Carbon and Nitrogen Isoscapes in West Antarctica Reflect Oceanographic Transitions
Antarctic marine ecosystems are spatially and temporally dynamic. Regional climate change is significantly altering the patterns and magnitudes of this dynamism with cascading impacts on biogeochemistry, productivity, and food web architecture. Isoscapes (or isotopic maps) provide a valuable analyti...
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ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-1309 2024-09-15T17:48:42+00:00 Carbon and Nitrogen Isoscapes in West Antarctica Reflect Oceanographic Transitions Brault, Emily K. Koch, Paul L. McMahon, Kelton W. Broach, Kyle H. Rosenfield, Aaron P. Sauthoff, Wilson Loeb, Valerie J. Arrigo, Kevin R. Smith, Walker O., Jr. 2018-01-01T08:00:00Z application/pdf https://digitalcommons.uri.edu/gsofacpubs/293 https://doi.org/10.3354/meps12524 https://digitalcommons.uri.edu/context/gsofacpubs/article/1309/viewcontent/McMahon_CarbonNitrogen_2018.pdf unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/293 doi:10.3354/meps12524 https://digitalcommons.uri.edu/context/gsofacpubs/article/1309/viewcontent/McMahon_CarbonNitrogen_2018.pdf Graduate School of Oceanography Faculty Publications text 2018 ftunivrhodeislan https://doi.org/10.3354/meps12524 2024-08-21T00:09:33Z Antarctic marine ecosystems are spatially and temporally dynamic. Regional climate change is significantly altering the patterns and magnitudes of this dynamism with cascading impacts on biogeochemistry, productivity, and food web architecture. Isoscapes (or isotopic maps) provide a valuable analytical framework to characterize ecosystem processes and address questions about trophic dynamics, animal movement, and elemental cycling. Applications of stable isotope methods to Antarctic ecosystems are currently limited by a paucity of information on geospatial isotope characteristics within the Southern Ocean. In response, we have created the first empirically derived zooplankton isoscapes for West Antarctica based on analysis of bulk nitrogen and carbon isotope values (δ15N and δ13C) in 94 zooplankton specimens from the Drake Passage, West Antarctic Peninsula (WAP), and Amundsen and Ross Seas. The zooplankton δ15N values increased by 3‰ from north of the Polar Front (3.3 ± 0.6‰, mean ± SD) to the Ross Sea (6.2 ± 0.8‰), reflecting a productivity gradient across this region. Abundant open water polynyas in the Amundsen and Ross Seas exhibit strong nitrate drawdown, resulting in more 15N-enriched phytoplankton and zooplankton relative to those from the generally less productive WAP and Drake Passage. Zooplankton δ13C values decreased by 3‰ from north of the Polar Front (-24.2 ± 0.9‰) to the Ross Sea (-27.5 ± 1.6‰), likely driven by decreasing sea surface temperatures with increasing latitude. Our isoscapes are a valuable first step in establishing isotopic spatial patterns in West Antarctica and are critical for addressing numerous ecosystem questions. Text Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage Ross Sea Southern Ocean West Antarctica University of Rhode Island: DigitalCommons@URI Marine Ecology Progress Series 593 29 45 |
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University of Rhode Island: DigitalCommons@URI |
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ftunivrhodeislan |
language |
unknown |
description |
Antarctic marine ecosystems are spatially and temporally dynamic. Regional climate change is significantly altering the patterns and magnitudes of this dynamism with cascading impacts on biogeochemistry, productivity, and food web architecture. Isoscapes (or isotopic maps) provide a valuable analytical framework to characterize ecosystem processes and address questions about trophic dynamics, animal movement, and elemental cycling. Applications of stable isotope methods to Antarctic ecosystems are currently limited by a paucity of information on geospatial isotope characteristics within the Southern Ocean. In response, we have created the first empirically derived zooplankton isoscapes for West Antarctica based on analysis of bulk nitrogen and carbon isotope values (δ15N and δ13C) in 94 zooplankton specimens from the Drake Passage, West Antarctic Peninsula (WAP), and Amundsen and Ross Seas. The zooplankton δ15N values increased by 3‰ from north of the Polar Front (3.3 ± 0.6‰, mean ± SD) to the Ross Sea (6.2 ± 0.8‰), reflecting a productivity gradient across this region. Abundant open water polynyas in the Amundsen and Ross Seas exhibit strong nitrate drawdown, resulting in more 15N-enriched phytoplankton and zooplankton relative to those from the generally less productive WAP and Drake Passage. Zooplankton δ13C values decreased by 3‰ from north of the Polar Front (-24.2 ± 0.9‰) to the Ross Sea (-27.5 ± 1.6‰), likely driven by decreasing sea surface temperatures with increasing latitude. Our isoscapes are a valuable first step in establishing isotopic spatial patterns in West Antarctica and are critical for addressing numerous ecosystem questions. |
format |
Text |
author |
Brault, Emily K. Koch, Paul L. McMahon, Kelton W. Broach, Kyle H. Rosenfield, Aaron P. Sauthoff, Wilson Loeb, Valerie J. Arrigo, Kevin R. Smith, Walker O., Jr. |
spellingShingle |
Brault, Emily K. Koch, Paul L. McMahon, Kelton W. Broach, Kyle H. Rosenfield, Aaron P. Sauthoff, Wilson Loeb, Valerie J. Arrigo, Kevin R. Smith, Walker O., Jr. Carbon and Nitrogen Isoscapes in West Antarctica Reflect Oceanographic Transitions |
author_facet |
Brault, Emily K. Koch, Paul L. McMahon, Kelton W. Broach, Kyle H. Rosenfield, Aaron P. Sauthoff, Wilson Loeb, Valerie J. Arrigo, Kevin R. Smith, Walker O., Jr. |
author_sort |
Brault, Emily K. |
title |
Carbon and Nitrogen Isoscapes in West Antarctica Reflect Oceanographic Transitions |
title_short |
Carbon and Nitrogen Isoscapes in West Antarctica Reflect Oceanographic Transitions |
title_full |
Carbon and Nitrogen Isoscapes in West Antarctica Reflect Oceanographic Transitions |
title_fullStr |
Carbon and Nitrogen Isoscapes in West Antarctica Reflect Oceanographic Transitions |
title_full_unstemmed |
Carbon and Nitrogen Isoscapes in West Antarctica Reflect Oceanographic Transitions |
title_sort |
carbon and nitrogen isoscapes in west antarctica reflect oceanographic transitions |
publisher |
DigitalCommons@URI |
publishDate |
2018 |
url |
https://digitalcommons.uri.edu/gsofacpubs/293 https://doi.org/10.3354/meps12524 https://digitalcommons.uri.edu/context/gsofacpubs/article/1309/viewcontent/McMahon_CarbonNitrogen_2018.pdf |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage Ross Sea Southern Ocean West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Drake Passage Ross Sea Southern Ocean West Antarctica |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/293 doi:10.3354/meps12524 https://digitalcommons.uri.edu/context/gsofacpubs/article/1309/viewcontent/McMahon_CarbonNitrogen_2018.pdf |
op_doi |
https://doi.org/10.3354/meps12524 |
container_title |
Marine Ecology Progress Series |
container_volume |
593 |
container_start_page |
29 |
op_container_end_page |
45 |
_version_ |
1810290218082762752 |