Atlantic Bluefin Tuna (Thunnus thynnus) population dynamics delineated by organochlorine tracers
Atlantic bluefin tuna (ABFT) are highly valued and heavily exploited, and critical uncertainties regarding their population structure hinder effective management. Evidence supports the existence of two breeding populations of ABFT; a western population in the Gulf of Mexico and an eastern population...
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Online Access: | http://hdl.handle.net/11365/10689 https://doi.org/10.1021/es901810e |
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ftunivsiena:oai:usiena-air.unisi.it:11365/10689 2024-04-21T08:07:27+00:00 Atlantic Bluefin Tuna (Thunnus thynnus) population dynamics delineated by organochlorine tracers DICKHUT, R. M. DESHPANDE, A. D. CINCINELLI, A. COCHRAN, M. A. CORSOLINI, S. BRILL, R. W. SECOR, D. H. GRAVES, J. E. Dickhut, R. M. Deshpande, A. D. Cincinelli, A. Cochran, M. A. Corsolini, S. Brill, R. W. Secor, D. H. Graves, J. E. 2009 STAMPA http://hdl.handle.net/11365/10689 https://doi.org/10.1021/es901810e eng eng info:eu-repo/semantics/altIdentifier/pmid/20028046 info:eu-repo/semantics/altIdentifier/wos/WOS:000271583400012 volume:43 issue:22 firstpage:8522 lastpage:8527 numberofpages:6 journal:ENVIRONMENTAL SCIENCE & TECHNOLOGY http://hdl.handle.net/11365/10689 doi:10.1021/es901810e info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-72249119051 info:eu-repo/semantics/article 2009 ftunivsiena https://doi.org/10.1021/es901810e 2024-03-28T00:52:42Z Atlantic bluefin tuna (ABFT) are highly valued and heavily exploited, and critical uncertainties regarding their population structure hinder effective management. Evidence supports the existence of two breeding populations of ABFT; a western population in the Gulf of Mexico and an eastern population in the Mediterranean Sea; both of which migrate and mix in the North Atlantic. Conventional tagging studies suggest low rates of trans-Atlantic migrations; however, electronic tagging and stable isotopes in otoliths indicate stock mixing up to 57% between management zones delineated by 45° W longitude. Here we show that organochlorine pesticides and polychlorinated biphenyls (PCBs) can be used as tracers of bluefin tuna foraging grounds in the North Atlantic and confirm that stock mixing of juvenile tuna within the U.S. Mid Atlantic Bight is indeed high (33−83% eastern origin), and is likely spatially and temporally variable. We further demonstrate that >10% of the Mediterranean population is migratory, that young bluefin tuna migrate from the Mediterranean to western Atlantic foraging grounds as early as age 1, and then return to the Mediterranean Sea as young as age 5, presumably to breed. The tracer method described here provides a novel means for distinguishing bluefin tuna populations and ontogenetic shifts in migration in the North Atlantic. Article in Journal/Newspaper North Atlantic Università degli Studi di Siena: USiena air Environmental Science & Technology 43 22 8522 8527 |
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Open Polar |
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Università degli Studi di Siena: USiena air |
op_collection_id |
ftunivsiena |
language |
English |
description |
Atlantic bluefin tuna (ABFT) are highly valued and heavily exploited, and critical uncertainties regarding their population structure hinder effective management. Evidence supports the existence of two breeding populations of ABFT; a western population in the Gulf of Mexico and an eastern population in the Mediterranean Sea; both of which migrate and mix in the North Atlantic. Conventional tagging studies suggest low rates of trans-Atlantic migrations; however, electronic tagging and stable isotopes in otoliths indicate stock mixing up to 57% between management zones delineated by 45° W longitude. Here we show that organochlorine pesticides and polychlorinated biphenyls (PCBs) can be used as tracers of bluefin tuna foraging grounds in the North Atlantic and confirm that stock mixing of juvenile tuna within the U.S. Mid Atlantic Bight is indeed high (33−83% eastern origin), and is likely spatially and temporally variable. We further demonstrate that >10% of the Mediterranean population is migratory, that young bluefin tuna migrate from the Mediterranean to western Atlantic foraging grounds as early as age 1, and then return to the Mediterranean Sea as young as age 5, presumably to breed. The tracer method described here provides a novel means for distinguishing bluefin tuna populations and ontogenetic shifts in migration in the North Atlantic. |
author2 |
Dickhut, R. M. Deshpande, A. D. Cincinelli, A. Cochran, M. A. Corsolini, S. Brill, R. W. Secor, D. H. Graves, J. E. |
format |
Article in Journal/Newspaper |
author |
DICKHUT, R. M. DESHPANDE, A. D. CINCINELLI, A. COCHRAN, M. A. CORSOLINI, S. BRILL, R. W. SECOR, D. H. GRAVES, J. E. |
spellingShingle |
DICKHUT, R. M. DESHPANDE, A. D. CINCINELLI, A. COCHRAN, M. A. CORSOLINI, S. BRILL, R. W. SECOR, D. H. GRAVES, J. E. Atlantic Bluefin Tuna (Thunnus thynnus) population dynamics delineated by organochlorine tracers |
author_facet |
DICKHUT, R. M. DESHPANDE, A. D. CINCINELLI, A. COCHRAN, M. A. CORSOLINI, S. BRILL, R. W. SECOR, D. H. GRAVES, J. E. |
author_sort |
DICKHUT, R. M. |
title |
Atlantic Bluefin Tuna (Thunnus thynnus) population dynamics delineated by organochlorine tracers |
title_short |
Atlantic Bluefin Tuna (Thunnus thynnus) population dynamics delineated by organochlorine tracers |
title_full |
Atlantic Bluefin Tuna (Thunnus thynnus) population dynamics delineated by organochlorine tracers |
title_fullStr |
Atlantic Bluefin Tuna (Thunnus thynnus) population dynamics delineated by organochlorine tracers |
title_full_unstemmed |
Atlantic Bluefin Tuna (Thunnus thynnus) population dynamics delineated by organochlorine tracers |
title_sort |
atlantic bluefin tuna (thunnus thynnus) population dynamics delineated by organochlorine tracers |
publishDate |
2009 |
url |
http://hdl.handle.net/11365/10689 https://doi.org/10.1021/es901810e |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
info:eu-repo/semantics/altIdentifier/pmid/20028046 info:eu-repo/semantics/altIdentifier/wos/WOS:000271583400012 volume:43 issue:22 firstpage:8522 lastpage:8527 numberofpages:6 journal:ENVIRONMENTAL SCIENCE & TECHNOLOGY http://hdl.handle.net/11365/10689 doi:10.1021/es901810e info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-72249119051 |
op_doi |
https://doi.org/10.1021/es901810e |
container_title |
Environmental Science & Technology |
container_volume |
43 |
container_issue |
22 |
container_start_page |
8522 |
op_container_end_page |
8527 |
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1796947302128025600 |