Hidrológiai Közlöny 1998 (78. évfolyam)

4. szám - Fülöp István Antal–Józsa János: A neruális hálózatok világa

295 kik a Leptolyngbya sp. reakció centrum méretének növekvő fényintenzitás miatti csökkenését észlelték. Köszönetnyilvánítás A munka a Környezetvédelmi és Területfejlesztési Minisztérium, a Miniszterelnöki Hivatal, valamint a T 016303 OTKA anyagi támogatásával készült. Irodalom Albertano, P.. (1996) Light and temperature responses of terestial sciaphilous strains of Leptolyngbya sp. in cross-gradient cultures. Algological Studies 83: 17-28. Albertano. P. & L. Bruno, (1995) Photosynthesis, pigments, and ultrastructure of sciaphilous terrestial cyanopytes. Giorn. Bot. Ital. 129. In press. Bowler, C„ Marc Van Montagu, D. Inzé, (1992) Superoxide dismutase and stress tolerance Annu. Rev. Plánt Physiol. Plánt Mol. Biol. 43: 83-116. Gorzó, Gy., (1985): A Balaton üledékéből kitenyészthető planktonikus, heterocisztás cianobaktériumok. Hidrológiai Közlöny 6: 357-359. Graham, J. M.. (1995) Physiological responses to temperature and irradiance in Spirogyra (Zygnematales, Charophyceae). J. Phycology 31: 531-540. Herodek, S„ (1986) Phytoplankton changes during eutrophication and P and N metabolism. In: Solyódi L. and van Straten G. (eds): Modelling and Managing Shallow I,ake Eutrophication. Springer-Verlag, Berlin. 183-204. Hiripi, L„ Kovács, A., Vörös, L„ (1997) HPLC-s pigmentanalízis alkalmazása a fitoplankton diverzitásának vizsgálatában. E kötetben Ibelings, A. W., (1996) Changes in photosynthesis in response to combined irradiance and temperature stress in cyanobacterial surface waterblooms. J. Phycology 32: 549-557. Iwamura, T., H. Nagai, S. Ichimura, (1970) Improved methods for determining contents of chlorophyll, protein, ribonucleic acid, deoxiribonucleid acid in planktonic populations. Int. Revue ges. Hydrobiol. 55: 131-147. 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., Koncz, E„ Vörös, L„ (1997) Nyári cianobaktérium populációk dominancia viszonyainak alakulása a fényintenzitás függvényében. Hidrológiai Közlöny 77: 14-16. Mantoura. R.. F. C. & C. A. Llewellyn, (1983) The rapid determination of algal chlorophyll and carotenoid pigments and their breakdown products in natural waters by reverse-phase high-performance liquid chromatography. Analitica Chimia Acta 151: 297-314. Padisák, J„ L. G. Tóth, L. Vörös, (1984) Anabaenopsis raciborskii Wolosz. bloom in laké Balaton in the summer and autumn of 1982. BFBBericht, 51:77-81. Présing, M„ S. Herodek, L. Vörös, I. Kóbor. (1996) Nitrogén fixation, ammónium and nitráté uptake during a bloom of Cylindrospermopsis raciborskii in Laké Balaton. Arch. Hydrobiol. 4: 553-562. Schubert, H„ B. M. A. Kroon, H. C. P. Matthhijs, (1994) In Vivo mampulation of the xanthophyll cycle and the role of zeaxanthin in the protection against photodamage in the green alga Chlorella pyrenoidosa. The Journal ofBiological Chemistry 269: 7267-7272. Shafik, H. M„ Vörös, L„ Présing, M„ Kovács, A., 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. Utermöhl, H. (1958) Zur Vervollkommung der quantitativen Phytoplankton-Methodik. Mitt. Int. Ver. Limnol. 9: 1-38. 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-medencélyében 1979-ben Hidrológiai Közi. 9. Vörös, L. &J. Padisák, (1991) Phytoplankton biomass and chlorophyll-o in somé shallow lakes in central Europe. Hydrobiol. 215, 111-119. Vörös, L. & P. Nagy Göde, (1993) Long term changes of phytoplankton in Laké Balaton (Hungary). Verh. Intern. Verein. Limn. 25: 682-686 Vörös, L. (1995) Kékalgák elszaporodását befolyásoló tényezők és toxicitásuk kutatása. KTM kutatási jelentés 204 oldal Webb. W. L., M. Newton, D. Starr, (1974) Carbon dioxidé exchange of Alnus rubra.. A mathematical model. Oecologia 17: 281-291. Wünschmann, G. & J.J. Brand, (1992) Rapid turnover of a component required for photosynthesis explains temperature dependence and kinetics of photoinhibition in a cyanobacterium, Synechococcus 6301. Planta (Berl.) 186: 426-433. Zevenboom, IV. & L. R.. Mur, (1980) N

2-fixing cyanobacteria: Why they do not become dominant in Dutch eutrophic lakes. In: J. Barica, L. R. Mur (Eds) Hypertropic ecosystem, Junk, Hague Zhuang, S„ H. Schubert, U. Schiewer, (1993) Influence of irradiance and temperature on the cyanobacterium Aphanothece stagnina SPRENGEL isolated from the Darss-Zingst Estuary (Southern Baltic) under continuous turbidostat culture. Algological studies 70, 51-63. Light- and tcmperature-dependencc of growth and pigment composition of Cylindrospermopsis raciborskii (Wolosz.) Seenaya et Subba Raju Attila Kovács, László Hiripi, Mátyás Présing & Lajos Vörös Balaton Limnological Research Institute of the Hungárián Academy of Sciences, Tihany Abstract: The progressive eutrophication of Laké Balaton was perceived in the early sevcnties. The first indications was the quantity of diatoms and dinoflagellates increased moderately. From 1975 and onwards, the summer mass development of filamentous blue-greens became a regular phenomenon in the western part - and sometimes in the eastern part- of the lake. The eutrophication of Laké Balaton is associated with increasing dominance of blue-greens, with parallel to many temperate and tropical lakes. Cylindrospermopsis raciborskii is one of the most common species of cyanobacteria which can cause nuisance blooms ín tropícal and subtropical waters. During the latest cyanobacterial bloom (1994), water and sediment samples collected in Lake Balaton have been used as basis for establishing enrichment cultures. These cultures were used for extensive isolations to obtain clonal cultures of strains for experimentál studies. The first C. raciborskii strain isolated from Lake Balaton (ACT-9502) was the subject of a series of ecophysiologica! experiments performed in batch and continuous cultures. The temperature dependence of growth parameters, pigment composition and cell morphology were determined in an incubation system at seven different light intensities, between 10 and 390 ^Einstein m"

2 sec"

1. Lighting was unidirectional, triplicates were placed in a box with five black walls, one side being open toward the light. Result indicates that C. raciborskii is a termophilic species. We observed linear relationship between temperature and growth rate in temperature rangé of 15 and 36 °C. The /

k parameters of the growth-irradiance curves varied between 6.6 and 68 ^Einstein m 2 sec '. Carotenoid /chlorophyll-a ratio increased significantly (fivefold-eightfold) with increasing light intensity. Natural populations of C. raciborskii usually show yellow-green color due to their high oscillaxanthin content. Keywords: Cylindrospermopsis raciborskii, light intensity, temperature, cross gradient