Dispersal of sibling coalitions promotes helping among immigrants in a cooperatively breeding bird
Dispersal of sibling coalitions promotes helping among immigrants in a cooperatively breeding bird
复制标题
兄弟姐妹联盟的分散促进了移民之间合作繁殖鸟类的帮助
DOI：
10.1098/rspb.2008.0398
复制
发表时间：
2008
期刊：
影响因子：
--
通讯作者：
B. Hatchwell
中科院分区：
文献类型：
--
作者：
S. P. Sharp;Michelle Simeoni;B. Hatchwell
亲缘选择是社会进化的主要力量，但人们通常认为分散是通过稀释亲缘关系来减少其影响。在大多数合作繁殖的脊椎动物中，两个以上的个体照顾幼崽，幼崽推迟了扩散，并成为家庭群体的帮手。然而，在长尾山雀（Aegithalos caudatus）中，后代分散繁殖，助手是优先帮助亲属的失败繁殖者。帮助也发生在移民中，但他们的来源不明，在这些情况下的合作也知之甚少。在这里，我们结合研究种群的长期人口统计和遗传数据来调查移民和帮助这个物种。我们首先使用了一种新的亲子关系分析的应用来区分移民和未知的慈善新兵。然后，我们用两两相关性估计交叉检验了兄弟姐妹关系重建，结果表明移民分散在兄弟姐妹联盟中，他们之间的帮助是亲属偏见的。这些结果表明，在没有延迟扩散的情况下，分散不一定会排除社会性，亲属联盟的分散可能有助于维持亲属选择的合作。
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.