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Age-dependent changes in infidelity in Seychelles warblers.

Sara Raj Pant1,2, Martijn Hammers2, Jan Komdeur2

  • 1Centre for Ecology, Evolution and Conservation, School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, UK.

Molecular Ecology
|July 25, 2020
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Summary
This summary is machine-generated.

Extra-pair paternity (EPP) in Seychelles warblers changes with age, with both sexes showing an initial increase and later decline. Older males are less likely to be cuckolded, challenging quality-based hypotheses for EPP.

Keywords:
ageextra-pair paternityselective appearance and disappearancesenescencewithin-individual effect

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Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Ornithology

Background:

  • Extra-pair paternity (EPP) is linked to male age in socially monogamous species.
  • Previous studies suggest older males gain more EPP or are preferred by females.
  • Age-related changes in female extra-pair reproduction are poorly understood.

Purpose of the Study:

  • Investigate age-related changes in extra-pair reproduction within individuals for both sexes.
  • Test whether EPP patterns are driven by individual aging or by female preference for long-lived males.
  • Examine the role of EPP in male reproductive success and evidence for senescence in infidelity.

Main Methods:

  • Longitudinal study of 18 years on individually marked Seychelles warblers (Acrocephalus sechellensis).
  • Analysis of within-individual changes in extra-pair reproduction across the lifespan.
  • Quantification of EPP's contribution to male reproductive success.

Main Results:

  • Both male and female extra-pair reproduction showed within-individual increases early in life and declines later.
  • Males experienced reduced rates of being cuckolded as they aged.
  • EPP contributed significantly to male reproductive success, up to 50%.

Conclusions:

  • Age-related EPP patterns are primarily due to within-individual aging, not differences in male quality or longevity.
  • Findings challenge the hypothesis that females seek high-quality genes via older males.
  • Evidence of senescence in infidelity observed in both sexes, with post-peak declines in extra-pair reproduction.