Nematodes of Lake Balaton. III. The fauna in late-summer

Bíró, Kálmán (1972) Nematodes of Lake Balaton. III. The fauna in late-summer. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 39. pp. 89-100. ISSN 0365-3005

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Abstract

The material in our collection provides a picture on the qualitative and quantitative composition of nematodes in the bottom sediment of the open water of Lake Balaton in late-summer 1968. Two new species were found for the Hungarian fauna: Microlaimus globiceps De Man and Paraphanolaimus anisitsi (Dad.) Andrássy. Achromadora terricola De Man, Dorylaimus helveticus Steiner, Tobrilus helveticus Ноfm. found in the collections are new species for Lake Balaton. The most frequent five nematodes were: Paraplectonema pedunculatum S., Paraphanolaimus behningi M., Monhystera paludicola Dm., Theristus setosus B., Ironus tenuicaudatus Dm., their distribution, however, in the bottom sediment of the open water was not uniform. The number of nematodes was greater in the north-east-basin of Lake Balaton (15 000 i/m²) than in the south-west (10 000 i/m²). Greater numbers — above 23 000 i/m² — were generally found near the northern shore. Along the longitudinal axis of the lake a minimum was observable: 5000 i/m².Lowest numbers were recorded for the area of the Bay of Szigliget: 3000 i/m³. Comparison of the quantitative distribution of nematodes with that of algae living on the surface of bottom shows that in areas where the diatoms were numerous (150 000—200 000 i/dm²) only few nematodes (below 5000 i/m²) were found in general. Biomass figures of nematodes varied between 5 to 10 mg/m². They were the lowest, only 1 2 mg/m², in the Bay of Szigliget. Highest values beyond 12 mg/m² were measured in the Bay of Keszthely and in the central part of the north-east basin. In the “kút” at Tihany and the Bay of Fűzfő — different from their surroundings — both the individual number and biomass values of nematodes were great. These observations call the attention to the importance of a more thorough investigation of these areas.

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