Wide-Ranging Temporal Variation in Transoceanic Movement and Population Mixing of Bluefin Tuna in the North Atlantic Ocean
Uncertainty regarding the movement and population exchange of Atlantic bluefin tuna (Thunnus thynnus) from the two primary spawning areas (Gulf of Mexico, Mediterranean Sea) is increasingly implicated as a major impediment for the conservation of this species. Here, two mixture methods were applied...
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ftlouisianastuir:oai:repository.lsu.edu:oceanography_coastal_pubs-1006 2024-09-15T18:22:17+00:00 Wide-Ranging Temporal Variation in Transoceanic Movement and Population Mixing of Bluefin Tuna in the North Atlantic Ocean Dance, Michael A. 2019-07-07T07:00:00Z application/pdf https://repository.lsu.edu/oceanography_coastal_pubs/7 https://doi.org/10.3389/fmars.2019.00398 https://repository.lsu.edu/context/oceanography_coastal_pubs/article/1006/viewcontent/Dance_fmars_06_00398.pdf unknown LSU Scholarly Repository https://repository.lsu.edu/oceanography_coastal_pubs/7 doi:10.3389/fmars.2019.00398 https://repository.lsu.edu/context/oceanography_coastal_pubs/article/1006/viewcontent/Dance_fmars_06_00398.pdf Faculty Publications migration natal origin stock mixing Mediterranean Sea otolith chemistry stable isotopes THUNNUS-THYNNUS MULTIDECADAL OSCILLATION CANADIAN WATERS LIFE-HISTORY PATTERNS PACIFIC CONNECTIVITY TRACKING Oceanography text 2019 ftlouisianastuir https://doi.org/10.3389/fmars.2019.00398 2024-08-08T04:27:15Z Uncertainty regarding the movement and population exchange of Atlantic bluefin tuna (Thunnus thynnus) from the two primary spawning areas (Gulf of Mexico, Mediterranean Sea) is increasingly implicated as a major impediment for the conservation of this species. Here, two mixture methods were applied to natural chemical markers (delta O-18 and delta C-13) in otoliths (ear stones) to comprehensively investigate the nature and degree of transoceanic movement and mixing of eastern and western populations in several areas of the North Atlantic Ocean that potentially represent mixing hotspots. Areas investigated occurred on both sides of the 45 degrees W management boundary as well as waters off the coast of Africa (Morocco, Canary Islands) where both populations are known to occur. Projections of population composition (i.e., natal or nursery origin) from a multinomial logistic regression (MLR) classification method with different probability thresholds were generally in agreement with maximum likelihood estimates from the commonly used mixed-population program HISEA; however, predicted contributions for the less abundant population were occasionally higher for MLR estimates. Both MLR and HISEA clearly showed that mixing of Atlantic bluefin tuna in the Central North Atlantic Ocean was highly variable from year to year with expatriates of eastern or western origin commonly crossing into the other management area. Pronounced transoceanic movement and mixing of western migrants was also present off the coast of Africa, with the occurrence of western migrants in the Canary Islands and Morocco ranging from zero to the majority of the individuals assayed for the years examined. Results indicate highly variable rates of movement and population exchange for Atlantic bluefin tuna, highlighting the need for temporally resolved estimates of natal origin in mixing hotspots to improve population models used to evaluate the status of this threatened species. Text North Atlantic LSU Digital Commons (Louisiana State University) Frontiers in Marine Science 6 |
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Open Polar |
collection |
LSU Digital Commons (Louisiana State University) |
op_collection_id |
ftlouisianastuir |
language |
unknown |
topic |
migration natal origin stock mixing Mediterranean Sea otolith chemistry stable isotopes THUNNUS-THYNNUS MULTIDECADAL OSCILLATION CANADIAN WATERS LIFE-HISTORY PATTERNS PACIFIC CONNECTIVITY TRACKING Oceanography |
spellingShingle |
