the results, stands moved on average 36 m towards the open water between 1951 and 1982, but receded 20 m on average between 1982 and 2000. The regulated low-water level of Lake Balaton was raised in 1977 from +40 cm to +70 cm. It was shown that in the preceding period, when low waterlevels occurred frequently, reed advanced quickly. Between 1977 and 2000, when waterlevel was artificially stabilized at a high level, reed died back. Thus it was concluded that reed requires lower water from time to time, when waves can wash out organic mattter accumulated at the foot of the reed stands and the sediment can be aired. According to the results, these conditions can only be fulfilled when the environmental needs of reed are taken into account in water regulation.

Reedstands of the northern and the southern shores can be seperated by comparing them genetically. Investigations on reed zonation showed genetic differences between reed on the waterside and on the landside. This might be explained by the different times from which on reed started to grow in these places. Genetic diversity was as high in deep water as in shallow water, which suggests that ecological plasticity of clones is high.

In 2007, the majority of the research at the Department of Hydrobotany was conducted within the NKFP 3B022-04 BALÖKO project "The effect of changes in waterlevel on the ecological state of Lake Balaton". Research included the ecological effect of allochtonous organic matter. In the course of this research, the photolytic breakdown rate of dissolved organic matter in the lake water was determined. The results prove on the one hand that it is because of photolysis that the concentration of dissolved organic carbon, which is discharged by the River Zala, decreases dramatically, on the other hand, that as a result of this process, organic matter becomes more and more persistent to breakdown, even to photolysis, during its residence in the Lake. Furthermore, subsidized by OTKA (OTKA K 63296), the role of ultraviolet radiation in the transformation and degradation of dissolved organic substances in lakes was investigated.

Within the NKFP 3B022_04 BALÖKO project the phosphorus uptake of algae was studied. According to the results, phosphate uptake of phytobenthos and Cladophora was 2-3 magnitudes of order slower in non-enriched water than of phytoplankton. This shows that these organisms do not have a phosphate uptake system with similar affinity as planktonic mircoorganisms have. Benthic algae satisfy their phosphorus needs from interstitial water during their diurnal vertical migration, another source of locally high concentrations can be phosphorus resolved from sediment mixed up by waves.

During the investigations on the N-flow of Lake Balaton N2 fixation was compared in Keszthely, Szigliget, Szemes and Siófok basins at different times, different stages of the algal bloom of N2 fixing cyanobacteria. N2 fixation of phytoplankton was still significant in September and in Szigliget and Keszthely basins at the end of September remarkable amounts were still fixed. In short-term experiments it was established that Fe3+ EDTA did not enhance N2 fixation, while PO43- did so only to a small degree. Enrichment with NH4+ inhibited N2 fixation in all cases, even in experiments conducted while the algal peak collapsed. Nitrogen uptake of periphytic algae was examined using stable isotope techniques (15N). It was stated that N-uptake of periphyton on reed and on stones at different waterlevels is mainly determined by the size of the surface underwater. The greatest N-uptake possible of reed and stone periphyton is together still by several orders of magnitude less than N-uptake of the lake´s phytoplankton.

Total production of phytoplankton in the Lake in the summer reached during the most productive periods 600 t C/day (calculated from data from 2006-2007), the production of periphyton on reed and stones was not significant regarding the whole lake. The production of benthic algae was almost 2 orders of magnitude higher than of periphytic algae on stony littorals as well as on reed stalks. It was shown that a decrease of the waterlevel does not influence the production of phytoplankton significantly. The production of reed and stone periphyton is highest at a waterlevel of 110 cm (reed periphyton 4.1 t C/day; stone periphyton 4.7 t C/cay) and decreases as waterlevel falls proportionally to the amount of surfaces getting above water. Phytobenthos production is not significantly influenced by decreasing waterlevels, it produces about 100-150 t C/day in the summer.

Changes in reedstands were followed on airial photographs. It was shown that reed receded in most places at about 50 m between 1975 and 2000, but in some places even 100 m. On the southern shore there was no die-back during this time, on the contrary, reedstands advanced further into the water. Thus, these new results support that the reason for reed die-back was the waterlevel raised and stabilized in the 1970-ies. During the period of low water in Lake Balaton (between 2000 and 2003) the area covered with reed incresed. The low waterlevel was first of all beneficial for the lake´s sediments as it enhanced their airation.

Comparing reedstands genetically, it was found that stalks 15-20 m apart showed only in very few cases differences in variable markers exceeding 95 % similarity, which means that reed clone size is generally smaller than this in Lake Balaton. This contrasts findings of the EUREED project, where clone size in the studied lakes reached even 500 m. It was established that the area of clones in Lake Balaton is smaller than 16 m2.

Photosynthetic activity of the four most common macrophytes (P. perfoliatus, M. spicatum, Najas marina and Ceratophyllum demersum) in Lake Balaton was examined. It was shown that according to maximum photosynthesis values, M. spicatum is the most active rooted macrophyte, followed by P. perfoliatus. According to the measuremments M.m spicatum and P. perfoliatus have the best light efficiency in spring, while the temperature and light optima of C. demersum and N.s marina resemble most conditions found in summer.

Regarding the interactions between macrophytes and herbivorous waterfowl, it was experimentally established that it is mostly waterfowl that consumes submerged macrophytes in Lake Balaton. On the northern shore it was first of all mallard duck (Anas platyrhynchos) which ate macrophytes. Consumption was remarkable mainly in the second half of the vegetation period, and especially the abundance of P. perfoliatus and M. spicatum decreased.

 

Results of hydrozoological research

Research on zooplankton

The extension of the shore-areas and the dependence of its size on waterlevel were calculated. According to the results, the area of the stony shores is 1.6 km2 at maximum waterlevel, decreasing 0.016 km2 cm-1 if waterlevel fell, reedy areas are 17.5 km2, decreasing 0.1 km2 cm-1, concrete walls are 0.072 km2, decreasing 0.00023 km2 cm-1, poles are 0.042 km2, decreasing 0.00027 km2 cm-1. The turbulence in the different layers of the watercolumn was measured with a 3D acoustic Doppler velocimeter from the top of the watercolumn every 20-50 cm downwards in the middle of the Siófok, Szigliget and Keszthely basins 12 times, and at Tihany in the reedstand, 2-3 m in front of the reed and at about 100 m from the reed towards the open water at 3-5 points 20 times (on altogether 32 days). Transparency, temperature, pH, conductivity and dissolved oxygene content were measured for each water layer and wind velocity. Based on 248 data points, the turbulence of Lake Balaton was between 0.6 and 13.65 cm sec-1, depending on the weather conditions, the place and the depth.

Biofilms of the littoral zone

Dry mass of the epilithon was significantly lower in 2005 than in the previous years, and was only at two sites higher than in 2004. The value for the summer samples of 2004 (235 g/m2) decreased further (145 g/m2). The number of taxa in the biofilm samples taken from four reedstands in Lake Balaton was the highest in the Keszthely basin (19) and the lowest in the Szigliget basin. The individual-numbers of epiphytic samples was also higher in the Keszthely basin than in samples from any of the three other basins. The decrease in individual numbers of zebra mussel (Dreissena polymorpha Pallas) and freshwater sponge (Spongilla lacustris L.) among the epilithic animals did not continue. The number of taxa was lower than in previous years. A higher individual number compared to other samples and the highest biodiversity value (1.825) was obtained for samples from the Fűzfő basin. The density of the tube-building amphipode Chelicorophium curvispinum showed a characteristic vertical pattern with 402 to 7401 (ind m-2) close to the surface and between 5811 and 34453 in lower layers. The density of Dikerogammarus species (with D. villosus dominant, next to D. haemobaphes, and seldom also D. bispinosus) was between 370 and 5993 in the upper layers, and between 417 and 10290 in the lower layers, and increased from May to July. The density of the zebra mussel (Dreissena poyimorpha) was between 0 and 17869 at the upper layers, whereas it was between 8094 and 93955 in the lower layers. The density calculated for the whole lake showed a similar pattern, with values of 1176 to 97300 for Chelicorophium, 1090 to 36389 for Dikerogammarus species and for the zebra mussel 0 to 352557.

A three-year period of data collection aiming at the quantitative relations of the zebra mussel on the stony littoral zone of Lake Balaton was completed and summarized. In the years 2003 to 2005, the density of the mussel varied between 0 and 93955 ind m-2 on stony surfaces, its biomass between 0 and 714 g m-2 (dry mass with shells), the average length between 0.9 and 10.7 mm, its relative abundance between 0 and 87%. The relative abundance of the zebra mussel declined radically in 2004, the spread of Chelicorophium curvispinum could be observed at this time. In 2005, the density of the zebra mussel grew significantly (p < 0.05), just as its biomass. The content of algae in the lakewater showed significant correlation with the amount of algae excreted by the mussels.

Reed samples were taken at Keszthely, Szigliget, Tihany and Balatonalmádi. The majority of the animals constituting the biofilm on reed stalks were ponto-caspian invasive species (Chelicorophium, zebra mussel and Dikerogammarus species) and Chironomidae (51.33-79.66%, in May, 76.41-98.17% in July). In May Chelicorophium dominated (14.18-45.13%), but in July the zebra mussel (28.11-73.12%), which can be attributed to the newly settled zebra mussel larvae. At Keszthely, there were mainly amphipods, in May as well as in July (55.64 and 63.96%), at Balatonalmádi mainly zebra mussels (28.85 and 73.02 %). At Szigliget and Tihany species dominance changed from May to July. The total densities (individual m-2 reed) varied in May between 16780 and 42308, and increased remarkably until July, to 30768 to 379862.

The biological research on the spring lake of Hévíz was continued, with the investigation of animal assemblages in the biofilm of 5 wooden or concrete pillars (zoomonitoring). The total number of taxa was 12 in the time period between 19 July 2005 to 23 Ferbruary 2006, which means a decrease by 40% compared to earlier periods. The values of the nematode/copepod ratio deteriorated further. These facts point at the increasing pollution of the lake.

Fauna of the tributaries

Research in the year 2005 was conducted on aquatic macroscopic invertebrate assemblages of Lake Balaton and on its small tributaries. From the 24 researched waterbodies 111 aquatic macroscopic invertebrates were recorded (Gastropoda 31, Bivalvia 11, Hirudinea 19, Malacostraca 11, Ephemeroptera 14, Odonata 19, Plecoptera 2, Heteroptera 20). Macroinvertebrate assemblages adapted to clear waters and the conditions in swamps (e.g. Planorbis carinatus, Stagnicola palustris, Anisus vorticulus, Bithynia leachii, B. troschelii, Gyraulus crista, G. laevis, Hippeutis complanatus, Alboglossiphonia hyalina, Glossiphonia concolor, Dina apathyi, Niphargus mediodanubialis) can nowadays only be found in strictly protected refuges and smaller reedstands in close to natural conditions.

In contrast to this, species spreading on the artificial stony shores (Potamopyrgus antipodarum, Physella acuta, Dreissena polymorpha, Jaera istri, Limnomysis benedeni) populated further areas and increased. The composition of the snail fauna is determined by large populations of rare species which are sensitive to water pollution (Valvata cristata, Planorbis carinatus, Anisus vorticulus, Bithynia leachii, B. troschelii, Physa fontinalis, Gyraulus crista, G. laevis, Hippeutis complanatus), thus indicating clean water. On highly altered shores there are rather populations of species preferring stagnant waters (Bithynia tentaculata, Radix auricularia, R. balthica, Lymnaea stagnalis, Planorbarius corneus, Physella acuta, Bathyomphalus contortus) which are characteristic. The bivalve fauna of the lake is diverse (Unio tumidus, U. pictorum, Anodonta anatina, A. cygnea, Pseudanodonta complanata, Dreissena polymorpha, Sphaerium corneum, Pisidium amnicum, P. supinum) due to the lake´s hydroecological qualities.

The leech fauna is very rich, several species which are rare and sporadic in the country could be detected in the Lake. The frequency of fish leeches (Piscicola geometra, P. haranti, P. pojmanskae) can be explained by the abundant fish quantities. The abundance of species from the ectoparasitic Glossiphoniidae family can be attributed to large populations of molluscs and amphibians. Predatory species can feed on lower animals living abundantly on the sediment surface. Several species (Glossiohonia paludosa, Placobdella costata, Alboglossiphonia hyalina, Batracobdelloides moogi, Erpobdella testacea, Dina apathyi) were found which are rare in Hungary and also in Europe. Finding them is of biogeographical as well as of ecofaunistic importance. In sheltered bays populations of the waterslater Asellus aquaticus are characteristic. Due to the swampy conditions developing around inflowing small creeks, populations of Niphargus mediodanubialis, Synurella ambulans and Orchestia cavimana can establish. Characteristic species found at the studied sections: Radix labiata, Pisidium amnicum, Glossiphonia nebulosa, Erpobdella vilnensis, G. roeselii, Coenagrion ornatum, Libellula fulva, Orthetrum brunneum brunneum, Aphelocheirus aestivalis, Velia caprai, Gerris asper. Few specimens were recorded of species characteristic for mountain creeks with rough bed material: Gammarus fossarum, Calopteryx virgo. At the lower reaches of the small watercourses common, euryoecious species (Potamopyrgus antipodarum, Radix balthica, Glossiphonia complanata, Erpobdella octaculata, Asellus aquaticus, Ilyocoris cimicoides, Plea minutissima, Gerris argentatus) with highly abundant populations dominated.

In 2006 macroscopic aquatic invertebrates (mayflies, dragonflies and damselflies, stoneflies, aquatic and water-surface heteropterans, aquatic beetles, caddis flies, chironomids) were collected on 61 sites in 27 small watercourses around Lake Balaton (18 on the northern shore, 9 on the southern), parallel to the fish stock surveys. In the course of the investigations, 978 larvae and 1106 exuvia, altogether 2084 specimens were identified. The occurrence of 109 species (14 Tanypodinae, 1 Diamesinae, 2 Prodiamesinae, 34 Orthocladiinae, 58 Chironominae) from 5 subfamilies was proved. 88 species were identified based on their exuvia, 63 on their larvae, 45 species only by their exuvia, 19 species were found only as larvae. 8 species were new to the fauna of Hungary: Diamesa tonsa, Cricotopus tricinctus, Orthocladius thienemanni, Orthocladius oblidens, Psectrocladius limbatellus, Parachironomus vitiosus, Polypedilum albicorne, Tanytarsus usmaensis. Among the reported species there are several which are under protection in Hungary: Agrion virgo, Coenagrion ornatum, Gomphus vulgatissimus, Anaciaeshna isosceles, Libellula fulva, Orthetrum brunneum. The different waterbodies were classified using cluster-analysis.

Studies on the fish populations of Lake Balaton and its watershed

In the year 2005, 6 008 individuals of 25 fish species were collected in different habitats of the shore area (from each place 4-13 species, 43-672 individuals). In the open-water habitats of the littoral bleak (11,3-83,7%) and roach (2,7-30%) were dominant. In the northeastern basin the percentage of bream (23,2-25,4%) and white bream (15,6-16,3%) increased. In the reed-stands it was also the bleak (51,4-84,6%) and the carp (7,1-38,1%) which were the most frequent species, but in the Kerekedi Bay in the summer roach (55,8%) and carp (20,9%) dominated. The species composition of the stony littorals was very different. At Tihany bleak (29,3-56,7%) and monkey goby (29,9-36,2%) were frequent, at Keszthely and Balatonfüred the pumpkinseed (37,5-47,8%). In sheltered ports, pumpkinseed (7,8-40,1%), bleak (1,2-39,1%) and bodorka (8,7-39%) were characteristic. On the southern coast of the northeastern basin (at Siófok), it was crucian carp and bitterling which occurred abundantly. The fish population of the Lake is strongly influenced by anthropogenic activity. Apart from the presence of bighead carp - which could be displace from the Lake - it is the pelagic zone which has the most natural species composition.

