Identification of distinct movement patterns in Pacific leatherback turtle populations influenced by ocean conditions
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Le résumé fourni par la source
Interactions with fisheries are believed to be a major cause of mortality for adult leatherback turtles (Dermochelys coriacea), which is of particular concern in the Pacific Ocean, where they have been rapidly declining. In order to identify where these interactions are occurring and how they may be reduced, it is essential first to understand the movements and behavior of leatherback turtles. There are two regional nesting populations in the East Pacific (EP) and West Pacific (WP), comprising multiple nesting sites. We synthesized tracking data from the two populations and compared their movement patterns. A switching state-space model was applied to 135 Argos satellite tracks to account for observation error, and to distinguish between migratory and area-restricted search behaviors. The tracking data, from the largest leatherback data set ever assembled, indicated that there was a high degree of spatial segregation between EP and WP leatherbacks. Area-restricted search behavior mainly occurred in the southeast Pacific for the EP leatherbacks, whereas the WP leatherbacks had several different search areas in the California Current, central North Pacific, South China Sea, off eastern Indonesia, and off southeastern Australia. We also extracted remotely sensed oceanographic data and applied a generalized linear mixed model to determine if leatherbacks exhibited different behavior in relation to environmental variables. For the WP population, the probability of area-restricted search behavior was positively correlated with chlorophyll-a concentration. This response was less strong in the EP population, but these turtles had a higher probability of search behavior where there was greater Ekman upwelling, which may increase the transport of nutrients and consequently prey availability. These divergent responses to oceanographic conditions have implications for leatherback vulnerability to fisheries interactions and to the effects of climate change. The occurrence of leatherback turtles within both coastal and pelagic areas means they have a high risk of exposure to many different fisheries, which may be very distant from their nesting sites. The EP leatherbacks have more limited foraging grounds than the WP leatherbacks, which could make them more susceptible to any temperature or prey changes that occur in response to climate change.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Identification of distinct movement patterns in Pacific leatherback turtle populations influenced by ocean conditions
- Date Crossref
- 01/04/2012
- Éditeur
- Wiley
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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University of Maryland Center for Environmental Science Chesapeake Biological Laboratory pays non établi dans la noticeUniversité ou école supérieure
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NOAA National Marine Fisheries Service Southwest Fisheries Science Center pays non établi dans la noticeOrganisme public
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Torrey Pines Institute For Molecular Studies pays non établi dans la noticeOrganisation à but non lucratif
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Pacific University pays non établi dans la noticeUniversité ou école supérieure
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Hopkins Marine Station pays non établi dans la noticeStructure de recherche
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Stanford University pays non établi dans la noticeUniversité ou école supérieure
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Sea Turtle Conservancy pays non établi dans la noticeOrganisation à but non lucratif
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Principia College Present address: Department of Biology and Natural Resources pays non établi dans la noticeUniversité ou école supérieure
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Cornell University Department of Natural Resources pays non établi dans la noticeUniversité ou école supérieure
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Louisiana Department of Natural Resources pays non établi dans la noticeOrganisme public
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Indiana University – Purdue University Fort Wayne pays non établi dans la noticeUniversité ou école supérieure
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University of Hawaii System Joint Institute for Marine and Atmospheric Research pays non établi dans la noticeUniversité ou école supérieure
Chesapeake Biological Laboratory — University of Maryland Center for Environmental Science, NOAA National Marine Fisheries Service Southwest Fisheries Science Center et Torrey Pines Institute For Molecular Studies, avec 9 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.