English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/129742
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Dimethylsulfoniopropionate Turnover Is Linked to the Composition and Dynamics of the Bacterioplankton Assemblage during a Microcosm Phytoplankton Bloom

AuthorsPinhassi, Jarone; Simó, Rafel ; González, José M.; Vila-Costa, Maria ; Alonso-Sáez, Laura ; Kiene, Ronald P.; Moran, Mary Ann; Pedrós-Alió, Carlos
Issue DateDec-2005
PublisherAmerican Society for Microbiology
CitationApplied and Environmental Microbiology 71(12): 7650-7660 (2005)
AbstractProcessing of the phytoplankton-derived organic sulfur compound dimethylsulfoniopropionate (DMSP) by bacteria was studied in seawater microcosms in the coastal Gulf of Mexico (Alabama). Modest phytoplankton blooms (peak chlorophyll a [Chl a] concentrations of ∼2.5 μg liter-1) were induced in nutrient-enriched microcosms, while phytoplankton biomass remained low in unamended controls (Chl a concentrations of ∼0.34 μg liter -1). Particulate DMSP concentrations reached 96 nM in the enriched microcosms but remained approximately 14 nM in the controls. Bacterial biomass production increased in parallel with the increase in particulate DMSP, and nutrient limitation bioassays in the initial water showed that enrichment with DMSP or glucose caused a similar stimulation of bacterial growth. Concomitantly, increased bacterial consumption rate constants of dissolved DMSP (up to 20 day-1) and dimethylsulfide (DMS) (up to 6.5 day-1) were observed. Nevertheless, higher DMSP S assimilation efficiencies and higher contribution of DMSP to bacterial S demand were found in the controls compared to the enriched microcosms. This indicated that marine bacterioplankton may rely more on DMSP as a source of S under oligotrophic conditions than under the senescence phase of phytoplankton blooms. Phylogenetic analysis of the bacterial assemblages in all microcosms showed that the DMSP-rich algal bloom favored the occurrence of various Roseobacter members, flavobacteria (Bacteroidetes phylum), and oligotrophic marine Gammaproteobacteria. Our observations suggest that the composition of the bacterial assemblage and the relative contribution of DMSP to the overall dissolved organic sulfur/organic matter pool control how efficiently bacteria assimilate DMSP S and thereby potentially divert it from DMS production. Copyright © 2005, American Society for Microbiology. All Rights Reserved
Description11 pages, 5 figures, 4 tables
Publisher version (URL)http://dx.doi.org/10.1128/AEM.71.12.7650-7660.2005
Identifiersdoi: 10.1128/AEM.71.12.7650-7660.2005
issn: 0099-2240
e-issn: 1098-5336
Appears in Collections:(ICM) Artículos
Files in This Item:
There are no files associated with this item.
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.