Multi‐decadal trends in biomarkers in harp seal teeth from the North Atlantic reveal the influence of prey availability on seal trophic position
Abstract Arctic food webs are being impacted by borealisation and environmental change. To quantify the impact of these multiple forcings, it is crucial to accurately determine the temporal change in key ecosystem metrics, such as trophic position of top predators. Here, we measured stable nitrogen...
Published in: | Global Change Biology |
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Online Access: | http://dx.doi.org/10.1111/gcb.16889 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.16889 |
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crwiley:10.1111/gcb.16889 2024-06-02T08:02:13+00:00 Multi‐decadal trends in biomarkers in harp seal teeth from the North Atlantic reveal the influence of prey availability on seal trophic position de la Vega, Camille Kershaw, Joanna Stenson, Garry B. Frie, Anne Kirstine Biuw, Martin Haug, Tore Norman, Louisa Mahaffey, Claire Smout, Sophie Jeffreys, Rachel M. Natural Environment Research Council 2023 http://dx.doi.org/10.1111/gcb.16889 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.16889 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Global Change Biology volume 29, issue 19, page 5582-5595 ISSN 1354-1013 1365-2486 journal-article 2023 crwiley https://doi.org/10.1111/gcb.16889 2024-05-03T11:42:34Z Abstract Arctic food webs are being impacted by borealisation and environmental change. To quantify the impact of these multiple forcings, it is crucial to accurately determine the temporal change in key ecosystem metrics, such as trophic position of top predators. Here, we measured stable nitrogen isotopes (δ 15 N) in amino acids in harp seal teeth from across the North Atlantic spanning a period of 60 years to robustly assess multi‐decadal trends in harp seal trophic position, accounting for changes in δ 15 N at the base of the food web. We reveal long‐term variations in trophic position of harp seals which are likely to reflect fluctuations in prey availability, specifically fish‐ or invertebrate‐dominated diets. We show that the temporal trends in harp seal trophic position differ between the Northwest Atlantic, Greenland Sea and Barents Sea, suggesting divergent changes in each local ecosystem. Our results provide invaluable data for population dynamic and ecotoxicology studies. Article in Journal/Newspaper Arctic Barents Sea Greenland Greenland Sea Harp Seal North Atlantic Northwest Atlantic Wiley Online Library Arctic Barents Sea Greenland Global Change Biology 29 19 5582 5595 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Arctic food webs are being impacted by borealisation and environmental change. To quantify the impact of these multiple forcings, it is crucial to accurately determine the temporal change in key ecosystem metrics, such as trophic position of top predators. Here, we measured stable nitrogen isotopes (δ 15 N) in amino acids in harp seal teeth from across the North Atlantic spanning a period of 60 years to robustly assess multi‐decadal trends in harp seal trophic position, accounting for changes in δ 15 N at the base of the food web. We reveal long‐term variations in trophic position of harp seals which are likely to reflect fluctuations in prey availability, specifically fish‐ or invertebrate‐dominated diets. We show that the temporal trends in harp seal trophic position differ between the Northwest Atlantic, Greenland Sea and Barents Sea, suggesting divergent changes in each local ecosystem. Our results provide invaluable data for population dynamic and ecotoxicology studies. |
author2 |
Natural Environment Research Council |
format |
Article in Journal/Newspaper |
author |
de la Vega, Camille Kershaw, Joanna Stenson, Garry B. Frie, Anne Kirstine Biuw, Martin Haug, Tore Norman, Louisa Mahaffey, Claire Smout, Sophie Jeffreys, Rachel M. |
spellingShingle |
de la Vega, Camille Kershaw, Joanna Stenson, Garry B. Frie, Anne Kirstine Biuw, Martin Haug, Tore Norman, Louisa Mahaffey, Claire Smout, Sophie Jeffreys, Rachel M. Multi‐decadal trends in biomarkers in harp seal teeth from the North Atlantic reveal the influence of prey availability on seal trophic position |
author_facet |
de la Vega, Camille Kershaw, Joanna Stenson, Garry B. Frie, Anne Kirstine Biuw, Martin Haug, Tore Norman, Louisa Mahaffey, Claire Smout, Sophie Jeffreys, Rachel M. |
author_sort |
de la Vega, Camille |
title |
Multi‐decadal trends in biomarkers in harp seal teeth from the North Atlantic reveal the influence of prey availability on seal trophic position |
title_short |
Multi‐decadal trends in biomarkers in harp seal teeth from the North Atlantic reveal the influence of prey availability on seal trophic position |
title_full |
Multi‐decadal trends in biomarkers in harp seal teeth from the North Atlantic reveal the influence of prey availability on seal trophic position |
title_fullStr |
Multi‐decadal trends in biomarkers in harp seal teeth from the North Atlantic reveal the influence of prey availability on seal trophic position |
title_full_unstemmed |
Multi‐decadal trends in biomarkers in harp seal teeth from the North Atlantic reveal the influence of prey availability on seal trophic position |
title_sort |
multi‐decadal trends in biomarkers in harp seal teeth from the north atlantic reveal the influence of prey availability on seal trophic position |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/gcb.16889 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.16889 |
geographic |
Arctic Barents Sea Greenland |
geographic_facet |
Arctic Barents Sea Greenland |
genre |
Arctic Barents Sea Greenland Greenland Sea Harp Seal North Atlantic Northwest Atlantic |
genre_facet |
Arctic Barents Sea Greenland Greenland Sea Harp Seal North Atlantic Northwest Atlantic |
op_source |
Global Change Biology volume 29, issue 19, page 5582-5595 ISSN 1354-1013 1365-2486 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/gcb.16889 |
container_title |
Global Change Biology |
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29 |
container_issue |
19 |
container_start_page |
5582 |
op_container_end_page |
5595 |
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1800746708358922240 |