Quantitative relationships of the Rotatoria plankton in Lake Balaton during 1966-1966

P.-Zánkai, Nóra and Ponyi, Jenő (1972) Quantitative relationships of the Rotatoria plankton in Lake Balaton during 1966-1966. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 39. pp. 189-204. ISSN 0365-3005

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Abstract

1. In Lake Balaton the same five species dominated during the periods of examination. The number of accompanying species, however, varied considerably, in 1965 and) 1966 it was seven and 21, respectively. 2. Monthly averages of total numbers per litre of Rotatoria show that the population density was the highest in the central areas of the lake (110, 195 i/litre), while in the Bay of Keszthely and in the other end of the lake numbers smaller by 9-30% and 6-22%, respectively, were registered. 3. In 1965 an increase in the total population took place twice in the whole lake except in the Bay of Keszthely, and the increases along transversal sections “G” - “E” were smaller in summer than in autumn. 4. In 1966 total numbers per litre of rotifers increased twice and three times in the south-west and northeast basins respectively. In the whole lake the increase in population was greater in summer than in autumn. 5. The population dynamism of the dominating species along the individual transversal sections was not the same in the two years examined. The maximum population density of some species (Polyarthra vulgaris, K. c. tecta) was smaller in 1965 than in the following year. 6. Comparison of the results obtained in identical periods of the three years show that whereas the population density in 1966 was the highest, only small quantitative differences existed between the two other years.

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