Hidrológiai Közlöny 2009 (89. évfolyam)

6. szám - L. Hidrológiai Napok: "A hazai hidrobiológia ötven éve" Tihany, 2008. október 1-3.

62 HIDROLÓGIAI KÖZLÖNY 2009. 89. ÉVF. 6. SZ. B. F. Sherr, E. B. Sherr and J. J. Colé (Eds.): Handbook of methods in aquatic microbial ecology, Lewis Publishers, Boca Raton, Ann Arbor, London, Tokyo: pp. 187-197. Malinsky-Rushansky, N„ T. Berman & Z. Dubinsky (1995) Seasonal dynamics of picophytoplankton in Laké Kinneret, Israel. - Freshwater Biol. 34: 241-254. Pick, F. R. & D. M. Ágbeli (1991) The seasonal dynamic and composition photosynthetic picoplankton communities in temperate lakes in Ontario, Canada. - Int. Revue ges. Hydrobiol. 76: 565-580. Rippka, R., Deruelles, J., Waterbury, J.B., Herdman, M. & Stainer, R.Y. (1979). Generic assignments, strain histories and properties of pure cultures of cyanobacteria. —J. Gen. Microbiol., 111: 1-61. Somogyi, B., Felföldi, 7'., Vanyovszki, J., Agyi, A., Márialigeti, K. <£ Vörös, L. (2009) Winter bloom of picoeukaryotes in extremely shallow turbid soda lakes. - Aquat. Ecol. (in press) Takeda, H. (1991) Sugár composition of the cell wall and the taxonomy of Chlorella (Chlorophyceae). - J. Phycol. 27:224-232. Tamura, K„ Dudley, J„ Nei, M. & Kumar, S. (2007) MEGA4: Molecular Evolutionary Genetics Analysis (MEGA) software version 4.0. Mol. Biol. Evol. 24:1596-1599. Vaulot, D., Eikrem, W.. Viprey, M. & Moreau, H. (2008) The diversity of small eukaryotic phytoplankton (<3 jitn) in marine ecosystems. FEMS Microbiol. Rev. 32:1-26. Vörös, L. (1991) Importance of picoplankton in Hungárián shallow lakes. - Verh. Internat. Verein. Limnol. 24:984-988. Vörös, L., Boros, E„ Schmidt, A., V.-Balogh, K., Németh, B., Somogyi, B. & Mózes, A. (2006) A fitoplankton fizikai és kémiai környezete fehér vizű szikes tavainkban. - Hidrológiai Közlöny 86:139-142. Vörös, L„ Mózes, A. & Somogyi, B. (2009) A five-year study on the phototrophic winter picoplankton in a large shallow laké (Laké Balaton, Hungary) - Aquat. Ecol. (in press) Vörös, L., V.-Balogh, K. & Boros, E. (2005) Pikoplankton dominancia szikes tavakban. - Hidrológiai Közlöny 85:166-168. Wetzel, R.G. & G.E. Likens (1991) Limnological Analyses. 2nd Ed. Springer-Verlag New York. 391 pp. Yamamoto, M., Nozaki, H., Miyazawa , Y., Koide, T. & Kawano, S. (2003) Relationship between presence of a mother cell wall and speciation in the unicellular microalga Nannochloris (Chlorophyta). -J Phycol. 39:172-184. Unknown picoeukaryotic algae of shallow turbid soda lakes in the Danube-Tisza Interfluve B. Somogyi

1, T. Felföldi

2, K. Solymosi

2, J. Vanyovszki \ B. Böddi

2, K. Márialigeti

2, L. Vörös

1 'Balaton Limnological Institute, Tihany - 2Eötvös Loránd University, Budapest - 3University Babes-Bolyai, Cluj Abstract: Keywords: Autotrophic picoplankton show characteristic seasonal dynamics in temperate zone: picoeukaryotes dominate the picoplankton from autumn to spring while picocyanobacteria dominate it in summer. In winter the abundance of picoeukaryotic algae in shallow turbid soda lakes in the Danube-Tisza Interfluve (hypertrophic water bodies with picoplankton dominance) could reach extreme high values (in winter 2006/2007 it exceeded 10

8 cells ml"

1), however their taxonomic status is unknown. To get somé taxonomical information about the winter algae of these lakes, we isolated 13 picoeukaryotic algal strains from Böddi-szék pan and Zab-szék pan in December 2005. The reliable identification of such algal strains often requires molecular taxonomic methods because of their small size and simple morphology. Based on their 18S rDNA sequence analysis, all isolated strains belonged to the phylum Chlorophyta. Strains ACT0617 and ACT0619 belonged to group Pseudodictyosphaerium!Mychonastes, strains ACT0605 and ACT0610 belonged to the genus Choricystis. Strains ACT0608, ACT0622 and ACT0602 förmed a potentially new genus within the Trebouxiophyceae. The isolated strains were characterized by differential interference contrast microscopy and transmission electron microscopy. picoeukaryotic algal strains, shallow turbid soda lakes, 18S rDNS sequence analysis (Klossy Irén alkotása)