Introduced species find mainly in the littoral zone favourable conditions, where species displaced from the lake, now disappeared, rare and protected, used to live. The high proportion of alien species and the negative patterns in the population structures of certain native species prove that the fish fauna of Lake Balaton is heavily distorted. The amount of pikeperch fry from natural sources exceeded in May the amount of 13307 individual/ha, which means 800 million pikeperch fries for the whole lake. Thus the amount of pre-raised juveniles released into the Lake makes up not even 0.2% of the natural progeny, and is therefore of no importance regarding the supply of the population. The amount of juveniles decreases to 10-30 individual/ha until the autumn. For effectively supporting the pikeperch population of Lake Balaton it would be necessary to release 100-200 thousand big, one year old juveniles.

From the Inner Lake of Tihany, 15 fish species were reported. Here the density of fish populations is strongly dependent on anglers´ catches and fish releases. The complete fish biomass of the lake was assessed to be 720-970 kg/ha between 2001 and September 2003. Among this, 222-482 kg/ha were carps, 38-486 kg/ha breams, 92-412 kg/ha crucian carps, 8-37 kg/ha roaches, 1-9 kg/ha bleaks, 0-42 kg/ha pikeperches, 0-10 kg/ha wells, and 0-4 kg/ha asps. In smaller amounts there were also silver carps and grass carps.

Size dependent processes in the feeding habits of the more frequent fishes of Lake Balaton were analyzed. Altogether the food of 15 fish species and the growth of 8 fish species were investigated. Roach feed on a variety of foods and show tendentious changes as they grow. Rudd eat at the beginning animal food, planktonic crustaceans, chironomid larvae, pupa and insects falling onto the water surface, than feed on periphytic diatomes and green algae, and at last, reaching a body length of 60-70 mm, they convert gradually to eating submerged macrophytes, which is the main food of mature specimens. The first-year-juveniles of asp feed first on zooplankton, later (above 20 mm) on insects fallen on the watersurface - mainly chironomids - then, from the second year on, they also consume fish occasionally. Reaching 120-150 mm of body length, asps eat almost exclusively fish. The feeding habits of young white bream are similar to those of bream. The food of bream changes from planktonic crustaceans towards benthic fauna. The food of razor fish, in the investigated size interval, consists to a decisive degree of planktonic crustaceans, parallel to the animals´ growth it is more and more Leptodora kindtii which becomes the main food source. Occasional consumption of fish fry can be observed from the size of 100 mm on.

The crucian carp uses three different food sources above all in Lake Balaton: zooplankton, diatomes and detritus. The main food of carps is zebra mussels. Apart from this, chironomid larvae and detritus are also part of their diet in smaller proportions. For bigger specimens above 500-600 mm, which live in the reeds, rough plant debris and the seeds of aquatic plants, especially of reed, play a rather important role. The food of 1+ and older pikeperches at the size of 100-400 mm consists characteristically of ruffe and to a smaller amount of bleak, whereas for the food of bigger specimens (500-800 mm) it is more and more adult bream and razor fish which is typical, according to the results. Cannibalism can already be observed from the size of 15 mm on and remains in older age groups too, to 5-10%. In the food of Volga pikeperch at the size of 100-150 mm zooplankton organisms did hardly occur anymore. Exceeding the size of 150 mm the Volga pikeperch feeds almost exclusively on fish. Cannibalism was of great significance, as 20 % of the consumed fish was 0+ and 1+ aged Volga pikeperch. Data obtained up to now on the feeding habits of monkey goby show that specimens above 20 mm consume mainly chironomid larvae and as they grow, amphipods gain importance in their nutrition.

The morphometric traits and differences in growth of the bleak populations in the two basins furthest apart in Lake Balaton were clarified. In the two basins of different water quality the diametre of the eyes and the size of certain fins differed. Altogether 32 meristic patterns were analyzed using discriminant analysis and thus the divergence between the two areas was shown. According to the research on growth, the growth of bleak slowed down parallelly to the improving of water quality and nowadays does not reflect anymore the trophic gradient along the longitudinal axis of the lake. This is obviously due to a change in feeding habits.

Based on the EU Water Framework Directive (EN 14757/2005), a method was determined, how to assess the fish population of lakes with gillnet sampling and in the frame of the ECOSURV project suggestions were made referring to the standardized methods and procedures. During the research, 8904 specimens (342 kg) of 14 species were caught. On tributaries of the northern and the southern shores of the Lake altogether 62 sites were sampled for fish faunistic surveys and macrozoobenthic assays.

In that year the size distribution of the released bighead carps, their abundance, biomass and distribution in the two basins of the lake was surveyed with hydroacoustic methods in May and June. The mass of the bighead carp population of Lake Balaton and its spatial and temporal distribution was assessed. The BH ZRt was advised a more efficient technology for fishing bighead carp. The bighead carp catch was of about the same amount in 2006 as in the previous year, 244 tons. It could be stated that the bighead carp population of the Lake did not decline within this period. The Eastern Basin contributed more than 70% of the annual catch, which is in consistency with the findings obtained with instrumental methods. The production rate of the bighead carp in Lake Balaton was highest in the 8-9 year old group, it reached 2-3 kg yearly. The P/B ratio decreased steeply with age. The P/B ratio of bighead carp older than 11 years was only < 10%.

Food research, food webs

Size dependent processes in the feeding habits of 15 fish species and the growth of 8 fish species of Lake Balaton were analyzed. Special attention was payed to the early developmental stages, the procedures taking place at juvenile age. According to cluster and principal component analysis, the food of ruffe, perch and pumpkinseed differs conceivably; there is no strong food competition between them. Roach feed on a variety of foods and show tendentious changes as they grow. The food of bream changes from planktonic crustaceans towards benthic fauna. The food of Volga pikeperch sized 6-25 mm consisted of tiny copepods and cladocerans. At the size of 25-50 mm (this size group occurrs only from June to August) the Volga pikeperch fed mainly (46-57%) on Cyclopidae species and on chironomid larvae, especially on larvae of Procladius choreus (21-24%). At the size of 50-100 mm the Volga pikeperch consumed first of all chironomid larvae (1-52%), the crustacean Limnomysis benedeni (9-64%) and at a decreasing proportion copepods (9-32%). At the size of 100-150 mm zooplankton organisms did hardly occur anymore in their food.

The Volga pikeperch ate at this time chironomid larvae, primarily larvae of P. choreus (0-62%) and bigger crustaceans, among which Limnomysis benedeni (0-47%), Leptodora kindtii (0-14%), Corophium curvispinum and Dikerogammarus spp. occurred in larger proportions. It was also at this size, that fish was eaten for the first time (19-100%). Exceeding the size of 150 mm the Volga pikeperch feeds almost exclusively on fish. Cannibalism was of great significance, as 20% of the consumed fish was 0+ and 1+ aged Volga pikeperch. The white bream specimens of 140-250 mm fed on an extraordinary great variety of foods consisting of zebra mussel, Chorophium, filamentous algae and numerous other animals. Zooplankton and plant debris constituted to different parts the food of crucian carp between 150 and 350 mm. For carps between 250-700 mm the main food source are zebra mussels, detritus, chironomid larvae, and to a smaller amount, the food scattered by anglers into the water. Specimens of razor fish between 200 amd 300 mm feed mainly on the water flea Leptodora kindtii.

The first year juveniles of asp feed first on zooplankton, later (above 20 mm) on insects fallen on the watersurface - mainly chironomids - then, from the second year on, they also consume fish occasionally - especially pumpkinseed. The food of 1+ and older pikeperch at the size of 100-400 mm consists characteristically of ruffe and to a smaller amount of bleak, whereas for the food of bigger specimens (500-800 mm) it is more and more mature bream and razor fish which is typical, according to the results.

Dynamics of fish populations and food chain - trophic interactions were analyzed in KBWPR I -II. In the Lakes Hídvég and Fenék specimens of 20 fish species were found. Mudminnow and weather fish were only found in Lake Fenék. On the Radai reservoir 79% of the collected specimens were zooplanktivorous (785 individual/ha), 17% were benthivorous and 4% predatory fish. In the Kányavár Reservoir 49% were zooplanktivorous (930 individual/ha). The ratio of benthivors was 14%, of predatory fish 4%. The part of zooplanktivors of the whole biomass was 92 kg/ha, of benthivors (45 %) 155 kg/ha, while of predators it was (19%) 61 kg/ha. The total calculated biomass of zooplanktivors is 124 kg/ha, that of benthivors 87 kg/ha and of predators about 28 kg/ha. In the Radai reservoir of Lake Hídvég the percentage of crucian carp decreased, the biomass of benthivorous fish (carp, bream) developed similarly as in the year before, the assessed fish biomass was at 234 kg/ha.

On Lake Major of the Kis-Balaton Water Protection Reservoir (KBWPR) the structure and seasonal dynamics of phyto- and zooplankton were examined monthly. The significant coverage with macrophytes (> 80%) correlated with the decline in filtering cladoceran abundances. The filtration rate of 4% of the crustacean plankton is insignificant. Diurnal activity and feeding patterns of predatory fish (pike and wels) and of carp fish (carp, bream, crucian carp) were measured, with radio telemetric methods. The studied fish species segregate; in line with their feeding ecology, their habitat usage and activity is different.

In 2007, the Departement of Hydrozoology conducted its research also based on the "BALÖKO" NKFP project as well as on OTKA funded topics. The turbulence of Lake Balaton is characterized by 3.5 cm/sec average velocity in a range of 0.5-20 cm/sec. Increasing turbulence first affects the spatial structure of cladocerans, than of calanoids and at last of cyclopoids above vlaues of 6 cm/sec. In permanently turbulent water of > 3.5 cm/sec turbulence values, cladocerans die within 2-3 days, calanoids in 8-10 days, but the survival of nauplii is high.

A fall of about 1 m in waterlevel is the limit beyond which the less turbulent deep-water zone which serves as refuge for cladocerans would disappear. The amount of Dreissena polymorpha veligera larvae did not reach the same level in 2007 as before its drop between 2000 and 2003. The density, biomass and production of zooplankton regenerated completely in 2007 compared to the big decrease in 2000-2003. In the present situation in Lake Balaton, the structure of zooplankton does not reflect the different trophic states of the basins but rather seasonal changes.

Regarding invertebrates in biofilms, it was shown that the biomass of the two dominant species, Corophium and zebra mussel on the different underwater substrates (reedstalks, stony shores, piers and concrete walls and pillars of footbridges depends on waterlevel: total biomass of Corophium at a waterlevel of 110 cm exceeded 10 t, that of the zebramussel 80 t dry weight. The biomass of Corophium decreases to a completely negligable amount in the stony littoral zone at a waterlevel of 21 cm, in the reeds at below 1 cm, on other underwater sufaces at 2 and at 23 cm. The biomass of Corophium is 4 t at 50 cm and 2 t at 25 cm.

In 2007 altogether 42 taxa were observed in reed biofilms. The zebramussel occurred in the most significant amount in July in Balatonalmádi (283 000 individual m-2), the mussel constitued 72 % of all attached animals. The mussels attached to reedstalks had a mean length of 1.7 cm, a maximum of 3.6 cm. Maximum biomass was 66.8 g m-2 (dry weight with shells).

As earlier experienced, the zebra mussel can be held for a long time under laboratory conditions and is therefore a suitable animal for experiments. Control animals placed into lake water survived to almost 100 %. Even in slightly salted water (1600 µS cm-1) more than half of the animals were still alive after 72 hours. In water with higher conductivity (4600 µS cm-1) all animals died after the second day. At the highest conductivity in this experiment, 7100 µS cm-1, the mussels all died already after 24 hours.

The mussel population living in Lake Balaton is able to filter about 1.7 million m3 water algae-free daily, which is about 0.1 % of the whole water volume (1 800 million m3). Under experimental conditions the filtration rate of different sized mussels varied between 6-72 ml/mussel/hour.

Research on zoobenthos in 2007 took place in the topics "Structure and function of macro- and meiobenthos in the detritus chain of the Danube" and "Biological research on the springlake Hévíz. "Studying the qualitative and quantitative relations of the meiofanua living in the sediment of the Danube´s riverbanks, it was shown that there are significant differences in the quantitative and qualitative composition of different sampling sites. The zoomonitoring in Lake Hévíz of the biofilm fauna of five wooden and concrete pillars continued. In the studied period, the number of taxa was 15, which equals the number found earlier, but regarding the faunal composition, especially cladocerans and copepods, numerous differences can be found. Nematodes constituted 45 %, Oligochaeta 35 %, Macrocyclops albidus 9.5 % of the assemblage. The decline of Schizopera clandestina héviziensis underlines the changes in waterquality. The values of the nematode/copepod index, especially those in the autumn, showed a further negative picture considering waterquality: the results point at an enhancing pollution.

Exploring the invertebrate fauna of the tributaries of Lake Balaton, the macroscopic invertebrate fauna of small creeks around Lake Balaton was assessed. In the study altogether 323 macroscopic aquatic invertebrate taxa were identified: Malacostraca: 4, Ephemeroptera: 14, Odonata: 22, Heteroptera: 31, Coleoptera: 96, Plecoptera: 3, Trichoptera: 36, Chironomidae: 118. Most species and specimens were chironomids. Another species-rich group was the order of the beetles, but regarding individual-numbers also the mayflies and stoneflies surpassed the beetles. The high proportion of rare species proves the diversity of the creeks and their habitat heterogenity. Regarding species-richness at the localities of the studied creek sections, on most of them (one third) 20-30 species occured typically. On another third of the investigated creeks, the species number was between 30 and 50. In studies on the macroscopic aquatic invertebrate fauna of the River Zala and its catchment macroscopic aquatic invertebrates were collected on 13 sites on the Zala and on 29 sampling sites on 13 tributaries belonging to the following groups: malacostraca, mayflies, dragonflies and damselflies, stoneflies, water bugs and water striders, waterbeetles, caddis flies,dipterans: chironomids and simuliids. The presence of altogether 88 waterbeetle taxa was proved (Haliplidae 8, Dytiscidae 31, Noteridae 2, Gyrinidae 5, Hydrochidae 1, Helophoridae 7, Hydrophilidae 23, Elmidae 10, Dryopidae 1). From February till October 2007 chironomid exuvia were collected weekly from Lake Balaton. The identification of the 16 000 collected exuvia is in process.

Fish biological research

Studies were made on the topic "Changes in food preference during ontogenesis and its effect on growth and on partitioning food resources, studied on fishes in Lake Balaton". The aim of these investigations, which are still going on, is to analyze size-dependent feeding processes on the more frequent fish species of Lake Balaton in their natural habitat. It was analyzed how food resources are divided up between species as well as within a single species´ population between the different developmental stages. Fish were collected in 2004-2007 during the vegetation period with different fishing equipment in all available size groups. The composition of their food was assessed by determining the content of their stomach and the first passage of the intestines and expressed as mass-ratios. Stomach/gut content of a quality which allowed further evaluation was found in 6797 specimens of 15 species. Similarities between the foods of the species were characterized by an overlap-index in percent. If this index shows a value higher than 60%, then, based on practical experience, the overlap has to be regarded as ecologically significant. Most fish species consumed at least in the first part of their lives tiny planktonic crustaceans.

