Temporal variability of dimethylsulfide and dimethylsulfoniopropionate in the Sargasso Sea

Dacey, John W. H.; Howse, F.; Michaels, Anthony F.; Wakeham, Stuart G.

doi:10.1016/s0967-0637(98)00048-x

Cited by 149 publications

(171 citation statements)

References 0 publications

Supporting

Mentioning

152

Contrasting

Order By: Relevance

“…Nonetheless, the oligotrophic regions make up a large fraction of the world ocean and therefore contribute significantly to global DMS flux to the atmosphere (Bates et al 1992;Kettle et al 1999). Although DMS concentrations in low nutrient water masses do not usually reach the spectacular levels sometimes found in temperate and polar seas, DMS concentrations in oligotrophic waters can reach concentrations of 5-12 nM, even though phytoplankton biomass and DMSP levels there are low (Dacey et al 1998). It is interesting that we observed higher concentrations and a larger range of DMS concentrations in the oceanic sites as compared with the shelf sites ( Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Natural sulfur emissions contribute to the acidic sulfate aerosol burden in the atmosphere, which in turn plays an important role in climatic processes and atmospheric chemistry (Charlson et al 1987;Andreae and Crutzen 1997). The rate of DMS emission depends directly on the concentration of DMS in surface waters, which is controlled by complex production and removal processes that are closely tied to food web dynamics and physical factors such as air-sea exchange, water column mixing and photochemistry (Kieber et al 1996;Dacey et al 1998;Simó and Pedrós-Alió 1999). Although DMSPd has been suggested as the source of most DMS (Turner et al 1988), considerable uncertainty remains concerning the relationship between DMS production and that of DMSP turnover under in situ conditions.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Distribution and turnover of dissolved DMSP and its relationship with bacterial production and dimethylsulfide in the Gulf of Mexico

Kiene

Linn

2000

Limnology & Oceanography

197

163

View full text Add to dashboard Cite

We measured the distribution of particulate and dissolved pools of the phytoplankton osmolyte dimethylsulfoniopropionate (DMSP) in the euphotic zone at a series of shelf (Ͻ40 m total water depth) and oceanic (Ͼ500 m depth) stations in the northern Gulf of Mexico. We also measured turnover rates of the dissolved DMSP pools (DMSPd) with tracer additions of 35 S-DMSPd and short-term (Ͻ1 h) incubations, with the aim of examining the relationship between DMSPd turnover and bacterial production. Particulate DMSP concentrations were relatively low (Ͻ25 nM) throughout the study area with about twofold higher mean concentration at the shelf sites (15 nM) compared with the oligotrophic oceanic sites (7 nM). DMSPd concentrations averaged 3.0 nM in shelf waters and 1.3 nM in oceanic waters. Concentrations of dimethylsulfide (DMS), a degradation product of DMSP, also were low throughout the Gulf, averaging 2.0 nM for all depths sampled and 2.5 nM in surface waters. Microbial assemblages metabolized 35 S-DMSPd with the sulfur being incorporated into biomass, volatile compounds (DMS and methanethiol), and other dissolved products. DMSPd turnover was relatively slow (mean of 3.8 nM d Ϫ1) in oligotrophic oceanic waters and averaged 10-fold higher (39 nM d Ϫ1) in mesotrophic shelf waters. DMS concentrations ranged from 0.2 to 5.1 nM in oceanic waters and appeared to be weakly related to DMSP turnover. In contrast, DMS concentrations in shelf waters fell within a narrow range (0.8-2.8 nM) and showed no relationship at all with DMSPd turnover. DMSPd turnover rates were high enough to sustain the measured concentrations and estimated turnover of DMS, even if the conversion efficiency of DMSPd into DMS was only 10%. DMSPd turnover was significantly correlated with bacterial production (as measured by 3 H-thymidine incorporation) and we estimate that DMSPd turnover contributed a mean of 3.4% of the carbon and ϳ100% of the sulfur required for bacterial growth in Gulf of Mexico surface waters. In addition to its role as a precursor of DMS, DMSP deserves attention as an important substrate for bacterioplankton in the euphotic zone.Dimethylsulfoniopropionate ((CH 3 ) 2 S ϩ CH 2 CH 2 COO Ϫ ; DMSP) is a sulfur-containing compound that is produced by a wide variety of marine phytoplankton and is distributed throughout the euphotic zone of the oceans (Keller et al. 1989;Kettle et al. 1999). DMSP is present in operationallydefined particulate (DMSPp) and dissolved (DMSPd) forms with the DMSPp pool consisting of filterable phytoplankton and organisms that have accumulated DMSP from their diet. Concentrations of DMSPp typically range from 5 to Ͼ300 nM depending on factors such as phytoplankton biomass and species composition (Iverson et al. 1989;Malin et al. 1993). The dissolved DMSP pool is generally smaller (1-50 nM) than the particulate pool, but is believed to be more dynamic, with turnover times estimated to be on the order of hours in subtropical waters (Kiene 1996b;Ledyard and Dacey 1996). 1 Corresponding author (rkiene@jaguar1.u...

show abstract

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Distribution and turnover of dissolved DMSP and its relationship with bacterial production and dimethylsulfide in the Gulf of Mexico

