Investigations on planktonic Crustacea in Lake Balaton V. Horizontally occurring quantitative changes in the different areas of the lake in 1965-1966

Ponyi, Jenő and P.-Zánkai, Nóra (1972) Investigations on planktonic Crustacea in Lake Balaton V. Horizontally occurring quantitative changes in the different areas of the lake in 1965-1966. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 39. pp. 131-139. ISSN 0365-3005

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Abstract

1. There are quantitative differences in the distribution of the total plantonic Crustacea in the open water of Lake Balaton. Greatest numbers were obtained in the area containing highest amounts of organic materials (the Bay of Keszthely and its vicinity where numbers were estimated at 16-20 i/liter in average. 2. The number of Cladocera in areas containing higher amounts of particulate foods (transversal sections M + K) was twice those (6 i/liter) of other areas. Increase in their population occurred once in 1965, and in 1966 — excepting the two middle transversal sections (G + A) of the lake — on two occasions. 3. Average distribution in the number of Copepoda was the same in the different areas of the lake in the identical periods of the two years (10 i/liter in general). Maximum numbers were observed in spring (May). Spring maxima in the Bay of Keszthely and its vicinity (M + K) were several times those of the other transversal sections. 4. There was difference in the population dynamism of Eudiaptomus gracilis (G. 0. S a r s ) between the Bay of Keszthely, its vicinity (M + K) and other areas (G +A + E) of the lake.

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