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Evolution in ecological field experiments: implications for effect size.

Sharon Y Strauss1, Jennifer A Lau, Thomas W Schoener

  • 1Section of Evolution and Ecology, University of California, Davis, CA 95616, USA. systrauss@ucdavis.edu

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|November 23, 2007
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Summary

Ecological field experiments may be affected by rapid evolution, where populations adapt to treatments. This adaptation can change the magnitude of treatment effects over time, impacting ecological predictions.

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Environmental Science

Background:

  • Rapid evolution is well-documented, often driven by human activities.
  • Ecological field experiments apply strong selection pressures over multiple generations.

Purpose of the Study:

  • To explore how adaptation influences treatment effect sizes in ecological experiments.
  • To investigate the implications of adaptation for predicting future ecological dynamics.

Main Methods:

  • This perspective synthesizes existing evidence and theoretical arguments.
  • It examines how evolutionary history, treatment type, and adaptive traits mediate changes in effect size.

Main Results:

  • Adaptation to experimental treatments can alter the magnitude of ecological effects over time.
  • While direct evidence is limited, circumstantial examples suggest this phenomenon occurs.
  • Changes in effect size depend on population history and experimental design.

Conclusions:

  • Evolutionary adaptation can complicate the interpretation of ecological field experiments.
  • Distinguishing between plastic and genetic responses is crucial for understanding effect size changes.
  • Future research should focus on linking adaptation dynamics to ecological effect sizes.