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JOURNAL OF PLANKTON RESEARCH | VOLUME 17 | NUMBER 12 | PAGES 2307-2318 | 1995
© Oxford University Press

research-article

Variation in life history responses of Daphnia to toxic Microcystis aeruginosa

Jaana Hietala1, Marko Reinikainen2 and Mari Walls1,3

1Laboratory of Ecological Zoology, Department of Biology, University of Turku FIN-20500 Turku 2Department of Biology, Åbo Akademi University, BioCity FIN-20520 Turku 3Maj and Tor Nessling Foundation Pohjoinen Hesperiankatu 3 A 4, FIN-00260 Helsinki, Finland

Received on May 28, 1995; accepted on September 13, 1995 Three clones of Daphnia pulex and two clones of Daphnia longispina were exposed to toxic Microcystis aeruginosa for 21 days in a lifetable experiment. The growth and reproduction of individual daphnids were followed daily to study the long-term effects of toxic Microcystis. Exposure to Microcystis increased mortality, decreased growth, delayed maturation and decreased offspring production, indicating nutritional deficiency and toxic effects. We found variation in life history responses between species and among clones. Our results suggest that toxic cyanobacteria may act as a modifying agent in zooplankton communities at both the species and clonal level.


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