Short periodic changes in the microbial plankton quantity of Lake Balaton

Oláh, János (1970) Short periodic changes in the microbial plankton quantity of Lake Balaton. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 37. pp. 199-207. ISSN 0365-3005

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Abstract

1. The short periodic changes of the saprophytic and total microbial plancton varied according to seasons: (a) in winter, under the ice the short periodic change was not significant; (b) in spring, with a temperature rise a significant short periodic change was observed even without a decrease in Secchi transparency (c) while in summer, with a decrease in Secchi transparencyin Keszthely-Bay the number of saprophytes increased by several order of magnitude, the, without a Secchi decrease we measured no significant short periodic change; (d) in autumn, the sudden decrease in transparency brought about pronounced short periodic changes. Consequently, we attached importance in the short periodic changes to temperature and to the wind disturbing the sediment. 2. In winter, under the ice we found a stabile stratification and in the bottom layer the quantity of the total mikrobial plankton (2·10⁶/ml) surpassed the values measured in spring, summer and autumn. The high number of bacteria bears a close connection with the winter formation of the µalgal stock exceeding even 19·10⁶/l. All these conditions made possible the development of a significant stock of zooplankton. The mass proliferation of µ-algae in the reedery was lacking and the quantity of the total microbial plankton was likewise smaller, consequently, the number of zooplankton is also low. 3. The seasonal short periodic investigations, beside the first description of high winter values, support the previously observed spring maximum an summer-late summer minimum in the seasonal dynamics.

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