Sea‐ice microbial communities in the Central Arctic Ocean: Limited responses to short‐term pCO 2 perturbations
Abstract The Arctic Ocean is more susceptible to ocean acidification than other marine environments due to its weaker buffering capacity, while its cold surface water with relatively low salinity promotes atmospheric CO 2 uptake. We studied how sea‐ice microbial communities in the central Arctic Oce...
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crwiley:10.1002/lno.11690 2024-09-15T17:53:21+00:00 Sea‐ice microbial communities in the Central Arctic Ocean: Limited responses to short‐term pCO 2 perturbations Torstensson, Anders Margolin, Andrew R. Showalter, Gordon M. Smith, Walker O. Shadwick, Elizabeth H. Carpenter, Shelly D. Bolinesi, Francesco Deming, Jody W. National Science Foundation Stiftelsen Olle Engkvist Byggmästare Vetenskapsrådet 2021 http://dx.doi.org/10.1002/lno.11690 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11690 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11690 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11690 en eng Wiley http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ Limnology and Oceanography volume 66, issue S1 ISSN 0024-3590 1939-5590 journal-article 2021 crwiley https://doi.org/10.1002/lno.11690 2024-08-27T04:25:52Z Abstract The Arctic Ocean is more susceptible to ocean acidification than other marine environments due to its weaker buffering capacity, while its cold surface water with relatively low salinity promotes atmospheric CO 2 uptake. We studied how sea‐ice microbial communities in the central Arctic Ocean may be affected by changes in the carbonate system expected as a consequence of ocean acidification. In a series of four experiments during late summer 2018 aboard the icebreaker Oden , we addressed microbial growth, production of dissolved organic carbon (DOC) and extracellular polymeric substances (EPS), photosynthetic activity, and bacterial assemblage structure as sea‐ice microbial communities were exposed to elevated partial pressures of CO 2 (pCO 2 ). We incubated intact, bottom ice‐core sections and dislodged, under‐ice algal aggregates (dominated by Melosira arctica ) in separate experiments under approximately 400, 650, 1000, and 2000 μ atm pCO 2 for 10 d under different nutrient regimes. The results indicate that the growth of sea‐ice algae and bacteria was unaffected by these higher pCO 2 levels, and concentrations of DOC and EPS were unaffected by a shifted inorganic C/N balance, resulting from the CO 2 enrichment. These central Arctic sea‐ice microbial communities thus appear to be largely insensitive to short‐term pCO 2 perturbations. Given the natural, seasonally driven fluctuations in the carbonate system of sea ice, its resident microorganisms may be sufficiently tolerant of large variations in pCO 2 and thus less vulnerable than pelagic communities to the impacts of ocean acidification, increasing the ecological importance of sea‐ice microorganisms even as the loss of Arctic sea ice continues. Article in Journal/Newspaper Arctic Ocean ice algae ice core Ocean acidification oden Sea ice Wiley Online Library Limnology and Oceanography 66 S1 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract The Arctic Ocean is more susceptible to ocean acidification than other marine environments due to its weaker buffering capacity, while its cold surface water with relatively low salinity promotes atmospheric CO 2 uptake. We studied how sea‐ice microbial communities in the central Arctic Ocean may be affected by changes in the carbonate system expected as a consequence of ocean acidification. In a series of four experiments during late summer 2018 aboard the icebreaker Oden , we addressed microbial growth, production of dissolved organic carbon (DOC) and extracellular polymeric substances (EPS), photosynthetic activity, and bacterial assemblage structure as sea‐ice microbial communities were exposed to elevated partial pressures of CO 2 (pCO 2 ). We incubated intact, bottom ice‐core sections and dislodged, under‐ice algal aggregates (dominated by Melosira arctica ) in separate experiments under approximately 400, 650, 1000, and 2000 μ atm pCO 2 for 10 d under different nutrient regimes. The results indicate that the growth of sea‐ice algae and bacteria was unaffected by these higher pCO 2 levels, and concentrations of DOC and EPS were unaffected by a shifted inorganic C/N balance, resulting from the CO 2 enrichment. These central Arctic sea‐ice microbial communities thus appear to be largely insensitive to short‐term pCO 2 perturbations. Given the natural, seasonally driven fluctuations in the carbonate system of sea ice, its resident microorganisms may be sufficiently tolerant of large variations in pCO 2 and thus less vulnerable than pelagic communities to the impacts of ocean acidification, increasing the ecological importance of sea‐ice microorganisms even as the loss of Arctic sea ice continues. |
author2 |
National Science Foundation Stiftelsen Olle Engkvist Byggmästare Vetenskapsrådet |
format |
Article in Journal/Newspaper |
author |
Torstensson, Anders Margolin, Andrew R. Showalter, Gordon M. Smith, Walker O. Shadwick, Elizabeth H. Carpenter, Shelly D. Bolinesi, Francesco Deming, Jody W. |
spellingShingle |
Torstensson, Anders Margolin, Andrew R. Showalter, Gordon M. Smith, Walker O. Shadwick, Elizabeth H. Carpenter, Shelly D. Bolinesi, Francesco Deming, Jody W. Sea‐ice microbial communities in the Central Arctic Ocean: Limited responses to short‐term pCO 2 perturbations |
author_facet |
Torstensson, Anders Margolin, Andrew R. Showalter, Gordon M. Smith, Walker O. Shadwick, Elizabeth H. Carpenter, Shelly D. Bolinesi, Francesco Deming, Jody W. |
author_sort |
Torstensson, Anders |
title |
Sea‐ice microbial communities in the Central Arctic Ocean: Limited responses to short‐term pCO 2 perturbations |
title_short |
Sea‐ice microbial communities in the Central Arctic Ocean: Limited responses to short‐term pCO 2 perturbations |
title_full |
Sea‐ice microbial communities in the Central Arctic Ocean: Limited responses to short‐term pCO 2 perturbations |
title_fullStr |
Sea‐ice microbial communities in the Central Arctic Ocean: Limited responses to short‐term pCO 2 perturbations |
title_full_unstemmed |
Sea‐ice microbial communities in the Central Arctic Ocean: Limited responses to short‐term pCO 2 perturbations |
title_sort |
sea‐ice microbial communities in the central arctic ocean: limited responses to short‐term pco 2 perturbations |
publisher |
Wiley |
publishDate |
2021 |
url |
http://dx.doi.org/10.1002/lno.11690 https://onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11690 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11690 https://aslopubs.onlinelibrary.wiley.com/doi/pdf/10.1002/lno.11690 |
genre |
Arctic Ocean ice algae ice core Ocean acidification oden Sea ice |
genre_facet |
Arctic Ocean ice algae ice core Ocean acidification oden Sea ice |
op_source |
Limnology and Oceanography volume 66, issue S1 ISSN 0024-3590 1939-5590 |
op_rights |
http://creativecommons.org/licenses/by/4.0/ http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1002/lno.11690 |
container_title |
Limnology and Oceanography |
container_volume |
66 |
container_issue |
S1 |
_version_ |
1810295405522452480 |