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The dynamics of cohort selection.

J F Boyer1, D B Mertz

  • 1Department of Biological Sciences, Union College, Schenectady, New York 12308.

Journal of Theoretical Biology
|February 9, 1990
PubMed
Summary
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Cohort selection, driven by genetic variation in interference behavior, significantly impacts evolutionary rates in age-structured populations. This process explains the persistence of spiteful behaviors in animals.

Area of Science:

  • Evolutionary biology
  • Population genetics
  • Behavioral ecology

Background:

  • Cohort selection is a directional evolutionary process.
  • It arises from genetically influenced variations in interference behavior between age groups.
  • This selection assumes equal susceptibility to interference and no direct benefit to the interfering genotype.

Purpose of the Study:

  • To explore the dynamics of cohort selection in age-structured populations.
  • To determine the key factors influencing evolutionary rates under cohort selection.
  • To analyze frequency-dependent effects and the generality of cohort selection.

Main Methods:

  • Computer simulations were employed.
  • A single-locus, two-allele model was utilized.

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  • Key parameters included allele frequency, population size, interference intensity, and reproductive apportionment.

    • Main Results:

    • Evolutionary rates are significantly influenced by allele frequency, population size, interference intensity, and reproductive apportionment.
    • Frequency-dependent effects were observed and analyzed.
    • The simulations demonstrated the broad applicability of cohort selection.

    Conclusions:

    • Cohort selection is a distinct form of natural selection.
    • It may be a crucial factor in the evolutionary persistence of interference and spiteful behaviors in animal populations.