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Mutual Mate Choice Can Drive Costly Signaling Even Under Perfect Monogamy

机译:即使在完美的一夫一妻制下,互助伴侣的选择也可能导致昂贵的信号传递

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摘要

Models of sexual selection by mate choice have emphasized the evolution of sexually dimorphic costly signals, such as elaborate plumage or courtship display, in the sex exhibiting higher reproductive skew, usually males. Less well explored is the action of mutual mate choice in driving signal evolution in socially monogamous or near-monogamous populations. We present a simulation model of condition-dependent investment in a signal trait under conditions of perfect monogamy, equal initial offspring number, and differential offspring mortality based on inherited genetic quality minus signal cost. The model demonstrates persistent evolution of high-cost sexual ornaments through mutual mate choice, even under strict monogamy, as long as the phenotypic condition is sufficiently heritable, and the monomorphic ornament reflects condition with sufficient accuracy to allow positive assortative mating. We discuss implications for research on sexual selection, mate choice, mutation-selection balance, and human evolution.
机译:通过配偶选择进行性选择的模型已强调,在表现出较高生殖偏斜的性别(通常为男性)中,性双态性代价高昂的信号(例如精心制作的羽毛或求爱显示)的演变。在社会一夫一妻制或近一夫一妻制人群中,选择伴侣对驱动信号进化的作用还没有得到很好的研究。我们提出了一个完美的一夫一妻制,相等的初始后代数和基于遗传遗传质量减去信号成本的后代死亡率差异的条件下,对信号性状进行条件依赖投资的模拟模型。该模型表明,即使在严格的一夫一妻制下,只要表型条件具有足够的遗传力,高价的性装饰物就可以通过相互择偶而持续进化,并且单态装饰物能够以足够的精度反映条件,以允许积极的配偶交配。我们讨论了对性选择,伴侣选择,突变选择平衡和人类进化的研究意义。

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