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Related Experiment Videos

Coevolutionary chase on exploiter-victim systems with polygenic characters

S Gavrilets1

  • 1Department of Ecology, University of Tennessee, Knoxville 37996-1300, USA.

Journal of Theoretical Biology
|June 21, 1997
PubMed
Summary

This study demonstrates that cyclic coevolutionary dynamics, or "Red Queen" dynamics, are possible in quantitative genetic models between antagonistic species. These dynamics occur when the victim species has stronger selection and greater genetic variance than the exploiter species.

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Area of Science:

  • Evolutionary Biology
  • Quantitative Genetics
  • Ecology

Background:

  • Antagonistic species interactions are common in nature.
  • Coevolutionary dynamics, such as arms races, are often studied in these systems.
  • The applicability of classic coevolutionary models to continuously varying traits is debated.

Purpose of the Study:

  • To investigate the conditions under which cyclic coevolution occurs in a quantitative genetic model of victim-exploiter species.
  • To challenge recent arguments questioning the role of continuous variation and major/minor loci in coevolutionary dynamics.
  • To explore the potential for coevolution to drive stabilizing or destabilizing evolutionary trajectories.

Main Methods:

  • Developed a simple quantitative genetic model for two antagonistic species (victim-exploiter).

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  • Incorporated additive polygenic characters influencing stabilizing selection and interaction strength.
  • Analyzed model dynamics under varying selection pressures, genetic variances, and trait matching optima.

    • Main Results:

    • Cyclic coevolutionary dynamics (a
    • Red Queen
    • arms race
    • evolutionary chase
    • cyclic dynamics
    • quantitative genetics
    • antagonistic species
    • victim-exploiter
    • stabilizing selection
    • genetic variance
    • continuously varying traits
    • coevolution
    • evolutionary arms race
    • Red Queen hypothesis
    • phenotypic matching
    • evolutionary dynamics
    • population genetics
    • speciation
    • natural selection
    • adaptive evolution

    Conclusions:

    • Cyclic coevolution is possible under a wide range of conditions in quantitative genetic models.
    • Victim species with stronger selection, larger genetic variance, and stronger stabilizing selection than exploiters are more likely to drive cyclic dynamics.
    • The findings challenge recent studies that question the role of continuously varying traits and suggest coevolution can be destabilizing, not just stabilizing.