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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ftunivlilleoa:oai:lilloa.univ-lille.fr:20.500.12210/83937 2023-06-18T03:43:11+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. Laboratoire d'océanographie de Villefranche LOV Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 LOG 2014 https://hdl.handle.net/20.500.12210/83937 Anglais eng 10.5194/bg-11-6841-201410.5194/bgd-11-10827-2014 Biogeosciences http://hdl.handle.net/20.500.12210/83937 info:eu-repo/semantics/closedAccess Earth Science Article dans une revue scientifique 2014 ftunivlilleoa https://doi.org/20.500.12210/83937 2023-06-07T16:11:33Z 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. 11 Article in Journal/Newspaper Southern Ocean LillOA (Lille Open Archive - Université de Lille) Southern Ocean Austral Kerguelen |
institution |
Open Polar |
collection |
LillOA (Lille Open Archive - Université de Lille) |
op_collection_id |
ftunivlilleoa |
language |
English |
topic |
Earth Science |
spellingShingle |
Earth Science 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 |
Earth Science |
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. 11 |
author2 |
Laboratoire d'océanographie de Villefranche LOV Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 LOG |
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 |
publishDate |
2014 |
url |
https://hdl.handle.net/20.500.12210/83937 |
geographic |
Southern Ocean Austral Kerguelen |
geographic_facet |
Southern Ocean Austral Kerguelen |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
10.5194/bg-11-6841-201410.5194/bgd-11-10827-2014 Biogeosciences http://hdl.handle.net/20.500.12210/83937 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/20.500.12210/83937 |
_version_ |
1769009480836579328 |