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Group selection on a quantitative character.

M Slatkin1, M J Wade

  • 1Department of Biophysics and Theoretical Biology, University of Chicago, Chicago, Illinois 60637.

Proceedings of the National Academy of Sciences of the United States of America
|July 1, 1978
PubMed
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Group selection models reveal that the propagule pool method, unlike the migrant pool method, can maintain more genetic variance between populations. This suggests group selection may be more effective in nature than previously thought.

Area of Science:

  • Evolutionary biology
  • Population genetics
  • Quantitative genetics

Background:

  • Group selection models are crucial for understanding evolution beyond individual traits.
  • Previous models often assumed a 'migrant pool' colonization strategy, potentially limiting group selection's efficacy.
  • Quantitative characters are influenced by multiple genetic and environmental factors.

Purpose of the Study:

  • To model group and individual selection on quantitative traits.
  • To compare the effects of two distinct colonization methods: migrant pool and propagule pool.
  • To assess how colonization strategy impacts the effectiveness of group selection.

Main Methods:

  • Developed a quantitative genetic model of group and individual selection.

Related Experiment Videos

  • Modeled two colonization scenarios: a 'migrant pool' with complete mixing and a 'propagule pool' with single-population derivation.
  • Analyzed the maintenance of between-population genetic variance under each model.

    • Main Results:

    • The propagule pool model allows for significantly greater maintenance of between-population genetic variance compared to the migrant pool model.
    • Complete mixing in the migrant pool model leads to rapid homogenization and reduced between-population variance.
    • The propagule pool model preserves population structure, facilitating stronger group selection.

    Conclusions:

    • Colonization strategy is a critical factor influencing the effectiveness of group selection.
    • The propagule pool model provides a more realistic framework for understanding group selection in many natural populations.
    • Group selection may be a more potent evolutionary force than previously estimated, particularly with non-random colonization.