Evolution of axial patterning in elongate fishes

Evolution of axial patterning in elongate fishes
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细长鱼类轴向图案的演变

DOI:
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发表时间:
2007
期刊:
影响因子:
--
通讯作者:
E. Brainerd
E. Brainerd
中科院分区:
--
文献类型:
--
作者:
A. B. Ward;E. Brainerd

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在鳍状鱼类中,鳗鱼状(极其细长)的身体形式从较深的身体形式进化了多次。先前的研究表明,脊柱的伸长可能与椎体数量的增加、椎体中心长度的增加或两者的结合有关。因为鱼类的脊柱至少有两个解剖学上不同的区域(即腹部和尾部),椎骨数量和相对长度的增加可能是特定区域的,也可能是整个脊柱长度的整体增加。在本研究中,我们记录了来自7组放光鳍鱼的54种博物馆标本的椎体计数和椎体宽高比(椎体长/宽)的测量。我们还从已发表的文献中收集了来自14目放光鳍鱼和板鳃鱼的813种的脊椎计数。我们发现椎骨的数量可以在脊柱的腹部和尾部区域独立增加,但长径比的变化在这两个区域发生相似。这些结果表明,腹椎体数、尾椎体数和椎体长径比受不同发育模块控制。基于这些发现,我们提出了一些可能有助于鱼类脊柱模式的候选发育机制。我们的研究是成人比较解剖学研究如何产生发育机制进化变化的可测试假设的一个例子。©2007 The Linnean Society of London, Biological Journal of Linnean Society, 2007, 90, 97‐116。
Within the ray-finned fishes, eel-like (extremely elongate) body forms have evolved multiple times from deeper-bodied forms. Previous studies have shown that elongation of the vertebral column may be associated with an increase in the number of vertebrae, an increase in the length of the vertebral centra, or a combination of both. Because the vertebral column of fishes has at least two anatomically distinct regions (i.e. abdominal and caudal), an increase in the number and relative length of the vertebrae could be region-specific or occur globally across the length of the vertebral column. In the present study, we recorded vertebral counts and measurements of vertebral aspect ratio (vertebral length/width) from museum specimens for 54 species representing seven groups of actinopterygian fishes. We also collected, from published literature, vertebral counts for 813 species from 14 orders of actinopterygian and elasmobranch fishes. We found that the number of vertebrae can increase independently in the abdominal and caudal regions of the vertebral column, but changes in aspect ratio occur similarly in both regions. These findings suggest that abdominal vertebral number, caudal vertebral number, and vertebral aspect ratio are controlled by separate developmental modules. Based on these findings, we suggest some candidate developmental mechanisms that may contribute to vertebral column patterning in fishes. Our study is an example of how comparative anatomical studies of adults can generate testable hypotheses of evolutionary changes in developmental mechanisms. © 2007 The Linnean Society of London, Biological Journal of the Linnean Society , 2007, 90 , 97‐116.
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