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Disruptive sexual selection for plumage coloration in a passerine bird

机译：破坏性的性选择，用于雀形目鸟类的羽毛着色

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摘要

The theory of sexual selection was developed to explain the evolution of highly exaggerated sexual ornaments. Now supported by vast empirical evidence, sexual selection is generally considered to favour individuals with the most extreme trait expression. Here we describe disruptive selection on a sexual ornament, plumage coloration, in yearling male lazuli buntings (Passerina amoena). In habitats with limited good-quality nesting cover, the dullest and the brightest yearlings were more successful in obtaining high-quality territories, pairing with females and siring offspring, than yearlings with intermediate plumage. This pattern reflects the way that territorial adult males vary levels of aggression to influence the structure of their social neighbourhood. Adult males showed less aggression towards dull yearlings than intermediate and bright ones, permitting the dull yearlings to settle on good territories nearby. Fitness comparisons based on paternity analyses showed that both the adults and dull yearlings benefited genetically from this arrangement, revealing a rare example of sexually selected male-male cooperation.
机译：性选择理论的发展是为了解释高度夸张的性装饰品的演变。现在有大量的经验证据支持，性别选择通常被认为有利于具有最极端特质表达的个体。在这里，我们描述一岁雄性z（Passerina amoena）对性装饰品，羽毛着色的破坏性选择。在优质套巢数量有限的栖息地中，最迟钝和最亮的一岁鸽比中等羽毛的一岁鸽更能成功地获得高质量的领土，与雌性配对并育成后代。这种模式反映了成年男性改变侵略程度以影响其社会邻里结构的方式。成年雄性对沉闷一岁的侵略性要比中等和明亮的一岁少，这使得沉闷一岁的雄性定居在附近的好地区。根据亲子关系分析进行的体能比较显示，成年和沉闷的一岁鸽均可从这种安排中受益，这在性别选择上表现出罕见。

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