Enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the Kerguelen Plateau
Above the Kerguelen Plateau in the Southern Ocean natural iron fertilization sustains a large phytoplankton bloom over 3 months during austral summer. During the KEOPS1 project (KErguelen Ocean and Plateau compared Study1) we sampled this phytoplankton bloom during its declining phase along with the...
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ftconicet:oai:ri.conicet.gov.ar:11336/6858 2023-10-09T21:56:03+02:00 Enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the Kerguelen Plateau Malits, Andrea Christaki, U. Obernosterer, I. Weinbauer, M. G. application/pdf http://hdl.handle.net/11336/6858 eng eng Copernicus Publications info:eu-repo/semantics/altIdentifier/url/http://www.biogeosciences.net/11/6841/2014/ info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-11-6841-2014 info:eu-repo/semantics/altIdentifier/doi/ http://hdl.handle.net/11336/6858 Malits, Andrea; Christaki, U.; Obernosterer, I.; Weinbauer, M. G. Enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the Kerguelen Plateau; Copernicus Publications; Biogeosciences; 11; 12-2014; 6841-6853 1726-4170 1726-4189 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/2.5/ar/ Fe-fertilization viral mediated mortality cycling of organic carbon https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.5194/bg-11-6841-2014 2023-09-24T19:26:48Z Above the Kerguelen Plateau in the Southern Ocean natural iron fertilization sustains a large phytoplankton bloom over 3 months during austral summer. During the KEOPS1 project (KErguelen Ocean and Plateau compared Study1) we sampled this phytoplankton bloom during its declining phase along with the surrounding high-nutrient?low-chlorophyll (HNLC) waters to study the effect of natural iron fertilization on the role of viruses in the microbial food web. Bacterial and viral abundances were 1.7 and 2.1 times, respectively, higher within the bloom than in HNLC waters. Viral production and virus-mediated mortality of bacterioplankton were 4.1 and 4.9 times, respectively, higher in the bloom, while the fraction of infected cells (FIC) and the fraction of lysogenic cells (FLC) showed no significant differences between environments. The present study suggests viruses to be more important for bacterial mortality within the bloom and dominate over grazing of heterotrophic nanoflagellates (HNFs) during the late bloom phase. As a consequence, at least at a late bloom stage, viral lysis shunts part of the photosynthetically fixed carbon in iron-fertilized regions into the dissolved organic matter (DOM) pool with potentially less particulate organic carbon transferred to larger members of the food web or exported. Fil: Malits, Andrea. Sorbonne Universités; Francia. Observatoire océanographique; Francia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Christaki, U. Université du Littoral. Laboratoire d’Océanologie et des Géosciences; Francia Fil: Obernosterer, I. Sorbonne Universités; Francia. Observatoire océanographique; Francia Fil: Weinbauer, M. G. . Sorbonne Universités; Francia. Observatoire océanographique; Francia Article in Journal/Newspaper Southern Ocean CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Southern Ocean Austral Kerguelen Argentina Biogeosciences 11 23 6841 6853 |
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Open Polar |
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CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
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ftconicet |
language |
English |
topic |
Fe-fertilization viral mediated mortality cycling of organic carbon https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
spellingShingle |
Fe-fertilization viral mediated mortality cycling of organic carbon https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 Malits, Andrea Christaki, U. Obernosterer, I. Weinbauer, M. G. Enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the Kerguelen Plateau |
topic_facet |
Fe-fertilization viral mediated mortality cycling of organic carbon https://purl.org/becyt/ford/1.5 https://purl.org/becyt/ford/1 |
description |
Above the Kerguelen Plateau in the Southern Ocean natural iron fertilization sustains a large phytoplankton bloom over 3 months during austral summer. During the KEOPS1 project (KErguelen Ocean and Plateau compared Study1) we sampled this phytoplankton bloom during its declining phase along with the surrounding high-nutrient?low-chlorophyll (HNLC) waters to study the effect of natural iron fertilization on the role of viruses in the microbial food web. Bacterial and viral abundances were 1.7 and 2.1 times, respectively, higher within the bloom than in HNLC waters. Viral production and virus-mediated mortality of bacterioplankton were 4.1 and 4.9 times, respectively, higher in the bloom, while the fraction of infected cells (FIC) and the fraction of lysogenic cells (FLC) showed no significant differences between environments. The present study suggests viruses to be more important for bacterial mortality within the bloom and dominate over grazing of heterotrophic nanoflagellates (HNFs) during the late bloom phase. As a consequence, at least at a late bloom stage, viral lysis shunts part of the photosynthetically fixed carbon in iron-fertilized regions into the dissolved organic matter (DOM) pool with potentially less particulate organic carbon transferred to larger members of the food web or exported. Fil: Malits, Andrea. Sorbonne Universités; Francia. Observatoire océanographique; Francia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina Fil: Christaki, U. Université du Littoral. Laboratoire d’Océanologie et des Géosciences; Francia Fil: Obernosterer, I. Sorbonne Universités; Francia. Observatoire océanographique; Francia Fil: Weinbauer, M. G. . Sorbonne Universités; Francia. Observatoire océanographique; Francia |
format |
Article in Journal/Newspaper |
author |
Malits, Andrea Christaki, U. Obernosterer, I. Weinbauer, M. G. |
author_facet |
Malits, Andrea Christaki, U. Obernosterer, I. Weinbauer, M. G. |
author_sort |
Malits, Andrea |
title |
Enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the Kerguelen Plateau |
title_short |
Enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the Kerguelen Plateau |
title_full |
Enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the Kerguelen Plateau |
title_fullStr |
Enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the Kerguelen Plateau |
title_full_unstemmed |
Enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the Kerguelen Plateau |
title_sort |
enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the kerguelen plateau |
publisher |
Copernicus Publications |
url |
http://hdl.handle.net/11336/6858 |
geographic |
Southern Ocean Austral Kerguelen Argentina |
geographic_facet |
Southern Ocean Austral Kerguelen Argentina |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
info:eu-repo/semantics/altIdentifier/url/http://www.biogeosciences.net/11/6841/2014/ info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-11-6841-2014 info:eu-repo/semantics/altIdentifier/doi/ http://hdl.handle.net/11336/6858 Malits, Andrea; Christaki, U.; Obernosterer, I.; Weinbauer, M. G. Enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the Kerguelen Plateau; Copernicus Publications; Biogeosciences; 11; 12-2014; 6841-6853 1726-4170 1726-4189 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/2.5/ar/ |
op_doi |
https://doi.org/10.5194/bg-11-6841-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
23 |
container_start_page |
6841 |
op_container_end_page |
6853 |
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1779320455474184192 |