Modification of vertebral regions explains heart position in arboreal colubrids (Serpentes: Colubridae)

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Tamika Nash-Hahn, Natasha Stepanova, Alison R Davis Rabosky, Emma Sherratt
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Abstract

Recent research into the snake vertebral column has highlighted the importance of considering regionalization and its implications for the life history of snakes. Our research delves into the distinctions in vertebral column morphology and regionalization within the snake family Colubridae, comparing arboreal and terrestrial species. Our results provide significant support for dissociation between two pre-cloacal regions: the ‘pre-atrial’ (anterior to heart) and the ‘post-atrial’ (posterior to heart). Furthermore, the two ecological groups display distinct proportional compositions between the two pre-cloacal regions and the one post-cloacal region (caudal); arboreal species tend to possess a higher proportion of caudal vertebrae, whereas terrestrial species exhibit a higher proportion of post-atrial vertebrae. Our study reveals that the axial morphology of arboreal species is distinct from that of terrestrial species; however, this was not attributable to a convergent evolution process. By estimating the evolutionary history of vertebral number in each region between the ecological groups, we find each region has a unique pattern, further highlighting evolutionary disassociation between the regions. This study adds to the growing evidence on regionalization of the pre-cloacal snake vertebral column and underscores the importance in continuing to develop our understanding of snake evolution.
脊椎区的改变解释了树栖疣鼻狗(蛇类:疣鼻狗科)的心脏位置
最近对蛇类脊椎柱的研究突出了考虑区域化及其对蛇类生活史影响的重要性。我们的研究通过比较树栖物种和陆栖物种,深入探讨了眼镜蛇科蛇类脊椎柱形态和区域化的区别。我们的研究结果有力地支持了两个前腔区域之间的分离:"前庭"(心脏前方)和 "后庭"(心脏后方)。此外,两个生态类群在两个前胸区和一个后胸区(尾椎)之间显示出不同的比例组成;树栖物种往往拥有较高比例的尾椎,而陆栖物种则表现出较高比例的后房椎。我们的研究揭示了树栖物种的轴向形态与陆栖物种的轴向形态不同,但这并不能归因于趋同进化过程。通过估算生态群之间每个区域脊椎数量的进化历史,我们发现每个区域都有独特的模式,进一步凸显了区域之间进化的不一致性。这项研究补充了越来越多关于前环蛇脊椎区域化的证据,并强调了继续发展我们对蛇类进化的理解的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.20
自引率
4.30%
发文量
567
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