Zooplankton-based assessment of the trophic state of three coastal lakes - Lebsko, Gardno, and Jamno

摘要

The qualitative and quantitative analysis of the zooplankton of three coastal lakes, Lebsko,Gardno, and Jamno, was based on materials collected in the 1985-1997 period from June to September. Itwas found that the number of zooplankton species, their abundance, and their biomass varied greatly andwere dependent on abiotic factors and lake trophy. An analysis of the structure characteristics of zooplankton as bioindicators of eutrophication in lakes Lebsko, Gardno, and Jamno revealed the presence in thezooplankton community of numerous species of rotifers and crustaceans, which are considered to be goodindicators of lake trophy. The progressing eutrophication of the lakes was accompanied by a constant increase in the numbers and biomass of Rotifera and Crustacea. In all three lakes the zooplankton abundancewas determined by rotifers and biomass by crustaceans. The zooplankton-related trophic state indicespermitted classifying the lakes examined as meso-eutrophic or eutrophic, with symptoms of polytrophy.