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Seasonal succession of zooplankton of Lake Ladoga (NW Russia)

Lake Ladoga, the 1argest 1ake in Europe, was oligotrophic until the mid-1960s and became mesotrophic in the 1970s due to intensive eutrophication (RUMYANTSEV et al. 1999). Some long-term trends in the state of the zooplankton community during the last few decades, mostly based on observations conducted in August, have been described earlier (ANDRONIKOVA 1996a, ANDRONIKOVA et al. 2000, AVINSKY 2003), but until recently no information was available on the seasonal dynamics of the zooplankton. This study is part of the joint Russian-Finnish Maqrel project, financed by the EU, the main objectives of which are to describe changes in species composition and the amplitude of quantitative characteristics o f zooplankton in Lake Ladoga during the growing season and to assess the state of the zooplankton community.