Selection,Morphological Integration,and Strepsirrhine Locomotor Adaptations |
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Authors: | Brian Villmoare Jennifer Fish William Jungers |
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Institution: | (1) Department of Anthropology, University College London, London, UK;(2) Department of Craniofacial Development, King’s College London, London, UK;(3) Department of Anatomical Sciences, State University of New York, Stonybrook, NY, USA |
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Abstract: | Clades with taxa that have multiple locomotor adaptations represent a direct way to test the relationship between adaptation
and integration. If integration is influenced by functional requirements, integration should be most apparent where selection
is strongest and less evident where selection has been relaxed. If integration is primarily regulated by genetic constraints,
integration should be present irrespective of selection pressures. Here we use patterns of integration in the strepsirrhine
fore- and hind limbs as a test case. Strepsirrhine locomotion is relatively well-studied, and there are multiple clades that
share different locomotor modes. We found that quadrupeds have greater limb integration than vertical leapers. These results
suggest that variation can be expressed if selection for integration is relaxed. However, an unexpected pattern was revealed,
in which there appears to be some broader regulatory mechanism controlling overall limb integration. Our tests identified
a strong correlation between integration of the forelimb and integration of the hind limb. This broader mechanism may be evidence
of the primitive genetic control of limb integration. |
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Keywords: | |
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