Based on studies referring to the methodology of the EU-water framework directive, suggestions were made how to alter the European standard. Test fishings were made with gillnets in the open waters of the Lake and in the littoral zone, in 1.55-4.6 m depth, with 3 standard gillnets of 1.5 m height and 3 similarly built nets, but which reached up to the water surface. On 18 occasions altogether 8904 specimens of 14 species were caught. The catch of the 1.5 m nets and the higher (3 and 4.5 m) nets did not differ in mean species numbers, but in the amount and the distribution of fish caught per time unit in water > 1.5 m. In these cases the 1.5 m high nets caught significantly less specimens of asp (Aspius aspius), bleak (Alburnus alburnus), razor fish (Pelecus cultratus). However, there was no such difference in fishes living close to the bottom. It was established that using 1.5 m EU standard gillnets, which sink to the ground, the fish stock is sampled only partly in waters deeper than 1.5 m, as a part of the fish stay in the upper water layers and can thus move freely above the nets. As the natural waters of Hungary are mostly not deeper than 6 m, it was suggested that Water Framework Directive protocols should order the use of nets covering the whole watercolumn up to this depth.

Research on the topic "The effect of environmental factors on fish assemblages of the tributaries of Lake Balaton" was conducted on the 16 tributaries of the River Zala on 26 sites in spring and summer 2007. Data on the fish stock was published from several creeks for the first time and the occurrence of 26 species was reported. More than one third of the catches constituted of roach (Rutilus rutilus), but also fürge cselle (Phoxinus phoxinus) Eurasian minnow and European Chub (Leuciscus cephalus) occurred frequently. From the studied waters 8 species were reported which are protected by law. During the assays 5 non-native species were found. It was shown that there are fish stocks in the catchment which are comparatively species-poor, dominated by rheophilous species characteristic for mountain streamlets (stone loach (Barbatula barbatula), gudgeon (Gobio gobio)), just as well as more species-rich stocks dominated by flatland-type, eurytopic and stagnophilous species.

The survey of fish assemblages of creeks flowing directly into Lake Balaton, which started in 2006, was continued. Comparing data collected in 2007 and assays conducted two decades ago on the same section of the same creeks (Lesence creek, Tapolca creek, Eger-víz) it could be established that the composition of fish assemblages is getting spatially more homogeneneous with the time. Responsible for this process are mainly introduced invasive fishes. Among these fishes Stone moroko (Pseudorasbora parva), pumpkinseed (Lepomis gibbosus) and crucian carp (Carasius gibelio) have to be mentioned.

In studies on the topic "The relationship between foodchain and trophism in shallow lake ecosystems," it was shown that due to high water-transparency (60-100% of waterdepth) submerged macrophytes appeared and reached high coverage (54% in May). Ceratophyllosum demersi (28%), Myriophylletosum spicatii (13%) and Potametosum pectinati (12%) associations were dominant. The water was according to its chlorophyll-a content (< 25 µg/l) mesotrophic till June. During this time, diatomes and greenalgea of the order Chlorococcales dominated the phytoplankton. Zooplankton was dominated by Daphnia species. In July, unexpectedly, due to a sudden lack of nitrogen, cyanobacteria (Anabaena sp.) proliferated and dominated until September. Algal biomass exceeded spring values in the summer at about one order of magnitude (chlorophyll-a, cca 250 µg/l). Water transparency sank to a fifth and due to the great shading effect of algae the coverage decreased to 28%. Bigger sized Daphnia disappeared from the water and were replaced by smaller Diaphanosoma. Secchi-depth was significantly and to a great degree determined by algal biomass and the concentration of suspended matter. After the summer algal bloom, the concentration of algal primary producers decreased to half of the summer maximum (cca 100 µg/l), and was four times as much as in the spring. Looking at the dynamics of bio-elements in the lakewater, it was found that algae are P-limited in the spring and in the autumn (N:P>15) and N-limited in the summer (N:P<15). This is supported by the changes in the concentrations of the different nitrogen-froms (NO3-N, NH4-N), which indicate spring and autumn nitrification and summer denitrification processes. N and P contents of sediment interstitial water increased with depth and 50-60% of the sediment´s phosphorus was in available form (SRP). The SRP of interstitial water in Lake Major can get into the waterbody under anaerobic conditions and/or due to bioturbation, thus influencing the trophism and functioning of the ecosystem. In the sediment, the dominant macrozoobenthic group was the chironomid larvae (subfamily Chironominae). Both densities (20-3700 ind/m2) and biomass (0.1-17.9 g wet weight/m2) showed seasonal dynamics (maxima in spring-early summer and minima in autumn), but biomass was high and varied seasonally within an order of magnitude.

Researching the topic "Dynamics and trophic interactions of fish stocks", altogether 14 species were found in the Lake using multimesh gill nets. The yearly fish catch was 210 ind/h/st.net on average (min-max: 60-394 ind/h/st.net) or 4972 g/h/st.net (min-max: 1075-8524 g/h/st.net), 20% more than in 2006. There was no great difference between catches in the spring and in the summer, but in the autumn catches decreased significantly (76-87%) regarding individual numbers as well as biomass. In Lake Major roach is the dominating fish species, making up about 50 % of total fish biomass and 68% of total fish densities. Its percentage in the entire community grew by 25% compared to 2006. Fish densities measured with echo sounder decreased regarding the whole lake in 2007 (2340±311 individual/ha). There were dominantly 10-13 cm long specimens, which is in line with the data from net fishing. Fish biomass was on average 15% greater in 2007 (246±31 kg/ha) than in 2006.

 

Results of studies in comparative neurobiology

Functional and chemical neuroanatomy, biochemical and electrophysiological characterization of inter- and intracellular signaling systems in the central and peripheral nervous system

Role of serotonin (5-HT), its receptor(s) and the second messenger system in controlling the activity and feeding of snails

Analyzing the role of the 5-HTergic system in central and peripheral (heart and foot musculature) regulatory mechanisms of gastropods (Helix pomatia, Lymnaea stagnalis), a receptor coupled adenylate cyclase was shown to participate in transmitting the effect of 5-HT at intracellular level. Application of 5-HT significantly increased the cAMP concentration both in vitro and in vivo in the CNS and peripheral tissues investigated. In contrast to 5-HT, the dopaminergic system did not possess a receptor coupled to adenylate cyclase, but as a modulator, it was capable of inhibiting the stimulatory effect of 5-HT. It was also demonstrated that during the active phase of Helix pomatia, when locomotion and heart beat activity were increased, a 5-HT dominance developed in the tissues, resulting in an increase of the cAMP concentration by the stimulation of adenylate cyclase, which then was followed by an ehnaced activity of the cAMP dependent protein kinase-A (PKA). It was found that the 5-HT»cAMP»PKA cascade mechanism resulted in the phosphorylation of a 50 kDA and a 250 kDa molecular weight protein. The 50 kDA molecular weight protein appeared in both tissues and it was proven that it is identical with the aromatic amino acid decarboxylase, whereas the 250 kDA protein was present only in the foot and it was responsible for the relaxation of the catch muscle.

The neuroanatomical features of the 5-HTergic innervation involved in the feeding behavior were described both in juvenile (embryonic) and adult CNS and buccal muscles of Lymnaea. During the late (E80-100%) embryogenic and early (P1-2) juvenile stages of development the 5-HT-immunoreactive (IR) innervation was characterized by a gradual maturation. In the CNS, beside the innervation of the neuropil, the 5-HT-IR fibers formed basket-like axo-somatic connections with both interneurons and effectors cells, while the buccal muscles were innervated polysynaptically by the marked processes. In the course of biochemical experiments performed on the buccal musculature of Lymnaea juveniles, the 5-HT level was determined, showing also a gradual increase parallel with the juvenile development. In correlation with the 5-HTergic innervation, a single component Na+ dependent 5-HT uptake system and a K+-induced Ca2+ dependent release process were demonstrated. Pharmacological characterization of the 5HT receptors in the buccal muscle indicated similar features to the vertebrate 5-HT6 receptor. The results provide further support for the modulatory role of 5-HT in feeding.

NOS-containing neurons and their intercellular contacts were identified in the CNS and peripheral nervous system of Helix. In different segments of the alimentary tract the interaction of NO and neuropeptides of molluscan type in the regulation of the peristaltic activity was shown, in conjunction with the immunocytochemical demonstration of the mutual innervation of NOergic and peptidergic neural elements. These results refer, at the same time, to the evolutionary and functional conservation of NO molecules in the animal kingdom.

Organization of the glutamatergic system in the CNS and periphery of developing and adult pond snail, Lymnaea stagnalis

In adult specimens the CNS was shown to contain a moderate number (about 45-50) glutamate immunoreactive (GLU-IR) neurons, located mainly in the cerebral, buccal and pedal ganglia. The neuropils, the connectives and commissures, and most of the peripheral nerves were all characterized by a rich GLUergic innervation. GLU-IR putative sensory cells were visualized in the periphery, such as the foot, tentacles and lip regions, moreover, the foot and buccal muscles were also innervated by efferent GLU-IR fibers. During embryogenesis GLU-IR fiber bundles appeared at E75% stage and then the entire system of GLUergic innervation was completed by the E90% stage in the CNS, at the time when the efferent GLU-IR elements could also be observed in the foot and buccal muscle. During the P1-P4 postembryonic juvenile stages the number of GLU-IR cells gradually increased, and by P4 stage the distribution pattern (but not the number) of GLU-IR neurons was the same as seen in adults. A rich network of the GLU-IR peripheral sensory system appeared by the early (P1-2) juvenile stages. Biochemical characterization of the GLUergic system in the adult Lymnaea CNS revealed the presence of a single component 3H-GLU uptake system, which could be blocked by specific pharmacological agents. It also was shown that the uptake was proportional with the number of GLU-IR neurons found in different parts (ganglia) of the CNS. The spontaneous release of 3H-GLU from the CNS could be stimulated in high K+ containing medium, while in high K+, low Ca2+ containing medium it was inhibited. These a priori results underline the neurotransmitter role of GLU in both the central and peripheral nervous system, and enable the detailed analysis of GLUergic mechanisms at different (integrative, sensory and efferent) levels.

Novel type of neuropeptides in the gastropod CNS

For the first time in the literature, the presence and distribution of the pituitary adenylate cyclase activating polypetide (PACAP) was described in the CNS and periphery of the snails, Helix, Lymnaea. A map of the PACAP-IR neurons and the PACAP-receptor bearing cells was also provided. Unlike in the CNS of vertebrates, in the gastropod brain the PACAP27 form was shown to dominate over the PACAP38 type, while in the salivary gland the PACAP27/PACAP38 ratio was reversed. It was also demonstrated that the occurrence of this peptide strongly depended on the activity state of the animals, that is whether they were active or hibernated. In salivary gland preparations PACAP activated the adenylate cyclase system leading to the increased level of cAMP, and effectively antagonized the apoptotic processes triggered by dopamine or colchicine treatment. The results refer to important physiological functions of PACAP, moreover, suggest that the occurrence of PACAP is evolutionary conserved throughout the animal kingdom.

Central and peripheral connections of the statocyst - identification of a gravireception-locomotion reflex arch

In the statocyst of Lymnaea stagnalis, the central projections, intercellular connections, possible neurotransmitter content and ultrastructure of the mechanosensory hair cells were investigated. Intracellular neurobiotin, Lucifer yellow or HRP staining, including a novel method of HRP-Streptolysin O labeling, revealed the site of axonal projections of the hair cells, arborizing in a small area of the cerebral ganglion neuropil, in the integrative center of the reflex arch. Correlative light and electron microscopy of HRP labeling also visualized the synaptic connections of these sensory elements in the brain (cerebral ganglia). The ultrastructure of the sensory hair cells displayed some particular features, as most of the cytoplasmic region was filled with vesicular and granular components, while other intracellular organelles of the cell body were localized in the peripheral and/or perinuclear regions of the perikaryon. Based on the ultrastructural appearance of the vesicles and granules, four different types of sensory hair cells could be distinguished. All the sensory hair cells were multiciliated, and the ciliae contained the typical 9+2 tubular arrangement. Immunhistochemical staining visualized of about 7-8 histamine IR, 3 GLU-IR and a single FMRFamide IR cells, while others (2-3 cells) were NADPH immunoreactive.

Apoptosis and salivation

In the salivary gland of Helix pomatia a possible new mechanism of saliva secretion was described, which involves genetically determined cell death (apoptosis) induced by activating the mitochondrial caspase-9 pathway. During this process, triggered by stimulating the innervating nerves or applying the transmitters/modulators of the neuro-glandular innervation, and in the course of which the receptor-mediated changes of membrane (mostly K+) channels alter the intracellular ionic composition. This was a time-dependent, but a rather short process, as the DNA fragmentation occurring after either the neuronal stimulus or dopamine pretreatment required shorter time by about a third, compared to the already described intra- or extracellular stimulus-induced apoptosis models. These changes resulted in a shift of the mitochondrial membrane potential which finally leads to apoptosis. Antagonists of the dopaminergic D2 receptors as well as the K+ channels blocker tetraethylammonium were shown to reduce the number of the apoptotic cells in the salivary gland, suggesting the involvement of dopamine as a neurotransmitter triggering the whole process of saliva production.

Signaling mechanisms in neuronal membranes and complex networks

Role of Mytilus Inhibitory Peptides (MIP), an endogenous (molluscan) peptide family, was studied in signaling transduction in identified neurons of Helix pomatia. It was established that the mechanisms of the MIP-triggered intracellular signaling included a pertussis toxin sensitive G-protein, and two (alpha and beta) subunits of the protein were identified by immunoblot experiments. Both subunits were involved in the MIP-triggered membrane response, which was a K+ current and this latter could be desensitized by a receptor kinase enzyme. Immunohistochemical labeling by anti-GRK2/3 antibody confirmed the presence of the kinase protein, whose functional involvement was proven by labeled phosphorus. These results provide a further contribution to our understanding peptidergic modulatory mechanisms.

It was revealed, for the first time in identified neurons of the gastropod nervous system that after classical conditioning the persistent Na+ current was enhanced, probably due to the increased number of the ion channels involved. Immunohistochemical and Western-blot experiments demonstrated the contribution of the Nav1.9 channel subtype, which was over expressed after conditioning. This enhancement, however, was independent both from increased transscription and protein synthesis in the cell. The findings obtained suggest that alteration of the intrinsic membrane properties of neurons plays a role in the formation and maintenance of learning processes, such as LTP.

In the central nervous system of Lymnaea the plasticity and reconfiguration of central pattern generator networks responsible for respiratory or feeding rhythm was studied, including the question how presynaptic activity shapes the dynamics and synaptic organization of compact neuronal networks in the pond snail Lymnaea stagnalis. Both conventional and new methods of electrophysiology were applied seeking for novel principles of plasticity, which might result in long-term, fine changes in the synaptic connectivity. The pattern clamp technique allowed control the activity of selected presynaptic neurons in a flexible manner. When using oscillatory presynaptic firing patterns as input a new, frequency selective dynamical behavior was detected in several neurons of the cardio-respiratory circuit. This resonant behavior is an outcome of the interplay between the intrinsic biophysical properties of the neurons and the temporal structure of the synaptic inputs they receive. It was found that in adult animals the synaptic interconnections were affected mainly by neurohormonal factors rather than by activity-dependent plastic changes. A dynamic reconfiguration of the neural connections was observed in experiments with neuromodulators such as 5-HT and dopamine known to play important role in memory formation at the cellular level. The results demonstrated that in mollusks, even mature synaptic connections display a remarkable degree of individual variability, reflecting the differential actions of neurochemical factors.

I-V characteristics of cultured non-synchronized CHO cells were studied by patch-clamp method. Outward K+-channels were detected only, without indication of inward Na+-currents. The membrane-properties of NE-4C neural progenitor cells were analyzed, too. Using retionic acid the cultured cells were capable of differentiating into neuronal cells. Four days after treatment, inward Ca2+-like channels appeared.

