Dispersal of sibling coalitions promotes helping among immigrants in a cooperatively breeding bird

Sharp, Stuart P. and Simeoni, Michelle and Hatchwell, Ben J. (2008) Dispersal of sibling coalitions promotes helping among immigrants in a cooperatively breeding bird. Proceedings of the Royal Society B: Biological Sciences, 275 (1647). pp. 2125-2130. ISSN 0962-8452

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Abstract

Kin selection is a major force in social evolution, but dispersal is often assumed to reduce its impact by diluting kinship. In most cooperatively breeding vertebrates, in which more than two individuals care for young, juveniles delay dispersal and become helpers in family groups. In long-tailed tits (Aegithalos caudatus), however, offspring disperse to breed and helpers are failed breeders that preferentially aid kin. Helping also occurs among immigrants, but their origins are unknown and cooperation in these cases is poorly understood. Here, we combine long-term demographic and genetic data from our study population to investigate immigration and helping in this species. We first used a novel application of parentage analysis to discriminate between immigrants and unknown philopatric recruits. We then cross-checked sibship reconstruction with pairwise relatedness estimates to show that immigrants disperse in sibling coalitions and helping among them is kin biased. These results indicate that dispersal need not preclude sociality, and dispersal of kin coalitions may help maintain kin-selected cooperation in the absence of delayed dispersal.

Item Type:
Journal Article
Journal or Publication Title:
Proceedings of the Royal Society B: Biological Sciences
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2700
Subjects:
ID Code:
60916
Deposited By:
Deposited On:
07 Jan 2013 12:49
Refereed?:
Yes
Published?:
Published
Last Modified:
15 Jul 2020 03:42