期刊
JOURNAL OF HEREDITY
卷 104, 期 6, 页码 765-778出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/jhered/est070
关键词
Indian River Lagoon; microsatellite; mtDNA; Tursiops truncatus
资金
- State of Florida's Protect Wild Dolphins Specialty License Plate Fund
- NOAA/Center for Coastal Environmental Health and Biomolecular Research (CCEHBR)
- NOAA/NMFS Marine Mammal Health and Stranding Response Program
- Intramural Research Program of the National Institutes of Health, National Cancer Institute
Globally distributed, the bottlenose dolphin (Tursiops truncatus) is found in a range of offshore and coastal habitats. Using 15 microsatellite loci and mtDNA control region sequences, we investigated patterns of genetic differentiation among putative populations along the eastern US shoreline (the Indian River Lagoon, Florida, and Charleston Harbor, South Carolina) (microsatellite analyses: n = 125, mtDNA analyses: n = 132). We further utilized the mtDNA to compare these populations with those from the Northwest Atlantic, Gulf of Mexico, and Caribbean. Results showed strong differentiation among inshore, alongshore, and offshore habitats (Phi(ST) = 0.744). In addition, Bayesian clustering analyses revealed the presence of 2 genetic clusters (populations) within the 250 km Indian River Lagoon. Habitat heterogeneity is likely an important force diversifying bottlenose dolphin populations through its influence on social behavior and foraging strategy. We propose that the spatial pattern of genetic variation within the lagoon reflects both its steep longitudinal transition of climate and also its historical discontinuity and recent connection as part of Intracoastal Waterway development. These findings have important management implications as they emphasize the role of habitat and the consequence of its modification in shaping bottlenose dolphin population structure and highlight the possibility of multiple management units existing in discrete inshore habitats along the entire eastern US shoreline.
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