Identification of extracellular matrix components in the Gastropod nervous system

In different Gastropod species (Helix pomatia, Lymnaea stagnalis) they studied the distribution of extracellular matrix (ECM) molecules which have a pivotal role in the formation of neural networks. Applying classical histochemical techniques (acridine orange, alcian blue, and Saunders’s differential staining), the presence of proteoglycans (hyaluronan) was demonstrated in the Helix CNS, whereas proteoglycan and glycolipid content was confirmed by acriflavine-Schiff reaction both in Helix and Lymnaea. Toluidine blue basic (pH 4.0) thiazine dye stained glia cells, nuclei of some of the nerve cells, axon processes and the neuropil. Late appearance of the acriflavine-Schiff reaction during development (P1/2) reflected the slow maturation of the ECM in Lymnaea. Using 14 different lectins conjugated with fluorochrome, proteoglycans along the membrane of glial and neural perikarya and the glycoprotein (N-acetyl-galactoseamine) in the periganglionic connective tissue sheath were detected both in the Helix and Lymnaea CNS. In contrast, galactosyl-N-acetyl-galactosamine, a glycoprotein constituent, was found only in Lymnaea CNS. These differences can be explained by the different habitat and behavior of the two snail species investigated. Different lectins (DSL, LEL, STL and WGA), each labeling different N-acetyl-glucosamine oligomers, visualized different cellular (glia and/or neuron) elements, as well as different anatomical compartments of neurons. Maturation of the lectin-labeled ECM was also described during Lymnaea embryogenesis: periganglionic connective tissue appeared at E35%; CNS labeling started by E45%, meanwhile nerve cell bodies and neuropil became reactive in general between E55-90% embryonic stages. Transient labeling of N-acetyl-glucosamine-containing proteoglycans (DSL, LEL, STL and WGA) was found during embryogenesis. Phosphacan, fibronectin and chondroitin sulfate were shown by antibodies raised against specific mammalian sequences mainly in the ECM of neural tracts, rarely in the perineural net of Lymnaea. Within extracts obtained form Lymnaea and Helix CNS glycated proteins (>100 kDa) were detected with lectin probes in Western-blots. A significant difference was found between the glycated protein pattern of blots taken from Lymnaea and Helix CNS. These a priori results revealed new aspects of the structural-chemical organization of the invertebrate (Gastropoda) nervous system.

 

Results in neuro- and exotoxicological studies

Identification of extracellular matrix components in the Gastropod nervous system

Behavioral effects of neurotoxins

In vertebrates, rotenone, a commercially available organic pesticide were shown to induce symptoms of Parkinson´s disease, related to the selective loss of dopamine-containing neurons in the CNS. Based on it, the current studies concerned the behavioral and neuronal effects of sublethal doses of rotenone in the pond snail, Lymnaea stagnalis. Following both acute and chronic exposure in a concentration range of 0.1 - 5 µM, rotenon caused progressive and irreversible behavioral deficits of intact, spontaneously moving and feeding animals, reflected by shorter distances performed during locomotion and longer feeding latency and reduced feeding rate (radula protrusion). In acute experiments 1-5 µM rotenone treatment affected both behaviors after 1-3 hours, while chronic treatment with 0.5 µM rotenone resulted in an almost 100% inhibition of both behaviors by the 8th day of administration. Experiments on the CNS suggested damage of the dopaminergic system behind the behavioral changes. In CNS preparations obtained on the 8th day of rotenon exposure HPLC assay showed a significant (20%) decrease of dopamine level in the CNS, moreover, the identified dopaminergic RPeD1 neuron failed to evoke any postsynaptic responses on its follower neurons. Immunostaining revealed decreased tyrosine hydroxylase activity in the RPeD1 cell body and its axonal processes, suggesting the impairment of the neurotransmitter synthesis involved in selective synaptic failure of dopaminergic neurotransmission. It is concluded that, as in vertebrates, rotenone evokes behavioral dysfunctions related to impairment of the dopaminergic system in the CNS. Therefore it is suggested that Lymnaea stagnalis is a suitable invertebrate model to study of Parkinson´s symptoms both at behavioral and neuronal level.

 

Toxicity studies in model invertebrates

Identification of extracellular matrix components in the Gastropod nervous system

General features of rotenone toxicity in aquatic invertebrates

Toxicological experiments concerning rotenone evoked mortality showed dose-dependent effects on 24 hours nauplii larvae of the the brine shrimp, Artemia salina LC50: 0.37 µM). Other known dopaminergic neurotoxins (MPTP and MPP+) also had toxic effects, although only after applying much higher concentrations. Intact specimens of the freshwater amphipod Dikerogammarus also showed dose dependent mortality of the same magnitude of concentrations as in Artemia (LC50: 0.54 µM). Moreover, behavioral tests showed decreased locomotion and frequency of pleupodium movements in sublethal doses (0.2-0.8 µM) of rotenone. Biochemical assays demonstrated increased activity of glutathione-S-transferase in different tissues of all rotenon-treated animals (Lymnaea, Artemia and Dikerogammarus). It is concluded that the effects of rotenone share many behavioral and intracellular mechanisms in different aquatic invertebrates suggesting common targets, including oxidative stress and the impairment of the dopaminergic system.

Identification of extracellular matrix components in the Gastropod nervous system

Effect of insecticides on the nervous system of model invertebrates

Electrophysiological experiments were performed on in vitro neuronal preparations obtained from Helix pomatia, including the respiratory interneuron known as right pedal interneuron (RPeD1) and motoneurons of the respiratory network, to determine the effects of the active substances (bensultap - nicotinic ACh antagonist, fenilpirazol - ionotropic GABAA and GABAC antagonist) of insecticides (bancol, fipronil). It was demonstrated that bensultap altered the synaptic transmission and caused a significant decrease of the ACh-induced current. Low concentration of fipronil induced a sustained decrease of action potential firing frequency.

 

Scientific publications

2003

Berecz, K., Debreczeni, B. & Présing, M. (2003) Utilitation of soil and fertilizer N by corn. - In: Környezeti ártalmak és a légzőrendszer, Eds: Szabó, T., Bártfai, I. & Somlai, J., F&F Press Bt., Zalaegerszeg, XIII: 47-56. (In Hungarian)

Berecz, K., Debreczeni, B. & Présing, M. (2003) Study of utilization of N-fertilizers by hybrid corns. - XLV. Georgikon Days, Keszthely 2003, New strategies in the agriculture Pannon Agricultural University, Keszthely, ISBN 963 9495 263. pp. 1. (In Hungarian)

Bíró, P. (szerk.) (2003) Rarely studied and peculiar waters. - Hidrológiai Közlöny, 83(I-XII): pp.170. (In Hungarian)

Bíró, P. & Specziár, A. (2003) Irreversible process? - Alterations in the fauna of Lake Balaton. - Új Balaton, 90-95. (In Hungarian)

Bíró, P., Specziár, A. & Keresztessy, K. (2003) Qualitative-quantitative survey of native fish populations, their stock-dynamics and trophic relationships in Lake Balaton. - In: Mahunka, S. & Banczerowski, J. (eds.) Results of Lake Balaton Research in 2002, Hungarian Academy of Sciences, Budapest, pp. 131-139. (In Hungarian)

Bíró, P., Specziár, A. & Keresztessy, K. (2003) Diversity of fish species assemblages distributed on the drainage area of Lake Balaton (Hungary). - Hydrobiologia, 506-509: 459-464.

Bíró, P. (2003) In buffer zone of concerus. - Új Horizont, 4: 1-7. (In Hungarian)

Bíró, P. (2003) Biodiversity of surface waters: food-webs, material circulation. Scientific Lectures 2003. VEAB General Assembly, Veszprém, December 2002., 33-54. (In Hungarian)

Bíró, P. (2003) Fisheries and angling must also be regulated. - Balatoni Futár. (In Hungarian)

Bíró, P. (Ed.) (2003) Water drainage of River Tisza I., 2nd part: Water quality and environmental. Hungary at the fun of millenium. Strategic researches in the Hungarian Academy of Sciences IV. Program: Scientific foundation of territory develpment 4, Sub-program: The Tisza. MTA Társadalomkutató Központ, Budapest, pp. 150-275. (In Hungarian)

Csányi, B., Ambrus, A., Juhász, P., Kovács, T., Kavrán, V., Németh, J. & Vörös, L. (2003) The EU Water Framework Directives and the monitoring of the Hungarian section of River Tisza. - In: (Teplán I. ed.) River Tisza and its water system. Hungarian Academy of Sciences, Budapest, pp. 205-236. (In Hungarian)

Csoknya, M., Barna, J., Hiripi, L., Hámori, J. & Elekes, K. (2003) Reorganization of the monoaminergic (serotonin, dopamine) system in the earthworm (Eisenia fetida), following brain extirpation. - J. exp. Zool., 296A: 118-129.

Elekes, K., Vörös, L., Hegedűs, E., N. Fekete, Zs., Balázs, B. & Ferenczy, L. (2003) Electron microscopic identification of viruses and the potential role of bacteriophages in the distribution of toxin producing cyanobacteria in Lake Balaton. II. Results in 2002. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2002, Hungarian Academy of Sciences, Budapest, pp. 61-69. (In Hungarian)

Farkas, A., Salánki, J., & Specziár, A. (2003) Age- and size specific patterns of heavy metals in the organs of freshwater fish Abramis brama L. populating a low contaminated site. - Water Res., 37: 959-964.

Farkas, A., Salánki, J. & Varanka, I. (2003) The use of planktonic crustaceans for the characterisation of heavy metal pollution of Lake Balaton. - Hidrológiai Közlöny, 83: 47-50. (In Hungarian)

G.-Tóth, L., Muskó, B. I., Szalontai, K., Kiszely, P. & Németh, P. (2003) Study of invertebrates of the open water and the littoral zone of Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2002, Hungarian Academy of Sciences, Budapest, pp. 100-108. (In Hungarian)

Herodek, S. & Tóth, V. (2003) Factors limiting distribution of macrophytes in Lake Balaton IV. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2002, Hungarian Academy of Sciences, Budapest, pp. 58-92. (In Hungarian)

Hiripi, L., Filla, A., Shafik, H.M., V.-Balogh, K. & Herodek, S. (2003) Phosphorus uptake of phytoplankton with especial regard to the role of exoenzymes. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2002, Hungarian Academy of Sciences, Budapest, pp. 18-25. (In Hungarian)

Kiss, T., Hiripi, L., László, Z. & Elekes, K. (2003) Dopamine and serotonin receptors mediating contractions of the snail (Helix pomatia) salivary duct. - Neuroscience, 116: 775-790.

Kiss, T. (2003) Evidence for a persistent Na-conductance in identified command neurones of the snail. - Brain. Res., 989: 16-25.

Kovács, W.A., Koncz, E. & Vörös, L. (2003) Akinete abundance of N2-fixing cyanobacteria in sediment of Lake Balaton (Hungary). - Hydrobiologia, 506: 181-188.

Kovács, T., Ambrus, A. & Juhász, P. (2003) Data to the Hungarian mayfly (Ephemeroptera) fauna arising from collectings of larvae II. - Folia historico-naturalia Musei matraensis, 27: 157-162.

Kováts, N., Szalay, T., Kiss, I., Kárpáti, Á. & Paulovits, G. (2003) Assessment of degradability in whole effluent toxicity testing using bioluminescent bacteria. - Hung. J. Industrial Chem., 30: 271-274.

Kováts, N., Szalay, T., Kárpáti, Á. & Paulovits, G. (2003) Assessment of natural processes in treated waste water using ToxAlert system. - Labinfo, 3: 37-40. (In Hungarian)

Mátyás, K., Korponai, J., Oldal, I., Tátrai, I. & Paulovits, G. (2003b) Changes in TP/Chl-a regressions in shallow hypertrophic reservoirs as consequence of different fish communities. - Hydrobiologia, 504: 231-239.

Muskó, I. B. & Leitold, H. (2003) Occurrence and density of Malacostraca on submerged macrophytes in different basins of Lake Balaton. - Hidrológiai Közlöny, 83: 14-16. (In Hungarian)

Muskó, I. B., Balogh, Cs., Görög, Sz. & Bence, M. (2003) Settling of Dreissena polymorpha on natural substrates implanted into Lake Balaton. - Hidrológiai Közlöny, 83: 17-19. (In Hungarian)

Parpala, L., G.-Tóth, L., Zievici, V., Szalontai, K. & Németh, P. (2003) The summer zooplankton structure and productivity in Lake Balaton. - Hydrobiologia, 506-509: 347-351.

Pálffy, K. & Vörös, L. (2003) Effect of ultraviolet radiation on phytoplankton primary production in Lake Balaton. - Hydrobiologia, 506: 289-296. (In Hungarian)

Ponyi, J. & P. Zánkai, N. (2003) The hydro-zoological examination of Tetves stream. - Natura Somogyiensis, 5: 29-40. (In Hungarian)

Ponyi, J., P. Zánkai, N., Szitó, A. & Kravinszkaja, G. (2003) Zoological monitoring of creeks flowing into Lake Balaton IV. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2002, Hungarian Academy of Sciences, Budapest, pp. 118-130. (In Hungarian)

Présing, M., Sprőber, P., Shafik, H. & Herodek, S. (2003) Characterising the nitrogen uptake of phytoplankton and internal nitrogen demand III. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2002, Hungarian Academy of Sciences, Budapest, pp. 26-34. (In Hungarian)

Présing, M., Preston, T., Takátsy, A., Kovács, A., Sprőber, P. & Kovács, Gy. (2003) Ammonium regeneration and nitrogen uptake in Lake Balaton. - Hidrológiai Közlöny, 83: 122-124. (In Hungarian)

Salánki, J., Farkas, A., Kamardina, T. & S.-Rózsa K. (2003) Molluscs in biological monitoring of water quality. - Toxicology Letters, 140-141C: 403-410.

Serfőző, Z., Rőszer, T., Kemenes, G., Korneev, T.E., Veréb, Z. & Elekes, K. (2002) Development of nitric oxide synthase/cGMP system mRNA in the embryonic and juvenile pond snail, Lymnaea stagnalis L. A comparative in situ hybridization, histochemical and immunohistochemical study. - J. Neurocytology, 31: 131-147.

Shafik, H.M., Vörös, L., Sprőber, P., Présing, M. & Kovács, A.W. (2003) Some special morphological features of Cylindrospermopsis raciborskii in batch and continuous cultures. - Hydrobiologia, 506: 163-167.

Specziár, A. (2002) [2003] Diet of age-0 pikeperch and age-0 Volga pikeperch in Lake Balaton. - Halászatfejlesztés, 27: 70-80. (In Hungarian)

Specziár, A. & Bíró, P. (2003) Population structure and feeding characteristics of Volga pikeperch, Sander volgensis (Pisces, Percidae) in Lake Balaton. - Hydrobiologia, 506-509: 503-510.

Specziár, A., Bíró, K., Bíró, P. & Vörös, L. (2003) Ecological role of benthic chironomid larvae (Chironomidae, Diptera) in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2002, Hungarian Academy of Sciences, Budapest, pp. 109-117. (In Hungarian)

Sprőber, P., Shafik, H.M., Présing, M., Kovács, W.A. & Herodek, S. (2003) Nitrogen uptake and fixation of Cylindrospermopsis raciborskii cyanobaterium depending on nutrition supply. - Hydrobiologia, 169-174.

