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Stable nitrogen isotopes (\u03b4<jats:sup>15<\/jats:sup>N) can be used to detect and unravel the impact of these forcings on this unique ecosystem, if the many processes that affect the \u03b4<jats:sup>15<\/jats:sup>N values are constrained. Combining unique 60\u2010year records from compound specific \u03b4<jats:sup>15<\/jats:sup>N biomarkers on harp seal teeth alongside state\u2010of\u2010the\u2010art ocean modelling, we observed a significant decline in the \u03b4<jats:sup>15<\/jats:sup>N values at the base of the Barents Sea food web from 1951 to 2012. This strong and persistent decadal trend emerges due to the combination of anthropogenic atmospheric nitrogen deposition in the Atlantic, increased northward transport of Atlantic water through Arctic gateways and local feedbacks from increasing Arctic primary production. Our results suggest that the Arctic ecosystem has been responding to anthropogenically induced local and remote drivers, linked to changing ocean biology, chemistry and physics, for at least 60\u00a0years. Accounting for these trends in \u03b4<jats:sup>15<\/jats:sup>N values at the base of the food web is essential to accurately detect ecosystem restructuring in this rapidly changing environment.<\/jats:p>","DOI":"10.1111\/gcb.16138","type":"journal-article","created":{"date-parts":[[2022,2,24]],"date-time":"2022-02-24T17:33:35Z","timestamp":1645724015000},"page":"3054-3065","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Multi\u2010decadal environmental change in the Barents Sea recorded by seal teeth"],"prefix":"10.1111","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7302-7306","authenticated-orcid":false,"given":"Camille","family":"de la Vega","sequence":"first","affiliation":[{"name":"School of Environmental Sciences University of Liverpool  Liverpool UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pearse J.","family":"Buchanan","sequence":"additional","affiliation":[{"name":"School of Environmental Sciences University of Liverpool  Liverpool UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alessandro","family":"Tagliabue","sequence":"additional","affiliation":[{"name":"School of Environmental Sciences University of Liverpool  Liverpool UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joanne E.","family":"Hopkins","sequence":"additional","affiliation":[{"name":"National Oceanography Centre  Liverpool UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rachel M.","family":"Jeffreys","sequence":"additional","affiliation":[{"name":"School of Environmental Sciences University of Liverpool  Liverpool UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anne Kirstine","family":"Frie","sequence":"additional","affiliation":[{"name":"Institute of Marine Research Fram Centre  Troms\u00f8 Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martin","family":"Biuw","sequence":"additional","affiliation":[{"name":"Institute of Marine Research Fram Centre  Troms\u00f8 Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2244-3198","authenticated-orcid":false,"given":"Joanna","family":"Kershaw","sequence":"additional","affiliation":[{"name":"Sea Mammal Research Unit Scottish Oceans Institute University of St Andrews  St Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"James","family":"Grecian","sequence":"additional","affiliation":[{"name":"Sea Mammal Research Unit Scottish Oceans Institute University of St Andrews  St Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Louisa","family":"Norman","sequence":"additional","affiliation":[{"name":"School of Environmental Sciences University of Liverpool  Liverpool UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sophie","family":"Smout","sequence":"additional","affiliation":[{"name":"Sea Mammal Research Unit Scottish Oceans Institute University of St Andrews  St Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tore","family":"Haug","sequence":"additional","affiliation":[{"name":"Institute of Marine Research Fram Centre  Troms\u00f8 Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claire","family":"Mahaffey","sequence":"additional","affiliation":[{"name":"School of Environmental Sciences University of Liverpool  Liverpool UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,3]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1516847113"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41558\u2010020\u20100905\u2010y"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1175\/JCLI\u2010D\u201011\u201000466.1"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.5194\/gmd\u20108\u20102465\u20102015"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1139\/f83\u2010165"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/ele.12481"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467\u2010021\u201026552\u2010w"},{"key":"e_1_2_8_9_1","unstructured":"Buchanan P. 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