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Attempt at a multifactor estimation of the eutrophication of the tihany area of lake balaton hungary 3. discussion a long term successional model of the eutrophication


Attempt at a multifactor estimation of the eutrophication of the tihany area of lake balaton hungary 3. discussion a long term successional model of the eutrophication



Botanikai Kozlemenyek 71(1-2): 7-16



ISSN/ISBN: 0006-8144

The less eutrophic part of the largest shallow lake of Central Europe (Lake Balaton, Hungary) was studied in the summers of 1976, 1977, 1978, 1979, 1980 and 1982. About 20,000 data of the main plankton-groups were analyzed with respect to eutrophication. Variables (29) were tested by 48 trophic scales or features described in the past 35 yr based on data of about 500 lakes located mainly in the temperate zone. The studied variables differed as to the 1st indication of the eutrophic state, their successive increases led to outlining a long-term eutrophication model of this area of the lake as follows: as a 1st effect of the increasing loading with nutrients, the community structure changed (1965-1972). Then the primary production (1973-1975), and the algal numbers (1974-1976) increased serving as a better nutrient supply for the zooplankton. Simultaneously with the increase in algal numbers the zooplankton variables also increased. A 10-fold increase in algal numbers was observed in 1978-1979. Bacterial variables showed an increase after the increase in phytoplankton biomass, but except for the bacterial generation time, remained within oligo-mesotrophic, mesotrophic levels. The presumably important role of the bottom fauna and fishes in the recycling of nutrients in Lake Balaton is discussed.

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