Sváb, E., Tyler, A., Preston, T., Antal, K. & Présing, M. (2002) Remote sensing in assessing water quality on Lake Balaton. - Hidrológiai Közlöny, 83: 136-138. (In Hungarian)

Szalontai, K., G.-Tóth, L. & Muskó, I.B. (2003) Oxygen consumption of Limnomysis benedeni Czernovsky, 1882 (Crustacea: Mysidacea) a pontocaspian species in Lake Balaton, Hungary. - Hydrobiologia, 505-506: 407-411.

Szűcs, A., Pinto, R.D., Rabinovich, A.I., Abarbanel, H.D.I. & Selverston, A.I. (2003) Synaptic modulation of the interspike interval signatures of bursting pyloric neurons. - J. Neurophysiol., 89: 1363-1377.

Tátrai, I., Mátyás, K., Korponai, J., Paulovits, G., Pomogyi, P. & Héri, J. (2003) Regulation by omnivore cyprinids on phytoplankton and zooplankton structure in an extremely shallow manipulated lake in the Kis-Balaton Reservoir System. - Hydrobiologia, 504: 241-250.

Tátrai, I., Mátyás, K., Korponai, J., Paulovits, G. & Pekár, F. (2003) Management of fish communities and its impacts on the lower trophic levels in shallow ecosystems in Hungary. - Hydrobiologia, 506-509: 489-497.

Tátrai, I., Paulovits, G., Mátyás, K. & Korponai, J. (2003) The role of fish communities in water quality management of large shallow lake. - Int. Rev. Hydrobiol., 88: 498-507.

Tátrai, I., Paulovits, G., Józsa, V. & Szabó, I. (2003) Stock size of the introduced fish species in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2002, Hungarian Academy of Sciences, Budapest, pp. 140-148. (In Hungarian)

Varga, A., Kovács, T. & Juhász, P. (2003) New occurrence of Sphaerium (Cyrenastrum) solidum (Normand, 1844) and Corbicula fluminea (O.F. Müller, 1774) in Hungary and in Slovakia (Bivalvia: Sphaeriidae, Corbiculidae) - Malakológiai Tájékoztató, 21: 69-72. (In Hungarian)

V.-Balogh, K., Vörös, L. & Kovács A. (2003) Effect of humic substances on the water quality. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2002, Hungarian Academy of Sciences, Budapest, pp. 52-60. (In Hungarian)

V.-Balogh, K., Vörös, L., Tóth, N. & Bokros, M. (2003) Changes of organic matter quality along the longitudinal axis of a large shallow lake (Lake Balaton). - Hydrobiologia, 506: 67-74.

Voronezhskaya, E.E. & Elekes, K. (2003) Expression of FMRFamide encoded peptides gene in the developing nervous system of Lymnaea stagnalis. - Cell Tissue Res., 314: 297-313.

Vörös, L. & V.-Balogh, K. (2003) Photoautotrophic picoplankton in the natron lakes in the Danube-Tisza Interfluve. - Természetvédelmi Közlemények, 10: 35-39. (In Hungarian)

Vörös, L., V.-Balogh, K., Koncz, E. & Kovács, A. (2003) Phytoplankton and bacterioplankton production in reed covered water bodies. - Aquatic Botany, 77: 99-110.

Vörös, L., Kovács, A., Farkas, A., Shafik, H.M. & V.-Balogh, K. (2003) Role of iron in algal development. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2002, Hungarian Academy of Sciences, Budapest, pp. 43-51. (In Hungarian)

Vörös, L., Kovács, A. & V.-Balogh, K. (2003) Phytoplankton and phytobenthos in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2002, Hungarian Academy of Sciences, Budapest, pp. 9-17. (In Hungarian)

2004

Balogh, Cs. & Muskó, I.B. (2004) The population dynamics of Dreissena polymorpha on submerged macrophytes in Lake Balaton. - Hidrológiai Közlöny, 84: 14-16. (In Hungarian)

Bence, M. & Muskó, I.B. (2004) Occurrence of a new Ponto-Caspian species, Cordylophora caspia, in Lake Balaton. - Hidrológiai Közlöny, 84: 20-22. (In Hungarian)

Bíró, P. & Oertel, N. (2004) Main trends and tasks in hydrobiology. - Magyar Tudomány, 37-48. (In Hungarian)

Farkas, A. (2004) Assessment of environmental pollutants in Lake Balaton and the toxic effect of contaminants on the behavior of aquatic organisms. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2003, Hungarian Academy of Sciences, Budapest, pp. 128-136. (In Hungarian)

Filla, A., Hiripi, L. & Elekes, K. (2004) Serotonergic and dopaminergic influence of the duration of embryogenesis and intracapsular locomotion of Lymnaea stagnalis L. - Acta Biol. Hung., 55: 315-321.

Fujikura, K., Aoki, M., Ichibayashi, Sh., Imamura, M., Ishibashi, J-I., Iwase, R., Kato, K., Kosaka, A., Maciyama, H., Miyake, H., Miyazaki, J-I., Mizota, Ch., Okoshi, K., Okoshi, W-S., Okutani, T., Satoh, T., G.-Tóth, L., Tsuchida, Sh., Wakamatsu, M., Watanabe H., Yamanaka, T. & Yamamoto, H. (2004) Report on investigation of vent and methane seep ecosystems by the crewed submersible "Shinkai - 2000" and the ROV "Dolphin 3K" on the Hatoma and Kuroshima Knolls, the Nansei-shoto area. - JAMSTEC J. Deep Sea Res., 22: 21-30.

G.-Tóth, L., Muskó, I.B., Balogh, Cs., Németh, P., Homonnay, Z. & Kiszely, P. (2004) Study of invertebrates of the open water and the littoral zone of Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2003, Hungarian Academy of Sciences, Budapest, pp. 73-81. (In Hungarian)

Hegedűs, E., Kaslin, J., Hiripi, L., Kiss, T., Panula, P. & Elekes, K. (2004) Histaminergic neurons in the central and peripheral nervous system of Gastropods (Helix, Lymnea): An immunocytochemical, biochemical and electrophysiological approach. - J. Comp. Neurol., 475: 391-405.

Hegedűs, E., Kaslin, J. & Elekes, K. (2004) Embryogenesis of the histaminergic system in the pond snail, Lymnaea stagnalis L.: An immunocytochemical and biochemical study. - Acta Biol. Hung., 55: 301-313.

Hernádi, L., Hiripi, L., Dyakonova, V., Győri, J. & Vehovszky, Á. (2004) The effect of food intake on the central monoaminergic system in the snail, Lymnaea stagnalis. - Acta Biol. Hung., 55: 185-194.

Herodek, S. & Tóth, V. (2004) Comparative studies on healthy and decaying reed stands. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2003, Hungarian Academy of Sciences, Budapest, pp. 64-72. (In Hungarian)

Hiripi, L., Filla, A. & Herodek, S. (2004) Phosphorus uptake of phytoplankton with especial regard to the role of exoenzymes. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2003, Hungarian Academy of Sciences, Budapest, pp. 27-35. (In Hungarian)

Juhász, P., Kovács, T., Ambrus, A. & Kavrán, V. (2004) Data to the knowledge of the mollusc fauna living in the Hungarian segment of the River Tisza (Molluscs: Gastropoda, Bivalvia). - Malakológiai tájékoztató=Malacological newsletter, 22: 97-130.

Korponai, J., Tátrai, I., Mátyás, K. & Paulovits, G. (2004) Zooplankton changes in a biomanipulation experiment. - Hidrológiai Közlöny, 84: 59-61. (In Hungarian)

Mátyás, K., Korponai, J., Tátrai, I. & Paulovits, G. (2004) Long term effect of cyprinid fishes on phytoplankton and zooplankton communities in a shallow water protection reservoir. - Int. Rev. Hydrobiol., 89: 68-78.

Molnár, G., Salánki, J. & Kiss, T. (2004) Cadmium inhibits GABA-activated ion currents by increasing intracellular calcium level in snail neurons. - Brain Res., 1008: 205-211.

Mózes, A. & Vörös, L. (2004) Unusual picoplankton communities in the frozen Lake Balaton. - Hidrológiai Közlöny, 84: 85-87. (In Hungarian)

Muskó, I.B., Balogh, Cs., Bakó, B., Leitold, H. & Tóth, Á. (2004) Seasonal dynamics of invertebrates living on submerged macrophytes in Lake Balaton, with special regard to some Ponto-Caspian invasive species. - Hidrológiai Közlöny, 84: 12-13. (In Hungarian)

Németh, P. & G.-Tóth, L. (2004) The structure of the zooplankton and some physics-chemical prameters in two cross-sections of Lake Balaton in drought summers of 2002 and 2003. - Hidrológiai Közlöny, 84: 101-103. (In Hungarian)

Padisák, J., Soróczki Pintér, É., Hajnal, É. & Zámbóné Doma, Zs. (2004) Spatial and temporal pattern of the phytoplankton in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2003, Hungarian Academy of Sciences, Budapest, pp. 16-26. (In Hungarian)

Pálffy, K., Ördög, V. & Vörös, L. (2004) Effect of ultraviolet radiation on laboratory coltures of green algae and cyanobacteria. - Hidrológiai Közlöny, 84: 115-117. (In Hungarian)

Parpala, L., G.-Tóth, L., Zinevici, V. & Szalontai, K. (2004) Ecological parameters of zooplankton in Lake Balaton (Hungary). - Proc. Inst. Biol., 6: 93-103.

Pirger, Zs., Elekes, K. & Kiss, T. (2004) Functional morphology of the salivary gland of the snail, Helix pomatia: A historical and immunocytochemical study. - Acta Biol. Hung., 55: 221-232.

Pitt, S., Vehovszky, Á., Szabó, H. & Elliott, C.J.H. (2004) Second messengers of octopamine receptors in the snail Lymnaea. - Acta Biol. Hung., 55: 177-183.

Ponyi, J. (2003) [2004] The crabs in the small streams flowing into Lake Balaton. - Hidrológiai Tájékoztató, 24-25. (In Hungarian)

Ponyi, J. (2004) Results of the biological monitoring performed in Lake Hévíz obtained so far. - Hidrológiai Tájékoztató, 49-52. (In Hungarian)

Ponyi, J. & P. Zánkai, N. (2004) Zoological research of Zala River I. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2003, Hungarian Academy of Sciences, Budapest, pp. 82-89. (In Hungarian)

Présing, M., Kovács, A., Shafik, H.M. & Kenesi, Gy. (2004) Nitrogen demand of phytoplankton and the significance of several nitrogen sources of Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2003, Hungarian Academy of Sciences, Budapest, pp. 36-44. (In Hungarian)

Röszer, T., Jenei, Zs., Gáll, T., Nagy, O., Czimmerer, Zs., Serfőző, Z., Elekes, K. & Bánfalvi, G. (2004) A possible stimulatory effect of FMRFamide on neural nitric oxide production in the central nervous system of Helix lucorum L. - Brain, Behav. Evol., 63: 23-33.

Rezsu, E., Specziár, A., Nagy, S.A. & Dévai, Gy. (2003) [2004] Feeding ecology of perch (Perca fluviatilis) and ruffe (Gymnocephalus cernuus) in Lake Balaton. - Halászatfejlesztés, 28: 153-162. (In Hungarian)

Rezsu, E., Specziár, A., Nagy, S. & Dévai, Gy. (2004) Ontogenetic pattern of the diet in perch (Perca fluviatilis) and ruffe (Gymnocephalus cernuus) in Lake Balaton. - Hidrológiai Közlöny, 84: 128-129. (In Hungarian)

Shafik, H.M., Herodek, S., Présing, M. & Vörös, L. (2004) Competition among freshwater phytoplankton species for ammonium in flow-through cultures. - Algological Studies 112: 157-176. (Arc. Hydrobiol. Suppl., 152).

Specziár, A. (2004) Biological characteristics of the eastern mosquitofish (Gambusia holbrooki) in Lake Hévíz. - Hidrológiai Közlöny, 84: 133-135. (In Hungarian)

Specziár, A. (2004) Long term patterns of the chironomid fauna and the feeding of fish in Lake Balaton. - In: Scientific lectures 2004 /Regional Centre of the Hungarian Academy of Sciences, Veszprém, pp. 69-85. (In Hungarian)

Specziár, A. (2004) Life history pattern and feeding ecology of the introduced eastern mosquitofish, Gambusia holbrooki, in a thermal spa under temperate climate, of Lake Hévíz, Hungary. - Hydrobiologia, 522: 249-260.

Specziár, A. & Bíró, P. (2004) Characteristics of cannibalism in 0+ pikeperch (Sander lucioperca) in Lake Balaton. - Hidrológiai Közlöny, 84: 136-139. (In Hungarian)

Specziár, A. & Bíró, P. (2004) Feeding strategy, trophic relationships, growth and survival of juveniles of native fish species in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2003, Hungarian Academy of Sciences, Budapest, pp. 99-107. (In Hungarian)

Szentes, G., Tóth, N., V.-Balogh, K. & Marton, A. (2004) Molecular size distribution and humic properties of dissolved organic substances in Lake Balaton. - Hidrológiai Közlöny, 84: 153-155. (In Hungarian)

Szűcs, A., Vehovszky, Á., Molnár, G., Pinto, R.D. & Abarbanel, H.D.I. (2004) Reliability and precision of neural spike timing: simulation of spectrally broadband synaptic inputs. - Neuroscience, 126: 1063-1073.

Tátrai, I., Józsa, V., Szabó, I., Paulovits, G. & Györe, K. (2004) The effect and biological role of silver carp in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2003, Hungarian Academy of Sciences, Budapest, pp. 90-98. (In Hungarian)

Tóth, N., V.-Balogh, K. & Vörös, L. (2004) Biological availability of dissolved organic substances in Lake Balaton. - Hidrológiai Közlöny, 84: 180-182. (In Hungarian)

V.-Balogh, K., Tóth, N. & Vörös, L. (2004) Effect of meteorological and hidrological changes on the role of organic(humic) substances in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2003, Hungarian Academy of Sciences, Budapest. pp. 45-53. (In Hungarian)

Varga, É., Muskó, I.B., Tóth, Á.P., Gór, D. & Lakatos, Gy. (2004) Spatial and temporal changes in epilithon of Lake Balaton. - Hidrológiai Közlöny, 84: 168-169. (In Hungarian)

Vehovszky, Á., Szabó, H. & Elliott, C.J.H. (2004) Octopamine-containing (OC) interneurons enhance central pattern generator activity in sucrose-induced feeding in the snail Lymnaea. - J. Comp. Physiol., 190A: 837-846.

Vehovszky, Á., Szűcs, A., Szabó, H., Pitt, S. & Elliott, C.J.H. (2004) Octopaminergic modulation of the membrane currents in the central feeding system of the pond snail Lymnaea stagnalis. - Acta Biol. Hung., 55: 167-176.

Vörös, L., Kovács, W.A., Pájer, Gy. & Mózes, A. (2004) Role and regulating factors of the planctonic and the bentic algal communities in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2003, Hungarian Academy of Sciences, Budapest, pp. 7-15. (In Hungarian)

2005

Bíró, P. (2005) Main results of the zoological investigations in Lake Balaton. - In: Tudomány, Innováció, Életminőség. Az MTA intézetei az ország gyarapodásáért, Eds.: Bálint, Cs., Dudits, D., Pálinkás, G., Cerberus Kft. Budapest, pp. 25-30. (In Hungarian)

Bíró, P. (2005) Dr. Elek Woynarovich is 90 years old. - Halászat, 98: 83-85. (In Hungarian)

Bíró, P. (2005) Ottó Herman and the Hungarian fisheries. - Magyar Tudomány, 2005: 232-238. (In Hungarian)

Bíró, P. (Ed.) (2005) Effects of extreme environmental conditions on life of waters. - Hidrológiai Közlöny, 85. pp. 184. (In Hungarian)

Bányász, D., Németh, B. & Vörös, L. (2005) Depth distribution of microphytobenthos in Lake Balaton. - Hidrológiai Közlöny, 85: 18-20. (In Hungarian)

Borics, G., Grigorszky, I., Padisák, J., Barbosa, F.A.R. & Z.-Doma, Zs. (2005) Dinoflagellates from tropical Brazilian lakes with description of Peridinium brasiliense sp. nov. - Archiv für Hydrobiologie, Suppl., 160, Algological Studies, 118: 47-61.

