Profiles of DMSP, algal pigments, nutrients and salinity in pack ice from eastern Antarctica

Trevena, Anne; Jones, Graham B; Wright, Simon W.; Enden, Rick L. van den

doi:10.1016/s1385-1101(00)00012-5

Cited by 56 publications

(48 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sea ice concentrations in DMS and DMSP are not only extremely high but also extremely variable, as illustrated by high-resolution vertical profiles [Trevena et al, 2000;2003;Tison et al, 2010] and strong regional and seasonal variations [e.g., Turner et al, 1995 ;Curran and Jones, 2000]. This variability results from complex interactions between the physical, biological and chemical processes that drive the DMS(P) cycle [Stefels et al, 2007], and sea ice thermodynamic processes.…”

Section: Other Climatically Significant Gases: Dms N 2 O and Chmentioning

confidence: 99%

“…Many of these processes are difficult to follow separately in field studies and remain poorly quantified and understood. Some authors [Levasseur et al, 1994;Trevena et al, 2000;Tison et al, 2010] have shown the strong influence of community composition on the DMS and DMSP profiles (the biosynthesis of DMSP being species specific). Tison et al [2010] described the influence of temporal changes in brine volume and brine salinity on the vertical migration of DMS and DMSP within sea ice.…”

Section: Other Climatically Significant Gases: Dms N 2 O and Chmentioning

confidence: 99%

See 1 more Smart Citation

Role of sea ice in global biogeochemical cycles: emerging views and challenges

Vancoppenolle

Meiners

Michel

et al. 2013

Quaternary Science Reviews

212

215

View full text Add to dashboard Cite

International audienceObservations from the last decade suggest an important role of sea ice in the global biogeochemical cycles, promoted by (i) active biological and chemical processes within the sea ice; (ii) fluid and gas exchanges at the sea ice interface through an often permeable sea ice cover; and (iii) tight physical, biological and chemical interactions between the sea ice, the ocean and the atmosphere. Photosynthetic micro-organisms in sea ice thrive in liquid brine inclusions encased in a pure ice matrix, where they find suitable light and nutrient levels. They extend the production season, provide a winter and early spring food source, and contribute to organic carbon export to depth. Under-ice and ice edge phytoplankton blooms occur when ice retreats, favoured by increasing light, stratification, and by the release of material into the water column. In particular, the release of iron - highly concentrated in sea ice - could have large effects in the iron-limited Southern Ocean. The export of inorganic carbon transport by brine sinking below the mixed layer, calcium carbonate precipitation in sea ice, as well as active ice-atmosphere carbon dioxide (CO₂) fluxes, could play a central role in the marine carbon cycle. Sea ice processes could also significantly contribute to the sulphur cycle through the large production by ice algae of dimethylsulfoniopropionate (DMSP), the precursor of sulphate aerosols, which as cloud condensation nuclei have a potential cooling effect on the planet. Finally, the sea ice zone supports significant ocean-atmosphere methane (CH₄) fluxes, while saline ice surfaces activate springtime atmospheric bromine chemistry, setting ground for tropospheric ozone depletion events observed near both poles. All these mechanisms are generally known, but neither precisely understood nor quantified at large scales. As polar regions are rapidly changing, understanding the large-scale polar marine biogeochemical processes and their future evolution is of high priority. Earth system models should in this context prove essential, but they currently represent sea ice as biologically and chemically inert. Palaeoclimatic proxies are also relevant, in particular the sea ice proxies, inferring past sea ice conditions from glacial and marine sediment core records and providing analogues for future changes. Being highly constrained by marine biogeochemistry, sea ice proxies would not only contribute to but also benefit from a better understanding of polar marine biogeochemical cycles

show abstract

Section: Other Climatically Significant Gases: Dms N 2 O and Chmentioning

confidence: 99%

Section: Other Climatically Significant Gases: Dms N 2 O and Chmentioning

confidence: 99%

Role of sea ice in global biogeochemical cycles: emerging views and challenges

Vancoppenolle

Meiners

Michel

et al. 2013

Quaternary Science Reviews

212

215

View full text Add to dashboard Cite

show abstract

“…The most commonly held view is that DMSP, along with a number of other compounds, acts as a compatible solute in cells (Viaravamurthy et al 1985, Dickson & Kirst 1987a,b, Kirst 1996. In a similar osmotic role, DMSP may act as a cryoprotectant, and high concentrations have been recorded in polar macroalgae (Karsten et al 1992) and in sea-ice micro-algae (Kirst et al 1991, Trevena et al 2000. DMSP synthesis in marine microalgae is thought to proceed via 1 of 3 elucidated pathways from methionine and involves transamination, reduction, S-methylation and oxidative decarboxylation steps (Gage et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Production and turnover of particulate dimethylsulphoniopropionate during a coccolithophore bloom in the northern North Sea

Archer

Widdicombe²,

Tarran³

et al. 2001

Aquat. Microb. Ecol.

