Poleward spawning of Atlantic mackerel ( Scomber scombrus) is facilitated by ocean warming but triggered by energetic constraints
Abstract The Northeast Atlantic mackerel is an income breeder with indeterminate fecundity, spawning in multiple batches at optimal temperatures around 11°C in the upper water column during February–July along the continental shelf from 36–62°N. Based on macroscopic staging of gonads (N ∼62000) coll...
Published in: | ICES Journal of Marine Science |
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Language: | English |
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Oxford University Press (OUP)
2023
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsad098 https://academic.oup.com/icesjms/article-pdf/81/3/600/57332230/fsad098.pdf |
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croxfordunivpr:10.1093/icesjms/fsad098 2024-09-15T18:25:25+00:00 Poleward spawning of Atlantic mackerel ( Scomber scombrus) is facilitated by ocean warming but triggered by energetic constraints dos Santos Schmidt, T C Slotte, A Olafsdottir, A H Nøttestad, L Jansen, T Jacobsen, J A Bjarnason, S Lusseau, S M Ono, K Hølleland, S Thorsen, A Sandø, A B Kjesbu, O S Bartolino, Valerio Norwegian Fisheries Research Sale Tax System Institute of Marine Research Norwegian Research Council 2023 http://dx.doi.org/10.1093/icesjms/fsad098 https://academic.oup.com/icesjms/article-pdf/81/3/600/57332230/fsad098.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ ICES Journal of Marine Science volume 81, issue 3, page 600-615 ISSN 1054-3139 1095-9289 journal-article 2023 croxfordunivpr https://doi.org/10.1093/icesjms/fsad098 2024-07-29T04:19:42Z Abstract The Northeast Atlantic mackerel is an income breeder with indeterminate fecundity, spawning in multiple batches at optimal temperatures around 11°C in the upper water column during February–July along the continental shelf from 36–62°N. Based on macroscopic staging of gonads (N ∼62000) collected in 2004–2021, we detected an on-going extension of spawning activities into the Norwegian Sea feeding area (62–75°N), reaching stable levels around 2012 onwards. This poleward expansion increased as more fish entered the area, whilst the maximum proportions of spawners concurrently dropped from about 75 to 15% from May to July. Detailed histological examinations in 2018 confirmed the macroscopic results but clarified that 38% of the spawning-capable females in July terminated their spawning by atresia. We suggest that increased access to suitable spawning areas (≥10°C), following ocean warming from 2002 onwards, functions as a proximate cause behind the noticed expansion, whereas the ultimate trigger was the historic drop in body growth and condition about 10 years later. Driven by these energetic constraints, mackerel likely spawn in the direction of high prey concentrations to rebuild body resources and secure the future rather than current reproduction success. The ambient temperature that far north is considered suboptimal for egg and larval survival. Article in Journal/Newspaper Northeast Atlantic Norwegian Sea Oxford University Press ICES Journal of Marine Science |
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Open Polar |
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Oxford University Press |
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croxfordunivpr |
language |
English |
description |
Abstract The Northeast Atlantic mackerel is an income breeder with indeterminate fecundity, spawning in multiple batches at optimal temperatures around 11°C in the upper water column during February–July along the continental shelf from 36–62°N. Based on macroscopic staging of gonads (N ∼62000) collected in 2004–2021, we detected an on-going extension of spawning activities into the Norwegian Sea feeding area (62–75°N), reaching stable levels around 2012 onwards. This poleward expansion increased as more fish entered the area, whilst the maximum proportions of spawners concurrently dropped from about 75 to 15% from May to July. Detailed histological examinations in 2018 confirmed the macroscopic results but clarified that 38% of the spawning-capable females in July terminated their spawning by atresia. We suggest that increased access to suitable spawning areas (≥10°C), following ocean warming from 2002 onwards, functions as a proximate cause behind the noticed expansion, whereas the ultimate trigger was the historic drop in body growth and condition about 10 years later. Driven by these energetic constraints, mackerel likely spawn in the direction of high prey concentrations to rebuild body resources and secure the future rather than current reproduction success. The ambient temperature that far north is considered suboptimal for egg and larval survival. |
author2 |
Bartolino, Valerio Norwegian Fisheries Research Sale Tax System Institute of Marine Research Norwegian Research Council |
format |
Article in Journal/Newspaper |
author |
dos Santos Schmidt, T C Slotte, A Olafsdottir, A H Nøttestad, L Jansen, T Jacobsen, J A Bjarnason, S Lusseau, S M Ono, K Hølleland, S Thorsen, A Sandø, A B Kjesbu, O S |
spellingShingle |
dos Santos Schmidt, T C Slotte, A Olafsdottir, A H Nøttestad, L Jansen, T Jacobsen, J A Bjarnason, S Lusseau, S M Ono, K Hølleland, S Thorsen, A Sandø, A B Kjesbu, O S Poleward spawning of Atlantic mackerel ( Scomber scombrus) is facilitated by ocean warming but triggered by energetic constraints |
author_facet |
dos Santos Schmidt, T C Slotte, A Olafsdottir, A H Nøttestad, L Jansen, T Jacobsen, J A Bjarnason, S Lusseau, S M Ono, K Hølleland, S Thorsen, A Sandø, A B Kjesbu, O S |
author_sort |
dos Santos Schmidt, T C |
title |
Poleward spawning of Atlantic mackerel ( Scomber scombrus) is facilitated by ocean warming but triggered by energetic constraints |
title_short |
Poleward spawning of Atlantic mackerel ( Scomber scombrus) is facilitated by ocean warming but triggered by energetic constraints |
title_full |
Poleward spawning of Atlantic mackerel ( Scomber scombrus) is facilitated by ocean warming but triggered by energetic constraints |
title_fullStr |
Poleward spawning of Atlantic mackerel ( Scomber scombrus) is facilitated by ocean warming but triggered by energetic constraints |
title_full_unstemmed |
Poleward spawning of Atlantic mackerel ( Scomber scombrus) is facilitated by ocean warming but triggered by energetic constraints |
title_sort |
poleward spawning of atlantic mackerel ( scomber scombrus) is facilitated by ocean warming but triggered by energetic constraints |
publisher |
Oxford University Press (OUP) |
publishDate |
2023 |
url |
http://dx.doi.org/10.1093/icesjms/fsad098 https://academic.oup.com/icesjms/article-pdf/81/3/600/57332230/fsad098.pdf |
genre |
Northeast Atlantic Norwegian Sea |
genre_facet |
Northeast Atlantic Norwegian Sea |
op_source |
ICES Journal of Marine Science volume 81, issue 3, page 600-615 ISSN 1054-3139 1095-9289 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/icesjms/fsad098 |
container_title |
ICES Journal of Marine Science |
_version_ |
1810465921040384000 |