Can diet niche partitioning enhance sexual dimorphism?
Can diet niche partitioning enhance sexual dimorphism?
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DOI：
10.1002/ece3.9599
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发表时间：
2022-12
影响因子：
2.6
通讯作者：
中科院分区：
文献类型：
--
作者：
经典的进化理论认为，两性异形主要是通过性选择和生殖力选择而进化的。然而，越来越多的理论和证据表明，资源竞争可以通过两性之间的生态特征置换来推动两性异形的进化。这一假说的一个关键预测是，两性之间的生态分歧程度将与两性二型性的程度有关。由于动物组织的稳定同位素比率提供了生态学各个方面的定量测量，我们进行了一项荟萃分析，检查性别之间同位素差异程度与体型二态性程度之间的关联。我们的模型表明，性别之间同位素（生态学）差异的大量研究间变化是非随机的，可能与研究对象的特征有关。因此，我们完成了元回归，以检查性别之间的同位素差异程度是否与性别大小二态性的程度相关。我们发现，适度，但显着的正相关性之间的大小二型性和性别之间的生态差异的物种，增加的强度时，性别之间的饮食分歧的生态机会是最大的。因此，我们的研究结果提供了进一步的证据表明，生态介导的选择，不直接与生殖，可以有助于性二型性的进化。理论和实证研究表明，两性之间对资源的竞争在两性异形的进化中起着重要作用。我们通过分析性二态性程度与组织稳定同位素值的性别差异之间的跨物种关系来研究这一概念，这是饮食差异的代表。我们发现，性二态性与营养水平的性别差异有关，如果资源竞争参与性二态性的进化，则与预期的方向和背景一致。
Classic evolutionary theory suggests that sexual dimorphism evolves primarily via sexual and fecundity selection. However, theory and evidence are beginning to accumulate suggesting that resource competition can drive the evolution of sexual dimorphism, via ecological character displacement between sexes. A key prediction of this hypothesis is that the extent of ecological divergence between sexes will be associated with the extent of sexual dimorphism. As the stable isotope ratios of animal tissues provide a quantitative measure of various aspects of ecology, we carried out a meta‐analysis examining associations between the extent of isotopic divergence between sexes and the extent of body size dimorphism. Our models demonstrate that large amounts of between‐study variation in isotopic (ecological) divergence between sexes is nonrandom and may be associated with the traits of study subjects. We, therefore, completed meta‐regressions to examine whether the extent of isotopic divergence between sexes is associated with the extent of sexual size dimorphism. We found modest but significantly positive associations across species between size dimorphism and ecological differences between sexes, that increased in strength when the ecological opportunity for dietary divergence between sexes was greatest. Our results, therefore, provide further evidence that ecologically mediated selection, not directly related to reproduction, can contribute to the evolution of sexual dimorphism. Theoretical and empirical work suggests that between‐sex competition for resources plays a role in the evolution of sexual dimorphism. We investigated this concept by analyzing cross‐species relationships between the extent of sexual dimorphism and published sex differences in tissue stable isotope values, which are a proxy of dietary differences. We found that sexual dimorphism is related to sex differences in trophic level, in directions and contexts consistent with those expected if resource competition is involved in the evolution of sexual dimorphism.
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影响因子：
2.8
作者：
Codron, D;Lee-Thorp, JA;Codron, J
通讯作者：
Codron, J
影响因子：
5.2
作者：
Bauder, Javan M.;Breininger, David R.;McGarigal, Kevin
通讯作者：
McGarigal, Kevin
影响因子：
2.3
作者：
Arnold, Todd W.
通讯作者：
Arnold, Todd W.
影响因子：
3.1
作者：
Boyce, MS;Vernier, PR;Schmiegelow, FKA
通讯作者：
Schmiegelow, FKA
影响因子：
2.3
作者：
Coluccy, John M.;Yerkes, Tina;Davis, Jonas
通讯作者：
Davis, Jonas