Hidrológiai Közlöny 1999 (79. évfolyam)

4. szám - A Magyar Hidrológiai Társaság XVII. Országos Vándorgyűlése, Miskolc, 1999. július 7–8.

326 HIDROLÓGIAI KÖZLÖNY 1999. 79. ÉVF. 6. SZ. Köszönetnyilvánítás A munka a Környezetvédelmi Minisztérium és a Miniszterelnöki Hivatal anyagi támogatásával készült. Irodalom Albertano, P. (19%) Light and temperature responses of terrestrial sciaphilous strains of Leptolyngbya sp. in cross-gradient cultures. Algological Studies 83: 17-28. Gorzó, Gy. (1985) A Balaton üledékéből kitenyészthető planktonikus, heterocisztás cianobaktériumok. Hidrológiai Közlöny 65: 357-359. Herodek, S. (1986) Phytoplankton changes during eutrophication and P and N metabolism. In: Solyódi, L. and G. van Straten (eds) Modelling and Managing Shallow Laké Eutrophication. Springer-Verlag, Berlin 183-204. Hiripi, L„ A. Kovács, L. Vörös (1998) HPLC-s pigmentanalízis a fitoplankton diverzitásának vizsgálatában. Hidr. Közlöny 78: 296-297. Jbelings, A. W. (1996) Changes in photosynthesis in response to combined irradiance and temperature stress in cyanobacterial surface waterblooms. J. Phycology 32: 549-557. Jensen, S., G. Knutsen (1993) Influence of light and temperature on photoinhibition of photosynthesis in Spirulina platensis. Journal of Applied Phycology 5. 495-504. Kovács, A., E. Koncz, L. Vörös (1997) Nyári cianobaktérium populációk dominancia viszonyainak alakulása a fényintenzitás függvényében. Hidrológiai Közlöny 77, 14-16. Kovács, A., L. Hiripi, M. Présing, L Vörös (1998) A fény és a hőmérséklet együttes hatása a Cylindrospermopsis raciborskii (Wolosz) Seenayya et Subba Raju szaporodására és pigmentösszetételére. Hidrológiai Közlöny 78: 293-295. Padisák, J„ L. G.-Tóth, L. Vörös (1984) Anabaenopsis raciborskii Wolosz. bloom in Laké Balaton in the summer and autumn of 1982. BFB-Bericht 51:77-81 Présing, M„ S. Herodek, L. Vörös, I. Kóbor (1996) Nitrogén fíxation, ammónium and nitráté uptake during a bloom of Cylindrospermopsis raciborskii in Laké Balaton. Arch. Hydrobiol. 4. 553-562. Rippka, R., J. Deruelles, J. B. Waterbury, M. Herdman, R. Y. Stainer (1979) Thecianohactena. J. GeneralMicrobiol. III: 1-61. Schubert, H„ B. M. A. Kroon, H. C. P. Matthhijs (1994) In vivo manipulation of the xanthophyll cycle and the role of zeaxanthin in the protection against photodamage in the green alga Chlorella pyrenoidosa. J. Biol. Chem. 269: 7267-7272 Shqfik, H. M„ L. Vörös, M. Présing, A. Kovács, I. Kóbor (1997) A Cylindrospermopsis raciborskii szaporodásának jellegzetességei zárt és folyamatos tenyészetben Hidrológiai Közlöny 77: 17-18. Smith, V. H. (1986) Predicting the proportion of blue-green algae in laké phytoplankton. Can. J. Fish. Aquat. Sci. 43: 148-153. Yong, Y. Y. R., Y. L. Lee (1991) Do carotenoids play a photoprotective role in the cytoplasm of Haematococcus lacustris (Chlorophyta)? Phycologia 30: 257-261. Vörös, L„ É. Vizkeleti, F. Tóth, J. Németh (1983) Trofitás vizsgálatok a Balaton Keszthelyi-medencéjében 1979-ben. Hidrológiai Közlöny 63: 390-398. Vörös, L., P. Nagy Göde (1993) Long term changes of phytoplankton in L. Balaton (Hungary). Verh. Intemat. Verein. Limnol. 25: 682-686. Vörös, L. (1995) Kékalgák elszaporodását befolyásoló tényezők és toxicitásuk kutatása. Kutatási jelentés a KTM részére, Tihany, 1-204. Webb, IV. L, M. Newton, D. Starr (1974) Carbon dioxidé exchange of Alrtus rubra. A mathematical model. Oecologia 17: 281-291. Zevenboom, W., L. R. Mur (1980) N2-fixing cyanobacteria: Why they do not become dominant in Dutch eutrophic lakes. - In: J. Barica, L. R. Mur (Eds) Hypertrophic ecosystem, Junk, Hague Zhuang, S., H. Schubert, U. Schiewer (1993) Influence of irradiance and temperature on the cyanobacterium Aphanothece stagnina SPRENGEL isolated Írom the Darss-Zingst Estuary (Southern Baltic) under continuous turbidostat culture. Algological Studies 70: 51-63. Comparative study of the most important planktonic N-fiiing cyanobacteria from Laké Balaton Attila Kovács, Mátyás Présing, Lajos Vörös Balaton Limnological Research Institute of the Hungárián Academy of Sciences, Tihany P.O.B. 35., H-8237 Abstract: The progressive eutrophication of Laké Balaton was perceived in the early seventies associated with increasing dominance of cyanobacteria. From 1975 and onwards, the summer mass development of filamentous N-fixing blue-greens became a regular phenomenon m the western part - and sometimes in the eastem part - of the lake. During the sixties and early seventies the Aphanizomenon flos-aquae was the most abundant N-fixing cianobacterium in the lake, Iater the tropical Cylindrospermopsis raciborskii became dominant and caused nuisance blooms. During the latest bloom (1994) this species produced 95 % of totál phytoplankton biomass. Since 1995 the summers were cooler and wetter and the A. flos-aquae became dominant N-fixing cyanobacterium again. These two species were isolated from the lake and their cultures were used for experimentál studies. We studied the light and temperature-dependence of growth and pigment composition of C. raciborskii and A. flos-aquae The temperature dependence of growth parameters, pigment composition and cell morphology were determined in an incubation system at seven difTerent hght intensities, between 10 and 390 (lEinstein m'

2 sec'

1. Lighting was unidirectional, triplicates were placed in a box with five black walls, one side being open toward the light. Our results indicate that C. raciborskii is a termophilic species. The linear relationship was observed between temperature and growth rate between 15 and 36 °C. The growth rate of A. flos aquae raised to 24 °C then slowly decreased at 27 and 30 °C and the eells were killed at 33 °C. The A parameters of the growth-irradiance curves of C. raciborskii increased linearly with increasing temperature and it's values varied between 7 and 68 (iKinstein m

2 sec"'. The !

t parameter of A. flos-aquae increased to 18-20 °C and in the higher temperature rangé the/j parameter became independent from temperature. Carotenoid / chlorophyll-ű ratio of both species increased with increasing light intensity. Keywords Cylindrospermopsis raciborskii, Aphanizomenon flos-aquae, growth rate, light intensity, temperature