Dear list members,

The paper below is now available in Early View from Marine Mammal Science.

Martien, Karen K., Robin W. Baird, Nicole M. Hedrick, Antoinette M. Gorgone, Janet L. Thieleking, Daniel J. McSweeney, Kelly M. Robertson, Daniel L. Webster. 2011. Population structure of island-associated dolphins: evidence from mitochohndrial and microsatellite markers for common bottlenose dolphins (Tursiops truncatus) around the main Hawaiian Islands.  Marine Mammal Science. DOI: 10.111/j.1748-7692.2011.00506.x

We used mitochondrial and nuclear genetic markers to investigate population structure of common bottlenose dolphins, Tursiops truncatus, around the main Hawai- ian Islands. Though broadly distributed throughout the world’s oceans, bottlenose dolphins are known to form small populations in coastal waters. Recent photo- identification data suggest the same is true in Hawaiian waters. We found genetic differentiation among (mtDNA �ST = 0.014–0.141, microsatellite F’ST = 0.019– 0.050) and low dispersal rates between (0.17–5.77 dispersers per generation) the main Hawaiian Island groups. Our results are consistent with movement rates estimated from photo-identification data and suggest that each island group supports a demographically independent population. Inclusion in our analyses of samples collected near Palmyra Atoll provided evidence that the Hawaiian Islands are also occasionally visited by members of a genetically distinct, pelagic population. Two of our samples exhibited evidence of partial ancestry from Indo-Pacific bottlenose dolphins (T. aduncus), a species not known to inhabit the Hawaiian Archipelago. Our findings have important implications for the management of Hawaiian bottlenose dolphins and raise concerns about the vulnerability to human impacts of pelagic species in island ecosystems.

The paper is available at the following website:
http://onlinelibrary.wiley.com/doi/10.1111/j.1748-7692.2011.00506.x/abstract

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Karen K. Marten
Southwest Fisheries Science Center
8604 La Jolla Shores Drive
La Jolla, CA 92037
Tel: 858-546-7058
Fax: 858-546-7003
Karen.Martien@noaa.gov