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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ftpubmed:oai:pubmedcentral.nih.gov:2736376 2023-05-15T16:02:29+02:00 Major Role of Microbes in Carbon Fluxes during Austral Winter in the Southern Drake Passage Manganelli, Maura Malfatti, Francesca Samo, Ty J. Mitchell, B. Greg Wang, Haili Azam, Farooq 2009-09-14 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2736376 http://www.ncbi.nlm.nih.gov/pubmed/19759822 https://doi.org/10.1371/journal.pone.0006941 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2736376 http://www.ncbi.nlm.nih.gov/pubmed/19759822 http://dx.doi.org/10.1371/journal.pone.0006941 Manganelli et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. CC-BY Research Article Text 2009 ftpubmed https://doi.org/10.1371/journal.pone.0006941 2013-09-02T16:19:24Z 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 CO2 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 CO2. Text Drake Passage Southern Ocean PubMed Central (PMC) Austral Drake Passage Southern Ocean PLoS ONE 4 9 e6941 |
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Research Article Manganelli, Maura Malfatti, Francesca Samo, Ty J. Mitchell, B. Greg Wang, Haili Azam, Farooq Major Role of Microbes in Carbon Fluxes during Austral Winter in the Southern Drake Passage |
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Research Article |
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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 CO2 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 CO2. |
format |
Text |
author |
Manganelli, Maura Malfatti, Francesca Samo, Ty J. Mitchell, B. Greg Wang, Haili Azam, Farooq |
author_facet |
Manganelli, Maura Malfatti, Francesca Samo, Ty J. Mitchell, B. Greg Wang, Haili Azam, Farooq |
author_sort |
Manganelli, Maura |
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 |
publishDate |
2009 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2736376 http://www.ncbi.nlm.nih.gov/pubmed/19759822 https://doi.org/10.1371/journal.pone.0006941 |
geographic |
Austral Drake Passage Southern Ocean |
geographic_facet |
Austral Drake Passage Southern Ocean |
genre |
Drake Passage Southern Ocean |
genre_facet |
Drake Passage Southern Ocean |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2736376 http://www.ncbi.nlm.nih.gov/pubmed/19759822 http://dx.doi.org/10.1371/journal.pone.0006941 |
op_rights |
Manganelli et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0006941 |
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e6941 |
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