Marine mammal consumption and fisheries removals in the Nordic and Barents Seas
Abstract In this study, we assess prey consumption by the marine mammal community in the northeast Atlantic [including 21 taxa, across three regions: (I) the Icelandic shelf, Denmark Strait, and Iceland Sea (ICE); (II) the Greenland and Norwegian Seas (GN); and (III) the Barents Sea (BS)], and compa...
Published in: | ICES Journal of Marine Science |
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2022
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Online Access: | http://dx.doi.org/10.1093/icesjms/fsac096 https://academic.oup.com/icesjms/article-pdf/79/5/1583/44278866/fsac096.pdf |
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croxfordunivpr:10.1093/icesjms/fsac096 2024-09-15T17:57:58+00:00 Marine mammal consumption and fisheries removals in the Nordic and Barents Seas Skern-Mauritzen, Mette Lindstrøm, Ulf Biuw, Martin Elvarsson, Bjarki Gunnlaugsson, Thorvaldur Haug, Tore Kovacs, Kit M Lydersen, Christian McBride, Margaret M Mikkelsen, Bjarni Øien, Nils Víkingsson, Gísli Northridge, Simon 2022 http://dx.doi.org/10.1093/icesjms/fsac096 https://academic.oup.com/icesjms/article-pdf/79/5/1583/44278866/fsac096.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ ICES Journal of Marine Science volume 79, issue 5, page 1583-1603 ISSN 1054-3139 1095-9289 journal-article 2022 croxfordunivpr https://doi.org/10.1093/icesjms/fsac096 2024-08-12T04:24:15Z Abstract In this study, we assess prey consumption by the marine mammal community in the northeast Atlantic [including 21 taxa, across three regions: (I) the Icelandic shelf, Denmark Strait, and Iceland Sea (ICE); (II) the Greenland and Norwegian Seas (GN); and (III) the Barents Sea (BS)], and compare mammal requirements with removals by fisheries. To determine prey needs, estimates of energetic requirements were combined with diet and abundance information for parameterizing simple allometric scaling models, taking uncertainties into account through bootstrapping procedures. In total, marine mammals in the ICE, GN, and BS consumed 13.4 [Confidence Interval (CI): 5.6–25.0], 4.6 (CI: 1.9–8.6), and 7.1 (CI: 2.8–13.8) million tonnes of prey year–1. Fisheries removed 1.55, 1.45, and 1.16 million tonnes year–1 from these three areas, respectively. While fisheries generally operate at significantly higher trophic levels than marine mammals, we find that the potential for direct competition between marine mammals and fisheries is strongest in the GN and weakest in the BS. Furthermore, our results also demonstrate significant changes in mammal consumption compared to previous and more focused studies over the last decades. These changes likely reflect both ongoing population recoveries from historic whaling and the current rapid physical and biological changes of these high-latitude systems. We argue that changing distributions and abundances of mammals should be considered when establishing fisheries harvesting strategies, to ensure effective fisheries management and good conservation practices of top predators in such rapidly changing systems. Article in Journal/Newspaper Barents Sea Denmark Strait Greenland Iceland Northeast Atlantic Sea ice Oxford University Press ICES Journal of Marine Science 79 5 1583 1603 |
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Oxford University Press |
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croxfordunivpr |
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English |
description |
Abstract In this study, we assess prey consumption by the marine mammal community in the northeast Atlantic [including 21 taxa, across three regions: (I) the Icelandic shelf, Denmark Strait, and Iceland Sea (ICE); (II) the Greenland and Norwegian Seas (GN); and (III) the Barents Sea (BS)], and compare mammal requirements with removals by fisheries. To determine prey needs, estimates of energetic requirements were combined with diet and abundance information for parameterizing simple allometric scaling models, taking uncertainties into account through bootstrapping procedures. In total, marine mammals in the ICE, GN, and BS consumed 13.4 [Confidence Interval (CI): 5.6–25.0], 4.6 (CI: 1.9–8.6), and 7.1 (CI: 2.8–13.8) million tonnes of prey year–1. Fisheries removed 1.55, 1.45, and 1.16 million tonnes year–1 from these three areas, respectively. While fisheries generally operate at significantly higher trophic levels than marine mammals, we find that the potential for direct competition between marine mammals and fisheries is strongest in the GN and weakest in the BS. Furthermore, our results also demonstrate significant changes in mammal consumption compared to previous and more focused studies over the last decades. These changes likely reflect both ongoing population recoveries from historic whaling and the current rapid physical and biological changes of these high-latitude systems. We argue that changing distributions and abundances of mammals should be considered when establishing fisheries harvesting strategies, to ensure effective fisheries management and good conservation practices of top predators in such rapidly changing systems. |
author2 |
Northridge, Simon |
format |
Article in Journal/Newspaper |
author |
Skern-Mauritzen, Mette Lindstrøm, Ulf Biuw, Martin Elvarsson, Bjarki Gunnlaugsson, Thorvaldur Haug, Tore Kovacs, Kit M Lydersen, Christian McBride, Margaret M Mikkelsen, Bjarni Øien, Nils Víkingsson, Gísli |
spellingShingle |
Skern-Mauritzen, Mette Lindstrøm, Ulf Biuw, Martin Elvarsson, Bjarki Gunnlaugsson, Thorvaldur Haug, Tore Kovacs, Kit M Lydersen, Christian McBride, Margaret M Mikkelsen, Bjarni Øien, Nils Víkingsson, Gísli Marine mammal consumption and fisheries removals in the Nordic and Barents Seas |
author_facet |
Skern-Mauritzen, Mette Lindstrøm, Ulf Biuw, Martin Elvarsson, Bjarki Gunnlaugsson, Thorvaldur Haug, Tore Kovacs, Kit M Lydersen, Christian McBride, Margaret M Mikkelsen, Bjarni Øien, Nils Víkingsson, Gísli |
author_sort |
Skern-Mauritzen, Mette |
title |
Marine mammal consumption and fisheries removals in the Nordic and Barents Seas |
title_short |
Marine mammal consumption and fisheries removals in the Nordic and Barents Seas |
title_full |
Marine mammal consumption and fisheries removals in the Nordic and Barents Seas |
title_fullStr |
Marine mammal consumption and fisheries removals in the Nordic and Barents Seas |
title_full_unstemmed |
Marine mammal consumption and fisheries removals in the Nordic and Barents Seas |
title_sort |
marine mammal consumption and fisheries removals in the nordic and barents seas |
publisher |
Oxford University Press (OUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1093/icesjms/fsac096 https://academic.oup.com/icesjms/article-pdf/79/5/1583/44278866/fsac096.pdf |
genre |
Barents Sea Denmark Strait Greenland Iceland Northeast Atlantic Sea ice |
genre_facet |
Barents Sea Denmark Strait Greenland Iceland Northeast Atlantic Sea ice |
op_source |
ICES Journal of Marine Science volume 79, issue 5, page 1583-1603 ISSN 1054-3139 1095-9289 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/icesjms/fsac096 |
container_title |
ICES Journal of Marine Science |
container_volume |
79 |
container_issue |
5 |
container_start_page |
1583 |
op_container_end_page |
1603 |
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1810434190695464960 |