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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Copernicus Publications
2014
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00018061 2023-05-15T18:25:33+02:00 Enhanced viral production and virus-mediated mortality of bacterioplankton in a natural iron-fertilized bloom event above the Kerguelen Plateau Malits, A. Christaki, U. Obernosterer, I. Weinbauer, M. G. 2014-12 electronic https://doi.org/10.5194/bg-11-6841-2014 https://noa.gwlb.de/receive/cop_mods_00018061 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00018016/bg-11-6841-2014.pdf https://bg.copernicus.org/articles/11/6841/2014/bg-11-6841-2014.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-11-6841-2014 https://noa.gwlb.de/receive/cop_mods_00018061 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00018016/bg-11-6841-2014.pdf https://bg.copernicus.org/articles/11/6841/2014/bg-11-6841-2014.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2014 ftnonlinearchiv https://doi.org/10.5194/bg-11-6841-2014 2022-02-08T22:53:23Z 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. Article in Journal/Newspaper Southern Ocean Niedersächsisches Online-Archiv NOA Austral Kerguelen Southern Ocean Biogeosciences 11 23 6841 6853 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Malits, A. 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 |
article Verlagsveröffentlichung |
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. |
format |
Article in Journal/Newspaper |
author |
Malits, A. Christaki, U. Obernosterer, I. Weinbauer, M. G. |
author_facet |
Malits, A. Christaki, U. Obernosterer, I. Weinbauer, M. G. |
author_sort |
Malits, A. |
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 |
publishDate |
2014 |
url |
https://doi.org/10.5194/bg-11-6841-2014 https://noa.gwlb.de/receive/cop_mods_00018061 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00018016/bg-11-6841-2014.pdf https://bg.copernicus.org/articles/11/6841/2014/bg-11-6841-2014.pdf |
geographic |
Austral Kerguelen Southern Ocean |
geographic_facet |
Austral Kerguelen Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-11-6841-2014 https://noa.gwlb.de/receive/cop_mods_00018061 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00018016/bg-11-6841-2014.pdf https://bg.copernicus.org/articles/11/6841/2014/bg-11-6841-2014.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
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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1766207072040386560 |