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Related Experiment Videos

When not to avoid inbreeding.

Hanna Kokko1, Indrek Ots

  • 1Laboratory of Ecological and Evolutionary Dynamics, Department of Biological and Environmental Science, University of Helsinki, Finland. hanna.kokko@helsinki.fi

Evolution; International Journal of Organic Evolution
|April 28, 2006
PubMed
Summary

Animals may avoid incestuous mating due to inbreeding depression, but a hidden benefit exists. Mating with relatives can increase inclusive fitness by spreading shared genes, a factor often overlooked in evolutionary studies.

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Area of Science:

  • Evolutionary Biology
  • Behavioral Ecology
  • Genetics

Background:

  • Inbreeding avoidance is common in animals, primarily attributed to inbreeding depression.
  • A theoretical benefit of inbreeding, increasing inclusive fitness via shared genes, is often neglected.
  • This benefit is analogous to selfing in plants, where related mating is known to be advantageous.

Purpose of the Study:

  • To model inbreeding tolerance in animals across various life histories and parental investment strategies.
  • To investigate how simultaneous versus sequential mate choice influences inbreeding tolerance.
  • To reconcile theoretical predictions with empirical observations of incestuous mating behavior.

Main Methods:

  • Developed a theoretical model to calculate expected inbreeding tolerance.

Related Experiment Videos

  • Differentiated between simultaneous and sequential mate choice scenarios.
  • Analyzed the impact of parental care systems on inbreeding tolerance.

    • Main Results:

    • Inbreeding tolerance can be remarkably high, especially in sequential mate choice.
    • Egalitarian parental care is predicted to decrease inbreeding tolerance.
    • A significant mismatch exists between predicted inbreeding tolerance and observed incestuous mating behaviors.

    Conclusions:

    • Theoretical models predict substantial inbreeding tolerance, yet incestuous mating is rarely observed.
    • The high predicted tolerance suggests factors beyond simple mate availability may explain observed avoidance.
    • Further research is needed to resolve the discrepancy between theory and empirical data on incestuous mating.