Stable isotope signatures in historic harbor seal bone link food web‐assimilated carbon and nitrogen resources to a century of environmental change
Abstract Anthropogenic climate change will impact nutrient cycles, primary production, and ecosystem structure in the world's oceans, although considerable uncertainty exists regarding the magnitude and spatial variability of these changes. Understanding how regional‐scale ocean conditions cont...
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Online Access: | http://dx.doi.org/10.1111/gcb.15551 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.15551 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.15551 |
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crwiley:10.1111/gcb.15551 2024-09-15T17:59:40+00:00 Stable isotope signatures in historic harbor seal bone link food web‐assimilated carbon and nitrogen resources to a century of environmental change Feddern, Megan L. Holtgrieve, Gordon W. Ward, Eric J. Washington Sea Grant, University of Washington Joint Institute for the Study of the Atmosphere and Ocean 2021 http://dx.doi.org/10.1111/gcb.15551 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.15551 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.15551 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 27, issue 11, page 2328-2342 ISSN 1354-1013 1365-2486 journal-article 2021 crwiley https://doi.org/10.1111/gcb.15551 2024-07-04T04:28:02Z Abstract Anthropogenic climate change will impact nutrient cycles, primary production, and ecosystem structure in the world's oceans, although considerable uncertainty exists regarding the magnitude and spatial variability of these changes. Understanding how regional‐scale ocean conditions control nutrient availability and ultimately nutrient assimilation into food webs will inform how marine resources will change in response to climate. To evaluate how ocean conditions influence the assimilation of nitrogen and carbon into coastal marine food webs, we applied a novel dimension reduction analysis to a century of newly acquired molecular isotope data derived from historic harbor seal bone specimens. By measuring bulk δ 13 C and δ 15 N values of source amino acids of these top predators from 1928 to 2014, we derive indices of primary production and nitrogen resources that are assimilated into food webs. We determined coastal food webs responded to climate regimes, coastal upwelling, and freshwater discharge, yet the strength of responses to individual drivers varied across the northeast Pacific. Indices of primary production and nitrogen availability in the Gulf of Alaska were dependent on regional climate indices (i.e., North Pacific Gyre Oscillation) and upwelling. In contrast, the coastal Washington and Salish Sea food webs were associated with local indices of freshwater discharge. For some regions (eastern Bering Sea, northern Gulf of Alaska) food web‐assimilated production was coupled with nitrogen sources; however, other regions demonstrated no production‐nitrogen coupling (Salish Sea). Temporal patterns of environmental indices and isotopic data from Washington state varied about the long‐term mean with no directional trend. Data from the Gulf of Alaska, however, showed below average harbor seal δ 13 C values and above average ocean conditions since 1975, indicating a change in primary production in recent decades. Altogether, these findings demonstrate stable isotope data can provide useful indices of ... Article in Journal/Newspaper Bering Sea harbor seal Alaska Wiley Online Library Global Change Biology 27 11 2328 2342 |
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Wiley Online Library |
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English |
description |
Abstract Anthropogenic climate change will impact nutrient cycles, primary production, and ecosystem structure in the world's oceans, although considerable uncertainty exists regarding the magnitude and spatial variability of these changes. Understanding how regional‐scale ocean conditions control nutrient availability and ultimately nutrient assimilation into food webs will inform how marine resources will change in response to climate. To evaluate how ocean conditions influence the assimilation of nitrogen and carbon into coastal marine food webs, we applied a novel dimension reduction analysis to a century of newly acquired molecular isotope data derived from historic harbor seal bone specimens. By measuring bulk δ 13 C and δ 15 N values of source amino acids of these top predators from 1928 to 2014, we derive indices of primary production and nitrogen resources that are assimilated into food webs. We determined coastal food webs responded to climate regimes, coastal upwelling, and freshwater discharge, yet the strength of responses to individual drivers varied across the northeast Pacific. Indices of primary production and nitrogen availability in the Gulf of Alaska were dependent on regional climate indices (i.e., North Pacific Gyre Oscillation) and upwelling. In contrast, the coastal Washington and Salish Sea food webs were associated with local indices of freshwater discharge. For some regions (eastern Bering Sea, northern Gulf of Alaska) food web‐assimilated production was coupled with nitrogen sources; however, other regions demonstrated no production‐nitrogen coupling (Salish Sea). Temporal patterns of environmental indices and isotopic data from Washington state varied about the long‐term mean with no directional trend. Data from the Gulf of Alaska, however, showed below average harbor seal δ 13 C values and above average ocean conditions since 1975, indicating a change in primary production in recent decades. Altogether, these findings demonstrate stable isotope data can provide useful indices of ... |
author2 |
Washington Sea Grant, University of Washington Joint Institute for the Study of the Atmosphere and Ocean |
format |
Article in Journal/Newspaper |
author |
Feddern, Megan L. Holtgrieve, Gordon W. Ward, Eric J. |
spellingShingle |
Feddern, Megan L. Holtgrieve, Gordon W. Ward, Eric J. Stable isotope signatures in historic harbor seal bone link food web‐assimilated carbon and nitrogen resources to a century of environmental change |
author_facet |
Feddern, Megan L. Holtgrieve, Gordon W. Ward, Eric J. |
author_sort |
Feddern, Megan L. |
title |
Stable isotope signatures in historic harbor seal bone link food web‐assimilated carbon and nitrogen resources to a century of environmental change |
title_short |
Stable isotope signatures in historic harbor seal bone link food web‐assimilated carbon and nitrogen resources to a century of environmental change |
title_full |
Stable isotope signatures in historic harbor seal bone link food web‐assimilated carbon and nitrogen resources to a century of environmental change |
title_fullStr |
Stable isotope signatures in historic harbor seal bone link food web‐assimilated carbon and nitrogen resources to a century of environmental change |
title_full_unstemmed |
Stable isotope signatures in historic harbor seal bone link food web‐assimilated carbon and nitrogen resources to a century of environmental change |
title_sort |
stable isotope signatures in historic harbor seal bone link food web‐assimilated carbon and nitrogen resources to a century of environmental change |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1111/gcb.15551 https://onlinelibrary.wiley.com/doi/pdf/10.1111/gcb.15551 https://onlinelibrary.wiley.com/doi/full-xml/10.1111/gcb.15551 |
genre |
Bering Sea harbor seal Alaska |
genre_facet |
Bering Sea harbor seal Alaska |
op_source |
Global Change Biology volume 27, issue 11, page 2328-2342 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/gcb.15551 |
container_title |
Global Change Biology |
container_volume |
27 |
container_issue |
11 |
container_start_page |
2328 |
op_container_end_page |
2342 |
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1810436780169625600 |