No abstract

A study on zooplankton species composition, seasonal dynamic of numbers and biomass of three large floodplain’s lakes of the Tom River basin (near Tomsk, Western Siberia, Russia) during one year has been carried out. It has determined considerable transforming of qualitative and quantitative indicators of zooplankton communities during a year. The maximum qualitative indicators were registered in late spring and summer, the minimum ones – in winter. By the structure of zooplankton, the examined lakes water ecological status falls into class 1-2 of water quality (“moderately polluted” water). The most favourable conditions for zooplankton communities forming are in Boyarskoye and Shuchie lakes, the most unfavourable – in Kalmatskoe lake.