Eutrophication of Lake Swiete (Gniezno, Western Poland) as evidenced by succession of algal assemblages in sedimentary record
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The subject of the study was to the compare results of phytoplankton and the sediment core analyses from several lakes in Wielkopolska (Western Poland). Species composition of algal assemblages occurring in these lakes changed as would be expected for increasing trophic conditions. Along with progressive eutrophication diatom taxa belonging to genera Stephanodiscus and Cyclotella became replaced by green algae and finally by blue-green algae. The dominance of blue-green algae is attributed to hypertrophic conditions.
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D. Machowiak, Department of Hydrobiology, Institute of Environmental Biology A. Mickiewicz University Marcelinska 4, 60-801 Poznan, Poland