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Title: Helping effort increases with relatedness in bell miners, but 'unrelated' helpers of both sexes still provide substantial care
Contributor(s): Wright, Jonathan (author); McDonald, Paul  (author)orcid ; Marvelde, Luc te (author); Kazem, Anahita J N (author); Bishop, Charles M (author)
Publication Date: 2010
DOI: 10.1098/rspb.2009.1360
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Abstract: Indirect fitness benefits from kin selection can explain why non-breeding individuals help raise the young of relatives. However, the evolution of helping by non-relatives requires direct fitness benefits, for example via group augmentation. Here, we examine nest visit rates, load sizes and prey types delivered by breeding pairs and their helpers in the cooperatively breeding bell miner ('Manorina melanophrys'). In this system, males remain in their natal colony while young females typically disperse, and helpers of both sexes often assist at multiple nests concurrently. We found extremely clear evidence for the expected effect of genetic relatedness on individual helping effort per nest within colonies. This positive incremental effect of kinship was facultative - i.e. largely the result of within-individual variation in helping effort. Surprisingly, no sex differences were detectable in any aspect of helping, and even non-relatives provided substantial aid. Helpers and breeders of both sexes regulated their provisioning effort by responding visit-by-visit to changes in nestling begging. Helping behaviour in bell miners therefore appears consistent with adaptive cooperative investment in the brood, and kin-selected care by relatives. Similar investment by 'unrelated' helpers of both sexes argues against direct fitness benefits, but is perhaps explained by kin selection at the colony level.
Publication Type: Journal Article
Source of Publication: Proceedings of the Royal Society B: Biological Sciences, v.277, p. 437-445
Publisher: The Royal Society Publishing
Place of Publication: London, United Kingdom
ISSN: 0962-8452
Field of Research (FOR): 060201 Behavioural Ecology
060801 Animal Behaviour
060304 Ethology and Sociobiology
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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