Multi-decadal environmental change in the Barents Sea recorded by seal teeth

Camille de la Vega*, Pearse J. Buchanan*, Alessandro Tagliabue, Joanne E. Hopkins, Rachel M. Jeffreys, Anne Kirstine Frie, Martin Biuw, Joanna Kershaw, James Grecian, Louisa Norman, Sophie Smout, Tore Haug, Claire Mahaffey

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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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.
Original languageEnglish
Pages (from-to)3054-3065
Number of pages12
JournalGlobal Change Biology
Volume28
Issue number9
Early online date1 Mar 2022
DOIs
Publication statusPublished - 1 Apr 2022

Keywords

  • Arctic
  • Atlantification
  • Atmospheric nitrogen deposition, harp seal
  • Stable nitrogen isotopes

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