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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Vitt, L. J. Titus, T. A. Zani, P. A. Caldwell, J. P. |
| Description | Author Affiliation: Vitt LJ ( Oklahoma Museum of Natural History and Zoology Department, University of Oklahoma, Norman 73019, USA.); |
| Abstract | We compared morphology of two geographically close populations of the tropical lizard Tropidurus hispidus to test the hypothesis that habitat structure influences the evolution of morphology and ecology at the population level. T. hispidus isolated on a rock outcrop surrounded by tropical forest use rock crevices for refuge and appear dorsoventrally compressed compared with those in open savanna. A principal components analysis revealed that the populations were differentially distributed along an axis representing primarily three components of shape: body width, body height, and hind-leg length. Morphological divergence was supported by a principal components analysis of size-free morphological variables. Mitochondrial DNA sequences of ATPase 6 indicate that these populations are closely related relative to other T. hispidus, the rock outcrop morphology and ecology are derived within T. hispidus, and morphological and ecological divergence has occurred more rapidly than genetic divergence. This suggests that natural selection can rapidly adjust morphology and ecology in response to a recent history of exposure to habitats differing in structure, a result heretofore implied from comparative studies among lizard species. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 8 |
| Volume Number | 94 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1997-05-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Biological Evolution Lizards Genetics Animals DNA, Mitochondrial Molecular Sequence Data Sequence Alignment Sequence Analysis, DNA Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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