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Behavioral drive versus behavioral inertia in evolution: a null model approach.

Raymond B Huey1, Paul E Hertz, B Sinervo

  • 1Department of Biology, Box 351800, University of Washington, Seattle, Washington 98195, USA. hueyrb@u.washington.edu

The American Naturalist
|April 18, 2003
PubMed
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Behavioral thermoregulation in ectotherms, like lizards, can inhibit evolutionary shifts in thermal physiology. This "Bogert effect" challenges the idea that behavior always drives evolution, suggesting it can also constrain it.

Area of Science:

  • Evolutionary Biology
  • Ecology
  • Physiology

Background:

  • The classical view posits that behavioral changes drive evolutionary adaptations.
  • However, behavior can also inhibit or constrain evolutionary trajectories.

Purpose of the Study:

  • To develop a null model quantifying the impact of thermoregulatory behaviors on ectotherm body temperature and performance.
  • To test the hypothesis that behavioral thermoregulation constrains evolutionary shifts in thermal physiology.

Main Methods:

  • Development of a null model for behavioral thermoregulation.
  • Application of the model to field data from the lizard Anolis cristatellus.
  • Analysis of the relationship between altitude, thermal physiology, and behavior.

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Main Results:

  • Thermoregulatory behaviors in Anolis cristatellus were shown to inhibit selection for evolutionary shifts in thermal physiology with altitude.
  • The developed model quantifies the impact of regulatory behaviors on ectotherm performance.
  • Evidence supports the "Bogert effect," where behavior constrains rather than drives evolution.

Conclusions:

  • Behavioral thermoregulation generally constrains evolution, contrary to the classical view.
  • The "Bogert effect" highlights the diverse and sometimes conflicting roles of behavior in evolution.
  • This study challenges the notion of behavior as an inevitable evolutionary driver.