Multi-decadal environmental change in the Barents Sea recorded by seal teeth
Abstract
Multiple environmental forcings, such as warming and changes in ocean circulation and nutrient supply, are affecting the base of Arctic marine ecosystems, with cascading effects on the entire food web through bottom-up control. Stable nitrogen isotopes (δ15N) can be used to detect and unravel the impact of these forcings on this unique ecosystem, if the many processes that affect the δ15N values are constrained. Combining unique 60-year records from compound specific δ15N biomarkers on harp seal teeth alongside state-of-the-art ocean modelling, we observed a significant decline in the δ15N 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 years. Accounting for these trends in δ15N values at the base of the food web is essential to accurately detect ecosystem restructuring in this rapidly changing environment.
Citation
de la Vega , C , Buchanan , P J , Tagliabue , A , Hopkins , J E , Jeffreys , R M , Frie , A K , Biuw , M , Kershaw , J , Grecian , J , Norman , L , Smout , S , Haug , T & Mahaffey , C 2022 , ' Multi-decadal environmental change in the Barents Sea recorded by seal teeth ' , Global Change Biology , vol. 28 , no. 9 , pp. 3054-3065 . https://doi.org/10.1111/gcb.16138
Publication
Global Change Biology
Status
Peer reviewed
ISSN
1354-1013Type
Journal article
Rights
Copyright © 2022 The Authors. Global Change Biology published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Description
This work resulted from the ARISE project (NE/P006035/1, NE/P006000/1), part of the Changing Arctic Ocean programme, jointly funded by the UKRI Natural Environment Research Council (NERC). We thank Jim Ball for his help in the isotopic lab in Liverpool University. This work resulted from the ARISE project, part of the Changing Arctic Ocean programme.Collections
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