migration natal origin stock mixing Mediterranean Sea otolith chemistry stable isotopes THUNNUS-THYNNUS MULTIDECADAL OSCILLATION CANADIAN WATERS LIFE-HISTORY PATTERNS PACIFIC CONNECTIVITY TRACKING Oceanography Dance, Michael A. Wide-Ranging Temporal Variation in Transoceanic Movement and Population Mixing of Bluefin Tuna in the North Atlantic Ocean |
topic_facet |
migration natal origin stock mixing Mediterranean Sea otolith chemistry stable isotopes THUNNUS-THYNNUS MULTIDECADAL OSCILLATION CANADIAN WATERS LIFE-HISTORY PATTERNS PACIFIC CONNECTIVITY TRACKING Oceanography |
description |
Uncertainty regarding the movement and population exchange of Atlantic bluefin tuna (Thunnus thynnus) from the two primary spawning areas (Gulf of Mexico, Mediterranean Sea) is increasingly implicated as a major impediment for the conservation of this species. Here, two mixture methods were applied to natural chemical markers (delta O-18 and delta C-13) in otoliths (ear stones) to comprehensively investigate the nature and degree of transoceanic movement and mixing of eastern and western populations in several areas of the North Atlantic Ocean that potentially represent mixing hotspots. Areas investigated occurred on both sides of the 45 degrees W management boundary as well as waters off the coast of Africa (Morocco, Canary Islands) where both populations are known to occur. Projections of population composition (i.e., natal or nursery origin) from a multinomial logistic regression (MLR) classification method with different probability thresholds were generally in agreement with maximum likelihood estimates from the commonly used mixed-population program HISEA; however, predicted contributions for the less abundant population were occasionally higher for MLR estimates. Both MLR and HISEA clearly showed that mixing of Atlantic bluefin tuna in the Central North Atlantic Ocean was highly variable from year to year with expatriates of eastern or western origin commonly crossing into the other management area. Pronounced transoceanic movement and mixing of western migrants was also present off the coast of Africa, with the occurrence of western migrants in the Canary Islands and Morocco ranging from zero to the majority of the individuals assayed for the years examined. Results indicate highly variable rates of movement and population exchange for Atlantic bluefin tuna, highlighting the need for temporally resolved estimates of natal origin in mixing hotspots to improve population models used to evaluate the status of this threatened species. |
format |
Text |
author |
Dance, Michael A. |
author_facet |
Dance, Michael A. |
author_sort |
Dance, Michael A. |
title |
Wide-Ranging Temporal Variation in Transoceanic Movement and Population Mixing of Bluefin Tuna in the North Atlantic Ocean |
title_short |
Wide-Ranging Temporal Variation in Transoceanic Movement and Population Mixing of Bluefin Tuna in the North Atlantic Ocean |
title_full |
Wide-Ranging Temporal Variation in Transoceanic Movement and Population Mixing of Bluefin Tuna in the North Atlantic Ocean |
title_fullStr |
Wide-Ranging Temporal Variation in Transoceanic Movement and Population Mixing of Bluefin Tuna in the North Atlantic Ocean |
title_full_unstemmed |
Wide-Ranging Temporal Variation in Transoceanic Movement and Population Mixing of Bluefin Tuna in the North Atlantic Ocean |
title_sort |
wide-ranging temporal variation in transoceanic movement and population mixing of bluefin tuna in the north atlantic ocean |
publisher |
LSU Scholarly Repository |
publishDate |
2019 |
url |
https://repository.lsu.edu/oceanography_coastal_pubs/7 https://doi.org/10.3389/fmars.2019.00398 https://repository.lsu.edu/context/oceanography_coastal_pubs/article/1006/viewcontent/Dance_fmars_06_00398.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Faculty Publications |
op_relation |
https://repository.lsu.edu/oceanography_coastal_pubs/7 doi:10.3389/fmars.2019.00398 https://repository.lsu.edu/context/oceanography_coastal_pubs/article/1006/viewcontent/Dance_fmars_06_00398.pdf |
op_doi |
https://doi.org/10.3389/fmars.2019.00398 |
container_title |
Frontiers in Marine Science |
container_volume |
6 |
_version_ |
1810461922695315456 |