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Most animals do not avoid mating with relatives, contrary to common belief. This meta-analysis of 139 studies found unbiased mating is widespread, challenging the assumption of inbreeding avoidance in animal behavior research.

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Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Genetics

Background:

  • Inbreeding depression is a known consequence of mating with relatives.
  • Theoretical models suggest unbiased or even kin-preferential mating can be adaptive.
  • Empirical evidence for widespread kin avoidance in animals is surprisingly scarce.

Purpose of the Study:

  • To meta-analyze experimental studies on kin mating choice in animals.
  • To assess the prevalence of inbreeding avoidance across taxa and conditions.
  • To identify factors influencing kin mating decisions.

Main Methods:

  • Meta-analysis of 677 effect sizes from 139 experimental studies.
  • Data collected over 40 years of research on diploid animals.
  • Meta-regression analysis to explore moderator effects.

Main Results:

  • Little support for widespread inbreeding avoidance was found.
  • Unbiased mating with respect to kinship is prevalent.
  • Publication bias was detected, but did not fully explain the results.
  • Degree of relatedness and prior kin experience influenced mating choices.
  • No significant differences in kin avoidance were observed between sexes, experimental types, or species (including humans).

Conclusions:

  • The assumption that animals inherently avoid mating with kin needs re-evaluation.
  • Unbiased mating is a common strategy in the animal kingdom.
  • Further research should explore the adaptive significance of unbiased mating and the nuanced factors influencing kin recognition in mate choice.