+   Attila Kovács - Research Fellow


Attila Kovács MSc, 
research fellow
Institute Building A, room 002
tel: +36 87 448244 ext №131
fax: +36 87 448006
kovacs.attilaemail_cim

CV
Research Area
Research Description
Major Projects
Travel, work abroad


  CV
PERSONAL INFORMATION
Birth:

29 07 1967, Békéscsaba, Hungary

Nationality:

Hungarian

Marital status:

two children

EDUCATION AND WORK-EXPERIENCE
1993-present

Balaton Limnological Research Institute of Hungarian Academy Sciences, Dep. of Hidrobiology
1993-1997: Investigation microbiological processing of phosphorus in Lake Balaton and Kis-Balaton reservoir
1997-present: Ecophysiology of Cyanobacteria, Cell culture, Microscopical techniques, Radioisotopic labelling techniques
2000-present: Importance of iron in Lake Balaton

1991- 1993

Biological Research Centre of Hungarian Academy of Sciences, Dep. of Plant Physiology
Signal transduction, G protein, DNA and RNA techniques (Hybridization, Sequencing, Southern and Northern blotting, Cloning techniques), Basic protein techniques

1986-1991

Attila József University, Faculty of Natural Sciences, Szeged, Hungary
Certificate: Research Biologist, M.Sc.

POSTGRADUATE TRAINING
1993

UNEP/ILEC International Training Course on Limnological Basis of Lake Management

MEMBERSHIP

Hungarian Hydrological Society
Hungarian Algological Society


  Research Area

Balaton, cyanobacteria, light–temperature interaction, akinete, iron availability


  Research Description

Lake Balaton (Hungary) is the largest shallow lake in Central Europe (between the northern latitudes 46 62’ and 47 04’, and between the eastern longitudes 17 15’ and 18 10’) that has a large surface area (596 km2 at mean level) and a mean depth is 3.25 m. The progressive eutrophication of the lake was perceived in the early seventies. In parallel with the accelerated eutrophication, the phytoplankton assemblage was observed to shift from eucaryotic algae (diatoms and dinoflagellates, especially Ceratium hirundinella) to a dominance of N2-fixing cyanobacteria. The appearance of new N2-fixing species was also observed. From 1975 to 1994 the development of summer blooms of N2-fixing cyanobacteria became a regular phenomenon in the western part and sometimes in the eastern part of the lake. In the western part of the lake the maximum chlorophyll-a concentration generally exceeded 100 µg l-1. During the latest bloom (1994) the whole water body of the lake was almost a pure culture of the cyanobacterium Cylindrospermopsis raciborskii (Woloszynska Seenayya et Subba Raju (95% of total phytoplankton biomass). Since 1995 the phytoplankton biomass, particularly N2-fixing cyanobacteria, has decreased dramatically, i.e. the maximum chlorophyll-a concentration has not exceeded 70 µg l-1. During this time the contribution of dinoflagellates to the phytoplankton biomass has increased again.

The N2-fixing cyanobacteria in Lake Balaton generally form planktonic populations for only one-three months a year otherwise they exist as akinetes accumulating in the surface layer of the lake sediment. Earlier studies have used indirect counting methods (the number of germinated filaments in the germination experiment) for the determination of akinete abundance in the sediment.

The aim of my study was 

(i) to develop a direct counting method for determine the abundance of akinetes in sediment

(ii) to determine the akinete abundance of C. raciborskii and the total akinete abundance of N2-fixing cyanobacteria in the sediment of Lake Balaton

(iii) to compare the data of available akinete abundance with the changes of the trophic state of Lake Balaton

(iv) to determine the interactive effects of temperature and light on growth, cell morphology, pigment composition, C:chlorophyll-a ratio, C:carotenoid ratio and C:N ratio composition of the most abundant cyanobacterum species (Cylindrospermopsis raciborskii, Aphanizomenon flos-aquae RALFS.) of Lake Balaton

(v) to determine the dynamics of different iron species (total iron, dissolved iron and biologically available iron [chelatable iron]) in Lake Balaton and in four inflows of the lake

(vi) to develop the easy molecular methods for proving of the iron limitation of the phytoplankton.


  Major Projects
  • 2002 Role of iron in algal development.
    (Principal investigator: Lajos Vörös)

  • 2002 Phytoplankton and phytobenthos in Lake Balaton. 
    (Principal investigator: Lajos Vörös)

  • 2001 Role of iron in algal development.
    (Principal investigator: Lajos Vörös)

  • 2001 Phytoplanktpn and phytobenthos in Lake Balaton. 
    (Principal investigator: Lajos Vörös)

  • 2000 Role of iron in algal development.
    (Principal investigator: Lajos Vörös)

  • 2000 Phytoplanktpn and phytobenthos in Lake Balaton. 
    (Principal investigator: Lajos Vörös)

  • 1999 Role of microbial communities in water quality formation of Lake Balaton. 
    (Principal investigator: Lajos Vörös)

  • 1998 Role of microbial communities in water quality formation of Lake Balaton. 
    (Principal investigator: Lajos Vörös)

  • 1997 Investigation of factors affecting growth and toxicity of blue-green algae. 
    (Principal investigator: Lajos Vörös)

  • 1996 Investigation of factors affecting growth and toxicity of blue-green algae. 
    (Principal investigator: Lajos Vörös)


  Travels, work abroad

University of Leipzig, Leipzig, Germany November-December 2001