JOURNAL OF PLANKTON RESEARCH | VOLUME 13 | NUMBER 1 | PAGES 83-89 | 1991
© Oxford University Press
research-article |
A mechanism of predator-mediated induction of diel vertical migration in Daphnia hyalina
Department of Aquatic Ecology, University of Amsterdam Kruislaan 320, 1098 SM Amsterdam, The Netherlands
Received on November 27, 1989; accepted on August 21, 1990 Predator avoidance is generally thought to be the most important ultimate reason for diel vertical migration in zooplankton. Combining field observations and experimental results, it is shown, first, that a phototactic reaction to relative changes in light intensity is at the base of a diel vertical migration and, secondly, how this phototaxis is enhanced by a chemical mediated by juvenile perch.
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