期刊
ECOLOGY AND EVOLUTION
卷 7, 期 22, 页码 9503-9517出版社
WILEY
DOI: 10.1002/ece3.3457
关键词
Atherinomorus stipes; Caribbean; nd2
资金
- Wesleyan University: College of the Environment Schumann Funds
- College of the Environment Research Internship
- Department of Earth and Environmental Science Smith Funds
- Academic Affairs
Little is known about the natural history, biology, and population genetic structure of the Hardhead Silverside, Atherinomorus stipes, a small schooling fish found around islands throughout the Caribbean. Our field observations of A.stipes in the cays of Belize and the Florida Keys found that populations tend to be in close association with the shoreline in mangrove habitats. Due to this potential island-based population structuring, A.stipes represents an ideal system to examine questions about gene flow and isolation by distance at different geographic scales. For this study, the mitochondrial gene nd2 was amplified from 394 individuals collected from seven different Belizean Cays (N=175) and eight different Floridian Keys (N=219). Results show surprisingly high haplotype diversity both within and between island-groups, as well as a high prevalence of unique haplotypes within each island population. The results are consistent with models that require gene flow among populations as well as in situ evolution of rare haplotypes. There was no evidence for an isolation by distance model. The nd2 gene tree consists of two well-supported monophyletic groups: a Belizean-type clade and a Floridian-type clade, indicating potential species-level differentiation.
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