Inclusive fitness consequences of dispersal decisions in a cooperatively breeding bird, the long-tailed tit (Aegithalos caudatus)
Inclusive fitness consequences of dispersal decisions in a cooperatively breeding bird, the long-tailed tit (Aegithalos caudatus)
复制标题
DOI：
10.1073/pnas.1815873115
复制
发表时间：
2018-11-20
影响因子：
11.1
通讯作者：
Hatchwell, Ben J.
中科院分区：
文献类型：
--
作者：
Green, Jonathan P.;Hatchwell, Ben J.
出生分散是一种人口特征，具有深刻的进化、生态和行为后果。然而，由于难以衡量不同扩散策略在自然种群中的相对适宜性后果，我们对扩散模式的适应价值的理解严重受阻。这在社会物种中尤其如此，在这种物种中，出生亲缘关系允许进行亲缘选择，因此在评估分散选择时，必须考虑包容性适合度的直接和间接成分。在这里，我们使用来自合作繁殖者的长期研究的终生繁殖成功数据，长尾山雀，尾巴山雀，来量化包容性适合度的直接和间接成分。我们发现，分散对雄性个体间接适合度的增加有负面影响，因此对包容性适合度也有负面影响。相比之下，雌性的包容性，主要是直接的适合度随着传播距离的增加而增加。我们的结论是，在该物种中扩散的相互冲突的适合度结果导致了在这一关键人口统计学参数上的性别对抗选择。
Natal dispersal is a demographic trait with profound evolutionary, ecological, and behavioral consequences. However, our understanding of the adaptive value of dispersal patterns is severely hampered by the difficulty of measuring the relative fitness consequences of alternative dispersal strategies in natural populations. This is especially true in social species, in which natal philopatry allows kin selection to operate, so direct and indirect components of inclusive fitness have to be considered when evaluating selection on dispersal. Here, we use lifetime reproductive success data from a long-term study of a cooperative breeder, the long-tailed tit Aegithalos caudatus, to quantify the direct and indirect components of inclusive fitness. We show that dispersal has a negative effect on the accrual of indirect fitness, and hence inclusive fitness, by males. In contrast, the inclusive, predominantly direct, fitness of females increases with dispersal distance. We conclude that the conflicting fitness consequences of dispersal in this species result in sexually antagonistic selection on this key demographic parameter.