Seasonal Changes in Microbial Dissolved Organic Sulfur Transformations in Coastal Waters.

Dixon, JL; Hopkins, FE; Stephens, JA; Schaefer, H. 2020 Seasonal Changes in Microbial Dissolved Organic Sulfur Transformations in Coastal Waters. [in special issue: Microbial Cycling of Atmospheric Trace Gases] Microorganisms, 8, 337. 20, pp. https://doi.org/10.3390/microorganisms8030337

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Abstract/Summary

The marine trace gas dimethylsulfide (DMS) is the single most important biogenic source  of atmospheric sulfur, accounting for up to 80% of global biogenic sulfur emissions. Approximately  300 million tons of DMS are produced annually, but the majority is degraded by microbes in  seawater.  The  DMS  precursor  dimethylsulfoniopropionate  (DMSP)  and  oxidation  product  dimethylsulphoxide (DMSO) are also important organic sulfur reservoirs. However, the marine  sinks  of  dissolved  DMSO  remain  unknown.  We  used  a  novel  combination  of  stable  and  radiotracers to determine seasonal changes in multiple dissolved organic sulfur transformation  rates to ascertain whether microbial uptake of dissolved DMSO was a significant loss pathway.  Surface concentrations of DMS ranged from 0.5 to 17.0 nM with biological consumption rates  between 2.4 and 40.8 nM∙d−1. DMS produced from the reduction of DMSO was not a significant  process.  Surface  concentrations  of  total  DMSO  ranged  from  2.3  to  102  nM  with  biological  consumption of dissolved DMSO between 2.9 and 111 nM∙d−1. Comparisons between 14C2‐DMSO  assimilation and dissimilation rates suggest that the majority of dissolved DMSO was respired  (>94%). Radiotracer microbial consumption rates suggest that dissimilation of dissolved DMSO to  CO2 can be a significant loss pathway in coastal waters, illustrating the significance of bacteria in  controlling organic sulfur seawater concentrations

Item Type: Publication - Article
Additional Keywords: dimethylsulfide; dimethylsulfoxide; bacteria; dissimilation to CO2; radiotracers; stable  tracers; coastal variability
Subjects: Ecology and Environment
Marine Sciences
Oceanography
Divisions: Plymouth Marine Laboratory > Science Areas > Marine Biochemistry and Observations
Depositing User: Jo Dixon
Date made live: 29 Sep 2020 10:25
Last Modified: 29 Sep 2020 10:25
URI: http://plymsea.ac.uk/id/eprint/8893

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