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1 Oceanological and Hydrobiological Studies

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Long-term changes in the phytoplankton of Lake Charzykowskie

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Wiśniewska M. , Luścińska M.

tom Vol. 41, No. 3

90-98

The research on phytoplankton communities in Lake Charzykowskie was carried out at intervals since the 1940s till the beginning of the 21 century. Long-term observations, initially of the species composition and in the following years also of the biomass and the concentration of chlorophyll-a in relation to habitat conditions, allowed to assess the impact of the catchment area on changes in the trophic status of the lake for over 50 years. And thus, based on the results of physicochemical analysis and studies on the phytoplankton structure in the 1940s, the lake was classified as ß-mesotrophic (Cabejszek 1950), between the 1960s and the1990s as eutrophic (Szulkowska-Wojaczek 1968, 1976; Wiśniewska 1994, 2000), in 2004 as hypertrophic (Wiśniewska 2005), and in 2008 and 2009 as meso-eutrophic.