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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Isoscape Models of the Southern Ocean: Predicting Spatial and Temporal Variability in Carbon and Nitrogen Isotope Compositions of Particulate Organic Matter
Global Biogeochemical Cycles, Volume 35, No. 9, Article e2020GB006901, Year 2021
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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. © 2021. The Authors.
Authors & Co-Authors
St John Glew, Katie
United Kingdom, Southampton
National Oceanography Centre Southampton
Espinasse, Boris D.
Norway, Tromso
Uit Norges Arktiske Universitet
Hunt, Brian P.V.
Canada, Vancouver
The University of British Columbia
Pakhomov, Evgeny A.
Canada, Vancouver
The University of British Columbia
Bury, Sarah Jane
New Zealand, Auckland
National Institute of Water and Atmospheric Research
Graham, Laura J.
United Kingdom, Birmingham
University of Birmingham
Austria, Laxenburg
International Institute for Applied Systems Analysis, Laxenburg
Dunbar, Robert B.
United States, Palo Alto
Stanford University
Magozzi, Sarah
Italy, Naples
Stazione Zoologica Anton Dohrn
Somes, Christopher J.
Germany, Kiel
Geomar - Helmholtz-zentrum Für Ozeanforschung Kiel
Trueman, Clive N.G.
United Kingdom, Southampton
National Oceanography Centre Southampton
Statistics
Citations: 14
Authors: 10
Affiliations: 9
Identifiers
Doi:
10.1029/2020GB006901
ISSN:
08866236
Research Areas
Environmental
Food Security