Matters of Scale: Positive Allometry and the Evolution of Male Dimorphisms
Matters of Scale: Positive Allometry and the Evolution of Male Dimorphisms
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尺度问题：正异速生长和雄性二态性的进化
DOI：
10.1086/427732
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
N. Lebas
中科院分区：
文献类型：
--
作者：
J. L. Tomkins;J. Kotiaho;N. Lebas
可选择表型的发育独立性是表型可塑性和多样性起源的进化理论的关键。与替代性生殖策略相关的雄性二态性被广泛引用为适合度最优分化的兼性表达的例子。目前的雄性二态进化模型调用了一个大小依赖的阈值，在这个阈值上，表型被重新编程。我们使用异速生长模型的预测结果来检验两种甲虫（Onthophagus taurus和Onthophagus binodis）和欧洲土蜈蚣Forficula auricularia)是否存在重编程阈值。我们还比较了一些形态特征的异速生长，以确定未成年雄性是否抑制其第二性征。角异速生长的截距被抑制，但没有证据表明两种甲虫的角生长发生了重编程。蠼螋被重新编程了。在甲虫中，所有雄性的角长度都可以在很大程度上用指数角生长来解释，指数角生长遵循一个非常陡峭的幂函数。金牛的渐近线可以用满足资源枯竭约束的指数增长来解释。这些发现质疑了目前持有的观点，即甲虫角二态性显示了多样性进化中发育独立性的重要性。
The developmental independence of alternative phenotypes is key to evolutionary theories of phenotypic plasticity and the origins of diversity. Male dimorphisms associated with alternative reproductive tactics are widely cited examples of such facultative expression of divergent fitness optima. Current models for the evolution of male dimorphisms invoke a size‐dependent threshold at which the phenotype is reprogrammed. We use predictions derived from allometric modeling to test for the existence of reprogramming thresholds in two species of beetle, Onthophagus taurus and Onthophagus binodis, and the European earwig Forficula auricularia. We also compare the allometry of a number of morphological traits to determine whether minor males suppress their secondary sexual traits. The intercept of the horn allometry was suppressed, but there was no evidence of reprogramming of horn growth in either beetle species. There was reprogramming in the earwig. In the beetles, the horn length in all males can be explained largely in terms of exponential horn growth following an extraordinarily steep power function. The asymptote in O. taurus can be explained by exponential growth meeting the constraint of resource exhaustion. These findings question the currently held view that beetle horn dimorphisms showcase the importance of developmental independence in the evolution of diversity.
生物学缩放的方法论方面。
影响因子：
2
作者：
Prothero,J
通讯作者：
Prothero,J