Accession Number : ADA549516


Title :   Population Structure of Island-Associated Dolphins: Evidence from Photo-Identification of Common Bottlenose Dolphins (Tursiops truncatus) in the Main Hawaiian Islands


Descriptive Note : Journal article


Corporate Author : CASCADIA RESEARCH COLLECTIVE OLYMPIA WA


Personal Author(s) : Baird, Robin W ; Gorgone, Antoinette M ; McSweeney, Daniel J ; Ligon, Allan D ; Deakos, Mark H ; Webster, Daniel L ; Schorr, Gregory S ; Martien, Karen K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a549516.pdf


Report Date : Apr 2009


Pagination or Media Count : 25


Abstract : Management agencies often use geopolitical boundaries as proxies for biological boundaries. In Hawaiian waters a single stock is recognized of common bottlenose dolphins, Tursiops truncatus, a species that is found both in open water and nearshore among the main Hawaiian Islands. To assess population structure, we photo-identified 336 distinctive individuals from the main Hawaiian Islands, from 2000 to 2006. Their generally shallow-water distribution, and numerous within-year and between-year resightings within island areas suggest that individuals are resident to the islands, rather than part of an offshore population moving through the area. Comparisons of identifications obtained from Kaua'i/Ni'ihau, O'ahu, the 4- island area, and the island of Hawai'i showed no evidence of movements among these island groups, although movements from Kaua'i to Ni'ihau and among the 4-islands were documented. A Bayesian analysis examining the probability of missing movements among island groups, given our sample sizes for different areas, indicates that interisland movement rates are less than 1% per year with 95% probability. Our results suggest the existence of multiple demographically independent populations of island-associated common bottlenose dolphins around the main Hawaiian islands.


Descriptors :   *DOLPHINS(MAMMALS) , *HAWAII , GEOPOLITICS , INSHORE AREAS , ISLANDS , MANAGEMENT , MOTION , POPULATION , PROBABILITY , REPRINTS


Subject Categories : Biology


Distribution Statement : APPROVED FOR PUBLIC RELEASE