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Different Evolutionary Pathways Lead to Incomplete Convergence of Elongate Body Shapes in Carnivoran Mammals
Systematic Biology ( IF 6.1 ) Pub Date : 2021-11-10 , DOI: 10.1093/sysbio/syab091
Chris J Law 1, 2, 3
Affiliation  

Although convergence is often recognized as a ubiquitous feature across the Tree of Life, whether the underlying traits also exhibit similar evolutionary pathways towards convergent forms puzzles biologists. In carnivoran mammals, “elongate,” “slender,” and “long” are often used to describe and even to categorize mustelids (martens, polecats, and weasels), herpestids (mongooses), viverrids (civets and genets), and other carnivorans together. But just how similar these carnivorans are and whether there is convergence in the morphological component that contribute to elongation has never been assessed. Here, I found that these qualitatively described elongate carnivorans exhibited incomplete convergence towards elongate bodies compared to other terrestrial carnivorans. In contrast, the morphological components underlying body shape variation do not exhibit convergence despite evidence that these components are more elongate in elongate carnivorans compared to nonelongate carnivorans. Furthermore, these components also exhibited shorter but different phylogenetic half-lives towards more elongate adaptive peaks, indicating that different selective pressures can create multiple pathways to elongation. Incorporating the fossil record will facilitate further investigation of whether body elongation evolved adaptively or if it is simply a retained ancestral trait.[Axial skeleton; body elongation; convergent evolution; macroevolution; phylogenetic comparative methods; thoracolumbar vertebrae.]

中文翻译:

不同的进化途径导致食肉哺乳动物细长体形的不完全收敛

尽管趋同通常被认为是生命之树中普遍存在的特征,但潜在的特征是否也表现出类似的趋同形式的进化途径,这让生物学家感到困惑。在食肉哺乳动物中,“细长”、“细长”和“长”通常用于描述甚至分类鼬科动物(貂、鸡貂和黄鼠狼)、疱疹科动物(猫鼬)、viverrids(果子狸和基因)和其他食肉动物一起。但是,这些食肉动物的相似程度以及有助于伸长的形态成分是否存在收敛性从未被评估过。在这里,我发现这些定性描述的细长食肉动物与其他陆地食肉动物相比,对细长体表现出不完全收敛。相比之下,尽管有证据表明这些成分在细长食肉动物中比非细长食肉动物更细长,但体形变化背后的形态成分并未表现出收敛性。此外,这些组分还表现出更短但不同的系统发育半衰期,朝向更延长的适应性峰,表明不同的选择压力可以产生多种延长途径。结合化石记录将有助于进一步研究身体伸长是适应性进化还是仅仅是保留的祖先特征。车身伸长率;趋同进化;宏观进化;系统发育比较方法;胸腰椎。] 此外,这些组分还表现出更短但不同的系统发育半衰期,朝向更延长的适应性峰,表明不同的选择压力可以产生多种延长途径。结合化石记录将有助于进一步研究身体伸长是适应性进化还是仅仅是保留的祖先特征。车身伸长率;趋同进化;宏观进化;系统发育比较方法;胸腰椎。] 此外,这些组分还表现出更短但不同的系统发育半衰期,朝向更延长的适应性峰,表明不同的选择压力可以产生多种延长途径。结合化石记录将有助于进一步研究身体伸长是适应性进化还是仅仅是保留的祖先特征。车身伸长率;趋同进化;宏观进化;系统发育比较方法;胸腰椎。] 结合化石记录将有助于进一步研究身体伸长是适应性进化还是仅仅是保留的祖先特征。车身伸长率;趋同进化;宏观进化;系统发育比较方法;胸腰椎。] 结合化石记录将有助于进一步研究身体伸长是适应性进化还是仅仅是保留的祖先特征。车身伸长率;趋同进化;宏观进化;系统发育比较方法;胸腰椎。]
更新日期:2021-11-10
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