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Studies on net phytoplankton were conducted in the urban Lake Jeziorak Mały (Mazurian Lakeland) in the 1998-2003 period. Changes in the numbers of blue-green algae were analyzed in the annual cycle with respect to water temperature and orthophosphate concentration. An increase in water temperature above 13oC was followed by an increase in the population density of bluegreens. Two abundance peaks of...
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