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Alternative antipredator defences and genetic polymorphism in a pelagic predator-prey system

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons56642

De Meester,  Luc
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons56990

Weider,  Lawrence J.
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons56972

Tollrian,  Ralph
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Zitation

De Meester, L., Weider, L. J., & Tollrian, R. (1995). Alternative antipredator defences and genetic polymorphism in a pelagic predator-prey system. Nature, 378(6556), 483-485.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-E2F2-F
Zusammenfassung
DIEL vertical migration (DVM) of zooplankton is generally considered to be a predator-avoidance strategy: zooplankton migrate to greater depths during the day to reduce their chance of being detected by visual predators (fish)(1). Both phenotypic plasticity and interpopulational genetic variability in DVM patterns exist in zooplankton(2,3). We used large indoor mesocosms ('plankton towers'(4)) to study intrapopulational genetic variation for day depth in a Daphnia hyalina x galeata hybrid population. Clones differing in body size also differed in vertical distribution, with the largest clone residing at the greatest depth during the day. A selection experiment in the presence of fish indicates that alternative antipredator strategies, which involve a complex association between habitat-selection traits and life-history strategies, might be an important factor underlying intrapopulational genetic polymorphism in zooplankton, through a balancing of fitness effects in the presence of visual predators