Receiver discriminability drives the evolution of complex sexual signals by sexual selection
Receiver discriminability drives the evolution of complex sexual signals by sexual selection
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接收器辨别力通过性选择驱动复杂性信号的进化
DOI：
10.1111/evo.12889
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发表时间：
2016-04-01
期刊：
影响因子：
3.3
通讯作者：
Ryan, Michael J.
中科院分区：
文献类型：
--
作者：
Cui, Jianguo;Song, Xiaowei;Ryan, Michael J.
择偶性选择的一个标志是夸张特征的进化，例如鸟类的尾巴更长，鸟类和青蛙的叫声中含有更多的声音成分。性状的阐述可能会因新陈代谢增加和捕食风险增加等成本而受到阻碍，但接收者的认知过程也可能会阻碍性状的阐述。例如，根据韦伯定律，随着绝对大小的增加，固定绝对差异的特征将更难以区分。在这里，我们发现，峨眉音乐蛙（Babina daunchina）在雄性广告叫声中连续音符之间的基频增加，这增加了叫声的频谱复杂性，有利于雌性比较叫声之间音符数量的能力。这些结果表明，女性的辨别力提供了从增强信号幅度（即在呼叫中添加更多音符）到采用新信号特征（即增加音符之间的频率）以增加复杂性的转变的动力。我们认为，增加音符的光谱复杂性可以改善韦伯定律的一些影响，并强调选择者的感知和认知偏差如何对求爱信号的演变产生重要影响。
A hallmark of sexual selection by mate choice is the evolution of exaggerated traits, such as longer tails in birds and more acoustic components in the calls of birds and frogs. Trait elaboration can be opposed by costs such as increased metabolism and greater predation risk, but cognitive processes of the receiver can also put a brake on trait elaboration. For example, according to Weber's Law traits of a fixed absolute difference will be more difficult to discriminate as the absolute magnitude increases. Here, we show that in the Emei music frog (Babina daunchina) increases in the fundamental frequency between successive notes in the male advertisement call, which increases the spectral complexity of the call, facilitates the female's ability to compare the number of notes between calls. These results suggest that female's discriminability provides the impetus to switch from enhancement of signaling magnitude (i.e., adding more notes into calls) to employing a new signal feature (i.e., increasing frequency among notes) to increase complexity. We suggest that increasing the spectral complexity of notes ameliorates some of the effects of Weber's Law, and highlights how perceptual and cognitive biases of choosers can have important influences on the evolution of courtship signals.