Multi-decadal trends in biomarkers in harp seal teeth from the North Atlantic reveal the influence of prey availability on seal trophic position
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...
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| Veröffentlicht in: | Global change biology 2023-10, Vol.29 (19), p.5582-5595 |
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| creator | 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 |
| description | 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
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
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. |
| doi_str_mv | 10.1111/gcb.16889 |
| format | Article |
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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
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.</abstract><cop>England</cop><pub>Blackwell Publishing Ltd</pub><pmid>37477068</pmid><doi>10.1111/gcb.16889</doi><tpages>14</tpages><orcidid>https://orcid.org/0000-0003-2244-3198</orcidid><orcidid>https://orcid.org/0000-0002-7302-7306</orcidid><orcidid>https://orcid.org/0000-0001-6114-2334</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Amino acids Aquatic mammals Availability Biomarkers Ecotoxicology Environmental changes Fish Food chains Food webs Isotopes Marine mammals Nitrogen isotopes Pagophilus groenlandicus Polar environments Population studies Position measurement Predators Prey Seals Seals (animals) Teeth Trends |
| title | Multi-decadal trends in biomarkers in harp seal teeth from the North Atlantic reveal the influence of prey availability on seal trophic position |
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