English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/15797
Share/Impact:
Statistics
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:

Title

Transparent Exopolymer Particles (TEP) link phytoplankton and bacterial production in the Gulf of Aqaba

AuthorsBar-Zeev, Edo; Berman-Frank, Ilana; Stambler, Noga; Vázquez-Domínguez, Evaristo ; Zohary, Tamar; Capuzzo, Elisa; Meeder, Efrat; Suggett, David J.; Iluz, David; Dishon, Gal; Berman, Tom
Issue Date2009
PublisherInter Research
CitationAquatic Microbial Ecology 56(2-3): 217–225(2009)
AbstractVariations in Transparent Exopolymer Particles (TEP), bacterial biomass production (BP) and Primary Productivity (PP) were followed over 52 hours at a deepwater station in the Gulf of Aqaba (Eilat) during the spring, in April 2008. About 20 hours after the start of this study, there was a short (~15h) but intense storm event that probably caused a nutrient pulse and subsequently a brief outgrowth of diatoms in the euphotic water column. Concentrations of TEP and BP ranged from 23 to 228 μg Gum Xanthan equivalents L-1 and from 0.2 to 0.6 μg C L-1 h-1, respectively. TEP and BP were measured in both unfiltered and GF/C (1.2 μm) filtered samples. Most of the TEP (mean 59 ± 21% of total TEP) were usually in the smaller size fraction (>0.4 <1.2 μm) but after the crash of the diatoms the majority of TEP were > 1.2 μm. In the GF/C filtered fraction, BP averaged 59 ± 12% and 93 ± 5% of total BP in the upper water column and from 300 m, respectively. Significant correlations were observed between TEP and BP suggesting that active heterotrophic bacteria may have been associated with these particles. During the 3 days of this study PP and BP in the euphotic zone averaged 480 mg C m-2 d-1 and 225 mg C m-2 d-1 respectively suggesting that about half or more of the primary produced carbon was metabolized by heterotrophic bacteria in the upper water column. Coincident with strong mixing caused by the storm, TEP concentrations decreased in the surface water and increased at depth. We conjecture that TEP acted to link C flux between the primary producers and heterotrophic bacteria and that the downward movement of TEP from the upper water layers may be an important process in transferring organic carbon to deeper waters of the Gulf. Sinking TEP could provide not only organic C substrates for associated bacteria but also form "hot spots" of elevated microbial metabolism and nutrient cycling throughout the water column.
DescriptionArticle in press.
Publisher version (URL)http://dx.doi.org/10.3354/ame01322
URIhttp://hdl.handle.net/10261/15797
DOI10.3354/ame01322
ISSN0948-3055
E-ISSN1616-1564
Appears in Collections:(ICM) Artículos
Files in This Item:
File Description SizeFormat 
Bar_et_al_2009.pdf583,93 kBAdobe PDFThumbnail
View/Open
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.