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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 8 | PAGES 1637-1644 | 1998
© Oxford University Press

other

Chemical interference by Daphnia on Keratella: a life table experiment

José M. Conde-Porcuna

Department of Animal Biology and Ecology, Faculty of Sciences University of Granada E-18071 Granada, Spain

Received on February 3, 1998; accepted on April 2, 1998 Daphnia can suppress rotifers through mechanical interference (interference competition) and exploitative competition. To test chemical interference (interference competition) by Daphnia on the rotifer Keratella, life history characteristics were analysed for Keratella cochlearis in the presence and absence of Daphnia-mediated chemicals. The presence of Daphnia-mediated chemicals induced a lower fecundity and a decrease in the intrinsic rate of population growth. This type of interference competition should affect the composition of natural rotifer communities regardless of mechanical interference and exploitative competition due to Daphnia.


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