Helpers compensate for age-related declines in parental care and offspring survival in a cooperatively breeding bird.
Helpers compensate for age-related declines in parental care and offspring survival in a cooperatively breeding bird.
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DOI：
10.1002/evl3.213
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发表时间：
2021-04
影响因子：
5
通讯作者：
Komdeur J
中科院分区：
文献类型：
--
作者：
Hammers M;Kingma SA;van Boheemen LA;Sparks AM;Burke T;Dugdale HL;Richardson DS;Komdeur J
由于父母的衰老，年迈父母的后代存活率往往较低。在合作繁殖物种中，育种者和帮助者共享后代护理，帮助者提供的异地护理预计将减轻父母衰老对后代供应的影响，并随后减轻后代存活的影响。我们使用合作繁育塞舌尔林莺(Acrocephalus Sechellens)的长期研究数据来验证这一预测。我们发现，雌性育种者的雏鸟配给率随着年龄的增长而下降。此外，随着雌性育种者年龄的增长，总的育种率和后代的第一年存活概率逐渐下降，但当有帮手在场时，这些下降会得到缓解。这种效果的产生并不是因为个体饲养员提供了更多的照顾，而是因为年长的雌性育种者招募了更多的饲养员，从而得到了对其幼崽的更全面的照顾。我们没有发现这种对雄性育种者的影响。这些结果表明，异地饲养可以减轻育种者衰老的健康成本，这表明年龄和合作繁殖之间存在相互作用。
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.