The evolution of signal design in manakin plumage ornaments
The evolution of signal design in manakin plumage ornaments
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DOI：
10.1086/510162
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发表时间：
2007-01-01
影响因子：
2.9
通讯作者：
Hill, Geoffrey E.
中科院分区：
文献类型：
--
作者：
Doucet, Stephanie M.;Mennill, Daniel J.;Hill, Geoffrey E.
动物信号的特征在于两个设计组件：功效（可检测性）和内容（传达的信息）。选择有效的信号感知应该有利于性状的进化，表现出这两个设计组件之间的最佳平衡。我们研究了侏儒鸟（鸟类：Pipridae）彩色羽毛装饰物中信号设计的进化。我们使用了一个模型的鸟类颜色空间来量化的差异，羽毛颜色将被视为一个典型的雀形目鸟类和研究模式的着色在50种侏儒鸟。使用非遗传学独立的对比，我们表明，羽毛对比度对背景的增加与性二色性的男性，但不是女性，这表明性选择有利于男性羽毛饰品的进化，提高信号的功效。个体内的羽毛对比度也增加了男性，但不是女性的二色性。最后，羽毛颜色由不同的机制产生，这可能揭示不同方面的质量，导致与背景的对比度不同。我们的研究结果表明，信号功效和内容的选择有时可能是相反的，在信号设计的这两个组成部分之间建立权衡。Manakins可能通过组合多种功效和内容不同的羽毛装饰物来调解这种权衡。
Animal signals are characterized by two design components: efficacy (detectability) and content (message being conveyed). Selection for efficient signal perception should favor the evolution of traits that exhibit an optimal balance between these two design components. We examined the evolution of signal design in the colorful plumage ornaments of manakins (Aves: Pipridae). We used a model of avian color space to quantify how differences in plumage coloration would be perceived by a typical passerine bird and examined patterns of coloration across 50 species of manakin. Using phylogenetically independent contrasts, we show that plumage contrast against the background increases with sexual dichromatism in males but not females, suggesting that sexual selection has favored the evolution of male plumage ornaments that enhance signal efficacy. Plumage contrast within individuals also increased with dichromatism in males but not females. Finally, plumage colors produced by different mechanisms, which may reveal different aspects of quality, resulted in different degrees of contrast against the background. Our findings suggest that selection for signal efficacy and content may sometimes be opposing, creating a trade-off between these two components of signal design. Manakins may mediate this trade-off by combining multiple plumage ornaments that differ in efficacy and content.