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Applied and Environmental Microbiology, February 1999, p. 737-739, Vol. 65, No. 2
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Role of Microcystins in Poisoning and Food Ingestion Inhibition of Daphnia galeata Caused by the Cyanobacterium Microcystis aeruginosa

Thomas Rohrlack,1,* Elke Dittmann,2 Manfred Henning,1 Thomas Börner,2 and Johannes-Günter Kohl1

Research Group Ecology,1 and Research Group Genetics,2 Department of Biology, Humboldt University, D-10099 Berlin, Germany

Received 17 August 1998/Accepted 2 November 1998

The effects of microcystins on Daphnia galeata, a typical filter-feeding grazer in eutrophic lakes, were investigated. To do this, the microcystin-producing wild-type strain Microcystis aeruginosa PCC7806 was compared with a mcy- PCC7806 mutant, which could not synthesize any variant of microcystin due to mutation of a microcystin synthetase gene. The wild-type strain was found to be poisonous to D. galeata, whereas the mcy- mutant did not have any lethal effect on the animals. Both variants of PCC7806 were able to reduce the Daphnia ingestion rate. Our results suggest that microcystins are the most likely cause of the daphnid poisoning observed when wild-type strain PCC7806 is fed to the animals, but these toxins are not responsible for inhibition of the ingestion process.

* Corresponding author. Mailing address: Institut für Biologie, FG Ökologie, Humboldt-Universität zu Berlin, Unter den Linden 6, D-10099 Berlin, Germany. Phone: 493020936525. Fax: 493020936530. E-mail: ThRohrlack{at}compuserve.com.

Applied and Environmental Microbiology, February 1999, p. 737-739, Vol. 65, No. 2
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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