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      The strength of migratory connectivity for birds en route to breeding through the Gulf of Mexico

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          Links between worlds: unraveling migratory connectivity

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            Electronic tagging and population structure of Atlantic bluefin tuna.

            Electronic tags that archive or transmit stored data to satellites have advanced the mapping of habitats used by highly migratory fish in pelagic ecosystems. Here we report on the electronic tagging of 772 Atlantic bluefin tuna in the western Atlantic Ocean in an effort to identify population structure. Reporting electronic tags provided accurate location data that show the extensive migrations of individual fish (n = 330). Geoposition data delineate two populations, one using spawning grounds in the Gulf of Mexico and another from the Mediterranean Sea. Transatlantic movements of western-tagged bluefin tuna reveal site fidelity to known spawning areas in the Mediterranean Sea. Bluefin tuna that occupy western spawning grounds move to central and eastern Atlantic foraging grounds. Our results are consistent with two populations of bluefin tuna with distinct spawning areas that overlap on North Atlantic foraging grounds. Electronic tagging locations, when combined with US pelagic longline observer and logbook catch data, identify hot spots for spawning bluefin tuna in the northern slope waters of the Gulf of Mexico. Restrictions on the time and area where longlining occurs would reduce incidental catch mortalities on western spawning grounds.
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              Linking Winter and Summer Events in a Migratory Bird by Using Stable-Carbon Isotopes

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                Author and article information

                Journal
                Ecography
                Ecography
                Wiley
                09067590
                October 2018
                October 2018
                October 16 2018
                Affiliations
                [1 ]Migratory Bird Center, Smithsonian Conservation Biology Inst., National Zoological Park; Washington D.C USA
                [2 ]United States Geologic Survey, Patuxent Wildlife Research Center; Laurel MD USA
                [3 ]Univ. of Southern Mississippi, Dept of Biological Sciences; Hattiesburg MS USA
                [4 ]Fish and Wildlife Research Inst., Florida Fish and Wildlife Conservation Commission; St Petersburg FL USA
                [5 ]Dept of Biology, Univ. of Massachusetts; Amherst MA USA
                Article
                10.1111/ecog.03974
                db7f8d75-5a8a-44f7-87e0-8c3c95081f54
                © 2018

                http://doi.wiley.com/10.1002/tdm_license_1.1

                http://onlinelibrary.wiley.com/termsAndConditions#vor

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