Early diversification of avian limb morphology and the role of modularity in the locomotor evolution of crown birds
Early diversification of avian limb morphology and the role of modularity in the locomotor evolution of crown birds
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DOI：
10.1093/evolut/qpac039
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发表时间：
2023-02-04
期刊：
影响因子：
3.3
通讯作者：
Clarke, Julia A.
中科院分区：
文献类型：
--
作者：
Eliason, Chad M.;Proffitt, James, V;Clarke, Julia A.
冠鸟的前肢和后肢节之间的高度差异相对于非鸟类的兽脚类恐龙，可能是由独立的前肢和后肢运动模块的起源驱动的，已被链接到不同的鸟类运动行为的进化。然而，这种假设的关系很少在系统发育框架中进行定量研究。我们通过比较来自1,241个现存物种数据集的运动差异与形态空间大小的数值代理，评估了肢体形态进化与运动行为之间的关系。然后，我们估计如何四肢差距积累冠禽辐射。最后，我们测试了肢体节段是否独立进化的每个肢体模块之间使用遗传学的信息回归。后肢差异增加后，占分支年龄和物种丰富度的运动差异显着。我们发现，前肢差距迅速积累鸟类进化的早期，而后肢差距积累较晚，在最近的分歧。我们发现前肢和后肢形态之间的强相关性的支持很少。我们认为，这些发现支持独立的运动模块，使现存鸟类的惊人的形态和行为差异的进化。
High disparity among avian forelimb and hind limb segments in crown birds relative to non-avialan theropod dinosaurs, potentially driven by the origin of separate forelimb and hind limb locomotor modules, has been linked to the evolution of diverse avian locomotor behaviors. However, this hypothesized relationship has rarely been quantitatively investigated in a phylogenetic framework. We assessed the relationship between the evolution of limb morphology and locomotor behavior by comparing a numerical proxy for locomotor disparity to morphospace sizes derived from a dataset of 1,241 extant species. We then estimated how limb disparity accumulated during the crown avian radiation. Lastly, we tested whether limb segments evolved independently between each limb module using phylogenetically informed regressions. Hind limb disparity increased significantly with locomotor disparity after accounting for clade age and species richness. We found that forelimb disparity accumulated rapidly early in avian evolution, whereas hind limb disparity accumulated later, in more recent divergences. We recovered little support for strong correlations between forelimb and hind limb morphology. We posit that these findings support independent evolution of locomotor modules that enabled the striking morphological and behavioral disparity of extant birds.