The horizontal distribution of Rotifera plankton in Lake Balaton

P.-Zánkai, Nóra and Ponyi, Jenő (1971) The horizontal distribution of Rotifera plankton in Lake Balaton. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 38. pp. 284-304. ISSN 0365-3005

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Abstract

1. The Rotifera plankton of the open water of the lake was composed by 40 species, varieties and forms during two years (1966-67). Three of them (Encentrum wiszniewszki Wulfert, Trichocerca rousseleti (Voigt ) and Asplanchna girodi de Guerne) are new to the fauna of Hungary whereas Brachionus diversicornis (Daday is new for that of Lake Balaton. 2. Qualitative investigations have proved that 5 species (Keratella cochlearis, K. c. tecta, K. quadrata, Polyarthra vulgaris, Pompholyx sulcata) can be considered as the main elements of the Rotifera plankton of the open water in Lake Balaton. 3. On the basis of their horizontal distribution, the species have been classified into 4 groups: a = those found in the open water of the whole lake, being of nearly uniform in distribution; b = those found only in the northeastern basin and showing a higher percentage there, respectively; c = those found only in the south-western basin and showing a higher percentage there, respectively; d = those living in the Készt hely-Bay. 4. On the basis of percentage distribution of the dominant species as well as of Marczewski-Steinhaus index, three areas can be distinguished in the open water of Lake Balaton: a) North-eastern basin (“E-A” sections), b) Keszthely-Bay and Szigliget-Bay (“M-К” sections), c) “G” section of the south-western basin can sometimes be assumed to belong to the ncrth-eastern part while at other times to the “K” section. 5. The richest region in species was the Keszthely-Bay and its surrounding. Taxa found here are characteristic mainly for the strongly eutrophic waters.

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