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Conference Paper

Daphnia diel vertical migration behavior: Response to vertebrate predator abundance


Loose,  Carsten J.
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Loose, C. J. (1993). Daphnia diel vertical migration behavior: Response to vertebrate predator abundance.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-E407-F
The response of Daphnia diel vertical migration (DVM) to different predator regimes was studied in an 11.2 m high stratified tower tank. A gradual increase in fish abundance chemically-induced a parallel increase in the average depth of the Daphnia population during day, whereas at night the population stayed in the warm epilimnion regardless of fish abundance. The response curve of mean day depth vs. predator abundance shows a saturation effect at high fish densities. The effect of the chemical factor inducing DVM vanished within 72 hrs after removal of the predator from the system. The results suggest that the adaptation of DVM to changes in predator abundance could be based upon the phenotypically-plastic response of a given genotype to varying concentrations of a chemical factor produced by fish.