Buczkó, K., Vörös, L. & Cserny, T. (2005) The Diatom flora and vegetation of Lake Balaton from sediment cores according to Márta Hajós`s legacy. - Acta Bot. Hung., 47: 75-115.

Csabai, Z., Móra, A., Boda, P., Cser, B. & Málnás, K. (2005) Contribution to the aquatic insect fauna of the northern part of the Bakony Mountains (Ephemoroptera, Coleoptera, Heteroptera and Trichopter). - Folia Mus. Hist.-Nat. Bakony, 22: 69-100.

Csoknya, M., Takács, B., Koza, A., Dénes, V., Hiripi, L., Kaslin, J. & Elekes, K. (2005) Neurochemical characterization of nervous elements innervating the body-wall of earthworms (Lumbricus, Eisenia). Immunocytochemical and pharmacological studies. - Cell Tissue Res., 321: 479-490.

Denker, M., Szűcs, A., Pinto, R.D., Abarbanel, H.D.I. & Selverston, A.I. (2005) A network of electronic neural oscillators reproduces the dynamics of the periodically forced pyloric pacemaker group. - IEEE Transactions Biomed. Engin., 52: 792-798.

Erős, T. (2005) Life-history diversification in the Middle Danubian fish fauna - a conservation perspective. - Arch Hydrobiol. Suppl., 158/1-2., Large Rivers 16. 1-2., pp. 289-304.

G.-Tóth, L., B. Muskó, I., Balogh, Cs., Németh, P. & Kiszely, P. (2005) Study of invertebrates of the open water and the littoral zone of Lake Balaton. In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2004, Hungarian Academy of Sciences, Budapest, pp. 45-53. (In Hungarian)

Harka, Á. & Bíró, P. (2005) New patterns in Danubian distribution of Ponto-Caspian gobies - a result of global warming and/or canalization? - Hidrológiai Közlöny, 85: 44-47. (In Hungarian)

Harka, Á., Halasi-Kovács, B., Sevcsik, A., Tóth, B. & Erős, T. (2005) Neogobius gymnotrachelus (Kessler, 1857) in the Hungarian stretch of the river Danube. - Halászat, 98: 163-168. (In Hungarian)

Hernádi, L., Vehovszky, Á., Hiripi, L., Győri, J., Walker, R.J. & Elekes, K. (2005) Neuroanatomical, immunocytochemical and physiological studies on the pharyngeal retractor muscle and its putative regulatory neurons playing role in both withdrawal and feeding in the snail, Helix pomatia. - Cell Tissue Res., 321: 257-271.

Herodek, S., Tóth, V. & Lukács, V. (2005) Comparative studies on healthy and decaying reed stands. II.: Results in 2004. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2004, Hungarian Academy of Sciences, Budapest, pp. 65-74. (In Hungarian)

Hiripi, L., Filla, A. & Herodek, S. (2005) Phosphorus uptake of phytoplanton with specific respect to the role of exoenzymes. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2004, Hungarian Academy of Sciences, Budapest, pp. 27-36. (In Hungarian)

Istvánovics, V., Honti, M., Osztoics, A., Shafik, H.M., Padisák, J., Yacobi, Y. & Eckert, W. (2005) Continuous monitoring of phytoplankton dynamics in Lake Balaton (Hungary) using on-line delayed fluorescence excitation spectroscopy. - Freshwater Biology, 50: 1950-1970.

Jeppesen, E., Sondergaard, M., Jensen, J.P., Havens, K.E., Anneville, O., Carvalho, L., Coveney, M.F., Deneke, R., Dokulil, M.T., Foy, B., Gerdeaux, D., Hampton, S.E., Hilt, S., Kangur, K., Köhler, J., Lammens, E.H.H.R., Lauridsen, T.L., Manca, M., Miracle, M.R., Moss, B., Nöges, P., Persson, G., Phillips, G., Portielje, R., Romo, S., Schelske, C.L., Straile, D., Tátrai, I., Willén, E. & Winder, M. (2005) Lake responses to reduced nutrient loading - an analysis of contemporary data from 35 European and North Americaln long term studies. - Freshwater Biology, 50: 1747-1771.

Kiss, T. (2005) G-protein coupled activation of potassium channels by endogenous neuropeptides in snail neurons. - Eur. J. Neurosci., 21: 2177-2185.

Kovács, W.A., Németh, B., Présing, M., Tóth, N. & Vörös, L. (2005) Light and temperature dependence of photosynthesis of Cladophora in Lake Balaton (Hungary). - Hidrológiai Közlöny, 85: 81-84. (In Hungarian)

Kováts, N., Borbély, G., Magyar, I., Szép, Zs., Paulovits, G. & Pomogyi, P. (2005) Mapping sediment toxicity in the Kis-Balaton Water Protection System. - Térinformatika, 5: 13-15. (In Hungarian)

Kováts, N., Kovács, J., Paulovits, G. & Hiripi, L. (2005) Application of ToxAlert 100 for assessing pollution in surface waters. - Hidrológiai Tájékoztató, 2005: 10-13. (In Hungarian)

Mózes, A., Présing, M. & Vörös, L. (2005) Planktonic picoeukariotes and picocianobacteria in Lake Balaton. - Hidrológiai Közlöny, 85: 97-99. (In Hungarian)

Muskó, I.B., Balogh, Cs., Varga, É. & Tóth, Á.P. (2005) Seasonal dynamics of invertebrata living in the littoral zone of Lake Balaton in the droughty 2003 year, with special reference to some Ponto-Caspian invasive species. - Hidrológiai Közlöny, 85: 7-9. (In Hungarian)

Muskó, I.B. & Bakó, B. (2005) The density and biomass of Dreissena polymorpha living on submerged macrophytes in Lake Balaton (Hungary). - Archiv für Hydrobiologie, 162: 229-251.

Nöges, P., G.-Tóth, L., van de Bound, W., Cardoso, A.Cr., Haastrup, P., Wuertz, J., de Jager, A., McLean, A. & Heiskanen, A.-S. (2005) The Water Framework Directive final intercalibration register for lakes, rivers, coastal and transitional waters: overview and analysis of metadata. - European Commission DG-Joint Research Centre, EUR 21671: 1-92.

Pirger, Zs., Elekes, K. & Kiss, T. (2005) Electrical properties and voltage-gated ion-channels of the salivary gland cells of the snail, Helix pomatia. - Eur. Biophys. J., 34: 651.

Ponyi, J. & P. Zánkai, N. (2005) Zoological research of Zala River II. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2004, Hungarian Academy of Sciences, Budapest, pp. 84-91. (In Hungarian)

Ponyi, J. (2005) The fauna of the subsurface parts (hyporheal) of flowing waters. - Hidrológiai Tájékoztató, pp. 20-21. (In Hungarian)

Présing, M., Kovács, A., Kenesi, Gy. & Vörös, L. (2005) Nitrogen demand of phytoplankton and the significance of several nitrogen sources of Lake Balaton II. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2004, Hungarian Academy of Sciences, Budapest, pp. 36-45. (In Hungarian)

Présing, M., Preston, T., Kovács, W.A., Shafik, H.M. & Kenesi, Gy. (2005) The contribution of N2 fixation to the nitrogen supply of phytoplankton in Lake Balaton. - Hidrológiai Közlöny, 85: 177-179. (In Hungarian)

Rezsu, E., Specziár, A. & Nagy, S.A. (2005) Feeding of pumpkinseed [Lepomis gibbosus (Linnaeus, 1758)] in two areas of different trophic state of Lake Balaton. - Halászat, 98: 30-36. (In Hungarian)

Specziár, A. (2004) [2005] Natural recruitment of pikeperch and Volga pikeperch in Lake Balaton. - Halászatfejlesztés, 29: 113-124. (In Hungarian)

Specziár, A. (2005) First year ontogenetic diet patterns in two coexisting Sander species, S. lucioperca and S. volgensis, in Lake Balaton. - Hydrobiologia, 549: 115-130.

Specziár, A. (2005). Feeding strategy, trophic relatinships, growth andsurvival of juveniles of native fish species in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2004, Hungarian Academy of Sciences, Budapest, pp. 102-110. (In Hungarian)

Specziár, A. (2005) First year cohort dynamics and ontogenetic diet patterns of some common fishes in Lake Balaton. - Hidrológiai Közlöny, 85: 124-126. (In Hungarian)

Sváb, E., Tyler, A.N., Preston, T., Présing, M. & V.-Balogh, K. (2005) Characterisation the spectral reflectance of algae in lake waters with high suspended sediment concentration. - Int. J. Remote Sensing, 26: 919-928.

Szűcs, A., Abarbanel, H.D., Rabinovich, M.I. & Selverston, A.I. (2005) Dopamine modulation of spike dynamics in bursting neurons. - Eur. J. Neurosci., 21: 763-772.

Tátrai, I., György, Á., Józsa, V. & Szabó, I. (2005a) The effect and biological role of silver carp in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2004, Hungarian Academy of Sciences, Budapest, pp. 93-101. (In Hungarian)

Tátrai, I., Specziár, A., Bíró, P. & Guti, G. (2005b) Hydroacoustic fish stock assessment in shallow ecosystems and its relation to CPUE-catches. - Hidrológiai Közlöny, 85: 141-144. (In Hungarian)

Tátrai, I., Mátyás, K., Korponai, J., Szabó, G., Pomogyi, P. & Héri J. (2005) Response of Nutrients, Plankton Communities and Macrophytes to Fish Manipulation in a Small Eutrophic Wetland Lake. - International Review of Hydrobiology, 90: 511-522.

Tóth, N., Szentes, G. & V.-Balogh, K. (2005) Effect of photochemical and bacterial degradation on quality of dissolved organic substances. - Hidrológiai Közlöny, 85: 155-157. (In Hungarian)

Varga, É., Tóth, Á.P., Muskó, I.B. & Lakatos, Gy. (2005) Spatial structure of the epilithon after rising of water level in Lake Balaton. - Hidrológiai Közlöny, 85: 161-162. (In Hungarian)

V.-Balogh, K., Tóth, N. & Vörös, L. (2005) Effect of meteorological and hidrological changes on the role of organic(humic) substances in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2004, Hungarian Academy of Sciences, Budapest, pp. 46-55. (In Hungarian)

Vehovszky, Á., Agricola, H.-J., Elliott, C.J.H., Ohtani, M., Kárpáti, L. & Hernádi, L. (2005) Crustacean cardioactive peptide (CCAP)-related molluscan peptides (M-CCAPs) are potential extrinsic modulators of the buccal feeding network in the pond snail Lymnaea stagnalis. - Neurosci. Lett., 373: 200-205.

Vehovszky, Á., Szabó, H. & Elliott, C.J.H. (2005) Octopamine increases the excitability of neurons in the snail feeding system by modulation of inward sodium current but not outward potassium currents. - BMC Neuroscience, 6: 70.

Vörös, L., Kovács, A., Mózes, A., Bányász, D. & Németh, B. (2005) Role and regulating factors of the planctonic and the bentic algal communities in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2004, Hungarian Academy of Sciences, Budapest, pp. 7-15. (In Hungarian)

Vörös, L., V.-Balogh, K. & Boros, E. (2005) Picoplankton predominance in soda lakes. - Hidrológiai Közlöny, 85: 166-168. (In Hungarian)

Zsigó, K., Tóth, A., Vörös, L. & Teszárné Nagy, M. (2005) Data sampling of the new methods of direct epifluorescens microscopic quantifying of water bacteria. - Hidrológiai Közlöny, 85: 180-182. (In Hungarian)

2006

Balogh, Cs. & B. Muskó, I. (2006) Filtration of zebra mussels and their effect on the environment in Lake Balaton (Hungary). - Hidrológiai Közlöny, 86: 10-12. (In Hungarian)

Balogh, E. & Takács, P. (2006) Comparison of estimated material fowing in 2003/2004 on the Lónyai-main-channel watersystem. - Hidrológiai Közlöny, 86: 13-15. (In Hungarian)

Bányász, D. & Vörös, L. (2006) Living diatoms in the deep sediment layers of Lake Balaton. - Hidrológiai Közlöny, 86: 16-17. (In Hungarian)

Bodó, I. & Specziár, A. (2006) Results of tench marking in Lake Balaton. - Halászat, 99: 57-59. (In Hungarian)

G.-Tóth, L. (2006) Dive to the world of the silence. - A Földgömb, Journal of the Hungarian Geographical Society, 26: 20-29. (In Hungarian)

György, Á.I., Tátrai, I., Bíró, P. & Pintér, Z.Sz. (2006) Comparative surveys of fish communities in the Kis-Balaton Water Protection Reservoir. - Hidrológiai Közlöny, 86: 85-87. (In Hungarian)

György, Á.I., Tátrai, I., Bíró, P. & Pintér, Z.Sz. (2006) Comparative surveys of fish communtities in the Kis-Balaton Water Protection Reservoir. - Extended Abstract, the 5th International Conference on Reservoir Limnology and Water Quality, Brno, p. 205-208.

Harka, Á. & Bíró, P. (2006) Recent distribution of Ponto-Caspic fish species in Central Europe. - Halászat, 99: 33-41. (In Hungarian)

Herodek, S., Hiripi, L., Shafik, H.M., Filla, A. & Leitold, H. (2006) Phosphorus metabolism of the microbial plankton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2005, Hungarian Academy of Sciences, Budapest, pp. 16-25. (In Hungarian)

Homonay, Z.G., Kéki, Zs., G.-Tóth, L. & Tóth, E. (2006) Cultured bacterial communities of planktonic crustaceans (Daphnia cucullata, Eudiaptomus gracilis) of Lake Balaton. - Hidrológiai Közlöny, 47: 51-53. (In Hungarian)

Kenesi, Gy., Présing, M., Shafik, H.M. & Kovács, W.A. (2006) Nitrogen uptake and fixation of Cylindrospermopsis raciborskii cyanobacteria in phosphorous-limited chemostats. - Hidrológiai Közlöny, 86: 56-59. (In Hungarian)

Kenesi, Gy., Présing, M., Shafik, H.M., Kovács, W.A. & Herodek, S. (2006) Nitrogen demand of phytoplankton and the significance of several nitrogen sources of Lake Balaton III. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2005, Hungarian Academy of Sciences, Budapest, pp. 26-35. (In Hungarian)

Kiss, T. & Pirger, Zs. (2006) Neuropeptides as modulators and hormones in terrestrial snails: Their occurence, distribution and physiological significance. - Part 4. Transword Research Network, (ISBN: 81-7895-224-6), Invertebrates neuropeptides and hormones: Basic knowledge and recent advances; Ed: Honoo Satake. Transworld Research Network, Fort. P. O., Trivandrum-695 023, Kerala, India, pp. 75-110.

