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Nonconsumptive predator-driven mortality causes natural selection on prey.

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Predatory dragonflies impose natural selection on damselflies, favoring higher activity levels. This selection occurs through nonconsumptive mortality, not just predation, highlighting diverse predator impacts on prey evolution.

Keywords:
Adaptationconsumptive mortalitynatural selectionnonconsumptive mortalitypredationprey defenses

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Behavioral Ecology

Background:

  • Predators drive natural selection primarily through consumption.
  • Nonconsumptive effects (NCEs) of predators can also cause mortality.
  • The potential for NCEs to drive prey evolution is less understood.

Purpose of the Study:

  • To experimentally test if nonconsumptive mortality from predators can cause natural selection on prey.
  • To investigate if different prey phenotypes vary in susceptibility to nonconsumptive mortality.

Main Methods:

  • Experimental setup involving predatory dragonflies and damselfly prey.
  • Quantification of prey mortality and activity levels under predation risk.
  • Analysis of selection gradients on prey traits.

Main Results:

  • Nonconsumptive mortality imposed by dragonflies selected for increased activity levels in damselflies.
  • Prey activity influenced susceptibility to nonconsumptive mortality.
  • Evidence for selection beyond direct consumption.

Conclusions:

  • Predators exert evolutionary selection on prey through both consumptive and nonconsumptive pathways.
  • Prey defensive traits may be adaptations to multiple sources of predator-induced mortality.
  • Understanding NCEs is crucial for a comprehensive view of predator-prey evolutionary dynamics.