Shared parentage and incest avoidance in the cooperatively breeding acorn woodpecker

@article{Haydock2001SharedPA,
  title={Shared parentage and incest avoidance in the cooperatively breeding acorn woodpecker},
  author={Joseph Haydock and Walter D. Koenig and Mark Stanback},
  journal={Molecular Ecology},
  year={2001},
  volume={10}
}
Social groups of acorn woodpeckers (Melanerpesformicivorus) range in size from unaided pairs to 15 adults. Behavioural indicators of mate guarding, assumed incest avoidance and observations of egg‐laying indicate that social organization ranges from monogamous pairs to groups with up to seven male and three female putative cobreeders plus up to 10 nonbreeding helpers. In addition, groups occasionally lack a putative breeder throughout the breeding season. Here we report results from multilocus… 
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  • E. Berg
  • Biology
    Animal Behaviour
  • 2005
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TLDR
One, and possibly two, cases of incestuous breeding involving related helpers were found in a population of Brown-headed Nuthatches, and extra-group paternity appeared to be common at nests of both pairs and cooperative groups, but did not differ in frequency between the two nest types.
Helpers and egg investment in the cooperatively breeding acorn woodpecker: testing the concealed helper effects hypothesis
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Patterns of Reproductive Skew in the Polygynandrous Acorn Woodpecker
TLDR
It is suggested that models of reproductive skew will need to include competitive interactions among potential breeders and mate choice before they will adequately predict patterns of reproductive partitioning in most vertebrate societies.
Brooding, provisioning, and compensatory care in the cooperatively breeding acorn woodpecker
TLDR
Compensation, at least by breeders, was significantly lower during the first week of the nestling period than later on, supporting the hypothesis that compensatory reduction in care is less likely when brood reduction is more common and was not affected by the acorn crop.
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TLDR
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TLDR
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