Microbial Competition in the Subpolar Southern Ocean: An Fe–C Co-limitation Experiment
International audience Iron (Fe) is a paradox in the modern ocean-it is central to many life-critical enzymes but is scarce across most surface waters. The high cellular demand and low bioavailability of Fe likely puts selective pressure on marine microorganisms. Previous observations suggest that h...
Published in: | Frontiers in Marine Science |
---|---|
Main Authors: | , , , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2020
|
Subjects: | |
Online Access: | https://hal-cnrs.archives-ouvertes.fr/hal-03831171 https://hal-cnrs.archives-ouvertes.fr/hal-03831171/document https://hal-cnrs.archives-ouvertes.fr/hal-03831171/file/Fourquez%20et%20al.%202020.pdf https://doi.org/10.3389/fmars.2019.00776 |
id |
ftccsdartic:oai:HAL:hal-03831171v1 |
---|---|
record_format |
openpolar |
spelling |
ftccsdartic:oai:HAL:hal-03831171v1 2023-05-15T18:24:26+02:00 Microbial Competition in the Subpolar Southern Ocean: An Fe–C Co-limitation Experiment Fourquez, Marion Bressac, Matthieu Deppeler, Stacy, Ellwood, Michael Obernosterer, Ingrid Trull, Thomas, Boyd, Philip University of Tasmania Hobart, Australia (UTAS) Université de Genève = University of Geneva (UNIGE) National Institute of Water and Atmospheric Research Wellington (NIWA) Australian National University (ANU) Laboratoire d'Océanographie Microbienne (LOMIC) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Banyuls (OOB) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) 2020 https://hal-cnrs.archives-ouvertes.fr/hal-03831171 https://hal-cnrs.archives-ouvertes.fr/hal-03831171/document https://hal-cnrs.archives-ouvertes.fr/hal-03831171/file/Fourquez%20et%20al.%202020.pdf https://doi.org/10.3389/fmars.2019.00776 en eng HAL CCSD Frontiers Media info:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2019.00776 hal-03831171 https://hal-cnrs.archives-ouvertes.fr/hal-03831171 https://hal-cnrs.archives-ouvertes.fr/hal-03831171/document https://hal-cnrs.archives-ouvertes.fr/hal-03831171/file/Fourquez%20et%20al.%202020.pdf doi:10.3389/fmars.2019.00776 info:eu-repo/semantics/OpenAccess ISSN: 2296-7745 Frontiers in Marine Science https://hal-cnrs.archives-ouvertes.fr/hal-03831171 Frontiers in Marine Science, 2020, 6, pp.776. ⟨10.3389/fmars.2019.00776⟩ iron carbon Southern Ocean competition heterotrophic bacteria pico-nanoplankton Fe uptake bacterial production [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology [SDE]Environmental Sciences [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2020 ftccsdartic https://doi.org/10.3389/fmars.2019.00776 2023-01-28T23:43:45Z International audience Iron (Fe) is a paradox in the modern ocean-it is central to many life-critical enzymes but is scarce across most surface waters. The high cellular demand and low bioavailability of Fe likely puts selective pressure on marine microorganisms. Previous observations suggest that heterotrophic bacteria are outcompeted by small diatoms for Fe supply in the subantarctic zone of Southern Ocean, thereby challenging the idea of heterotrophic bacteria being more competitive than phytoplankton in the access to this trace metal. To test this hypothesis, incubation experiments were carried out at the Southern Ocean Time Series site (March-April 2016). We investigated (a) whether dissolved organic carbon (DOC), dissolved Fe, or both limit the growth of heterotrophic bacteria and, (b) if the presence of potential competitors has consequences on the bacterial Fe acquisition. We observed a pronounced increase in both bulk and cell-specific bacterial production in response to single (+C) and combined (+Fe+C) additions, but no changes in these rates when only Fe was added (+Fe). Moreover, we found that +Fe+C additions promoted increases in cell-specific bacterial Fe uptake rates, and these increases were particularly pronounced (by 13-fold) when phytoplankton were excluded from the incubations. These results suggest that auto-and heterotrophs could compete for Fe when DOC limitation of bacterial growth is alleviated. Such interactions between primary producers and nutrient-recyclers are unexpected drivers for the duration and magnitude of phytoplankton blooms in the Southern Ocean. Article in Journal/Newspaper Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Southern Ocean Frontiers in Marine Science 6 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
iron carbon Southern Ocean competition heterotrophic bacteria pico-nanoplankton Fe uptake bacterial production [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology [SDE]Environmental Sciences [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
