Developmental processes underlying the evolution of a derived foot morphology in salamanders
Developmental processes underlying the evolution of a derived foot morphology in salamanders
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DOI：
10.1073/pnas.0710216105
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发表时间：
2007-12-18
影响因子：
11.1
通讯作者：
Wake, David B.
中科院分区：
文献类型：
--
作者：
Jaekel, Martin;Wake, David B.
指间带在热带蝾螈（bolitoglossines）中反复进化。这种衍生的足的形态只是这种多样的两栖动物分支中许多同源特征之一。事实上，很少有任何形态特征分类谱系内这支。我们调查的过程中，这些蝾螈的形态特征的同源性进化的选择性和发展过程中产生的趾间织带进行分析。我们发现，pedomorphic的发展变化产生新的脚的形态和pedomorphosis影响了一些形态特征，从而创造了它们之间的发展相关性。这种性状间的相关性在大多数物种中都保持着，从而促进了性状的重复进化。虽然我们发现证据表明，在一个物种的脚形态的变化是适应性的，在所有其他物种的织带的进化并不携带一个适应性的签名。因此，新的足的形态会反复进化，即使在明显缺乏直接选择优势的情况下也是如此。
Interdigital webbing has evolved repeatedly in tropical salamanders (bolitoglossines). This derived foot morphology is only one of many homoplastic traits in this diverse amphibian clade. Indeed, few if any morphological traits sort lineages within this clade. We investigate the processes underlying the homoplastic evolution of morphological characters in these salamanders by analyzing selective and developmental processes that generate interdigital webbing. We show that a pedomorphic developmental change generates the new foot morphology and that pedomorphosis affects a number of morphological traits, thus creating a developmental correlation among them. This correlation among traits is maintained across most species, thus facilitating the repeated evolution of traits. Although we find evidence that the changes in foot morphology are adaptive in one species, the evolution of webbing in all other species does not carry an adaptive signature. The new foot morphology therefore evolves repeatedly, even in the apparent absence of a direct selective advantage.