Hidrológiai Közlöny 1987 (67. évfolyam)
1. szám - Tátrai István–Istvánovits Vera: A dévérkeszeg (Abramis brama L.) szerepe a Balaton N és P forgalmában
46 HIDROLÓGIAI KÖZLÖNY 1987. 67. ÉVFOLYAM, 1. SZAM Irodalom Andersson G., Breggren H., Cronberg G., Qelin C (1978): Effects of planktivorous and bentliovous fish on organisms and water chemistry in eutrophic lakes. Hydrobiologia, 69, 9—15. Ahlgren, I., Ahlgren, G. (1975): Methods for waterchemical analyses. Institute of Limnology, Uppsala. Renndorf, J., Knesche, II ., Kossatz, K., Penz, E. (1984): Biomanipulation of the pelagic food web by stocking with predacious fishhes. Int. Rev. ges. Hydrobiol., 69, 407—428. Biró, P., Garádi, P. (1974): Investigations on the growth and population structure of bream, Abramis brama L., at different areas of the lake. The assosment of mortality and production. Annnl. Biol. Tihany, 41, 153—179. Brabrnnd, A., Faafeng, B. A., Nilssen, J. P. (1985): Fish and nutrient dynamics in a deep, mesotrophic lake. Verh. Internat, Verein. Limnol., 22. Faafeng, B. A., Nilssen, J. P. (1981): A twenty-year study of eutrophycation in a deep, sortwater lake. Verh. Internat. Verein. Limnol., 21, 412—424. Freswater Biological Assotiation (1978): Water analyses (Eds) F. J. A. Mackereth, J. Heron and J. F. Tallnig. Sei. publ. No. 36. Henrikson, L., Nymán, II. G., Oscarson, II. G., Stenson, J. A. E. (1980): Trophic changes without changes in the external nutrient loading. Hydrobiologia, 68, 256—263. Keen, IV. H., Gagliardi, J. (1981): Effect of brown bullheads on release of phosphorus in sediment and water systems. Progressive Fish Cult., 43, 183—185. Kitchell, J. F., Koonze, J. F., Tennis, P. S. (1975): Phosphorus flux through fishes. Verh. Internat. Verein. Limnol., 19, 2478—1484. Lamarra, V. A. (1975): Digestive activities of carp as a major contributor to the nutrient loading of lakes. Verh. Internat. Verein. Limnol., 19, 2461—2468. Lundgren, A. (1985): Model ecosystems as a tool in freshwater and marine research. Arch. Hydrobiol., Suppl., 70, 2, 157—196. Nakashima, B. S., Leggett, IV. C. (1980): The role of fishes in the regulation of phosphorus availability in lakes. Can. J. Fish. Aquat. Sei., 37, 1540—1549. Paulson, L. J. (1980): Models of ammonia excretion for brook trout, Saívelinus fontinális, and rainbow trout, Salmo gairdneri. Can. J. Fsih. Aquat. Sei., 37, 1421—1425. Shapiro, J., Forsberg, B., Lamarra, V., Lindmark, G., Lynch, M., Smeltzer, E., Zoto, G. (1982): Experiments and experiences in biomanipulation: Studies of ways to reduce algal abundance and eliminate bluegreens. U. S. Environmental Protection Agency EPA —600/3-82-096. Shapiro, J., Wright, D. J. (1984): Lake restoration by biomanipulation: Raung lake, Minnesota, the first two years. Freshwater Biol., 14, 371—383. Tátrai, I. (1984): Contribution of bream, Abramis brama L., and chironomids to the nitrogen budget of Lake Balaton. Kandidátusi értekezés, Tihany— Lodz, 1—109. Tátrai, I., G. Tóth, L., Ponyi, J. E. (1984): The role of fishes in the process of eutrophication. Enclosure experiment in Lake Balaton. BFB Bericht, 51, 1 11—112. Kézirat beérkezett: 198!>. június 4. Átdolgozás beérkezett: 1986. szeptember 6. Közlésre elfogadva: 1986. december 1. The role of breams (Ahramis brama L.) in the TÍ and P cycling of Lake Balaton I. Tátrai, V. Istvánovits Abstract: Enclosure experiment was carried out in order to elucidate the importance of nutrient supply from fish to pliytoplankton in critical summer period in eutrophic Lake Balaton. The water inside of enclosures seemed to be well mixed. The pH was the lowest in the fish enclosure despite the intense photosynthesis, presumable due to enhaced decomposition processes. Two peaks were recorded in primary production reaching maximum values in the enclosure with fish. In the enclosure with fish inorganic nitrogen content of water increased gradually till the end of experiment and ammonia constituted the greatest part of inorganic nitrogen. Total dissolved phosphorus changed with accordance of primary production and it increased due to pliosphorus excretion by fish. The presence and earlier studies may indicate the possibility of biomanipulation in Lake Balaton as an effective tool of water quality control. A decrease in biomass of breams probably would lead to the improved water quality. Keywords: breams, N and P cycling, Balaton 1974-ben szerzett diplomát a Szovjetunióban. Ugyanezen évtől kezdődően a MTA Balatoni Limnológiai Kutató Intézetében dolgozik. 1977-ben doktorált az ELTE-n, majd 1980—1984 között lengyel levelező aspiráns volt a lodzi egyetemen (Disszertációja címe: Contribution of bream, Abramis brama L., and chironomids to the nitrogen budget of Lake Balaton.) Jelenleg, mint az intézet tud. főmunkatársa, a halak vízminőségre gyakorolt hatásmechanizmusával foglalkozik. Tudományos dolgozata száma: 35. TÁTRÁT ISTVÁN
