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Related Experiment Video

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Observation and Quantification of Mating Behavior in the Pinewood Nematode, Bursaphelenchus xylophilus
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Quantifying inbreeding avoidance through extra-pair reproduction.

Jane M Reid1, Peter Arcese, Lukas F Keller

  • 1School of Biological Sciences, Institute of Biological and Environmental Sciences, Zoology Building, University of Aberdeen, Tillydrone Avenue, Aberdeen, AB24 2TZ, Scotland. jane.reid@abdn.ac.uk.

Evolution; International Journal of Organic Evolution
|October 28, 2014
PubMed
Summary
This summary is machine-generated.

Females may avoid inbreeding via extra-pair reproduction, but song sparrow data suggest this effect might be an illusion. Early offspring survival biases could explain observed patterns, challenging the inbreeding avoidance hypothesis.

Keywords:
Inbreeding depressionkinshipmate choicepaternitypolyandryrelatedness

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Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Population genetics

Background:

  • Extra-pair reproduction is theorized as a strategy for females to avoid inbreeding with related social partners.
  • Previous studies suggest females engage in extra-pair mating to increase offspring genetic diversity.

Purpose of the Study:

  • To investigate if song sparrows (Melospiza melodia) use extra-pair reproduction to avoid inbreeding.
  • To assess the influence of kinship and inbreeding depression on extra-pair mating decisions.

Main Methods:

  • Analysis of multigenerational song sparrow pedigree data.
  • Statistical modeling to assess inbreeding coefficients and relatedness.
  • Simulations to account for potential biases from early offspring mortality.

Main Results:

  • Extra-pair offspring exhibited lower average inbreeding coefficients than within-pair offspring.
  • The likelihood of extra-pair reproduction increased with female relatedness to her social partner.
  • Simulations indicated that inbreeding depression in early survival could create these observed patterns.

Conclusions:

  • The hypothesis that song sparrows actively avoid inbreeding through extra-pair reproduction cannot be definitively rejected.
  • Observed patterns may be influenced by biases related to inbreeding depression in early development.
  • Existing evidence for female inbreeding avoidance via extra-pair mating warrants reevaluation.