View full text Add to dashboard Cite

Dimethylsulphoniopropionate (DMSP) synthesised by phytoplankton is the principal precursor of the climatically active gas dimethyl sulphide (DMS). The rates of production of particulate DMSP (DMSPp) and turnover by microzooplankton were determined in surface waters of the northern North Sea, using a dilution approach. The phytoplankton communities were characterised by DMSPrich taxa including Emiliania huxleyi and Prorocentrum minimum and DMSPp:chlorophyll a (chl a) ratios of 64 to 162 nM µg -1 . Microzooplankton biomass varied from 25.5 to 56.7 µg C l -1 and was dominated by oligotrich ciliates and heterotrophic dinoflagellates. DMSPp production rates ranged from 14.8 to 45.6 nM d -1 and represent a doubling time of the ambient DMSPp pool of between 1.2 and 3.1 d. Consumption rates of DMSPp by microzooplankton varied between 11.4 and 59.9 nM d -1 and were equivalent to turnover rates of the ambient DMSPp pool of between 16 and 43% d -1 . In general, production rates of DMSPp were lower than those of chl a and E. huxleyi, with respective mean doubling times of 1.9, 1.5 and 1.3 d. Loss rates due to grazing were similar for DMSPp and E. huxleyi but generally significantly lower than those of the bulk phytoplankton, with mean turnover rates of 31, 30 and 40% d -1 of the standing stock of DMSPp, E. huxleyi and chl a, respectively. E. huxleyi contributed an estimated 2 to 25% of the total DMSPp production and 6 to 23% of the DMSPp ingested by microzooplankton, indicating the importance of other phytoplankton to DMSPp dynamics in 'E. huxleyi blooms'. At the depths sampled, DMSPp production was closely coupled to primary production and was equivalent to approximately 11% of the carbon fixation. DMSPp may be an important component of the diets of microzooplankton. Ingested DMSPp could have provided 2 to 3% of the microzooplankton carbon demand and 26 to 44% of their sulphur demand. DMSPp production and turnover rates were closely matched and suggest that in these waters microzooplankton grazing may be the principal determinant of the fate of DMSPp. The quantity of 'DMSP' excreted by microzooplankton, calculated from ingestion rates, biomass and assumed growth rates and growth efficiencies, ranged from 8.0 to 41.9 nM d

show abstract

“…On the other hand, synthesis of amino acid osmolytes in response to salinity stress, such as Pro, help maintain internal osmotic balance in sea-ice diatoms . The compound dimethylsulfoniopropionate (DMSP) has also been found in high levels within sea-ice diatoms (Kirst et al, 1991;Levasseur, 1994;DiTullio et al, 1998;Trevena et al, 2000;Lee et al, 2001), in stark contrast to the typically low levels seen in temperate diatoms (Keller et al, 1989). DMSP synthesis may be another physiological mechanism by which sea-ice diatoms combat environmental stress.…”

mentioning

confidence: 99%

Proteomic Analysis of a Sea-Ice Diatom: Salinity Acclimation Provides New Insight into the Dimethylsulfoniopropionate Production Pathway

et al. 2011

View full text Add to dashboard Cite

Dimethylsulfoniopropionate (DMSP) plays important roles in oceanic carbon and sulfur cycling and may significantly impact climate. It is a biomolecule synthesized from the methionine (Met) pathway and proposed to serve various physiological functions to aid in environmental stress adaptation through its compatible solute, cryoprotectant, and antioxidant properties. Yet, the enzymes and mechanisms regulating DMSP production are poorly understood. This study utilized a proteomics approach to investigate protein changes associated with salinity-induced DMSP increases in the model sea-ice diatom Fragilariopsis cylindrus (CCMP 1102). We hypothesized proteins associated with the Met-DMSP biosynthesis pathway would increase in relative abundance when challenged with elevated salinity. To test this hypothesis axenic log-phase cultures initially grown at a salinity of 35 were gradually shifted to a final salinity of 70 over a 24-h period. Intracellular DMSP was measured and two-dimensional gel electrophoresis was used to identify protein changes at 48 h after the shift. Intracellular DMSP increased by approximately 85% in the hypersaline cultures. One-third of the proteins increased under high salinity were associated with amino acid pathways. Three protein isoforms of S-adenosylhomo-cysteine hydrolase, which synthesizes a Met precursor, increased 1.8-to 2.1-fold, two isoforms of S-adenosyl Met synthetase increased 1.9-to 2.5-fold, and S-adenosyl Met methyltransferase increased by 2.8-fold, suggesting active methyl cycle proteins are recruited in the synthesis of DMSP. Proteins from the four enzyme classes of the proposed algal Met transaminase DMSP pathway were among the elevated proteins, supporting our hypothesis and providing candidate genes for future characterization studies.

show abstract

Profiles of DMSP, algal pigments, nutrients and salinity in pack ice from eastern Antarctica

Cited by 56 publications

References 18 publications

Role of sea ice in global biogeochemical cycles: emerging views and challenges

Role of sea ice in global biogeochemical cycles: emerging views and challenges

Production and turnover of particulate dimethylsulphoniopropionate during a coccolithophore bloom in the northern North Sea

Proteomic Analysis of a Sea-Ice Diatom: Salinity Acclimation Provides New Insight into the Dimethylsulfoniopropionate Production Pathway

Contact Info

Product

Resources

About