Mortality costs of sexual dimorphism in birds
Mortality costs of sexual dimorphism in birds
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鸟类性二态性的死亡率
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
T. E. Martin
中科院分区：
文献类型：
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作者：
D. Promislow;R. Montgomerie;T. E. Martin
性选择的特征为携带者提供了交配优势，但它们也应该通过自然选择付出代价。虽然这些特征带来的交配好处已经有了很好的记录，但成本却很难证明。在28个北美雀形目鸟类的死亡率模式的分析中，我们发现，性别偏见的死亡率（log 10男性死亡率-log 10女性死亡率）与性别大小二型性和男性羽毛亮度呈正相关。男性（而不是女性）的死亡率与性别大小二型性呈正相关，这表明男性的成本，男性竞争。女性（而不是男性）死亡率与男性亮度呈负相关，我们认为，从这一点，男性亮度的演变受到死亡成本的限制。因此，在鸟类物种内的身体大小和羽毛颜色的两性异形似乎受到性选择的相反力量的影响，作用是增加两性异形和成年死亡率，这限制了这些特征的进化。不同物种之间装饰特征的差异不仅可以解释为装饰物带来的交配利益的变化，正如人们经常假设的那样，而且还可以解释为这些特征的成本的变化。
Sexually selected traits provide a mating advantage to the bearer but they should also exact a cost through natural selection. Whereas the mating benefits from such traits have been well documented, the costs have been difficult to demonstrate. In this analysis of mortality patterns across 28 North American passerine bird species, we show that sex-biased mortality (log10 male mortality – log10 female mortality) is positively correlated with both sexual size dimorphism and male plumage brightness. Male (but not female) mortality is positively correlated with sexual size dimorphism, suggesting a cost to male–male competition. Female (but not male) mortality is negatively correlated with male brightness, and we argue from this that the evolution of male brightness has been constrained by mortality costs. Thus sexual dimorphism in body size and plumage colour within bird species appears to be influenced by the opposing forces of sexual selection, acting to increase dimorphism, and adult mortality rates, which constrain the evolution of these traits. Differences in the expression of ornamental traits across species may be explained not only by variation in the mating benefits that accrue from ornaments, as is so often assumed, but also by variation in the costs of these traits.
父母照顾的演变
DOI：
10.1093/acprof:oso/9780199692576.003.0016
发表时间：
2012
期刊：
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影响因子：
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作者：
Kölliker M
通讯作者：
Kölliker M