LONG-TERM CHANGES IN THE ROTIFER FAUNA AFTER BIOMANIPULATION IN HAUSSEE (FELDBERG, GERMANY, MECKLENBURG-VORPOMMERN) AND ITS RELATIONSHIP TOTHE CRUSTACEAN AND PHYTOPLANKTON COMMUNITIES

In Feldberg Haussee, an anthropogenic eutrophicated lake, biomanipulat ion was executed for restoration. To increase the biomass of crustacea ns, fish grazing on zooplankton was reduced by catching small fishes a nd introducing pike-perch. After biomanipulation rotifer biomass from a wide range of species decreased to a small spring maximum with three dominant species. The development of food in spring and food competit ion between crustaceans probably controlled the rotifer development.