Kovács, N., Borbély, G., Magyar, I., Szép, Zs., Paulovits, G. & Pomogyi, P. (2006) Assessment of spatial distribution of sediment toxicity in the Kis-Balaton Water Protection System II. - Acta Agraria Kaposvariensis, 2006/1: 43-52. (In Hungarian)

Kovács, T., Ács, A., Kovács, N., Lugosi, Sz., Refaey, M. & Paulovits, G. (2006) Non-conventional ecotests for assessing cyanobacterial toxicity. - National Environmental Conference, MTESZ Veszprém, 2006. pp. 272-276. (In Hungarian)

Kovács, T., Ács, A., Kovács, N., Lugosi, Sz., refaey, M. & Paulovits, G. (2006) assessing cyanobacterial toxicity in the Kis-Balaton Water Protection System (Hungary). - Cyanobacterial water blooms, effects, consequences and management. Brno 2006. pp. 47.

Kovács, W.A., Szalontai, K., Üveges, V., Présing, M. & Vörös, L. (2006) Light and temperature dependence of photosynthesis of Cladophora in Lake Balaton (Hungary); comparison of methods. - Hidrológiai Közlöny, 86: 69-72. (In Hungarian)

Koza, A., Wilhelm, M., Hiripi, L., Elekes, K. & Csoknya, M. (2006) Embryogenesis of the serotonerg system in the earthworm Eisenia fetida (Annelida, Oligocheta): Immunohistochemical and biochemical studies. - J. Comp. Neurol., 497: 451-467.

Lakatos, Gy., Ács, É., Kiss, M.K., Varga, É. & Bíró, P. (2006) Ecological classification of epilithon in two shallow lakes in Hungary. - Verh. Internat. Verein. Limnol., 29: 1782-1784.

Móra, A., Juhász, P., Kiss, B. & Müller, Z. (2006) Faunistical results of the Trichoptera investigations carried out in the frames of the ecological survey of the surface waters of Hungary (ECOSURV) in 2005. - Folia Hist.-Nat. Mus. Matr., 30: 359-367.

Móra, A., Tóth, M., Debreceni, Á. & Csépes, E. (2006) Contribution to the chironomid fauna (Diptera: Chironomidae) of the Upper-Tisza, NE Hungary. - Folia Hist.-Nat. Mus. Matr., 30: 253-261. (In Hungarian)

Mózes, A., Présing, M. & Vörös, L. (2006) Seasonal dynamics of picocyanobacteria and picoeucaryotes in a large shallow lake (Lake Balaton, Hungary). - Int. Rev. Hydrobiol., 91: 38-50.

Muskó, I.B., Balogh, Cs., Tóth, Á.P., Varga, É. & Lakatos, Gy. (2006) Seasonal changes of Malacostraca in the stony littoral zone of Lake Balaton due to the water level change (2003-2004). - Hidrológiai Közlöny, 86: 7-9. (In Hungarian)

Muskó, I.B., Balogh, Cs. & Kiszely, P. (2006) Study of the invertebrates living in the encrustations of the littoral zone, and the Decapoda in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2005, Hungarian Academy of Sciences, Budapest, pp. 57-65. (In Hungarian)

Nikitin, E.S., Kiss, T., Staras, K., O`Shea, M., Benjamin, P.R. & Kemenes, G. (2006) Persistent sodium current is a target for cAMP-induced neuronal plasticity in a state-setting modulatory interneuron. - J. Neurophysiol., 95: 453-463.

Nowotny, T., Szűcs, A., Pinto, R.D. & Selverston, A.I. (2006) StdpC: A modern dynamic clamp. - J. Neurosci. Methods, 158: 287-299.

Palatka, K., Serfőző, Z., Veréb, Z., Bátori, R., Lontay, B., Hargitay, Z., Nemes, Z., Udvardy, M., Erdődi, F. & Altorjay, I. (2006) Effect of IBD sera on expression of inducible and endothelial nitric oxide synthase in human umbilical vein endothelial cells. - World J. Gastroenterol., 12: 1730-1738.

Pálffy, K. & Vörös, L. (2006) Effects of UV-A radiation on Scenedesmus armatus: changes in growth rate, pigment content and morphological appearance. - Int. Rev. Hydrobiol., 91: 451-465.

Paulovits, G., Borbély, G., Kovács, N., Magyar, I. & Pomogyi, P. (2006) Assessment of external load carried by small watercourses in the Kis-Balaton Water Protection System, II. phase. - Hidrológiai Közlöny, 86: 82-84. (In Hungarian)

Pintér, Z.Sz., Tátrai, I. & György, Á.I. (2006) Survey of the activity of fish population in Kis-Balaton Water Protection Reservoir by radio telemetry. - Extended Abstract, the 5th Internatiol Conference on Reservoir Limnology And Water Quality, Brno, 226-242.

Pirger, Zs., Elekes, K. & Kiss, T. (2006) Electrical properties and cell-to cell communication of the salivary gland cells of the snail, Helix pomatia. - Comp. Biochem. Physiol. A, 145: 7-19.

Pirger, Zs., László, Z. & Kiss, T. (2006) G-protein coupled receptor kinase-like immunoreactivity in the snail, Helix pomatia, neurons. - Brain Res., 1122: 10-17.

Ponyi, J. & P. Zánkai, N. (2006) Zoological studies on the River Zala III. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2005, Hungarian Academy of Sciences, Budapest, pp. 66-72. (In Hungarian)

Ponyi, J. (2006) Changes of the crustacean fauna in the last decade (2006). - Hidrológiai Tájékoztató, p. 33. (In Hungarian)

Présing, M. (2006) Nitrogen cycle of Lake Balaton. - Regional Centre of the Hungarian Academy of Sciences, Veszprém (VEAB), ISSN 1785-8763, 101-110. (In Hungarian)

Rezsu, E. & Specziár, A. (2006) Ontogenetic diet profiles and size-dependent diet partitioning of ruffe Gymnocephalus cernuus, perch Perca fluviatilis and pumpkinseed Lepomis gibbosus in Lake Balaton. - Ecol. Freshwat. Fish., 15: 339-349.

Schmera, D. & Erős, T. (2006) Scale dependent estimation of species richness: a case study with caddisflies. - Acta. Biol. Debr. Oecol. Hung., 14: 205-210. (In Hungarian)

Schmera, D. & Erős, T. (2006) Estimating sample representativeness in a survey of stream caddisfly fauna. - Annales de Limnologie - Int. J. Limn., 42: 181-187.

Somogyi, B. & Vörös, L. (2006) Photosynthetic parameters of picoplankton in shallow lakes. - Hidrológiai Közlöny, 86: 110-112. (In Hungarian)

Specziár, A. (2006) Feeding strategy, trophic relationships, growth and survival of juveniles of native fish species in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2005, Hungarian Academy of Sciences, Budapest, pp. 84-92. (In Hungarian)

Szabó, G., Borsodi, A., Márialigeti, K., Tátrai, I., & Dévai, Gy. (2006) Foszfatáz aktivitást mutató és polifoszfátot felhalmozó baktériumfajok vizsgálata sekély vízterekben. - Hidrológiai Közlöny, 86: 116-119. (In Hungarian)

Szűcs, A. & Selverston, A.I. (2006) Consistent dynamics suggests tight regulation of biophysical parameters in a small network of bursting neurons. - J. Neurobiol., 66: 1584-1601.

Tátrai, I., Korponai, J., Mátyás, K., Pomogyi, P., Havasi, M. & Kucserka, T. (2006) Importance of the phytoplankton biomass in shallow wetland lake with abundant submerged vegetation as a part of the water qualitiy reservoir. - Extended Abstract, the 5th Internatiol Conference on Reservoir Limnology And Water Quality, Brno, p. 238-242.

Tátrai, I., Józsa, V., György, Á., Havasi, M. & Szabó, I. (2006) The biological effect of silver carp in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2005, Hungarian Academy of Sciences, Budapest, pp. 73-83. (In Hungarian)

Tóth, M., Móra, A. & Dévai, Gy. (2006) Faunistical investigation on non-biting midges (Diptera: Chironomidae) from backwaters at the Upper-Tisza region. - Acta biol. debrecina, Suppl. oecol. hung., 14: 245-251. (In Hungarian)

Tóth, N. & V.-Balogh, K. (2006) Effects of meteorological and hydrological factors on the temporal changes of the concentration of organic carbon fractions at the mouth of the River Zala in Hungary. - Hidrológiai Közlöny, 86: 130-132. (In Hungarian)

Tóth, N. & V.-Balogh, K. (2006) Meteorologic and hydrologic effects on the concentration of humic and nonhumic DOC fractions in a small river. - In: Proceedings of the 13th Meeting of the International Humic Substances Society. (Eds: Frimmel, F. H. & G. Abbt-Braun) 45 - II: 677-680.

Tyler, A.N., Sváb, E., Preston, T., Présing, M., & Kovács, W.A. (2006) Remote sensing of the water quality of shallow lakes: A mixture modelling approach to quantifying phytoplankton in water characterized by high-suspended sediment. - Int. J. Remote Sensing, 27: 1521-1537.

V.-Balogh, K., Présing, M. Vörös, L. & Tóth, N. (2006) A study of the decomposition of reed (Phragmites australis) as a possible source of aquatic humic substances by measuring the natural abundance of stable carbon isotopes - Int. Rev. Hydrobiol., 91: 15-28.

V.-Balogh, K., Tóth, N. Somogyi, B. & Vörös, L. (2006) Effect of meteorological and hidrological changes on the role of organic(humic) substances in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2005, Hungarian Academy of Sciences, Budapest, pp. 36-44. (In Hungarian)

V.-Balogh, K., Tóth, N., Somogyi, B. & Vörös, L. (2006) Biological availability of allochthonous dissolved organic substances in tributaries of Lake Balaton in Hungary. - Hidrológiai Közlöny, 86: 133-135. (In Hungarian)

V.-Balogh, K., Vörös, L., Kovács, A.W. & Tóth, N. (2006) The formation of hydrogen peroxide by the photodegradation of chromophoric organic substances in fresh waters. - In: (Frimmel, F. H. & Abbt-Braun, G. eds.) Proc. 13th Meeting Int. Humic Substances Soc. 45-II: 909-912.

Veres, S., Tóth, V.R., Láposi, R., Oláh, V., Lakatos, G. & Mészáros, I. (2006) Carotenoid composition and photochemical activity of some sandy grassland species. - Photosynthetica, 44: 255-261.

Vörös, L., Boros, E., Schmidt, A., V.-Balogh, K., Németh, B., Somogyi, B. & Mózes, A. (2006) Physical and chemical environment of phytoplankton in soda pans having white coloured water. - Hidrológiai Közlöny, 86: 139-141. (In Hungarian)

Vörös, L., Somogyi, B., V.-Balogh, K. & Németh, B. (2006) Role and regulating factors of the planctonic and the bentic algal communities in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2005, Hungarian Academy of Sciences, Budapest, pp. 7-15. (In Hungarian)

Vörös, L., V.-Balogh, K. & Tóth, N. (2006) The attenuation of solar ultraviolet radiation in shallow waters - the role of chromophoric organic substances. - In: (Frimmel, F. H. & Abbt-Braun, G. eds.) Proc. 13th Meeting Int. Humic Substances Soc. 45-II: 673-676.

2007

Balogh, A. & G.-Tóth, L. (2007) Selective predation of early bleak (Alburnus alburnus L.) larvae on zooplankton in Lake Balaton, Hungary. - Hidrológiai Közlöny, 87: 5-8. (In Hungarian)

Balogh, Cs., Muskó, I.B., Zámbóné Doma, Zs. & Padisák, J. (2007) The quantitative trend and the effect of zebra mussel on carbon and nitrogen flux in Lake Balaton (Hungary). - Hidrológiai Közlöny, 87: 11-13. (In Hungarian)

Baranyai, E. & G.-Tóth, L. (2007) Influence of the turbulence of the shalow of Lake Balaton on the vertical distribution of the pelagic zooplankton. - Hidrológiai Közlöny, 87: 14-16. (In Hungarian)

Bányász, D. & Vörös, L. (2007) Vertical migration of phytobenthos in Lake Balaton. - Hidrológiai Közlöny, 87: 19-21. (In Hungarian)

Bereczki, Cs. & Takács, P. (2007) Morphometrical researches on the stocks of characteristic fishspecies in the tributaries of Lake Balaton. - Hidrológiai Közlöny, 87: 22-24. (In Hungarian)

Bereczki, Cs. & Takács, P. (2007) Morphometrical research of the characterspecies of the Bükkalja region`s little rivers. - Acta Agraria Debreceniensis (Suppl. Pisces Hungrici II.), 26: 149-157. (In Hungarian)

Bíró, P. (2007) The Balaton Limnological Research Institute of the Hungarian Academy of Science is 80 years old: Past, presence and future. - Hidrológiai Tájékoztató, 14-16. (In Hungarian)

Csépes, E., Móra, A., Tóth, M., Aranyné Rózsavári, A., Bancsi, I. & Kovács, P. (2007) Faunistical results of investigations concerning to benthic chironomid assemblages in Kisköre Reservoir. - Hidrológiai Közlöny, 87: 61-63. (In Hungarian)

Erős, T.(2007) Partitioning the diversity of riverine fish: the roles of habitat types and non-native species. - Freshwater Biology, 52: 1400-1415.

Farkas, A., Vigano, L. & Eratico, C. (2007) Assessment of the environmental significance of heavy metal pollution in surficial sediments of the River Po. - Chemosphere, 68: 761-768.

Farkas, A., Kovács, W.A., Gácsi, M., Győri, J. & Vehovszky, Á. (2007) The toxicity assessment of cyanobacteria by the Artemia salina acute toxicity assay. - Hidrológiai Közlöny, 6: 28-30. (In Hungarian)

Farkas, A., Kovács, W.A., Paulovits, G. & Vehovszky, Á. (2007) Analysis of the toxicity of the cyanobacteria of Lake Balaton and Kis-Balaton Reservoir. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2006, Hungarian Academy of Sciences, Budapest, pp. 130-138. (In Hungarian)

G.-Tóth, L. (2007) Trip to the deep sea oases by bathyscaphe. - Természetbúvár, 62: 28-31. (In Hungarian)

G.-Tóth, L., Poikane, S., Fraa, G., Penning, E., Maemets, H., Kolada, A. & Hanganu, J. (2007) Comparison of different macrophyte based assessment methods within the Lakes-Central/Baltic GIG. - Hidrológiai Közlöny, 87: 51-54. (In Hungarian)

György, Á.I., Tátrai, I., Bíró, P. & Pintér, Z.Sz. (2007) Hydroacustic fish stock estimates and relations with gillnet catches in Lake Major. - Hidrológiai Közlöny, 87: 48-50. (In Hungarian)

Győri, J., Varró, P., Zielinsk, E., Banczerowsky-Pelyhe, I. & Világi, I. (2007) Bensultap inhibits the efficacy of synaptic transmission both in molluscan and mammalian central nervous system. - Toxicology in Vitro, 21: 1050-1057.

Harka, Á. & Bíró, P. (2007) New patterns in Danubian distribution of Ponto-Caspian gobies - a result of global warming and/or canalization? - Electronic Journal of Ichthyology, 3: 1-14.

Hatakeyama, D., Aonuma, H., Ito, E. & Elekes, K. (2007) Localization of glutamate-like immunoreactive neuron sin the central and peripheral nervous system of the adult and developing pond snail, Lymnaea stagnalis. - Biol. Bull., 213: 172-186.

Havasi, M., Tátrai, I. & Kucserka, T. (2007) Changes in length and fecundity of the dominant Cladocera species in the Kis-Balaton Water Protection Reservoir. - Hidrológiai Közlöny, 87: 64-66. (In Hungarian)

Hernádi, L., Vehovszky, Á., Győri, J. & Hiripi, L. (2007) Neuronal background of activation of estivated snails, with special attention to the monoaminergic system: a biochemical, physiological and neuroanatomical study. - Cell. Tiss. Res., 331: 539-553.

