Isoscape Models of the Southern Ocean: Predicting Spatial and Temporal Variability in Carbon and Nitrogen Isotope Compositions of Particulate Organic Matter
Polar marine ecosystems are particularly vulnerable to the effects of climate change. Warming temperatures, freshening seawater, and disruption to sea-ice formation potentially all have cascading effects on food webs. New approaches are needed to better understand spatiotemporal interactions among b...
Published in: | Global Biogeochemical Cycles |
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Format: | Article in Journal/Newspaper |
Language: | English |
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American Geophysical Union (AGU)
2021
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Online Access: | https://archimer.ifremer.fr/doc/00722/83389/88362.pdf https://doi.org/10.1029/2020GB006901 https://archimer.ifremer.fr/doc/00722/83389/ |
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ftarchimer:oai:archimer.ifremer.fr:83389 2023-05-15T18:18:36+02:00 Isoscape Models of the Southern Ocean: Predicting Spatial and Temporal Variability in Carbon and Nitrogen Isotope Compositions of Particulate Organic Matter St John Glew, Katie Espinasse, Boris Hunt, Brian P. V. Pakhomov, Evgeny A. Bury, Sarah J. Pinkerton, Matt Nodder, Scott D. Gutiérrez‐rodríguez, Andres Safi, Karl Brown, Julie C. S. Graham, Laura Dunbar, Robert B. Mucciarone, David A. Magozzi, Sarah Somes, Chris Trueman, Clive N. 2021-09 application/pdf https://archimer.ifremer.fr/doc/00722/83389/88362.pdf https://doi.org/10.1029/2020GB006901 https://archimer.ifremer.fr/doc/00722/83389/ eng eng American Geophysical Union (AGU) info:eu-repo/grantAgreement/EC/H2020/894296/EU//ISOMOD info:eu-repo/grantAgreement/EC/FP7/302010/EU//ISOZOO https://archimer.ifremer.fr/doc/00722/83389/88362.pdf doi:10.1029/2020GB006901 https://archimer.ifremer.fr/doc/00722/83389/ info:eu-repo/semantics/openAccess restricted use Global Biogeochemical Cycles (0886-6236) (American Geophysical Union (AGU)), 2021-09 , Vol. 35 , N. 9 , P. e2020GB006901 (18p.) stable isotopes delta C-13 and delta N-15 POM Bayesian spatial modeling migration pathways trophic baseline text Publication info:eu-repo/semantics/article 2021 ftarchimer https://doi.org/10.1029/2020GB006901 2023-02-15T00:23:12Z Polar marine ecosystems are particularly vulnerable to the effects of climate change. Warming temperatures, freshening seawater, and disruption to sea-ice formation potentially all have cascading effects on food webs. New approaches are needed to better understand spatiotemporal interactions among biogeochemical processes at the base of Southern Ocean food webs. In marine systems, isoscapes (models of the spatial variation in the stable isotopic composition) of carbon and nitrogen have proven useful in identifying spatial variation in a range of biogeochemical processes, such as nutrient utilization by phytoplankton. Isoscapes provide a baseline for interpreting stable isotope compositions of higher trophic level animals in movement, migration, and diet research. Here, we produce carbon and nitrogen isoscapes across the entire Southern Ocean (>40°S) using surface particulate organic matter isotope data, collected over the past 50 years. We use Integrated Nested Laplace Approximation-based approaches to predict mean annual isoscapes and four seasonal isoscapes using a suite of environmental data as predictor variables. Clear spatial gradients in δ13C and δ15N values were predicted across the Southern Ocean, consistent with previous statistical and mechanistic views of isotopic variability in this region. We identify strong seasonal variability in both carbon and nitrogen isoscapes, with key implications for the use of static or annual average isoscape baselines in animal studies attempting to document seasonal migratory or foraging behaviors. Article in Journal/Newspaper Sea ice Southern Ocean Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Laplace ENVELOPE(141.467,141.467,-66.782,-66.782) Southern Ocean Global Biogeochemical Cycles 35 9 |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
topic |
stable isotopes delta C-13 and delta N-15 POM Bayesian spatial modeling migration pathways trophic baseline |
spellingShingle |
stable isotopes delta C-13 and delta N-15 POM Bayesian spatial modeling migration pathways trophic baseline St John Glew, Katie Espinasse, Boris Hunt, Brian P. V. Pakhomov, Evgeny A. Bury, Sarah J. Pinkerton, Matt Nodder, Scott D. Gutiérrez‐rodríguez, Andres Safi, Karl Brown, Julie C. S. Graham, Laura Dunbar, Robert B. Mucciarone, David A. Magozzi, Sarah Somes, Chris Trueman, Clive N. Isoscape Models of the Southern Ocean: Predicting Spatial and Temporal Variability in Carbon and Nitrogen Isotope Compositions of Particulate Organic Matter |
