Evolution of axial patterning in elongate fishes
Identifieur interne : 000788 ( Main/Exploration ); précédent : 000787; suivant : 000789Evolution of axial patterning in elongate fishes
Auteurs : Andrea B. Ward [États-Unis] ; Elizabeth L. Brainerd [États-Unis]Source :
- Biological Journal of the Linnean Society [ 0024-4066 ] ; 2007-01.
English descriptors
- KwdEn :
Abstract
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.
Url:
DOI: 10.1111/j.1095-8312.2007.00714.x
Affiliations:
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Ward</name><affiliation wicri:level="4"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Biology Department and Organismic and Evolutionary Biology Program, University of Massachusetts, Amherst MA 01003</wicri:regionArea><orgName type="university">Université du Massachusetts</orgName><placeName><settlement type="city">Amherst (Massachusetts)</settlement><region type="state">Massachusetts</region></placeName></affiliation></author><author><name sortKey="Brainerd, Elizabeth L" sort="Brainerd, Elizabeth L" uniqKey="Brainerd E" first="Elizabeth L." last="Brainerd">Elizabeth L. 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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.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Massachusetts</li></region><settlement><li>Amherst (Massachusetts)</li></settlement><orgName><li>Université du Massachusetts</li></orgName></list><tree><country name="États-Unis"><region name="Massachusetts"><name sortKey="Ward, Andrea B" sort="Ward, Andrea B" uniqKey="Ward A" first="Andrea B." last="Ward">Andrea B. Ward</name></region><name sortKey="Brainerd, Elizabeth L" sort="Brainerd, Elizabeth L" uniqKey="Brainerd E" first="Elizabeth L." last="Brainerd">Elizabeth L. Brainerd</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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