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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Bibliographic Details
Published in:Limnology and Oceanography
Main Authors: Torstensson, Anders, Margolin, Andrew R., Showalter, Gordon M., Smith, Walker O., Shadwick, Elizabeth H., Carpenter, Shelly D., Bolinesi, Francesco, Deming, Jody W.
Other Authors: National Science Foundation, Stiftelsen Olle Engkvist Byggmästare, Vetenskapsrådet
Format: Article in Journal/Newspaper
Language:English
Published: Wiley 2021
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Online Access: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
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Summary: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.