Shedding ligth on the role of the prokaryotic assemblage in the biogeochemical cycles of the dark ocean
Memoria de tesis doctoral presentada por Federico Baltar González para obtener el grado de Doctor en Oceanografía por la Universidad de las Palmas de Gran Canaria (ULPGC), bieno (2005-2007), realizada bajo la dirección del Dr. Javier Arístegui Ruiz, del Dr. Gerhard Herndl y del Dr. Josep Maria Gasol...
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Universidad de Las Palmas de Gran Canaria
2010
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ftcsic:oai:digital.csic.es:10261/101845 2024-02-11T10:06:46+01:00 Shedding ligth on the role of the prokaryotic assemblage in the biogeochemical cycles of the dark ocean Arrojando luz sobre el papel de los procariotas en los ciclos biogeoquímicos del océano oscuro Baltar, Federico Aristegui, Javier Herndl, Gerhard J. Gasol, Josep M. 2010 http://hdl.handle.net/10261/101845 unknown Universidad de Las Palmas de Gran Canaria http://hdl.handle.net/10261/101845 open tesis doctoral http://purl.org/coar/resource_type/c_db06 2010 ftcsic 2024-01-16T10:01:05Z Memoria de tesis doctoral presentada por Federico Baltar González para obtener el grado de Doctor en Oceanografía por la Universidad de las Palmas de Gran Canaria (ULPGC), bieno (2005-2007), realizada bajo la dirección del Dr. Javier Arístegui Ruiz, del Dr. Gerhard Herndl y del Dr. Josep Maria Gasol Piqué del Institut de Ciències del Mar (ICM-CSIC).-- 317 pages [EN] Prokaryotes are the cornerstone mediating the oceanic biogeochemical cycles. Due to the typical extreme abiotic conditions (e.g. high pressure, low temperature, low availability of organic matter) found in the dark ocean (> 200 m depth), it was generally assumed to be a site holding negligible, homogeneously-distributed biological activity. That is why most of the research done concerning the ecology ofprokaryotes have been carried out in surface waters, further leaving behind the study of the largest habitat in the biosphere: the dark ocean. In this study we assessed the actual role of the deep-sea prokaryotes in the marine biogeochemical cycles. The distribution of the organic matter pool (dissolved and particulate), the prokaryotic assemblage structure, abundance and metabolism (heterotrophic production, respiration, extracellular enzymatic activity) were analyzed along the water column of the North Atlantic, in six different research cruises. We found that the dark ocean plays a key role in the carbon mineralization processes (sometimes being, on a per-cell level, as active as the epipelagic waters), being far from a homogenously-distributed non-active ecosystem. The heterogeneity found in the dark ocean seemed to be controlled by a “bottom-up” effect, where the suspended particulate organic matter distribution modulates the prokaryotic activity. This stronger association between suspended particles and deepsea prokaryotes than assumed hitherto, would facilitate synergistic interactions in the cycling of matter in the dark ocean. Finally, we also found that the enigmatic imbalance between the organic carbon supply to the dark ocean and the ... Doctoral or Postdoctoral Thesis North Atlantic Digital.CSIC (Spanish National Research Council) Las Palmas ENVELOPE(-60.674,-60.674,-62.971,-62.971) |
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Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
description |
Memoria de tesis doctoral presentada por Federico Baltar González para obtener el grado de Doctor en Oceanografía por la Universidad de las Palmas de Gran Canaria (ULPGC), bieno (2005-2007), realizada bajo la dirección del Dr. Javier Arístegui Ruiz, del Dr. Gerhard Herndl y del Dr. Josep Maria Gasol Piqué del Institut de Ciències del Mar (ICM-CSIC).-- 317 pages [EN] Prokaryotes are the cornerstone mediating the oceanic biogeochemical cycles. Due to the typical extreme abiotic conditions (e.g. high pressure, low temperature, low availability of organic matter) found in the dark ocean (> 200 m depth), it was generally assumed to be a site holding negligible, homogeneously-distributed biological activity. That is why most of the research done concerning the ecology ofprokaryotes have been carried out in surface waters, further leaving behind the study of the largest habitat in the biosphere: the dark ocean. In this study we assessed the actual role of the deep-sea prokaryotes in the marine biogeochemical cycles. The distribution of the organic matter pool (dissolved and particulate), the prokaryotic assemblage structure, abundance and metabolism (heterotrophic production, respiration, extracellular enzymatic activity) were analyzed along the water column of the North Atlantic, in six different research cruises. We found that the dark ocean plays a key role in the carbon mineralization processes (sometimes being, on a per-cell level, as active as the epipelagic waters), being far from a homogenously-distributed non-active ecosystem. The heterogeneity found in the dark ocean seemed to be controlled by a “bottom-up” effect, where the suspended particulate organic matter distribution modulates the prokaryotic activity. This stronger association between suspended particles and deepsea prokaryotes than assumed hitherto, would facilitate synergistic interactions in the cycling of matter in the dark ocean. Finally, we also found that the enigmatic imbalance between the organic carbon supply to the dark ocean and the ... |
author2 |
Aristegui, Javier Herndl, Gerhard J. Gasol, Josep M. |
format |
Doctoral or Postdoctoral Thesis |
author |
Baltar, Federico |
spellingShingle |
Baltar, Federico Shedding ligth on the role of the prokaryotic assemblage in the biogeochemical cycles of the dark ocean |
author_facet |
Baltar, Federico |
author_sort |
Baltar, Federico |
title |
Shedding ligth on the role of the prokaryotic assemblage in the biogeochemical cycles of the dark ocean |
title_short |
Shedding ligth on the role of the prokaryotic assemblage in the biogeochemical cycles of the dark ocean |
title_full |
Shedding ligth on the role of the prokaryotic assemblage in the biogeochemical cycles of the dark ocean |
title_fullStr |
Shedding ligth on the role of the prokaryotic assemblage in the biogeochemical cycles of the dark ocean |
title_full_unstemmed |
Shedding ligth on the role of the prokaryotic assemblage in the biogeochemical cycles of the dark ocean |
title_sort |
shedding ligth on the role of the prokaryotic assemblage in the biogeochemical cycles of the dark ocean |
publisher |
Universidad de Las Palmas de Gran Canaria |
publishDate |
2010 |
url |
http://hdl.handle.net/10261/101845 |
long_lat |
ENVELOPE(-60.674,-60.674,-62.971,-62.971) |
geographic |
Las Palmas |
geographic_facet |
Las Palmas |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://hdl.handle.net/10261/101845 |
op_rights |
open |
_version_ |
1790604706725232640 |