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Assessment of the overlap of Terrebonne-Timbalier Bay and Bartaria Bay common bottlenose dolphin (Tursiops truncatus) stocks based on photo-identification of individual dolphins
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2018
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[PDF-3.01 MB]
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Description:Common bottlenose dolphins (Tursiops truncatus) are distributed throughout the U.S. Gulf of Mexico (GoMx) from upper continental slope waters, across the continental shelf, to coastal waters, and throughout the numerous adjacent bays, sounds and estuaries (BSEs) (Vollmer and Rosel 2013). The National Marine Fisheries Service (NMFS) is responsible for assessing and managing cetaceans in U.S. waters. Each cetacean species is divided into one or more stocks and the stock is the unit of protection under the Marine Mammal Protection Act (MMPA). A stock is defined in the MMPA as a group of the same species in a common spatial arrangement that interbreed when mature (MMPA 1972). A more functional definition of a population stock is a group of animals whose dynamics are more a consequence of internal dynamics (births and deaths) within the group than external dynamics (immigration or emigration) (Taylor 2005). There are currently 31 BSE stocks of common bottlenose dolphins managed in the U.S. GoMx (Hayes et al. 2017). These BSE stocks are largely defined based on discrete geographic areas with few waterways connecting them to similar adjacent areas, which might limit dolphin movement between them.
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Rights Information:Public Domain
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Compliance:Submitted
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