Kiene

Linn

2000

Limnology & Oceanography

197

163

View full text Add to dashboard Cite

show abstract

“…The Bermuda Atlantic Time-series Study (BATS) site, and its companion site Hydrostation S, provide one of the longest oceanographic timeseries datasets and have been instrumental in improving our understanding of oligotrophic ocean physics, chemistry and biology. In 1998, Dacey et al, [14] hereafter referred to as D98, published a 2-year dataset of monthly DMS, DMSPp and DMSPd concentrations measurements from the BATS and Hydrostation S sites made between 1992 and 1993. This keystone work has been used extensively for hypothesis generation, most notably the classic DMS(P) 'summer paradox' hypothesis, [15] and model validation.…”

Section: Introductionmentioning

confidence: 99%

Revising upper-ocean sulfur dynamics near Bermuda: new lessons from 3 years of concentration and rate measurements

et al. 2016

View full text Add to dashboard Cite

Environmental context. Microscopic marine organisms have the potential to influence the global climate through the production of a trace gas, dimethylsulfide, which contributes to cloud formation. Using 3 years of observations, we investigated the environmental drivers behind the production and degradation of dimethylsulfide and its precursor dimethylsulfoniopropionate. Our results highlight the important role of the microbial community in rapidly cycling these compounds and provide an important dataset for future modelling studies.Abstract. Oceanic biogeochemical cycling of dimethylsulfide (DMS), and its precursor dimethylsulfoniopropionate (DMSP), has gained considerable attention over the past three decades because of the potential role of DMS in climate mediation. Here we report 3 years of monthly vertical profiles of organic sulfur cycle concentrations (DMS, particulate DMSP (DMSPp) and dissolved DMSP (DMSPd)) and rates (DMSPd consumption, biological DMS consumption and DMS photolysis) from the Bermuda Atlantic Time-series Study (BATS) site taken between 2005 and 2008. Concentrations confirm the summer paradox with mixed layer DMS peaking ,90 days after peak DMSPp and ,50 days after peak DMSPp : Chl. A small decline in mixed layer DMS was observed relative to those measured during a previous study at BATS (1992)(1993)(1994), potentially driven by long-term climate shifts at the site. On average, DMS cycling occurred on longer timescales than DMSPd (0.43 AE 0.35 v. 1.39 AE 0.76 day À1 ) with DMSPd consumption rates remaining elevated throughout the year despite significant seasonal variability in the bacterial DMSP degrader community. DMSPp was estimated to account for 4-5 % of mixed layer primary production and turned over at a significantly slower rate (,0.2 day À1 ). Photolysis drove DMS loss in the mixed layer during the summer, whereas biological consumption of DMS was the dominant loss process in the winter and at depth. These findings offer new insight into the underlying mechanisms driving DMS(P) cycling in the oligotrophic ocean, provide an extended dataset for future model evaluation and hypothesis testing and highlight the need for a reexamination of past modelling results and conclusions drawn from data collected with old methodologies.

show abstract

“…It is characterized by nutrient-depleted waters in the euphotic zone broken by upwelling eddies that increase chlorophyll a (Chla) in the surface during spring (McGillicuddy, 1998). Three characteristics make this location ideal for genomic-based DMSP studies: (1) DMSP dynamics and pools have been described in previous studies and point to an active role for bacteria in the cycle (Ledyard and Dacey, 1996;Dacey et al, 1998;Harada et al, 2004); (2) a high percentage of bacteria assimilate DMSP in this location (Malmstrom et al, 2004b(Malmstrom et al, , 2005; and (3) an extensive metagenomic database already exists for this site (Venter et al, 2004; although from a different date than our study).…”

Section: Introductionmentioning

confidence: 99%

Transcriptomic analysis of a marine bacterial community enriched with dimethylsulfoniopropionate

et al. 2010

View full text Add to dashboard Cite

Dimethylsulfoniopropionate (DMSP) is an important source of reduced sulfur and carbon for marine microbial communities, as well as the precursor of the climate-active gas dimethylsulfide (DMS). In this study, we used metatranscriptomic sequencing to analyze gene expression profiles of a bacterial assemblage from surface waters at the Bermuda Atlantic Time-series Study (BATS) station with and without a short-term enrichment of DMSP (25 nM for 30 min). An average of 303 143 reads were obtained per treatment using 454 pyrosequencing technology, of which 51% were potential protein-encoding sequences. Transcripts from Gammaproteobacteria and Bacteroidetes increased in relative abundance on DMSP addition, yet there was little change in the contribution of two bacterioplankton groups whose cultured members harbor known DMSP degradation genes, Roseobacter and SAR11. The DMSP addition led to an enrichment of transcripts supporting heterotrophic activity, and a depletion of those encoding light-related energy generation. Genes for the degradation of C3 compounds were significantly overrepresented after DMSP addition, likely reflecting the metabolism of the C3 component of DMSP. Mapping these transcripts to known biochemical pathways indicated that both acetyl-CoA and succinyl-CoA may be common entry points of this moiety into the tricarboxylic acid cycle. In a short time frame (30 min) in the extremely oligotrophic Sargasso Sea, different gene expression patterns suggest the use of DMSP by a diversity of marine bacterioplankton as both carbon and sulfur sources.

show abstract

Temporal variability of dimethylsulfide and dimethylsulfoniopropionate in the Sargasso Sea

Cited by 149 publications

References 0 publications

Distribution and turnover of dissolved DMSP and its relationship with bacterial production and dimethylsulfide in the Gulf of Mexico

Distribution and turnover of dissolved DMSP and its relationship with bacterial production and dimethylsulfide in the Gulf of Mexico

Revising upper-ocean sulfur dynamics near Bermuda: new lessons from 3 years of concentration and rate measurements

Transcriptomic analysis of a marine bacterial community enriched with dimethylsulfoniopropionate

Contact Info

Product

Resources

About