Heritable victimization and the benefits of agonistic relationships
Heritable victimization and the benefits of agonistic relationships
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DOI：
10.1073/pnas.1009882107
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发表时间：
2010-12-14
影响因子：
11.1
通讯作者：
Martin, Julien G. A.
中科院分区：
文献类型：
--
作者：
Lea, Amanda J.;Blumstein, Daniel T.;Martin, Julien G. A.
在这里，我们提出了对单个种群中网络特征的遗传力和选择的估计，使我们能够解决社会行为的进化潜力以及社会性和适应性之间鲜为人知的联系。要进化，社会性必须有一些可遗传的基础，然而社会关系的遗传性在很大程度上是未知的。社会网络分析和数量遗传学的最新进展使我们能够量化社会关系的属性，并估计它们在自由生活人口中的遗传力。我们的分析涉及到各种衡量标准(入度、出度、吸引力、扩张性、嵌入性和介介性)，我们假设，反映由个人控制的关系的特征(即，个人发起或直接参与的那些)比主要基于同种人的行为的特征更具遗传性。识别遗传力和相关性状的选择模式可能有助于洞察哪些类型的关系在动物社会中是重要的。正如预期的那样，我们发现间接测量的差异在很大程度上是由非遗传差异解释的。然而，令人惊讶的是，捕捉初始交互作用的性状并不具有显著的加性遗传变异，而接收到的交互作用的测量是可遗传的。描述发起的攻击性和在竞争网络中的地位的指标正在选择中(垂直条S垂直条0.4)，尽管有利的特征值不会被后代遗传。看起来，争强好胜的关系会对健康产生积极影响，而看似昂贵或有害的关系实际上可能是有益的。我们的研究强调了研究竞争关系和从属关系的重要性，以充分理解社会性和适合性之间的联系。
Here, we present estimates of heritability and selection on network traits in a single population, allowing us to address the evolutionary potential of social behavior and the poorly understood link between sociality and fitness. To evolve, sociality must have some heritable basis, yet the heritability of social relationships is largely unknown. Recent advances in both social network analyses and quantitative genetics allow us to quantify attributes of social relationships and estimate their heritability in free-living populations. Our analyses addressed a variety of measures (in-degree, out-degree, attractiveness, expansiveness, embeddedness, and betweenness), and we hypothesized that traits reflecting relationships controlled by an individual (i.e., those that the individual initiated or were directly involved in) would be more heritable than those based largely on the behavior of conspecifics. Identifying patterns of heritability and selection among related traits may provide insight into which types of relationships are important in animal societies. As expected, we found that variation in indirect measures was largely explained by nongenetic variation. Yet, surprisingly, traits capturing initiated interactions do not possess significant additive genetic variation, whereas measures of received interactions are heritable. Measures describing initiated aggression and position in an agonistic network are under selection (0.3 < vertical bar S vertical bar < 0.4), although advantageous trait values are not inherited by offspring. It appears that agonistic relationships positively influence fitness and seemingly costly or harmful ties may, in fact, be beneficial. Our study highlights the importance of studying agonistic as well as affiliative relationships to understand fully the connections between sociality and fitness.