Herodek, S., Megyer, Cs., Futó, J. & Tardy, J. (2007) Balaton. - In: Tardy, J. (ed.) The World of Hungarian Wetlands. - Ramsari areas in our contry, Pécs: Alexandra, pp. 354-369. (In Hungarian)

Herodek, S., Hiripi, L., Shafik, H.M., Filla, A. & Leitold, H. (2007) Phosphorus metabolism of the microbial plankton II. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2006, Hungarian Academy of Sciences, MTA, Budapest, pp. 16-26. (In Hungarian)

Hunter, P., Tyler, A., Présing, M., Kovács, W.A. & Preston, T. (2007) Spectral discrimination of phytoplankton colour groups: the effect of suspended matter and sensor spectral resolution on the potential derivation of taxonomic information from remote sensing data. - Remote Sensing of Environment.

Istvánovics, V., Clement, A., Somlyódy, L., Specziár, A., G.-Tóth, L. & Padisák, J. (2007) Updating water quality targets for shallow Lake Balaton (Hungary), recovering from eutrophication. - Hydrobiologia, 581: 305-318.

Jeppesen, E., Sondergaard, M., Lauridsen, T.L., Kronvang, B., Beklioglu, M., Lammens, E., Köhler, J., Vantelä, A-M., Tarvainen, M. & Tátrai, I. (2007) Danish and some other European experiences in managing shallow lakes. - Lake and Reservoir Management, 23: 439-451.

Kenesi, Gy., Présing, M., Shafik, H.M., Kovács, W.A. & Herodek, S. (2007) Investigating the effects of inorganic N-forms on the growth N2-fixation and cell composition of Cylindrospermopsis raciborskii in phosphorous-limited chemostats. - Hidrológiai Közlöny, 87: 76-79. (In Hungarian)

Kovács, T., Ács, A., Kováts, N. & Paulovits, G. (2007) Inhibition of feeding activity in Daphnia pulex by cyanobacterial toxicity. - Hidrológiai Közlöny, 87: 25-28. (In Hungarian)

Kovács, W.A. & Vörös, L. (2007) Changes of akinete number of N2-fixing cyanobacteria determined by epifluorescence microscope in Lake Balaton (Hungary). - Hidrológiai Közlöny, 87: 86-89. (In Hungarian)

Kovács, W.A., Felföldi, T., Saker, M.L. & Gácsi, M. (2007) Moleculra investigations on the cylindrospermopsin producing potential of Cylindrospermopsis raciborskii (Nostocales, Cyanobacteria). - Hidrológiai Közlöny, 87: 83-86. (In Hungarian)

Kucserka, T., Tátrai, I. & Havasi, M. (2007) Effect of fish communities on macrozoobenthos dynamics in the Kis-Balaton Water Protection Reservoir. - Hidrológiai Közlöny, 87: 93-95. (In Hungarian)

Leitold, H., Présing, M., Kovács, W.A. & Shafik, H.M. (2007) Growth of Cylindrospermopsis raciborskii with different N supply. - Hidrológiai Közlöny, 87: 96-98. (In Hungarian)

Lohner, R.N., Sigler, W.V., Mayer, C.M. & Balogh, Cs. (2007) A comparison of the benthic microbial community within and surrounding Dreissena clusters in lakes. - Microbial Ecology, 54: 469-477.

Lukács, V., Bisztray, Gy. & Herodek, S. (2007) Genetic diversity of reeds of Lake Balaton. - Hidrológiai Közlöny, 87: 99-101. (In Hungarian)

Lukács, V., Bisztray, Gy. & Herodek, S. (2007) Studies into the clonal diversity of three different reed stands by PCR-RAPD. - In: Tavaszi Szél, Budapest, Zrínyi Miklós National Defence University: Conference Proceedings, pp. 258-263. (In Hungarian)

Móra, A., Barnucz, E., Boda, P., Csabai, Z., Cser, B., Deák, Cs. & Papp, L. (2007) On the macroinvertebrate fauna of inflows of Lake Balaton. - Acta Biol. Debrecina, Suppl. Oecol. Hung., 16: 105-167. (In Hungarian)

Móra, A. & Bíró, K. (2007) Chironomidae (Diptera) from Hungary 4. Larvae from inflows of Lake Balaton. - Acta Biol. Debrecina, Suppl. Oecol. Hung., 16: 169-174. (In Hungarian)

Móra, A., Tóth, M., Debreceni, Á. & Takács, P. (2007) Investigations on the chironomid fauna of streams in the catchment area of Lake Balaton: preliminary results. - Hidrológiai Közlöny, 87: 171-174. (In Hungarian)

Mózes, A., Kiss, B. & Vörös, L. (2007) Low abundance of picoplankton in rivers. - Hidrológiai Közlöny, 87: 101-103. (In Hungarian)

Móra, A. (2007) Investigations on the macrozoobenthos of inflows of Lake Balaton in the frame of the EU WFD. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2006, Hungarian Academy of Sciences, MTA, Budapest, pp. 99-108. (In Hungarian)

Muskó, I.B., Balogh, Cs. & G.-Tóth, L. (2007) The amount of the fish food (invertebrates) in the littoral zone of Lake Balaton. - Hidrológiai Közlöny, 87: 5-7. (In Hungarian)

Muskó, I.B., Balogh, Cs., Tóth, Á.P., Varga, É. & Lakatos, Gy. (2007) Differential response of invasive malacostracan species to lake level fluctuations. - Hydrobiologia, 590: 65-74.

Muskó, I.B. & Balogh, Cs. (2007) Study of the invertebrates living in the encrustations of the littoral zone in Lake Balaton in 2006. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2006, Hungarian Academy of Sciences, MTA, Budapest, pp. 66-74. (In Hungarian)

Nédli, J., Forró, L., Korponai, J. & G.-Tóth, L. (2007) Daphnia species (Crustacea, Cladocera) and genetic characteristics of their populations based on alloenzyme studies in Lake Balaton, Hungary. - Opusc. Zool. Budapest, 36: 79-84.

Nowotny, T., Szűcs, A., Levi, R. & Selverston, A.I. (2007) Models wagging the dog: Are circuits constructed with disparate parameters? - Neural Computation, 19: 1985-2003.

Oertel, N., Nosek, J. & Ponyi, J. (2007) Meiofauna investigations in the hyporheic zone of the River Danube. - Acta Biologica Debrecina. Supplementum Oecologica Hungarica, 16: 175-186. (In Hungarian)

Paulovits, G., Borbély, G., G.-Tóth, L. & Kováts, N. (2007) Effects of water level fluctuation on reproduction and spawning habits of fish species in Lake Balaton. - Environmental Engineering and Management Journal, 6: 467-471.

Paulovits, G., Borbély, G. & Staszny, Á. (2007) Effects of water level fluctuation on reproduction and spawning habits of fish species in Lake Balaton. - Acta Agraria Kaposváriensis, 11: 1-9. (In Hungarian)

Pintér, Z.Sz., Tátrai, I. & György, Á.I. (2007) Survey of moving activity of the fish population at Kis-Balaton Water Protection Reservoir by radiotelemetry in 2005-2006. - Hidrológiai Közlöny, 87: 104-106. (In Hungarian)

Pintér, Z.Sz., Tátrai, I. & György, Á.I. (2007) Survey of moving activity of the fish population in Kis-Balaton Water Protection Reservoir by radiotelemetry. - Hidrológiai Közlöny, 87: 107-109. (In Hungarian)

Ponyi, J. (2007) Research of hyporeic zone of Hungarian water streams. - V. Biological Symposium of the Carphatian Basin, MBT, pp. 321-324. (In Hungarian)

Ponyi, J. (2007) Some reflection from zoobenthos in Lake Balaton. - Hidrológiai Tájékoztató, 45-46. (In Hungarian)

Présing, M., Kenesi, Gy., Shafik, H.M., Kovács, W.A. & Herodek, S. (2007) Growth of Cylindrospermopsis raciborskii nitrogen-fixing blue-green algae on different nitrogen sources. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2006, Hungarian Academy of Sciences, MTA, Budapest, pp. 27-36. (In Hungrian)

Refaey, M., Ács, A., Kovács, T., Kováts, N. & Paulovits, G. (2007) Novel ecotoxtest based on Daphnia pulex feeding inhibition. - International Conference of PhD Students, University of Miskolc, Innovation and Technology Transfer Centre, Natural Science, pp. 237-242.

Sályi, P., Erős, T., Takács, P., Bereczki, Cs. & Bíró, P. (2007) Changes of structure of fish assemblages in three northern inflows of Lake Balaton. - Acta Agraria Debreceniensis (Suppl. Pisces Hungarici II.), 26: 101-116. (In Hungarian)

Schmera, D., Erős, T. & Greenwood, M.T. (2007) Spatial organization of a shredder guild of caddisflies (Trichoptera) in a riffle - searching for the effect of competition. - Limnologica, 37: 129-136.

Schmidt, A., Fehér, G., Boros, E. & Vörös, L. (2007) Changes in salinity and phytoplankton of Lake Szelid. - Hidrológiai Közlöny, 87: 112-114. (In Hungarian)

Serfőző, Z., & Elekes, K. (2007) Histochemistry of the extracellular matrix in the snail nervous system. - Clinical Neuroscience/Idegtudományi Szemle, 60: 173-176.

Serfőző, Z., Szentmiklósi, J.A. & Elekes, K. (2007) Characterization of NOergic neurons in the alimentary tract of the snail, Helix pomatia L. A histochemical and physiological study. - J. Comp. Neurol., 506: 806-821.

Serfőző, Z., B. Kiss, P., Kukor, Z., Lontay, B., Palatka, K., Varga, V., Erdődi, F. & Elekes, K. (2007) Thyroid hormones affect the level and activity of nitric oxide synthase in rat cerebral cortex during postnatal development. - Neurochemical Research, 33: 569-578.

Somogyi, B., Vanyovszki, J., Ágyi, Á. & Vörös, L. (2007) Comparative study of the photosynthesis of eukaryotic and prokaryotic picoalgal strains. - Hidrológiai Közlöny, 87: 119-121. (In Hungarian)

Specziár, A. (2007) Ontogenetic diet shifts and their effects on growth rate and diet partitioning of fish in Lake Balaton. - In: Fenyvesi, O. (ed.), Scientific presentations 2007. MTA VEAB, Veszprém, pp. 127-135.

Specziár, A. & Turcsányi, B. (2007) Spreading, growth and recapture of stocked common carp (Cyprinus carpio) and pikeperch (Sander lucioperca) in Lake Balaton. - Halászat, 100: 98-108. (In Hungarian)

Specziár, A., Bíró, P. & Tátrai, I. (2007) Fish stocks of our lakes in the distorted mirror of the EU WFD. - Hidrológiai Közlöny, 87: 156-158. (In Hungarian)

Specziár, A. & Takács, P. (2007) Fish stock monitoring according to the EU WFD in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2006, Hungarian Academy of Sciences, MTA, Budapest, pp. 89-98. (In Hungarian)

Staszny, Á. & Paulovits, G. (2007) Growth analysis of razor fish (Pelecus cultratus L.) in Lake Balaton. - Hidrológiai Közlöny, 87: 122-123. (In Hungarian)

Stomp, M.J., Huisman, L., Vörös, L., Pick, F.R., Laamanen, M., Haverkamp, T. & Stal, L.J. (2007) Colorful coexistence of red and green picocyanobacteria in lakes and seas. - Ecology Letters, 10: 290-298.

Szító, A., Ponyi, J. & Reskóné Nagy, M. (2007) Zooplankton, meio- and makrozoobenthos investigations in Lake Velecei and their importance in the estimation of the state of the lake. - Hidrológiai Közlöny, 87: 131-134. (In Hungarian)

Szűcs, A. (2007) Artificial synapses in neuronal networks. - In: Neuronal Synapse Research, Columbus, F. (ed.), Nova Science Publishers, Hauppauge, NY, USA, pp. 47-96.

Takács, P. (2007) Comparative study of wold and lowland situated small watercourses from fishbiological aspect. - Acta Agraria Debeceniensis (Suppl. Pisces Hungarici I.), 25: 54-59. (In Hungarian)

Takács, P., Bereczki, Cs., Sály, P., Móra, A. & Bíró, P. (2007) Fish biological research on small inflows of Lake Balaton. - Hidrológiai Közlöny, 87: 175-178. (In Hungarian)

Tátrai, I., Józsa, V., György, Á., Boros, G. & Héri, J. (2007) The biological effect of silver carp in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2006, Hungarian Academy of Sciences, MTA, Budapest, pp. 75-88. (In Hungarian)

Tóth, N., Vörös, L., Mózes, A. & V.-Balogh, K. (2007) Biological availability and humic properties of dissolved organic carbon in Lake Balaton (Hungary). - Hydrobiologia, 592: 281-290.

Tóth, V. (2007) Morphometric comparison of reed stands from northern and southern shoreline of Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2006, Hungarian Academy of Sciences, MTA, Budapest, pp. 57-65. (In Hungarian)

Triebskorn, R., Telcean, I., Casper, H., Farkas, A., Sandu, C., Stan, G., Colaresču, O., Dori, T. & Köhler, H. (2007) Monitoring pollution in River Mures, Romania, Part II: Metal accumulation and histopathology in fish. Environmental Monitoring and Assessment (on-line publikáció; DOI: 10.1007/s10661-007-9886-9).

Üveges, V., Kovács, W.A., Tóth, V., Padisák, J. & Vörös, L. (2007) Incubation system for estimation the photosynthesis-irradiance parameters of benthic algae. - Hidrológiai Közlöny, 87: 144-147. (In Hungarian)

Vári, Á. & Szövényi, G. (2007) Populationsentwicklung und Mobilität von Poecilimon brunneri Frivaldszky, 1867 im Gödöllőer Hügelland in Ungarn. - Articulata, 22: 17-31.

Vári, Á. & Szövényi, G. (2007) The habitat requirements of Poecilimon brunneri Frivaldszky, 1867 Orthoptera: Phaneropteridae) and its Hungarian occurrence. - Opuscula Zoologica Budapest, 36: 97-102.

V.-Balogh, K., Tóth, N., Somogyi, B. & Vörös, L. (2007) Biologically available organic carbon load of Lake Balaton. - Hidrológiai Közlöny, 87: 147-149. (In Hungarian)

V.-Balogh, K. & Vörös, L. (2007) Role of autochthonous and allochthonous organic substances in water quality in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2006, Hungarian Academy of Sciences, MTA, Budapest, pp. 37-45. (In Hungarian)

Vehovszky, Á., Szabó, H., Hiripi, L., Elliott, C.J.H. & Hernádi, L. (2007) Behavioural and neural deficits induced by rotenone in the pond snail Lymnaea stagnalis. An invertebrate model for Parkinson's disease? - European J. Neurosci., 25: 2123-2130.

Veres, S., Tóth, V.R., Láposi, R., Oláh, V., Lakatos, G. & Mészáros, I. (2007) Carotenoid composition and photochemical activity of some sandy grassland species. - Photosynthetica, 44: 255-261.

Vörös, L., Somogyi, B., Bányász, D. & Németh, B. (2007) Role of regulating factors of the planctonic and the bentic algal communities in Lake Balaton. - In: Mahunka, S. & Banczerowski J. (eds.) Results of Lake Balaton Research in 2006, Hungarian Academy of Sciences, MTA, Budapest, pp. 7-15. (In Hungarian)

Wattier, R.A., Haine, E.R., Beguet, J., Martin, G., Bollache, L., Muskó, I.B., Platvoet, D. & Rigaud, T. (2007) No genetic bottleneck or associated microparasite loss in invasive populations of a freshwater amphipod. - Oikos, 116: 1941-1953.