Major role of microbes in carbon fluxes during Austral winter in the Southern Drake Passage.
Carbon cycling in Southern Ocean is a major issue in climate change, hence the need to understand the role of biota in the regulation of carbon fixation and cycling. Southern Ocean is a heterogeneous system, characterized by a strong seasonality, due to long dark winter. Yet, currently little is kno...
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ftdoajarticles:oai:doaj.org/article:3c3a8f6fedf740c997114155d17b577d 2023-05-15T16:02:29+02:00 Major role of microbes in carbon fluxes during Austral winter in the Southern Drake Passage. Maura Manganelli Francesca Malfatti Ty J Samo B Greg Mitchell Haili Wang Farooq Azam 2009-09-01T00:00:00Z https://doi.org/10.1371/journal.pone.0006941 https://doaj.org/article/3c3a8f6fedf740c997114155d17b577d EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC2736376?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0006941 https://doaj.org/article/3c3a8f6fedf740c997114155d17b577d PLoS ONE, Vol 4, Iss 9, p e6941 (2009) Medicine R Science Q article 2009 ftdoajarticles https://doi.org/10.1371/journal.pone.0006941 2022-12-31T08:13:49Z Carbon cycling in Southern Ocean is a major issue in climate change, hence the need to understand the role of biota in the regulation of carbon fixation and cycling. Southern Ocean is a heterogeneous system, characterized by a strong seasonality, due to long dark winter. Yet, currently little is known about biogeochemical dynamics during this season, particularly in the deeper part of the ocean. We studied bacterial communities and processes in summer and winter cruises in the southern Drake Passage. Here we show that in winter, when the primary production is greatly reduced, Bacteria and Archaea become the major producers of biogenic particles, at the expense of dissolved organic carbon drawdown. Heterotrophic production and chemoautotrophic CO(2) fixation rates were substantial, also in deep water, and bacterial populations were controlled by protists and viruses. A dynamic food web is also consistent with the observed temporal and spatial variations in archaeal and bacterial communities that might exploit various niches. Thus, Southern Ocean microbial loop may substantially maintain a wintertime food web and system respiration at the expense of summer produced DOC as well as regenerate nutrients and iron. Our findings have important implications for Southern Ocean ecosystem functioning and carbon cycle and its manipulation by iron enrichment to achieve net sequestration of atmospheric CO(2). Article in Journal/Newspaper Drake Passage Southern Ocean Directory of Open Access Journals: DOAJ Articles Southern Ocean Austral Drake Passage PLoS ONE 4 9 e6941 |
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Directory of Open Access Journals: DOAJ Articles |
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language |
English |
topic |
Medicine R Science Q |
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Medicine R Science Q Maura Manganelli Francesca Malfatti Ty J Samo B Greg Mitchell Haili Wang Farooq Azam Major role of microbes in carbon fluxes during Austral winter in the Southern Drake Passage. |
topic_facet |
Medicine R Science Q |
description |
Carbon cycling in Southern Ocean is a major issue in climate change, hence the need to understand the role of biota in the regulation of carbon fixation and cycling. Southern Ocean is a heterogeneous system, characterized by a strong seasonality, due to long dark winter. Yet, currently little is known about biogeochemical dynamics during this season, particularly in the deeper part of the ocean. We studied bacterial communities and processes in summer and winter cruises in the southern Drake Passage. Here we show that in winter, when the primary production is greatly reduced, Bacteria and Archaea become the major producers of biogenic particles, at the expense of dissolved organic carbon drawdown. Heterotrophic production and chemoautotrophic CO(2) fixation rates were substantial, also in deep water, and bacterial populations were controlled by protists and viruses. A dynamic food web is also consistent with the observed temporal and spatial variations in archaeal and bacterial communities that might exploit various niches. Thus, Southern Ocean microbial loop may substantially maintain a wintertime food web and system respiration at the expense of summer produced DOC as well as regenerate nutrients and iron. Our findings have important implications for Southern Ocean ecosystem functioning and carbon cycle and its manipulation by iron enrichment to achieve net sequestration of atmospheric CO(2). |
format |
Article in Journal/Newspaper |
author |
Maura Manganelli Francesca Malfatti Ty J Samo B Greg Mitchell Haili Wang Farooq Azam |
author_facet |
Maura Manganelli Francesca Malfatti Ty J Samo B Greg Mitchell Haili Wang Farooq Azam |
author_sort |
Maura Manganelli |
title |
Major role of microbes in carbon fluxes during Austral winter in the Southern Drake Passage. |
title_short |
Major role of microbes in carbon fluxes during Austral winter in the Southern Drake Passage. |
title_full |
Major role of microbes in carbon fluxes during Austral winter in the Southern Drake Passage. |
title_fullStr |
Major role of microbes in carbon fluxes during Austral winter in the Southern Drake Passage. |
title_full_unstemmed |
Major role of microbes in carbon fluxes during Austral winter in the Southern Drake Passage. |
title_sort |
major role of microbes in carbon fluxes during austral winter in the southern drake passage. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2009 |
url |
https://doi.org/10.1371/journal.pone.0006941 https://doaj.org/article/3c3a8f6fedf740c997114155d17b577d |
geographic |
Southern Ocean Austral Drake Passage |
geographic_facet |
Southern Ocean Austral Drake Passage |
genre |
Drake Passage Southern Ocean |
genre_facet |
Drake Passage Southern Ocean |
op_source |
PLoS ONE, Vol 4, Iss 9, p e6941 (2009) |
op_relation |
http://europepmc.org/articles/PMC2736376?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0006941 https://doaj.org/article/3c3a8f6fedf740c997114155d17b577d |
op_doi |
https://doi.org/10.1371/journal.pone.0006941 |
container_title |
PLoS ONE |
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4 |
container_issue |
9 |
container_start_page |
e6941 |
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1766398143678644224 |