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Impact of anthropogenic pH perturbation on dimethyl sulfide cycling: A peek into the microbial black box

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Title: Impact of anthropogenic pH perturbation on dimethyl sulfide cycling: A peek into the microbial black box
Authors: Benard, Robin Browse this author
Lizotte, Martine Browse this author
Levasseur, Maurice Browse this author
Scarratt, Michael Browse this author
Michaud, Sonia Browse this author
Starr, Michel Browse this author
Tremblay, Jean-Eric Browse this author
Kiene, Ronald P. Browse this author
Kameyama, Sohiko Browse this author →KAKEN DB
Keywords: Dimethyl sulfide
Ocean acidification
Microbial DMS yield
Microbial DMSP uptake
Issue Date: 2-Apr-2021
Publisher: University of California Press
Journal Title: Elementa: Science of the Anthropocene
Volume: 9
Issue: 1
Start Page: 00043
Publisher DOI: 10.1525/elementa.2021.00043
Abstract: The objective of this study was to assess experimentally the potential impact of anthropogenic pH perturbation (ApHP) on concentrations of dimethyl sulfide (DMS) and dimethylsulfoniopropionate (DMSP), as well as processes governing the microbial cycling of sulfur compounds. A summer planktonic community from surface waters of the Lower St. Lawrence Estuary was monitored in microcosms over 12 days under three pCO(2) targets: 1 x pCO(2) (775 mu atm), 2 x pCO(2) (1,850 mu atm), and 3 x pCO(2) (2,700 mu atm). A mixed phytoplankton bloom comprised of diatoms and unidentified flagellates developed over the course of the experiment. The magnitude and timing of biomass buildup, measured by chlorophyll a concentration, changed in the 3 x pCO(2) treatment, reaching about half the peak chlorophyll a concentration measured in the 1 x pCO(2) treatment, with a 2-day lag. Doubling and tripling the pCO(2) resulted in a 15% and 40% decline in average concentrations of DMS compared to the control. Results from S-35-DMSPd uptake assays indicated that neither concentrations nor microbial scavenging efficiency of dissolved DMSP was affected by increased pCO(2). However, our results show a reduction of the mean microbial yield of DMS by 34% and 61% in the 2 x pCO(2) and 3 x pCO(2) treatments, respectively. DMS concentrations correlated positively with microbial yields of DMS (Spearman's rho = 0.65; P < 0.001), suggesting that the impact of ApHP on concentrations of DMS in diatom-dominated systems may be strongly linked with alterations of the microbial breakdown of dissolved DMSP. Findings from this study provide further empirical evidence of the sensitivity of the microbial DMSP switch under ApHP. Because even small modifications in microbial regulatory mechanisms of DMSP can elicit changes in atmospheric chemistry via dampened efflux of DMS, results from this study may contribute to a better comprehension of Earth's future climate.
Type: article
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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