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Related Experiment Videos

Does competitive divergence occur if assortative mating is costly?

K A Schneider1, R Bürger

  • 1Department of Mathematics, University of Vienna, Wien, Austria.

Journal of Evolutionary Biology
|April 8, 2006
PubMed
Summary

Assortative mating costs can prevent sympatric speciation. Moderate choosiness costs allow divergence, but high costs and strong assortment reduce genetic variation, hindering speciation.

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Area of Science:

  • Evolutionary Biology
  • Population Genetics

Background:

  • Sympatric speciation models often ignore assortative mating costs.
  • Choosiness costs can impede speciation, contrary to some models.

Purpose of the Study:

  • Investigate how assortment strength and choosiness costs affect speciation.
  • Analyze a genetic model of a 'magic' trait influencing competition and mating.

Main Methods:

  • Analytical and numerical investigation of a haploid population model.
  • Examined parameters: selection, competition, assortment, and choosiness costs.
  • Studied trait determination by a single locus with multiple alleles.

Main Results:

  • No polymorphism or strong divergence can occur depending on parameters.

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  • Reproductive isolation is likely with intermediate/strong competition and very strong assortment.
  • Divergence is weakly affected by costs unless they are high.

    • Conclusions:

    • High choosiness costs, combined with strong assortment, deplete genetic variation and prevent divergence.
    • Speciation likelihood depends on the interplay between competition, assortment strength, and choosiness costs.