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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Crossing the line: Migratory and homing behaviors of Atlantic bluefin tuna
Marine Ecology Progress Series, Volume 504, Year 2014
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Description
Assessment and management of Atlantic bluefin tuna Thunnus thynnus populations is hindered by our lack of knowledge regarding trans-Atlantic movement and connectivity of eastern and western populations. Here, we evaluated migratory and homing behaviors of bluefin tuna in several regions of the North Atlantic Ocean and Mediterranean Sea using chemical tags (δ13C and δ18O) in otoliths. Significant emigration of bluefin tuna from their place of origin was inferred from otolith δ13C and δ18O, with both eastern and western bluefin tuna commonly 'crossing the line' (45° W management boundary) in the Central North Atlantic Ocean and mixing with the other population. Several western migrants were also detected in Moroccan traps off the coast of Africa, indicating that trans-Atlantic movement occurs for members of the western population; however, the degree of mixing declined with proximity to the eastern spawning area (Mediterranean Sea). The origin of bluefin tuna collected at the entrance to the Strait of Gibraltar and from several regions within the Mediterranean Sea (Balearic Islands, Malta, and Sardinia) was essentially 100% eastern fish, demonstrating that natal homing is well developed by the eastern population, with western migrants rarely entering the Mediterranean Sea. © Inter-Research 2014.
Authors & Co-Authors
Rooker, Jay R.
United States, Galveston
Texas a and M University at Galveston
Arrizabalaga, Haritz
Spain, Derio
Azti Fundazioa
Fraile, Igaratza
Spain, Derio
Azti Fundazioa
Secor, David
United States, Cambridge
University of Maryland Center for Environmental Science
Dettman, David L.
United States, Tucson
The University of Arizona
Abid, Noureddine
Morocco, Tanger
Inrh
Addis, Pierantonio
Italy, Cagliari
Università Degli Studi Di Cagliari
Deguara, Simeon
Unknown Affiliation
Karakulak, F. Saadet
Turkey, Istanbul
Istanbul Üniversitesi
Kimoto, Ai
Japan, Shizuoka
National Research Institute of Far Seas Fisheries, Fra
Sakai, Osamu
Japan, Shizuoka
National Research Institute of Far Seas Fisheries, Fra
Macías, D.
Spain, Madrid
Csic-ieo - Instituto Español de Oceanografía
Santos, Miguel Neves Dos
Portugal, Lisbon
Instituto Português do Mar e da Atmosfera
Statistics
Citations: 107
Authors: 13
Affiliations: 10
Identifiers
Doi:
10.3354/meps10781
Study Design
Cross Sectional Study