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Journal of Plankton Research, Vol 21, 1175-1182, Copyright © 1999 by Oxford University Press

ORIGINAL ARTICLES

Short communication. Direct and indirect effects of strong grazing by Daphnia galeata on bacterial production in an enclosure experiment

N Kamjunke and R Zehrer
Dresden University of Technology, Institute of Hydrobiology, D-01062 Dresden, Germany; Present address: Institute of Freshwater Ecology and Inland Fisheries, Department of Biology and Ecology of Fishes, POB 850119, D-12561 Berlin, Germany

Bacterial production was stimulated in Daphnia enclosures at the beginning of the experiment due to the release of dissolved organic carbon during Daphnia grazing of algae (sloppy feeding). In contrast, bacterial production decreased in the treatments at the end of the experiment. The decline was not caused by reduction of bacterial biomass, but by decreasing biomass-specific production due to a decline of the resources for bacterial growth (phytoplankton biomass and production).
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