Weekly changes of the bacterio- and phytoplankton standing stock in Lake Balaton and in the highly eutrophic Lake Belső

Oláh, János (1971) Weekly changes of the bacterio- and phytoplankton standing stock in Lake Balaton and in the highly eutrophic Lake Belső. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 38. pp. 167-175. ISSN 0365-3005

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Abstract

1. In Lake Balaton the maxima of the phytoplankton were about 8·10³ cells/ml and those in the Lake Belső 3·10⁵ cells/ml. In both lakes there was a significant spring and winter maximum and in Lake Belső a maximum of blue-green algae in August. In Lake Balaton the standing stock of the winter µ-algae consisted of one species (1-4 µ coccus) while in Lake Belső of several species. There was a significant number of photosynthetic bacteria in Lake Belső. 2. In Lake Balaton the maxima of the heterotrophs were reached in spring and autumn and the minima in summer and winter. In Lake Belső the spring maximum and the summer minimum were the most prominent. In Lake Belső the quantity of the total microbial plankton was above 3·10⁶ cells/ml and the maxima reached 17.7·10⁶ cells/ml, while in the Lake Balaton generally below 1·10⁵ cells/ml and autumn and spring maxima about 1.5·10⁵ cells/ml. Contrary to Lake Balaton, in Lake Belső the quantity of the total microbial plankton was high in summer months, too. 3. The correlation coefficients revealed significant connection (r = -0.913; P<< 0.001) in the surface water of Lake Belső only between the total microbial plankton and the phytoplankton.

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