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Coupled dynamics of dimethylsulfoniopropionate and dimethylsulfide cycling and the microbial food web in surface waters of the North Atlantic.

Simo, Rafael, Archer, Stephen D, Pedrós-Alió, Carlos, Gilpin, Linda and Stelfox-Widdicombe, Claire E (2002) Coupled dynamics of dimethylsulfoniopropionate and dimethylsulfide cycling and the microbial food web in surface waters of the North Atlantic. Limnology and Oceanography, 47 (1). pp. 53-61. ISSN 0024 3590

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Abstract/Description

Oceanic dimethylsulfide (DMS), the main natural source of sulfur to the global atmosphere, is suggested to play a key role in the interaction between marine biota and climate. Its biochemical precursor is dimethylsulfoniopropionate (DMSP), a globally distributed, intracellular constituent in marine phytoplankton. During a multidisciplinary Lagrangian experiment in the subpolar North Atlantic, we determined the fluxes of DMSP and DMS through phytoplankton, microzooplankton, and bacterioplankton and compared them with concurrent carbon and sulfur fluxes through primary and secondary productions, grazing, and release and use of dissolved organic matter. We found that DMSP and derivatives contributed most (48-100%) of the sulfur fluxes and 5-15% of the carbon fluxes. Our findings highlight DMSP as a prominent player in pelagic biogeochemical pumps, especially as a major carrier in organic sulfur cycling. Also, our results illustrate the key role played by microzooplankton and heterotrophic bacteria (hence the microbial food web) in controlling the amount of phytoplanktonic DMSP that ultimately vents to the atmosphere in the form of DMS.

Item Type: Article
Print ISSN: 0024 3590
Uncontrolled Keywords: prokaryotes ; plankton ; Atlantic Ocean ; ecosystems ; biogenic effects ; bacteria ; primary productivity ; microorganisms ; zooplankton ; phytoplankton ; dimethyl sulfide ; hydrochemistry ; sea water ; surface water ; North Atlantic ;
University Divisions/Research Centres: Faculty of Health, Life & Social Sciences > School of Life Sciences
Dewey Decimal Subjects: 500 Science > 550 Earth sciences & geology
500 Science > 570 Life sciences; biology > 570 Life sciences; biology
Library of Congress Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QH Natural history > QH301 Biology
G Geography. Anthropology. Recreation > GC Oceanography
Item ID: 1685
Depositing User: RAE Import
Date Deposited: 04 Jul 2008 12:02
Last Modified: 16 Aug 2013 15:04
URI: http://researchrepository.napier.ac.uk/id/eprint/1685

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