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Punctuated versus gradual shifts in the multivariate evolutionary process: a test with paired radiations of scincid lizards
Systematic Biology ( IF 6.1 ) Pub Date : 2025-01-16 , DOI: 10.1093/sysbio/syaf002
Natasha Stepanova, James D Boyko, Jada Lin, Alison R Davis Rabosky, Daniel L Rabosky

As lineages become separated in time, they are expected to accumulate mutational (or developmental-genetic) differences that influence the macroevolutionary trajectories of those lineages even under similar environmental conditions. Here, we compare the dynamics of phenotypic evolution in radiations of scincid lizards from Australia and Madagascar that are separated by more than 100 million years of independent evolution and show rampant phenotypic parallelism. We collected linear measurements of the skull, limbs, and limb girdles from micro-CT scans of 94 Australian and 29 Malagasy species. Using multivariate comparative methods, we tested whether the underlying evolutionary covariance structure for this superficial parallelism was conserved and whether these patterns were consistent across distinct functional modules. Malagasy and most Australian skinks have similar covariance matrices for skull evolution. Results are ambiguous for limbs and limb girdles, as some trait subsets support different evolutionary processes and for other subsets, a shared covariance matrix could not be rejected. However, across most trait sets, the extremely speciose Australian genus Ctenotus exhibits a radically different covariance structure from all other lizards in these groups, including several closely related genera. The shift in Ctenotus demonstrates that the architecture of trait correlations can change at relatively shallow timescales and may explain the unique position of this clade in morphospace relative to other scincid lizards from both geographic regions. More generally, our results demonstrate that the multivariate evolutionary process can change dramatically in a relatively short period of time.

中文翻译:


多变量进化过程中的间断与渐进变化:对 scincid 蜥蜴成对辐射的测试



随着谱系在时间上分离,预计它们会积累突变(或发育遗传)差异,即使在相似的环境条件下,这些差异也会影响这些谱系的宏观进化轨迹。在这里,我们比较了来自澳大利亚和马达加斯加的蜥蜴辐射中的表型进化动力学,这些蜥蜴被 1 亿多年的独立进化分开,并显示出猖獗的表型平行性。我们从 94 种澳大利亚物种和 29 种马达加斯加物种的显微 CT 扫描中收集了颅骨、肢体和肢带的线性测量值。使用多变量比较方法,我们测试了这种表面平行性的潜在进化协方差结构是否守恒,以及这些模式在不同的功能模块之间是否一致。马达加斯加石龙子和大多数澳大利亚石龙子具有相似的颅骨进化协方差矩阵。肢体和肢体带的结果是模棱两可的,因为一些性状子集支持不同的进化过程,而对于其他子集,不能拒绝共享的协方差矩阵。然而,在大多数性状集中,极其特殊的澳大利亚属 Ctenotus 表现出与这些组中所有其他蜥蜴截然不同的协方差结构,包括几个密切相关的属。Ctenotus 的转变表明,性状相关性的结构可以在相对较浅的时间尺度上发生变化,并可能解释该分支相对于来自两个地理区域的其他 scincid 蜥蜴在形态空间中的独特位置。更一般地说,我们的结果表明,多元进化过程可以在相对较短的时间内发生巨大变化。
更新日期:2025-01-16
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