Summary: | Pages 21-30 : illustrations 24 cm Bibliographical references (pages 29-30) Abstract in Polish The species diversity and numbers of nematodes in particular zones of three lakes with different trophy were analysed. In an oligotrophic lake (Char) the highest number of profundal nematodes and high species diversity in both profundal and littoral zones were found, in the contrary to data for b-mesotrophic (Żarnowieckie) and eutrophic ( Mikołajskie) lakes. Strony 21-30 : ilustracje 24 cm Bibliografia na stronach 29-30 Streszczenie w języku polskim The species diversity and numbers of nematodes in particular zones of three lakes with different trophy were analysed. In an oligotrophic lake (Char) the highest number of profundal nematodes and high species diversity in both profundal and littoral zones were found, in the contrary to data for b-mesotrophic (Żarnowieckie) and eutrophic ( Mikołajskie) lakes.
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