English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/20344
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 | DATACITE
Exportar a otros formatos:


Evidence of prokaryotic metabolism on suspended particulate organic matter in the dark waters of the subtropical North Atlantic

AuthorsBaltar, Federico; Arístegui, Javier; Gasol, Josep M. ; Sintes, Eva; Herndl, Gerhard J.
Issue DateJan-2009
PublisherAmerican Society of Limnology and Oceanography
CitationLimnology and Oceanography 54(1): 182-193 (2009)
AbstractThe distribution of prokaryotic abundance (PA), respiratory activity (ETS), heterotrophic production (PHP), and suspended particulate (POM) and dissolved (DOM) organic matter was determined in the meso- and bathypelagic waters of the (sub)tropical North Atlantic. PA decreased by one order of magnitude from the lower euphotic zone to the bathypelagic waters, while ETS decreased by two and PHP by three orders of magnitude. On a section following the Mid-Atlantic Ridge from 35uN to 5uN, ETS below 1000-m depth increased southwards up to three-fold. This latitudinal gradient in the deep waters was paralleled by a six-fold increase in Particulate Organic Carbon (POC), whereas no trend was apparent in the DOM distribution. Significant correlations between POM and ETS were obtained in the water masses between 1000-m and 3000-m depth, the Antarctic Intermediate Water and the North East Atlantic Deep Water. A strong imbalance in the dark ocean was found between prokaryotic carbon demand (estimated through two different approaches) and the carbon sinking flux derived from sediment-trap records corrected with 230Th. The imbalance was greater when deeper in the water column, suggesting that the suspended carbon pool must account for most of the carbon deficit. Our results, together with other recent findings discussed in this paper, indicate that microbial life in the dark ocean is likely more dependent on slowly sinking or buoyant, laterally advected suspended particles than hitherto assumed
Description12 pages, 6 figures, 2 tables
Publisher version (URL)https://doi.org/10.4319/lo.2009.54.1.0182
Appears in Collections:(ICM) Artículos
Files in This Item:
File Description SizeFormat 
Baltar_et_al_2009.pdf3,21 MBAdobe PDFThumbnail
Show full item record
Review this work

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