Sexual selection and allometry: A critical reappraisal of the evidence and ideas
Sexual selection and allometry: A critical reappraisal of the evidence and ideas
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DOI：
10.1111/j.1558-5646.2007.00081.x
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发表时间：
2007-04-01
期刊：
影响因子：
3.3
通讯作者：
Bonduriansky, Russell
中科院分区：
文献类型：
--
作者：
Bonduriansky, Russell
性选择文献中最普遍的观点之一是认为，性选择的特征几乎普遍表现出正的静态异速生长(即，在同种成年人的样本中，体型较大的个体具有不成比例的较大特征)。在这篇综述中，我表明这一观点与经验证据和理论相矛盾。虽然正向异速生长是某些群体中某些性特征的典型特征，但经验文献中的正向异速生长性征的优势显然源于抽样偏向，反映了对异常夸张(奇怪)特征的迷恋。我回顾了来自广泛分类群的经验例子，说明了信号、武器、抱合和生殖器特征以及非性特征所表现出的异速生长模式的多样性。这一证据表明，正向异速生长可能是性特征中的例外而不是规则，方向性选择不一定导致正向异速生长的进化，相反，正向异速生长不一定是性选择的结果，许多性特征在异速生长截距而不是斜率上表现出性别差异。第二性特征异速生长的多样性是可以预期的，因为最佳异速生长应该反映资源分配的权衡，以及在性状大小和身体大小上的性选择和生存能力选择的模式。对性选择和异速生长之间的关系进行不偏不倚的经验性评估是理解这种多样性的关键一步。
One of the most pervasive ideas in the sexual selection literature is the belief that sexually selected traits almost universally exhibit positive static allometries (i.e., within a sample of conspecific adults, larger individuals have disproportionally larger traits). In this review, I show that this idea is contradicted by empirical evidence and theory. Although positive allometry is a typical attribute of some sexual traits in certain groups, the preponderance of positively allometric sexual traits in the empirical literature apparently results from a sampling bias reflecting a fascination with unusually exaggerated (bizarre) traits. I review empirical examples from a broad range of taxa illustrating the diversity of allometric patterns exhibited by signal, weapon, clasping and genital traits, as well as nonsexual traits. This evidence suggests that positive allometry may be the exception rather than the rule in sexual traits, that directional sexual selection does not necessarily lead to the evolution of positive allometry and, conversely, that positive allometry is not necessarily a consequence of sexual selection, and that many sexual traits exhibit sex differences in allometric intercept rather than slope. Such diversity in the allometries of secondary sexual traits is to be expected, given that optimal allometry should reflect resource allocation trade-offs, and patterns of sexual and viability selection on both trait size and body size. An unbiased empirical assessment of the relation between sexual selection and allometry is an essential step towards an understanding of this diversity.