Horizontal plankton investigations in Lake Balaton VI. A study of the open water Rotatoria of the Balaton, based on collectings in 1965

P.-Zánkai, Nóra and Kertész, György (1967) Horizontal plankton investigations in Lake Balaton VI. A study of the open water Rotatoria of the Balaton, based on collectings in 1965. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 34. pp. 255-275. ISSN 0365-3005

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Abstract

The authors executed the qualitative investigation, by relative quantitative methods, of the 38 netted Rotatoria samples, collected at one site each of five sections perpendicular to the longitudinal axis of Lake Balaton in the months June-October, 1965. A total of 38 species, varieties, and forms have been identified, of which one species (Anuraeopsis fissa) proved to be new fo the fauna of the Balaton. It was established that, for the given survey period of the year 1965, the lake can be subdivided into three parts on the basis of the qualitative composition of the Rotatoria plankton (Table 2, Figs 2-6). 1. Sections Ee, A,, and G. The characteristic species were: Pompholyx sulcata, Anuraeopsis fissa, Asplanchna priodonta, Brachionus sessilis, and Testudinella mucronata. The graphs indicating the percentual occurrence of the dominant species showed great similarity in sections Ee and A1; whereas that of section G slightly differs from the preceding ones during the summer months. 2. The characteristic species of section К was Kellicottia longispina, excelling by rather high percentual values during the period of investigation (except for August). Keratellaquadrata shows similar occurrence values, appearing with rather high percentage figures also in the Keszthely-bay. The specific composition stands nearer to that of the Keszthely-bay than those of the three preceding sections. 3. The Rotatoria fauna of the Keszthely-bay differs from those found in all other Sections. The characteristic species were: Synchaeta kitina and oblonga, Brachonius angularis, Keratella cochlearis macracantha, Polyarthra major, and Trichocerca species. Several species, represented by one specimen each, have also been found here, taxa which cannot be regarded as typical constituents of the plankton. Those found here proved in the majority to favour eutrophic waters, plants and detritus. The incidentally or constancy of the above distribution of the Rotatoria plankton will be determined by future investigations.

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