Variation in helper effort among cooperatively breeding bird species is consistent with Hamilton's Rule.
Variation in helper effort among cooperatively breeding bird species is consistent with Hamilton's Rule.
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DOI：
10.1038/ncomms12663
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发表时间：
2016-08-24
影响因子：
16.6
通讯作者：
Hatchwell BJ
中科院分区：
文献类型：
--
作者：
Green JP;Freckleton RP;Hatchwell BJ
在合作育种系统中，帮手的投资在物种之间变化很大，但这种变化目前还无法解释。包容性健身理论预测，在其他条件相同的情况下，合作投资应该与帮助者与其护理对象的相关性呈正相关。我们测试这一预测在36个合作繁殖鸟类的帮手投资的比较分析。我们发现，物种特定的帮手合作育雏的贡献增加帮手和收件人之间的平均相关性的增加。帮手的贡献也与帮手的性别比例有关，但无论是组的大小，也不与帮手的巢穴的比例影响帮手的努力。我们的研究结果支持这一假设，即合作繁殖的鸟类之间的帮助行为的变化是一致的汉密尔顿的规则，表明在社会鸟类的合作投资的演变亲属选择的关键作用。 在许多物种中，非父母帮助者有助于照顾后代;然而，提供的照顾量在不同物种之间有很大差异。绿色等人对36种合作繁殖鸟类的助人行为进行了系统发育比较分析，发现助人行为随着与被照顾者的关系而增加。
Investment by helpers in cooperative breeding systems is extremely variable among species, but this variation is currently unexplained. Inclusive fitness theory predicts that, all else being equal, cooperative investment should correlate positively with the relatedness of helpers to the recipients of their care. We test this prediction in a comparative analysis of helper investment in 36 cooperatively breeding bird species. We show that species-specific helper contributions to cooperative brood care increase as the mean relatedness between helpers and recipients increases. Helper contributions are also related to the sex ratio of helpers, but neither group size nor the proportion of nests with helpers influence helper effort. Our findings support the hypothesis that variation in helping behaviour among cooperatively breeding birds is consistent with Hamilton's rule, indicating a key role for kin selection in the evolution of cooperative investment in social birds. Non-parental helpers contribute to offspring care in many species; however, the amount of care provided varies considerably across species. Here, Green et al. perform a phylogenetic comparative analysis of helping behavior in 36 cooperatively-breeding bird species and find that helper effort increases with relatedness to the recipient of care.