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RUNAWAY EVOLUTION TO SELF-EXTINCTION UNDER ASYMMETRICAL COMPETITION.

Hiroyuki Matsuda1, Peter A Abrams1

  • 1Department of Ecology, University of Minnesota, 1987 Upper Buford Circle, St. Paul, Minnesota, 55108.

Evolution; International Journal of Organic Evolution
|June 1, 2017
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Summary
This summary is machine-generated.

Intraspecific competition, driven by varied resource distribution, can lead to species extinction. This challenges the idea that interspecific competition solely drives evolutionary cycles.

Keywords:
Anoliscompetitionevolutionarily stable strategyfrequency dependencesize-advantagetaxon cycle

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Area of Science:

  • Evolutionary Biology
  • Ecological Modeling

Background:

  • Exploitative competition models often explain taxon cycles.
  • Previous models focused on interspecific competition's role.

Purpose of the Study:

  • Analyze a trait evolution model under competition.
  • Investigate intraspecific competition's role in extinction and trait evolution.

Main Methods:

  • Modified a popular exploitative competition model.
  • Introduced non-normal resource distribution (logarithmic scale).

Main Results:

  • Purely intraspecific competition can drive extreme competitive trait evolution.
  • This evolution can lead to self-extinction without interspecific influence.
  • Self-extinction is contingent on trait advantage magnitude and carrying capacity decline rate.

Conclusions:

  • Within-species competition may drive taxon cycles, not just between-species.
  • Resource distribution and trait-advantage data are crucial for understanding competitive trait evolution (e.g., body size).