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Eutrophication and winter-period structure of phytoplankton in three deep lakes in the Łęczna-Włodawa Lakeland, eastern Poland

Wojciechowska W., Pęczuła W., Zykubek A.

Polish Journal of Ecology

1998

Vol. 46, no 1

89-99

Studies were done in winter 1996 in three ice-covered dimictic lakes of the Łęczna-Włodawa Lakeland, eastern Poland. They involved physico-chemical conditions (temperature, oxygen concentration, pH, conductivity and Secchi-disc transparency), as well as biological ones (abundance, chlorophyll a concentration and phytoplankton structure). The oxygenation of the near-bottom layers combined with the observed structure of the winter phytoplankton confirm the rate of eutrophication of these bodies of water which had already been observed in the summer.