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Enclosures (17 m3) were used in the mesotrophic area of Lake Balaton to determine the impact of benthivorous bream (Abramis brama L.) on the lower trophic levels during summers of 1984–86. In enclosures with a fish biomass similar to the biomass in the
eutrophic area of the lake, the number of phytoplankton species was highest. In enclosures with a low fish biomass the phytoplankton
was dominated by the greens. A high biomass of bream in the mesotrophic basin caused bacterial production corresponding to
that of the eutrophic part of the lake. Crustaceans were dominated by copepods and were unable to control phytoplankton peaks.
Bottom-up effects of bream were more obvious than top-down effects and seem to be more important in the possible control of
water quality. 相似文献
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