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Title

Occurrence and transformation of dissolved dimethyl sulfur species in stratified seawater (western Mediterranean Sea)

AuthorsSimó, Rafel ; Grimalt, Joan O.; Pedrós-Alió, Carlos ; Albaigés Riera, Joan
KeywordsDimethylsulfoniopropionate
Microbial heterotrophic activity
Stratified marine systems
Dimethylsulfoxide
Dimethyl sulfide
Issue DateNov-1995
PublisherInter Research
CitationMarine Ecology Progress Series 127: 291-299 (1995)
AbstractDimethyl sulfide (DMS), dissolved dimethylsulfoniopropionate (DMSPd) and dimethylsulf-oxide (DMSO) were measured in Mediterranean seawater. In the open surface waters of late spring to early summer, DMSO (18 nM) was the main methylated sulfur compound and dominated over DMS (1.7 nM) by 1 order of magnitude. Conversely, DMSPd occurred at lower concentrations (0.55 nM) than DMS. The higher abundance of DMS over DMSPd, the poor correlation between surface DMS and chlorophyll a, and microscopic examination of the algal populations suggest that DMS essentially originated from decomposition of the DMSPd generated in a late decay phase of the spring phytoplankton development. On the other hand, the vertical profile of the dissolved dimethyl sulfur species and the depth distribution of both biological DMS production and consumption rates point to the concurrence of the biogenic cycles of DMS and carbon. Thus, highest DMS production occurs near the subsurface chlorophyll maximum in coincidence with the water column layers of highest microbial heterotrophic activity. Finally, the high DMSO concentrations suggest that this species may act as a major nonvolatile dimethyl sulfur pool in these waters
Description9 pages, 4 figures, 1 table
Publisher version (URL)https://dx.doi.org/10.3354/meps127291
URIhttp://hdl.handle.net/10261/182971
Identifiersdoi: 10.3354/meps127291
issn: 0171-8630
e-issn: 1616-1599
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