RELATIONSHIP BETWEEN THE PHYTOPLANKTON AND ZOOPLANKTON ABUNDANCE IN AGRAVEL-PIT LAKE AT SENEC (W SLOVAKIA) IN 1986-1990

The development of zooplankton in the Senec gravel-pit lake and its re lationship on the water quality affected by biomanipulation were inves tigated over a five year vegetational period. Particular attention was given to the dependence of the zooplankton development on the phytopl ankton abundance. The occurrence of Protozoa was found to be controlle d also by the qualitative composition of phytoplankton. In 1989-1990, thirty taxa from the groups of Rotatoria, Anomopoda and Copepoda were identified.