Proximity of signallers can maintain sexual signal variation under stabilizing selection.

Proximity of signallers can maintain sexual signal variation under stabilizing selection.
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DOI:
10.1038/s41598-017-17327-9
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发表时间:
2017-12-22
期刊:
影响因子:
4.6
通讯作者:
Groot AT
Groot AT
中科院分区:
综合性期刊3区
文献类型:
--
作者:
van Wijk M;Heath J;Lievers R;Schal C;Groot AT

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性沟通系统如何在稳定选择下进化仍然是进化生物学中的一个悖论。在飞蛾中,雌性会释放出一种物种特异性的性信息素,其中包含生化相关成分的混合物,雄性会被这种信息素所吸引。尽管雄性似乎对雌性信息素施加了强烈的稳定选择,但这些混合物似乎进化得很快,大约 120,000 种蛾类就证明了这一点。在这里,我们提出并测试了一种“邻近模型”,其中对男性的相对吸引力不同的两名女性都可以从彼此靠近的通话中受益。在一项实地研究中,我们表明,(1)人工选择的无吸引力雌性如果在靠近有魅力的雌性时发出信号,则可以达到与有魅力的雌性相当的交配率;(2)有魅力的雌性在靠近无吸引力的雌性时发出信号时会受益于更高的交配率。我们提出,频率依赖的行为和空间相互作用可以维持群体内的信号变化,即使这些信号处于稳定选择之下。
How sexual communication systems can evolve under stabilizing selection is still a paradox in evolutionary biology. In moths, females emit a species-specific sex pheromone, consisting of a blend of biochemically related components, to which males are attracted. Although males appear to exert strong stabilizing selection on female pheromone, these blends seem to have evolved rapidly, as evidenced by ~120,000 moth species. Here we propose and test a “proximity model” wherein two females that vary in their relative attractiveness to males, can both benefit from calling in close proximity to each other. In a field study, we show that (1) artificially selected unattractive females can achieve mating rates comparable to attractive females if they signal in close proximity to attractive females, and (2) attractive females benefit from higher mating rates when signalling in close proximity to unattractive females. We propose that frequency-dependent behavioural and spatial interactions can sustain signal variation within populations even when these signals are under stabilizing selection.
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