The role of relatedness in structuring the social network of a wild guppy population
The role of relatedness in structuring the social network of a wild guppy population
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DOI：
10.1007/s00442-012-2379-8
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发表时间：
2012-12-01
期刊：
影响因子：
2.7
通讯作者：
Tyler, C. R.
中科院分区：
文献类型：
--
作者：
Croft, Darren P.;Hamilton, P. B.;Tyler, C. R.
相关性在构建动物社会中的作用引起了人们极大的兴趣。虽然大量研究记录了实验室条件下浅滩鱼类的亲属识别，但几乎没有证据表明相关性在以裂变-融合动态为特征的野生种群中构建社会互动中发挥着重要作用。以前的工作倾向于比较整个浅滩内部和之间的相关性。然而，这种方法无法检测群体内的社会子结构，而这似乎是驱动裂变聚变动物社会的社会组织的主要因素。在这里，我们使用社交网络分析与 DNA 微卫星基因分型相结合来研究相关性在野生孔雀鱼 (Poecilia reticulata) 群体中构建社会关系中的作用。与之前的研究结果一致，女性与女性之间的二人组形成了最牢固的社会关系，并且随着时间的推移而保持稳定。有趣的是，我们还观察到男性与男性互动的显着共现，这与之前的工作形成鲜明对比。尽管我们观察到人口中的社会亚结构，但我们没有发现任何证据表明相关性在支撑这种结构方面发挥着重要作用。事实上，在 180 条基因分型的鱼类中，仅鉴定出 7 个一级亲属，这表明大多数个体在种群中没有一级亲属。在该种群中观察到的高遗传多样性表明低地孔雀鱼种群的有效种群规模很大。我们在社会组织进化以及可能驱动野生种群中观察到的模式的机制和约束的背景下讨论我们的发现。
The role of relatedness in structuring animal societies has attracted considerable interest. Whilst a significant number of studies have documented kin recognition in shoaling fish under laboratory conditions, there is little evidence that relatedness plays a significant role in structuring social interactions in wild populations that are characterised by fission-fusion dynamics. Previous work has tended to compare relatedness within and among entire shoals. Such an approach however, does not have the ability to detect social sub-structuring within groups, which appears to be a major factor driving the social organisation of fission-fusion animal societies. Here, we use social network analysis combined with DNA microsatellite genotyping to examine the role of relatedness in structuring social relationships in a wild population of guppies (Poecilia reticulata). Consistent with previous findings, female-female dyads formed the strongest social relationships, which were stable over time. Interestingly, we also observed significant co-occurrence of male-male interactions, which is in contrast to previous work. Although we observed social sub-structuring in the population, we found no evidence for relatedness playing a significant role in underpinning this structure. Indeed, only seven first-degree relative dyads were identified among the 180 fish genotyped, indicating that the majority of individuals do not have a first-degree relative in the population. The high genetic diversity observed in this population is indicative of a large effective population size typical of lowland guppy populations. We discuss our findings in the context of the evolution of social organisation and the mechanisms and constraints that may drive the observed patterns in wild populations.