Abstract
The study results of six floodplain lakes of the Upper Ob basin was presented in the paper. The sites with and without thickets of higher aquatic vegetation were investigated. The aim of the work was to assess the ecological state of these reservoirs based on hydrochemical and hydrobiological (phytoplankton and zoobenthos) indicators. In most lakes, the increased chlorophyll A and biogenic elements content indicated the ongoing eutrophication. The growing number and biomass of bottom communities were recorded in the overgrown areas of four out of six reservoirs. Depleted benthic communities were revealed in the deepest sections of the studied lakes.
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