Multi-decadal trends in contingent mixing of Atlantic mackerel (Scomber scombrus) in the Northwest Atlantic from otolith stable isotopes

Abstract The Atlantic mackerel ( Scomber scombrus ) in the Northwest Atlantic is comprised of northern and southern components that have distinct spawning sites off Canada (northern contingent) and the US (southern contingent), and seasonally overlap in US fished regions. Thus, assessment and manage...

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Published in:Scientific Reports
Main Authors: Arai, Kohma, Castonguay, Martin, Secor, David H.
Other Authors: Fisheries and Oceans Canada
Format: Article in Journal/Newspaper
Language:English
Published: Springer Science and Business Media LLC 2021
Subjects:
Online Access:http://dx.doi.org/10.1038/s41598-021-86116-2
http://www.nature.com/articles/s41598-021-86116-2.pdf
http://www.nature.com/articles/s41598-021-86116-2
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spelling crspringernat:10.1038/s41598-021-86116-2 2023-05-15T17:45:31+02:00 Multi-decadal trends in contingent mixing of Atlantic mackerel (Scomber scombrus) in the Northwest Atlantic from otolith stable isotopes Arai, Kohma Castonguay, Martin Secor, David H. Fisheries and Oceans Canada 2021 http://dx.doi.org/10.1038/s41598-021-86116-2 http://www.nature.com/articles/s41598-021-86116-2.pdf http://www.nature.com/articles/s41598-021-86116-2 en eng Springer Science and Business Media LLC https://creativecommons.org/licenses/by/4.0 https://creativecommons.org/licenses/by/4.0 CC-BY Scientific Reports volume 11, issue 1 ISSN 2045-2322 Multidisciplinary journal-article 2021 crspringernat https://doi.org/10.1038/s41598-021-86116-2 2022-01-04T14:22:31Z Abstract The Atlantic mackerel ( Scomber scombrus ) in the Northwest Atlantic is comprised of northern and southern components that have distinct spawning sites off Canada (northern contingent) and the US (southern contingent), and seasonally overlap in US fished regions. Thus, assessment and management of this population can be sensitive to levels of mixing between contingents, which remain unknown. Multi-decadal trends in contingent mixing levels within the US fisheries region were assessed, and the contingent composition across seasons, locations, ages, and size classes were characterized using archived otoliths and developing a classification baseline based on juvenile otolith carbon and oxygen stable isotopes (δ 13 C/δ 18 O values). Classification of age ≥ 2 adults demonstrated that northern contingent mixing was prevalent within the US continental shelf waters during the past 2 decades (2000–2019), providing an important seasonal subsidy to the US winter fishery despite substantial depletion in spawning stock biomass of the dominant northern contingent. While the majority of older fish were of the northern contingent during the early 2000s, the southern contingent contribution increased with age/size class during the recent period (2013–2019). Spatial mixing was most prevalent during February and March when the northern contingent occurred as far south as the Delmarva Peninsula, but were mostly absent from US waters in May. A positive relationship (albeit not significant; r = 0.60, p = 0.07) occurred between northern contingent mixing and US fisheries landings, which could imply that higher contingent mixing levels might be associated with greater landings for the US winter mackerel fishery. The yield of the Northwest Atlantic mackerel depends upon the status of the northern contingent, with the southern contingent possibly more prone to depletion. Spatially explicit stock assessment models are recommended to conserve both productivity and stability in this two-component population. Article in Journal/Newspaper Northwest Atlantic Springer Nature (via Crossref) Canada Scientific Reports 11 1
institution Open Polar
collection Springer Nature (via Crossref)
op_collection_id crspringernat
language English
topic Multidisciplinary
spellingShingle Multidisciplinary
Arai, Kohma
Castonguay, Martin
Secor, David H.
Multi-decadal trends in contingent mixing of Atlantic mackerel (Scomber scombrus) in the Northwest Atlantic from otolith stable isotopes
topic_facet Multidisciplinary
description Abstract The Atlantic mackerel ( Scomber scombrus ) in the Northwest Atlantic is comprised of northern and southern components that have distinct spawning sites off Canada (northern contingent) and the US (southern contingent), and seasonally overlap in US fished regions. Thus, assessment and management of this population can be sensitive to levels of mixing between contingents, which remain unknown. Multi-decadal trends in contingent mixing levels within the US fisheries region were assessed, and the contingent composition across seasons, locations, ages, and size classes were characterized using archived otoliths and developing a classification baseline based on juvenile otolith carbon and oxygen stable isotopes (δ 13 C/δ 18 O values). Classification of age ≥ 2 adults demonstrated that northern contingent mixing was prevalent within the US continental shelf waters during the past 2 decades (2000–2019), providing an important seasonal subsidy to the US winter fishery despite substantial depletion in spawning stock biomass of the dominant northern contingent. While the majority of older fish were of the northern contingent during the early 2000s, the southern contingent contribution increased with age/size class during the recent period (2013–2019). Spatial mixing was most prevalent during February and March when the northern contingent occurred as far south as the Delmarva Peninsula, but were mostly absent from US waters in May. A positive relationship (albeit not significant; r = 0.60, p = 0.07) occurred between northern contingent mixing and US fisheries landings, which could imply that higher contingent mixing levels might be associated with greater landings for the US winter mackerel fishery. The yield of the Northwest Atlantic mackerel depends upon the status of the northern contingent, with the southern contingent possibly more prone to depletion. Spatially explicit stock assessment models are recommended to conserve both productivity and stability in this two-component population.
author2 Fisheries and Oceans Canada
format Article in Journal/Newspaper
author Arai, Kohma
Castonguay, Martin
Secor, David H.
author_facet Arai, Kohma
Castonguay, Martin
Secor, David H.
author_sort Arai, Kohma
title Multi-decadal trends in contingent mixing of Atlantic mackerel (Scomber scombrus) in the Northwest Atlantic from otolith stable isotopes
title_short Multi-decadal trends in contingent mixing of Atlantic mackerel (Scomber scombrus) in the Northwest Atlantic from otolith stable isotopes
title_full Multi-decadal trends in contingent mixing of Atlantic mackerel (Scomber scombrus) in the Northwest Atlantic from otolith stable isotopes
title_fullStr Multi-decadal trends in contingent mixing of Atlantic mackerel (Scomber scombrus) in the Northwest Atlantic from otolith stable isotopes
title_full_unstemmed Multi-decadal trends in contingent mixing of Atlantic mackerel (Scomber scombrus) in the Northwest Atlantic from otolith stable isotopes
title_sort multi-decadal trends in contingent mixing of atlantic mackerel (scomber scombrus) in the northwest atlantic from otolith stable isotopes
publisher Springer Science and Business Media LLC
publishDate 2021
url http://dx.doi.org/10.1038/s41598-021-86116-2
http://www.nature.com/articles/s41598-021-86116-2.pdf
http://www.nature.com/articles/s41598-021-86116-2
geographic Canada
geographic_facet Canada
genre Northwest Atlantic
genre_facet Northwest Atlantic
op_source Scientific Reports
volume 11, issue 1
ISSN 2045-2322
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