The biomass of Rotatoria in Lake Balaton

P.-Zánkai, Nóra and Ponyi, Jenő (1973) The biomass of Rotatoria in Lake Balaton. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 40. pp. 285-292. ISSN 0365-3005

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Abstract

Among the most frequent rotifers of the lake three species (Polyarthra vulgaris, Keratella quadrata and Pompholyx sulcata) represent the highest biomass values. On the basis of average biomasses of years 1965, 1966 and 1967, Polyarthra vulgaris is of the highest importance showing a value of 8.3 and 14.1 mg/m³ in the Keszthely Bay and its surrounding as well as in the other parts of the lake. Keratella quadrata and Pompholyx sulcata display different distribution of biomass in the two areas: the former occurred in 7.9 mg/m³ in the samples taken from the Keszthely Bay and its surrounding (segments “M + K”), the latter in 0.4 mg/m³. In the segments representing about two thirds of the lake (segments “G + A + E ”), the former showed 3.5 while the latter 10.3 mg/m³ biomass value. In the larger part of the open water (segments “G + A + E”), the total biomass of the Rotatoria gradually increased till the 1950s from 6.5 up to 40.9 mg/m³, then it remained at nearly identical level until 1967 (38.7 mg/m³).

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