EUTROPHICATION OF SILVER-LAKE - PLANKTON AND BOTTOM FAUNA CHARACTERISTICS

As a part of investigations on the present state of the quality of Sil ver Lake, causes of its degradation, and protection measures, chemical and biological investigations were carried out in October of 1994. It was found that structure of phytoplankton and its extremely high abun dance clearly indicate eutrophic water. Abundance of zooplankton was r elatively high, but biomass was low in all samples, since individuals of small dimensions prevailed. Live organisms of macrozoobenthos were virtually absent, inasmuch as since degradation of bottom sediment qua lity and anaerobic conditions make for a habitat no longer suitable fo r macrozoobenthos.