Oceanographic changes and exploitation drive the spatio-temporal dynamics of Atlantic bluefin tuna (Thunnus thynnus)
Atlantic bluefin tuna (ABFT) has always displayed spectacular changes in its spatial distribution, but the underlying mechanism of such variations still remains obscure. This study focuses on this challenging issue by scrutinizing the intriguing ‘Brazilian episode’ during which a large quantity of A...
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ftarchimer:oai:archimer.ifremer.fr:27540 2023-05-15T17:34:53+02:00 Oceanographic changes and exploitation drive the spatio-temporal dynamics of Atlantic bluefin tuna (Thunnus thynnus) Fromentin, Jean-marc Reygondeau, Gabriel Bonhommeau, Sylvain Beaugrand, Gregory 2014-03 application/pdf https://archimer.ifremer.fr/doc/00164/27540/25819.pdf https://doi.org/10.1111/fog.12050 https://archimer.ifremer.fr/doc/00164/27540/ eng eng Wiley-blackwell https://archimer.ifremer.fr/doc/00164/27540/25819.pdf doi:10.1111/fog.12050 https://archimer.ifremer.fr/doc/00164/27540/ 2013 John Wiley & Sons Ltd info:eu-repo/semantics/openAccess restricted use Fisheries Oceanography (1054-6006) (Wiley-blackwell), 2014-03 , Vol. 23 , N. 2 , P. 147-156 ecological niche model longline fisheries migration synergistic effects Thunnus thynnus time series text Publication info:eu-repo/semantics/article 2014 ftarchimer https://doi.org/10.1111/fog.12050 2021-09-23T20:23:40Z Atlantic bluefin tuna (ABFT) has always displayed spectacular changes in its spatial distribution, but the underlying mechanism of such variations still remains obscure. This study focuses on this challenging issue by scrutinizing the intriguing ‘Brazilian episode’ during which a large quantity of ABFT (a temperate species) was caught during the 1960s in the equatorial Atlantic. To investigate this event, we applied a niche model to an extensive data set of catch and environmental variables from 1960 to 2009. ABFT exhibited a remarkably large ecological niche, which matches well with our current knowledge of ABFT. Our results also depicted a high probability of ABFT occurrence in the South Atlantic and, more interestingly, favorable environmental conditions in the western equatorial Atlantic during the 1960s, but not later. ABFT could thus have migrated from their northern spawning grounds to the South Atlantic during the 1960s through the western equatorial Atlantic, playing the role of an ‘ecological bridge’. We argue that the rarity of ABFT in the southern Atlantic during the last four decades would result from the interaction of several processes, particularly oceanographic conditions, migratory behavior, density-dependence, exploitation levels and population structure. Examination of the catch data further indicated that the fish caught in the equatorial Atlantic were from the western stock and we concluded that the lack of rebuilding of this stock could result from a regime shift due to the combination of oceanographic changes in the equatorial Atlantic and overfishing in the North Atlantic in the 1960s and 1970s. Article in Journal/Newspaper North Atlantic Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Fisheries Oceanography 23 2 147 156 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
ecological niche model longline fisheries migration synergistic effects Thunnus thynnus time series |
spellingShingle |
ecological niche model longline fisheries migration synergistic effects Thunnus thynnus time series Fromentin, Jean-marc Reygondeau, Gabriel Bonhommeau, Sylvain Beaugrand, Gregory Oceanographic changes and exploitation drive the spatio-temporal dynamics of Atlantic bluefin tuna (Thunnus thynnus) |
topic_facet |
ecological niche model longline fisheries migration synergistic effects Thunnus thynnus time series |
description |
Atlantic bluefin tuna (ABFT) has always displayed spectacular changes in its spatial distribution, but the underlying mechanism of such variations still remains obscure. This study focuses on this challenging issue by scrutinizing the intriguing ‘Brazilian episode’ during which a large quantity of ABFT (a temperate species) was caught during the 1960s in the equatorial Atlantic. To investigate this event, we applied a niche model to an extensive data set of catch and environmental variables from 1960 to 2009. ABFT exhibited a remarkably large ecological niche, which matches well with our current knowledge of ABFT. Our results also depicted a high probability of ABFT occurrence in the South Atlantic and, more interestingly, favorable environmental conditions in the western equatorial Atlantic during the 1960s, but not later. ABFT could thus have migrated from their northern spawning grounds to the South Atlantic during the 1960s through the western equatorial Atlantic, playing the role of an ‘ecological bridge’. We argue that the rarity of ABFT in the southern Atlantic during the last four decades would result from the interaction of several processes, particularly oceanographic conditions, migratory behavior, density-dependence, exploitation levels and population structure. Examination of the catch data further indicated that the fish caught in the equatorial Atlantic were from the western stock and we concluded that the lack of rebuilding of this stock could result from a regime shift due to the combination of oceanographic changes in the equatorial Atlantic and overfishing in the North Atlantic in the 1960s and 1970s. |
format |
Article in Journal/Newspaper |
author |
Fromentin, Jean-marc Reygondeau, Gabriel Bonhommeau, Sylvain Beaugrand, Gregory |
author_facet |
Fromentin, Jean-marc Reygondeau, Gabriel Bonhommeau, Sylvain Beaugrand, Gregory |
author_sort |
Fromentin, Jean-marc |
title |
Oceanographic changes and exploitation drive the spatio-temporal dynamics of Atlantic bluefin tuna (Thunnus thynnus) |
title_short |
Oceanographic changes and exploitation drive the spatio-temporal dynamics of Atlantic bluefin tuna (Thunnus thynnus) |
title_full |
Oceanographic changes and exploitation drive the spatio-temporal dynamics of Atlantic bluefin tuna (Thunnus thynnus) |
title_fullStr |
Oceanographic changes and exploitation drive the spatio-temporal dynamics of Atlantic bluefin tuna (Thunnus thynnus) |
title_full_unstemmed |
Oceanographic changes and exploitation drive the spatio-temporal dynamics of Atlantic bluefin tuna (Thunnus thynnus) |
title_sort |
oceanographic changes and exploitation drive the spatio-temporal dynamics of atlantic bluefin tuna (thunnus thynnus) |
publisher |
Wiley-blackwell |
publishDate |
2014 |
url |
https://archimer.ifremer.fr/doc/00164/27540/25819.pdf https://doi.org/10.1111/fog.12050 https://archimer.ifremer.fr/doc/00164/27540/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Fisheries Oceanography (1054-6006) (Wiley-blackwell), 2014-03 , Vol. 23 , N. 2 , P. 147-156 |
op_relation |
https://archimer.ifremer.fr/doc/00164/27540/25819.pdf doi:10.1111/fog.12050 https://archimer.ifremer.fr/doc/00164/27540/ |
op_rights |
2013 John Wiley & Sons Ltd info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1111/fog.12050 |
container_title |
Fisheries Oceanography |
container_volume |
23 |
container_issue |
2 |
container_start_page |
147 |
op_container_end_page |
156 |
_version_ |
1766133851882520576 |