Abstract
Experiments were conducted on growing mixed cultures of green Ankistrodesmus arcuatus Korsch and diatom Diatoma elongatum (Lyngb.) algae with and without ciliates Cyclidium glaucoma Ehrenberg and Paramecium caudatum Ehrenberg in accumulative and perfusion cultures. Both alga species successfully developed in the presence of ciliates despite their grazing on both alga species; however, in their absence, Ankistrodesmus arcuatus were suppressed and did not develop. It is supposed that ciliates contribute to the stabilization of the community not only as predators but also by excreting dissolved reduced nitrogen into the environment as a result of their vital functions.
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