Summer blooms of Aphanizomenon flos‐aquae var. flos‐aquae accompanied by dense populations of Daphnia were common in fish ponds of the district Blatná in 1950s‐1960s. Changes in management (increased stocking densities, decreased usage of superphosphate as fertilizer) made this type of plankton less frequent. The present study documents this trend and suggests explanations.
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Pechar et al. (1991) studied this question.
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