13 habitats (17 sampling places) in the Slovak Tatra National Park were investigated with regard to the Paramecium aurelia species complex and other zooplankton. No species of the aurelia complex were found, only paramecium bursaria and P. caudatum were recorded at some sampling places. In the studied water bodies acidification of water was noted. This caused impoverishment of their zooplankton composition including ciliates.
E.Przybos, Department of Experimental Zoology, Institute of Systematics and Evolution of Animals, Polish Academy of Sciences, Slawkowska 17, 31-016 Krakow, Poland