Abstract

The zooplankton-phytoplankton interactions inthe Kursių Marios lagoon (southeastern Baltic Sea)were investigated in 1995. The objective was toevaluate the role of herbivores (crustaceanzooplankton) in the seasonal succession ofphytoplankton, as well as the influence of foodconditions on structure and dynamics of zooplanktoncommunity. Our results demonstrated that thecrustacean grazing pressure may restrict thedevelopment of small Chlorophyta and Diatomophyceaeand, in turn, favouring growth of Cyanobacteria.Blooms of filamentous Cyanobacteria possibly has aninhibitory effect for Daphnia, decreasing theirbiomass as well possibly explaining the shift ofdominant zooplankton species. The influence ofplanktivory on seasonal plankton succession remainsunclear because of lack of fish data.

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