Nepotism and subordinate tenure in a cooperative breeder
Nepotism and subordinate tenure in a cooperative breeder
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DOI：
10.1098/rsbl.2016.0365
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发表时间：
2016-08-01
期刊：
影响因子：
3.3
通讯作者：
Ridley, Amanda R.
中科院分区：
文献类型：
--
作者：
Nelson-Flower, Martha J.;Ridley, Amanda R.
在许多合作繁殖的社会中，从属个体延迟了扩散和独立繁殖。下属延迟扩散（下属任期）的时间长度可能有重要的影响，下属和主导健身。然而，对男性和女性的下属保有权进行定量比较的情况很少，特别是在同性近亲与异性近亲的存在方面。在这里，我们调查下属任期和下属和显性之间的遗传关系的影响，在合作繁殖的南方画眉（Turdoides bicolor）。我们发现，男性，较长的从属任期的结果增加的可能性，实现主导地位。在一个无关的主导男性的存在下，从属男性的任期显着较短，表明男性之间的裙带关系。女性的任期不受与占统治地位的男性或女性的遗传关系的影响。这些结果是一些第一次证明，性别的优势和下属，他们之间的遗传关系，可以有显着的影响下属的任期和分散延迟。裙带关系可能在这个物种合作繁殖的进化中发挥了至关重要的作用。
In many cooperatively breeding societies, subordinate individuals delay dispersal and independent breeding. The length of time that subordinates delay dispersal (subordinate tenure) is likely to have important implications for both subordinate and dominant fitness. However, quantitative comparisons of the subordinate tenure of males and females are rare, especially with respect to the presence of same-versus opposite-sex close kin. Here, we investigate subordinate tenure and how it is affected by the genetic relationship between subordinates and dominants in the cooperatively breeding southern pied babbler (Turdoides bicolor). We find that for males, longer subordinate tenures result in increased likelihood of attaining dominance. In the presence of an unrelated dominant male, tenure of subordinate males is significantly shorter, indicating nepotism among males. Female tenures are unaffected by the genetic relationship to either the dominant male or female. These results are some of the first to demonstrate that the sex of both the dominants and subordinates, and the genetic relationship between them, can have significant impacts on subordinate tenure and dispersal delays. Nepotism has likely played a vital role in the evolution of cooperative breeding in this species.