Abstract
Diel vertical migrations of zooplankton were studied in a small, dystrophic Kruczy Staw Lake. Two rotifer species (Synchaeta pectinata Ehrenberg, Trichocerca simonei DeSmet) inhabiting the lake occurred near lake bottom (7–8 m depth) in the daytime. At night they were observed in surface waters (0–2 m). Both amplitude and speed of the rotifer migration were markedly higher than those of crustaceans. As invertebrate predators are scarce or altogether lacking in the lake, vertical stratification of rotifer and crustacean communities both seasonally and dielly may be caused by strong competition for very low food resources in the lake. This assumption is supported by the observed reverse changes in densities of zooplankton and their food (i.e. picoplankton) during a diel cycle.
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Karabin, A., Ejsmont-Karabin, J. An Evidence for Vertical Migrations of Small Rotifers – a Case of Rotifer Community in a Dystrophic Lake. Hydrobiologia 546, 381–386 (2005). https://doi.org/10.1007/s10750-005-4280-5
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DOI: https://doi.org/10.1007/s10750-005-4280-5