Disruptive viability selection on a black plumage trait associated with dominance.
Disruptive viability selection on a black plumage trait associated with dominance.
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DOI：
10.1111/jeb.12717
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发表时间：
2015-11
影响因子：
2.1
通讯作者：
Doutrelant C
中科院分区：
文献类型：
--
作者：
Acker P;Grégoire A;Rat M;Spottiswoode CN;van Dijk RE;Paquet M;Kaden JC;Pradel R;Hatchwell BJ;Covas R;Doutrelant C
在交流中使用的特征，如颜色信号，预计将有积极的影响，繁殖成功，但他们与生存的关联知之甚少。以前的研究主要研究信号和生存之间的线性关系，但驼峰形和U形关系也可以预测，这取决于性状表达所涉及的主要成本。此外，很少有研究在可行性选择分析中考虑信号的可塑性。信号表达和生存之间的关系在基于黑色素的性状中特别感兴趣，因为它们的主要成本仍然存在争议。在这里，我们首先确定了解释与优势相关的基于黑色素的性状变异性的主要因素：殖民鸟类的围兜大小，社交的织布者Philetairus socius。然后，我们使用这些分析来获得代表围兜尺寸的个体平均表达的测量。最后，我们使用捕获-再捕获模型来研究生存率与围兜大小的关系。围兜大小的变化受到强烈的影响，年和年龄，身体状况和殖民地大小的中度影响。此外，带有小围兜和大围兜的个体比带有中间围兜的个体具有更高的存活率，并且存活率和围兜大小之间的这种U形关系在某些年份比其他年份更明显。这些结果构成了一个罕见的破坏性的可行性选择的例子，并指向潜在的重要性，社会成本所产生的优势地位的徽章信号功能。
Traits used in communication, such as colour signals, are expected to have positive consequences for reproductive success, but their associations with survival are little understood. Previous studies have mainly investigated linear relationships between signals and survival, but both hump‐shaped and U‐shaped relationships can also be predicted, depending on the main costs involved in trait expression. Furthermore, few studies have taken the plasticity of signals into account in viability selection analyses. The relationship between signal expression and survival is of particular interest in melanin‐based traits, because their main costs are still debated. Here, we first determined the main factors explaining variability in a melanin‐based trait linked to dominance: the bib size of a colonial bird, the sociable weaver Philetairus socius. We then used these analyses to obtain a measure representative of the individual mean expression of bib size. Finally, we used capture–recapture models to study how survival varied in relation to bib size. Variation in bib size was strongly affected by year and moderately affected by age, body condition and colony size. In addition, individuals bearing small and large bibs had higher survival than those with intermediate bibs, and this U‐shaped relationship between survival and bib size appeared to be more pronounced in some years than others. These results constitute a rare example of disruptive viability selection, and point towards the potential importance of social costs incurred by the dominance signalling function of badges of status.