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Sailfish migrations connect productive coastal areas in the West Atlantic Ocean
Lam, C.H.; Galuardi, B.; Mendillo, A.; Chandler, E.; Lutcavage, M.E. (2016). Sailfish migrations connect productive coastal areas in the West Atlantic Ocean. NPG Scientific Reports 6(38163): 14 pp. http://dx.doi.org/10.1038/srep38163
In: Scientific Reports (Nature Publishing Group). Nature Publishing Group: London. ISSN 2045-2322; e-ISSN 2045-2322
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| Auteurs | | Top |
- Lam, C.H.
- Galuardi, B.
- Mendillo, A.
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- Chandler, E.
- Lutcavage, M.E.
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| Abstract |
Isla Mujeres, Mexico is home to one of the most well-known aggregations of sailfish. Despite its fisheries prominence, little is known about this sailfish assemblage, or its relationship to other aggregation sites in the western Atlantic. In January 2012, April 2013 and 2014, we deployed 34 popup satellite archival tags on sailfish in order to study their behavior, population connectivity and biophysical interactions. Sailfish were monitored for up to one year, and displayed (1) predominantly shelf associated activity (2) occupancy of the Yucatan Current near Isla Mujeres for up to five months and (3) subsequent dispersals from the Yucatan to productive coastal areas in the Gulf of Mexico, the Caribbean Sea and along the South American coast. Tagged sailfish occupied a median temperature of 26.4 degrees C (interquartile range, IQR = 2.5 degrees C; range = 12.3-33.3 degrees C) and median depth of 4.4 m (IQR = 19 m; range = 0-452 m). Diel activity was present and individuals made distinctive descents before sunrise and sunset. Tracking missions of sufficient duration (similar to 1 year) revealed previously undetected connectivity between western Atlantic sailfish fisheries and pelagic longline catches, and highlighted how fishery independent tagging can improve understanding of sailfish migrations and behavior for assessment and management. |
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