Evidence of prokaryotic metabolism on suspended particulate organic matter in the dark waters of the subtropical North Atlantic
12 pages, 6 figures, 2 tables The 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 dec...
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American Society of Limnology and Oceanography
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Online Access: | http://hdl.handle.net/10261/20344 https://doi.org/10.4319/lo.2009.54.1.0182 |
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ftcsic:oai:digital.csic.es:10261/20344 2024-02-11T09:56:29+01:00 Evidence of prokaryotic metabolism on suspended particulate organic matter in the dark waters of the subtropical North Atlantic Baltar, Federico Arístegui, Javier Gasol, Josep M. Sintes, Eva Herndl, Gerhard J. 2009-01 5875 bytes application/pdf http://hdl.handle.net/10261/20344 https://doi.org/10.4319/lo.2009.54.1.0182 en eng American Society of Limnology and Oceanography https://doi.org/10.4319/lo.2009.54.1.0182 Limnology and Oceanography 54(1): 182-193 (2009) 0024-3590 http://hdl.handle.net/10261/20344 doi:10.4319/lo.2009.54.1.0182 open artículo http://purl.org/coar/resource_type/c_6501 2009 ftcsic https://doi.org/10.4319/lo.2009.54.1.0182 2024-01-16T09:25:09Z 12 pages, 6 figures, 2 tables The 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 Peer reviewed Article in Journal/Newspaper Antarc* Antarctic North Atlantic North East Atlantic Digital.CSIC (Spanish National Research Council) Antarctic Mid-Atlantic Ridge The Antarctic Limnology and Oceanography 54 1 182 193 |
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Digital.CSIC (Spanish National Research Council) |
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ftcsic |
language |
English |
description |
12 pages, 6 figures, 2 tables The 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 Peer reviewed |
format |
Article in Journal/Newspaper |
author |
Baltar, Federico Arístegui, Javier Gasol, Josep M. Sintes, Eva Herndl, Gerhard J. |
spellingShingle |
Baltar, Federico Arístegui, Javier Gasol, Josep M. Sintes, Eva Herndl, Gerhard J. Evidence of prokaryotic metabolism on suspended particulate organic matter in the dark waters of the subtropical North Atlantic |
author_facet |
Baltar, Federico Arístegui, Javier Gasol, Josep M. Sintes, Eva Herndl, Gerhard J. |
author_sort |
Baltar, Federico |
title |
Evidence of prokaryotic metabolism on suspended particulate organic matter in the dark waters of the subtropical North Atlantic |
title_short |
Evidence of prokaryotic metabolism on suspended particulate organic matter in the dark waters of the subtropical North Atlantic |
title_full |
Evidence of prokaryotic metabolism on suspended particulate organic matter in the dark waters of the subtropical North Atlantic |
title_fullStr |
Evidence of prokaryotic metabolism on suspended particulate organic matter in the dark waters of the subtropical North Atlantic |
title_full_unstemmed |
Evidence of prokaryotic metabolism on suspended particulate organic matter in the dark waters of the subtropical North Atlantic |
title_sort |
evidence of prokaryotic metabolism on suspended particulate organic matter in the dark waters of the subtropical north atlantic |
publisher |
American Society of Limnology and Oceanography |
publishDate |
2009 |
url |
http://hdl.handle.net/10261/20344 https://doi.org/10.4319/lo.2009.54.1.0182 |
geographic |
Antarctic Mid-Atlantic Ridge The Antarctic |
geographic_facet |
Antarctic Mid-Atlantic Ridge The Antarctic |
genre |
Antarc* Antarctic North Atlantic North East Atlantic |
genre_facet |
Antarc* Antarctic North Atlantic North East Atlantic |
op_relation |
https://doi.org/10.4319/lo.2009.54.1.0182 Limnology and Oceanography 54(1): 182-193 (2009) 0024-3590 http://hdl.handle.net/10261/20344 doi:10.4319/lo.2009.54.1.0182 |
op_rights |
open |
op_doi |
https://doi.org/10.4319/lo.2009.54.1.0182 |
container_title |
Limnology and Oceanography |
container_volume |
54 |
container_issue |
1 |
container_start_page |
182 |
op_container_end_page |
193 |
_version_ |
1790603543134076928 |