Helpers compensate for age‐related declines in parental care and offspring survival in a cooperatively breeding bird

Hammers, Martijn, Kingma, Sjouke A., Boheemen, Lotte A., Sparks, Alexandra M., Burke, Terry, Dugdale, Hannah L., Richardson, David S. and Komdeur, Jan (2021) Helpers compensate for age‐related declines in parental care and offspring survival in a cooperatively breeding bird. Evolution Letters, 5 (2). pp. 143-153. ISSN 2056-3744

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Abstract

Offspring from elderly parents often have lower survival due to parental senescence. In cooperatively breeding species, where offspring care is shared between breeders and helpers, the alloparental care provided by helpers is predicted to mitigate the impact of parental senescence on offspring provisioning and, subsequently, offspring survival. We test this prediction using data from a long‐term study on cooperatively breeding Seychelles warblers (Acrocephalus sechellensis). We find that the nestling provisioning rate of female breeders declines with their age. Further, the total brood provisioning rate and the first‐year survival probability of offspring decline progressively with age of the female breeder, but these declines are mitigated when helpers are present. This effect does not arise because individual helpers provide more care in response to the lower provisioning of older dominant females, but because older female breeders have recruited more helpers, thereby receiving more overall care for their brood. We do not find such effects for male breeders. These results indicate that alloparental care can alleviate the fitness costs of senescence for breeders, which suggests an interplay between age and cooperative breeding.

Item Type: Article
Uncontrolled Keywords: ageing,cooperative breeding,parental care,senescence,sociality,ecology, evolution, behavior and systematics,genetics ,/dk/atira/pure/subjectarea/asjc/1100/1105
Faculty \ School: Faculty of Science > School of Biological Sciences
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Depositing User: LivePure Connector
Date Deposited: 30 Apr 2021 23:47
Last Modified: 30 Sep 2021 16:26
URI: https://ueaeprints.uea.ac.uk/id/eprint/79906
DOI: 10.1002/evl3.213

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