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Related Experiment Videos

Intraspecific competitive divergence and convergence under assortative mating.

Reinhard Bürger1, Kristan A Schneider

  • 1Department of Mathematics, University of Vienna, Nordbergstrasse 15, 1090 Vienna, Austria. reinhard.buerger@univie.ac.at

The American Naturalist
|May 4, 2006
PubMed
Summary

Ecologically driven sympatric speciation can occur when frequency-dependent selection is strong and mating assortment is sufficiently high. Evolutionary splitting requires strong selection and assortment with low choiciness costs.

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Area of Science:

  • Evolutionary biology
  • Population genetics

Background:

  • Ecologically driven sympatric speciation is a key area of evolutionary research.
  • Understanding the genetic and ecological factors promoting reproductive isolation is crucial.

Purpose of the Study:

  • To investigate conditions favoring sympatric speciation using a multilocus model.
  • To analyze the interplay of frequency-dependent selection, assortment, and choiciness costs.

Main Methods:

  • A multilocus model of a quantitative trait under frequency-dependent selection.
  • Simulating sexual haploid populations with varying selection and assortment strengths.

Main Results:

  • Strong frequency dependence can cause disruptive selection.

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  • Evolutionary splitting requires strong frequency dependence and assortment with low costs.
  • Nonlinear effects of assortment strength on genetic variation were observed.

    • Conclusions:

    • Sympatric speciation is possible under specific ecological and genetic conditions.
    • The strength of assortment and frequency-dependent selection are critical factors.
    • Model outcomes are sensitive to genetic architecture and initial conditions.