topic_facet |
stable isotopes delta C-13 and delta N-15 POM Bayesian spatial modeling migration pathways trophic baseline |
description |
Polar marine ecosystems are particularly vulnerable to the effects of climate change. Warming temperatures, freshening seawater, and disruption to sea-ice formation potentially all have cascading effects on food webs. New approaches are needed to better understand spatiotemporal interactions among biogeochemical processes at the base of Southern Ocean food webs. In marine systems, isoscapes (models of the spatial variation in the stable isotopic composition) of carbon and nitrogen have proven useful in identifying spatial variation in a range of biogeochemical processes, such as nutrient utilization by phytoplankton. Isoscapes provide a baseline for interpreting stable isotope compositions of higher trophic level animals in movement, migration, and diet research. Here, we produce carbon and nitrogen isoscapes across the entire Southern Ocean (>40°S) using surface particulate organic matter isotope data, collected over the past 50 years. We use Integrated Nested Laplace Approximation-based approaches to predict mean annual isoscapes and four seasonal isoscapes using a suite of environmental data as predictor variables. Clear spatial gradients in δ13C and δ15N values were predicted across the Southern Ocean, consistent with previous statistical and mechanistic views of isotopic variability in this region. We identify strong seasonal variability in both carbon and nitrogen isoscapes, with key implications for the use of static or annual average isoscape baselines in animal studies attempting to document seasonal migratory or foraging behaviors. |
format |
Article in Journal/Newspaper |
author |
St John Glew, Katie Espinasse, Boris Hunt, Brian P. V. Pakhomov, Evgeny A. Bury, Sarah J. Pinkerton, Matt Nodder, Scott D. Gutiérrez‐rodríguez, Andres Safi, Karl Brown, Julie C. S. Graham, Laura Dunbar, Robert B. Mucciarone, David A. Magozzi, Sarah Somes, Chris Trueman, Clive N. |
author_facet |
St John Glew, Katie Espinasse, Boris Hunt, Brian P. V. Pakhomov, Evgeny A. Bury, Sarah J. Pinkerton, Matt Nodder, Scott D. Gutiérrez‐rodríguez, Andres Safi, Karl Brown, Julie C. S. Graham, Laura Dunbar, Robert B. Mucciarone, David A. Magozzi, Sarah Somes, Chris Trueman, Clive N. |
author_sort |
St John Glew, Katie |
title |
Isoscape Models of the Southern Ocean: Predicting Spatial and Temporal Variability in Carbon and Nitrogen Isotope Compositions of Particulate Organic Matter |
title_short |
Isoscape Models of the Southern Ocean: Predicting Spatial and Temporal Variability in Carbon and Nitrogen Isotope Compositions of Particulate Organic Matter |
title_full |
Isoscape Models of the Southern Ocean: Predicting Spatial and Temporal Variability in Carbon and Nitrogen Isotope Compositions of Particulate Organic Matter |
title_fullStr |
Isoscape Models of the Southern Ocean: Predicting Spatial and Temporal Variability in Carbon and Nitrogen Isotope Compositions of Particulate Organic Matter |
title_full_unstemmed |
Isoscape Models of the Southern Ocean: Predicting Spatial and Temporal Variability in Carbon and Nitrogen Isotope Compositions of Particulate Organic Matter |
title_sort |
isoscape models of the southern ocean: predicting spatial and temporal variability in carbon and nitrogen isotope compositions of particulate organic matter |
publisher |
American Geophysical Union (AGU) |
publishDate |
2021 |
url |
https://archimer.ifremer.fr/doc/00722/83389/88362.pdf https://doi.org/10.1029/2020GB006901 https://archimer.ifremer.fr/doc/00722/83389/ |
long_lat |
ENVELOPE(141.467,141.467,-66.782,-66.782) |
geographic |
Laplace Southern Ocean |
geographic_facet |
Laplace Southern Ocean |
genre |
Sea ice Southern Ocean |
genre_facet |
Sea ice Southern Ocean |
op_source |
Global Biogeochemical Cycles (0886-6236) (American Geophysical Union (AGU)), 2021-09 , Vol. 35 , N. 9 , P. e2020GB006901 (18p.) |
op_relation |
info:eu-repo/grantAgreement/EC/H2020/894296/EU//ISOMOD info:eu-repo/grantAgreement/EC/FP7/302010/EU//ISOZOO https://archimer.ifremer.fr/doc/00722/83389/88362.pdf doi:10.1029/2020GB006901 https://archimer.ifremer.fr/doc/00722/83389/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1029/2020GB006901 |
container_title |
Global Biogeochemical Cycles |
container_volume |
35 |
container_issue |
9 |
_version_ |
1766195229500637184 |