A Paradox of Genetic Variance in Epigamic Traits: Beyond “Good Genes” View of Sexual Selection

A Paradox of Genetic Variance in Epigamic Traits: Beyond “Good Genes” View of Sexual Selection
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表观性状遗传变异的悖论:超越“良好基因”的性选择观点

DOI:
10.1007/s11692-015-9359-y
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发表时间:
2016
影响因子:
2.5
通讯作者:
Reinhold K
Reinhold K
中科院分区:
生物学2区
文献类型:
--
作者:
Radwan J;Engqvist L;Reinhold K

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保持第二性征的遗传变异,包括奇怪的装饰品和精心制作的求偶展示,是性别选择理论的中心问题。尽管理论上认为强烈的性选择会导致加性遗传方差的减少,但与交配成功相关的性状显示出相对较高的遗传力。在这里,我们认为,由于代价高昂的表观特征的产生相关的权衡,性别选择可能会导致这些特征中的遗传变异的增加,而不是减少。这种权衡也有望有助于维持与生态相关的特征的遗传变异,对进化过程具有重要影响,例如适应新环境或生态物种形成。然而,如果权衡是性别特征遗传变异的一个重要来源,那么遗传变异的大小可能与配偶选择的可能遗传利益几乎没有相关性。
Maintenance of genetic variance in secondary sexual traits, including bizarre ornaments and elaborated courtship displays, is a central problem of sexual selection theory. Despite theoretical arguments predicting that strong sexual selection leads to a depletion of additive genetic variance, traits associated with mating success show relatively high heritability. Here we argue that because of trade-offs associated with the production of costly epigamic traits, sexual selection is likely to lead to an increase, rather than a depletion, of genetic variance in those traits. Such trade-offs can also be expected to contribute to the maintenance of genetic variation in ecologically relevant traits with important implications for evolutionary processes, e.g. adaptation to novel environments or ecological speciation. However, if trade-offs are an important source of genetic variation in sexual traits, the magnitude of genetic variation may have little relevance for the possible genetic benefits of mate choice.
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