Atlantic walrus signal latitudinal differences in the long-term decline of sea ice-derived carbon to benthic fauna in the Canadian Arctic
Climate change is altering the biogeochemical and physical characteristics of the Arctic marine environment, which impacts sea ice algal and phytoplankton bloom dynamics and the vertical transport of these carbon sources to benthic communities. Little is known about whether the contribution of sea i...
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ftzenodo:oai:zenodo.org:4317819 2024-09-15T18:02:12+00:00 Atlantic walrus signal latitudinal differences in the long-term decline of sea ice-derived carbon to benthic fauna in the Canadian Arctic Yurkowski, David Brown, Thomas Blanchfield, Paul Ferguson, Steve 2020-12-11 https://doi.org/10.5061/dryad.12jm63xwj unknown Zenodo https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.12jm63xwj oai:zenodo.org:4317819 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode info:eu-repo/semantics/other 2020 ftzenodo https://doi.org/10.5061/dryad.12jm63xwj 2024-07-26T20:06:53Z Climate change is altering the biogeochemical and physical characteristics of the Arctic marine environment, which impacts sea ice algal and phytoplankton bloom dynamics and the vertical transport of these carbon sources to benthic communities. Little is known about whether the contribution of sea ice-derived carbon to benthic fauna and nitrogen cycling has changed over multiple decades in concert with receding sea ice. We combined compound-specific stable isotope analysis of amino acids with highly-branched isoprenoid diatom lipid biomarkers using archived (1982-2016) tissue of benthivorous Atlantic walrus to examine temporal trends of sea ice-derived carbon, nitrogen isotope baseline and trophic position of Atlantic walrus at high- and mid-latitudes in the Canadian Arctic. Associated with an 18% sea ice decline in the mid-Arctic, sea ice-derived carbon contribution to Atlantic walrus decreased by 75% suggesting a strong decoupling of sea ice-benthic habitats. In contrast, a nearly exclusive amount of sea ice-derived carbon was maintained in high-Arctic Atlantic walrus (98% in 1996 and 89% in 2006) despite a similar percentage in sea ice reduction. Nitrogen isotope baseline or the trophic position of Atlantic walrus did not change over time at either location. These findings indicate spatial differences in the restructuring of carbon energy sources utilized by Atlantic walrus and their benthic prey and in turn, a change in Arctic marine ecosystem functioning between sea ice-pelagic-benthic habitats. Other/Unknown Material Climate change Phytoplankton Sea ice walrus* Zenodo |
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Climate change is altering the biogeochemical and physical characteristics of the Arctic marine environment, which impacts sea ice algal and phytoplankton bloom dynamics and the vertical transport of these carbon sources to benthic communities. Little is known about whether the contribution of sea ice-derived carbon to benthic fauna and nitrogen cycling has changed over multiple decades in concert with receding sea ice. We combined compound-specific stable isotope analysis of amino acids with highly-branched isoprenoid diatom lipid biomarkers using archived (1982-2016) tissue of benthivorous Atlantic walrus to examine temporal trends of sea ice-derived carbon, nitrogen isotope baseline and trophic position of Atlantic walrus at high- and mid-latitudes in the Canadian Arctic. Associated with an 18% sea ice decline in the mid-Arctic, sea ice-derived carbon contribution to Atlantic walrus decreased by 75% suggesting a strong decoupling of sea ice-benthic habitats. In contrast, a nearly exclusive amount of sea ice-derived carbon was maintained in high-Arctic Atlantic walrus (98% in 1996 and 89% in 2006) despite a similar percentage in sea ice reduction. Nitrogen isotope baseline or the trophic position of Atlantic walrus did not change over time at either location. These findings indicate spatial differences in the restructuring of carbon energy sources utilized by Atlantic walrus and their benthic prey and in turn, a change in Arctic marine ecosystem functioning between sea ice-pelagic-benthic habitats. |
format |
Other/Unknown Material |
author |
Yurkowski, David Brown, Thomas Blanchfield, Paul Ferguson, Steve |
spellingShingle |
Yurkowski, David Brown, Thomas Blanchfield, Paul Ferguson, Steve Atlantic walrus signal latitudinal differences in the long-term decline of sea ice-derived carbon to benthic fauna in the Canadian Arctic |
author_facet |
Yurkowski, David Brown, Thomas Blanchfield, Paul Ferguson, Steve |
author_sort |
Yurkowski, David |
title |
Atlantic walrus signal latitudinal differences in the long-term decline of sea ice-derived carbon to benthic fauna in the Canadian Arctic |
title_short |
Atlantic walrus signal latitudinal differences in the long-term decline of sea ice-derived carbon to benthic fauna in the Canadian Arctic |
title_full |
Atlantic walrus signal latitudinal differences in the long-term decline of sea ice-derived carbon to benthic fauna in the Canadian Arctic |
title_fullStr |
Atlantic walrus signal latitudinal differences in the long-term decline of sea ice-derived carbon to benthic fauna in the Canadian Arctic |
title_full_unstemmed |
Atlantic walrus signal latitudinal differences in the long-term decline of sea ice-derived carbon to benthic fauna in the Canadian Arctic |
title_sort |
atlantic walrus signal latitudinal differences in the long-term decline of sea ice-derived carbon to benthic fauna in the canadian arctic |
publisher |
Zenodo |
publishDate |
2020 |
url |
https://doi.org/10.5061/dryad.12jm63xwj |
genre |
Climate change Phytoplankton Sea ice walrus* |
genre_facet |
Climate change Phytoplankton Sea ice walrus* |
op_relation |
https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.12jm63xwj oai:zenodo.org:4317819 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.12jm63xwj |
_version_ |
1810439630231699456 |