iron carbon Southern Ocean competition heterotrophic bacteria pico-nanoplankton Fe uptake bacterial production [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology [SDE]Environmental Sciences [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Fourquez, Marion Bressac, Matthieu Deppeler, Stacy, Ellwood, Michael Obernosterer, Ingrid Trull, Thomas, Boyd, Philip Microbial Competition in the Subpolar Southern Ocean: An Fe–C Co-limitation Experiment |
topic_facet |
iron carbon Southern Ocean competition heterotrophic bacteria pico-nanoplankton Fe uptake bacterial production [SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology [SDE]Environmental Sciences [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Iron (Fe) is a paradox in the modern ocean-it is central to many life-critical enzymes but is scarce across most surface waters. The high cellular demand and low bioavailability of Fe likely puts selective pressure on marine microorganisms. Previous observations suggest that heterotrophic bacteria are outcompeted by small diatoms for Fe supply in the subantarctic zone of Southern Ocean, thereby challenging the idea of heterotrophic bacteria being more competitive than phytoplankton in the access to this trace metal. To test this hypothesis, incubation experiments were carried out at the Southern Ocean Time Series site (March-April 2016). We investigated (a) whether dissolved organic carbon (DOC), dissolved Fe, or both limit the growth of heterotrophic bacteria and, (b) if the presence of potential competitors has consequences on the bacterial Fe acquisition. We observed a pronounced increase in both bulk and cell-specific bacterial production in response to single (+C) and combined (+Fe+C) additions, but no changes in these rates when only Fe was added (+Fe). Moreover, we found that +Fe+C additions promoted increases in cell-specific bacterial Fe uptake rates, and these increases were particularly pronounced (by 13-fold) when phytoplankton were excluded from the incubations. These results suggest that auto-and heterotrophs could compete for Fe when DOC limitation of bacterial growth is alleviated. Such interactions between primary producers and nutrient-recyclers are unexpected drivers for the duration and magnitude of phytoplankton blooms in the Southern Ocean. |
author2 |
University of Tasmania Hobart, Australia (UTAS) Université de Genève = University of Geneva (UNIGE) National Institute of Water and Atmospheric Research Wellington (NIWA) Australian National University (ANU) Laboratoire d'Océanographie Microbienne (LOMIC) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Observatoire océanologique de Banyuls (OOB) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Fourquez, Marion Bressac, Matthieu Deppeler, Stacy, Ellwood, Michael Obernosterer, Ingrid Trull, Thomas, Boyd, Philip |
author_facet |
Fourquez, Marion Bressac, Matthieu Deppeler, Stacy, Ellwood, Michael Obernosterer, Ingrid Trull, Thomas, Boyd, Philip |
author_sort |
Fourquez, Marion |
title |
Microbial Competition in the Subpolar Southern Ocean: An Fe–C Co-limitation Experiment |
title_short |
Microbial Competition in the Subpolar Southern Ocean: An Fe–C Co-limitation Experiment |
title_full |
Microbial Competition in the Subpolar Southern Ocean: An Fe–C Co-limitation Experiment |
title_fullStr |
Microbial Competition in the Subpolar Southern Ocean: An Fe–C Co-limitation Experiment |
title_full_unstemmed |
Microbial Competition in the Subpolar Southern Ocean: An Fe–C Co-limitation Experiment |
title_sort |
microbial competition in the subpolar southern ocean: an fe–c co-limitation experiment |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://hal-cnrs.archives-ouvertes.fr/hal-03831171 https://hal-cnrs.archives-ouvertes.fr/hal-03831171/document https://hal-cnrs.archives-ouvertes.fr/hal-03831171/file/Fourquez%20et%20al.%202020.pdf https://doi.org/10.3389/fmars.2019.00776 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 2296-7745 Frontiers in Marine Science https://hal-cnrs.archives-ouvertes.fr/hal-03831171 Frontiers in Marine Science, 2020, 6, pp.776. ⟨10.3389/fmars.2019.00776⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3389/fmars.2019.00776 hal-03831171 https://hal-cnrs.archives-ouvertes.fr/hal-03831171 https://hal-cnrs.archives-ouvertes.fr/hal-03831171/document https://hal-cnrs.archives-ouvertes.fr/hal-03831171/file/Fourquez%20et%20al.%202020.pdf doi:10.3389/fmars.2019.00776 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3389/fmars.2019.00776 |
container_title |
Frontiers in Marine Science |
container_volume |
6 |
_version_ |
1766204928414449664 |