Small phytoplankton contribute greatly to CO2-fixation after the diatom bloom in the Southern Ocean
International audience Abstract Phytoplankton is composed of a broad-sized spectrum of phylogenetically diverse microorganisms. Assessing CO 2 -fixation intra- and inter-group variability is crucial in understanding how the carbon pump functions, as each group of phytoplankton may be characterized b...
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2021
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ftunivnantes:oai:HAL:hal-03272301v1 2023-05-15T18:24:48+02:00 Small phytoplankton contribute greatly to CO2-fixation after the diatom bloom in the Southern Ocean Irion, Solène Christaki, Urania Berthelot, Hugo L'Helguen, Stéphane Jardillier, Ludwig Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Ecologie Systématique et Evolution (ESE) AgroParisTech-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) 2021-03-12 https://hal-cnrs.archives-ouvertes.fr/hal-03272301 https://hal-cnrs.archives-ouvertes.fr/hal-03272301/document https://hal-cnrs.archives-ouvertes.fr/hal-03272301/file/Irion%20et%20al%202021.pdf https://doi.org/10.1038/s41396-021-00915-z en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/s41396-021-00915-z hal-03272301 https://hal-cnrs.archives-ouvertes.fr/hal-03272301 https://hal-cnrs.archives-ouvertes.fr/hal-03272301/document https://hal-cnrs.archives-ouvertes.fr/hal-03272301/file/Irion%20et%20al%202021.pdf doi:10.1038/s41396-021-00915-z info:eu-repo/semantics/OpenAccess ISSN: 1751-7362 EISSN: 1751-7370 ISME Journal https://hal-cnrs.archives-ouvertes.fr/hal-03272301 ISME Journal, 2021, ⟨10.1038/s41396-021-00915-z⟩ [SDE]Environmental Sciences [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2021 ftunivnantes https://doi.org/10.1038/s41396-021-00915-z 2023-02-22T03:15:13Z International audience Abstract Phytoplankton is composed of a broad-sized spectrum of phylogenetically diverse microorganisms. Assessing CO 2 -fixation intra- and inter-group variability is crucial in understanding how the carbon pump functions, as each group of phytoplankton may be characterized by diverse efficiencies in carbon fixation and export to the deep ocean. We measured the CO 2 -fixation of different groups of phytoplankton at the single-cell level around the naturally iron-fertilized Kerguelen plateau (Southern Ocean), known for intense diatoms blooms suspected to enhance CO 2 sequestration. After the bloom, small cells (<20 µm) composed of phylogenetically distant taxa (prymnesiophytes, prasinophytes, and small diatoms) were growing faster (0.37 ± 0.13 and 0.22 ± 0.09 division d −1 on- and off-plateau, respectively) than larger diatoms (0.11 ± 0.14 and 0.09 ± 0.11 division d −1 on- and off-plateau, respectively), which showed heterogeneous growth and a large proportion of inactive cells (19 ± 13%). As a result, small phytoplankton contributed to a large proportion of the CO 2 fixation (41–70%). The analysis of pigment vertical distribution indicated that grazing may be an important pathway of small phytoplankton export. Overall, this study highlights the need to further explore the role of small cells in CO 2 -fixation and export in the Southern Ocean. Article in Journal/Newspaper Southern Ocean Université de Nantes: HAL-UNIV-NANTES Kerguelen Southern Ocean The ISME Journal 15 9 2509 2522 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDE]Environmental Sciences [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDE]Environmental Sciences [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Irion, Solène Christaki, Urania Berthelot, Hugo L'Helguen, Stéphane Jardillier, Ludwig Small phytoplankton contribute greatly to CO2-fixation after the diatom bloom in the Southern Ocean |
topic_facet |
[SDE]Environmental Sciences [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience Abstract Phytoplankton is composed of a broad-sized spectrum of phylogenetically diverse microorganisms. Assessing CO 2 -fixation intra- and inter-group variability is crucial in understanding how the carbon pump functions, as each group of phytoplankton may be characterized by diverse efficiencies in carbon fixation and export to the deep ocean. We measured the CO 2 -fixation of different groups of phytoplankton at the single-cell level around the naturally iron-fertilized Kerguelen plateau (Southern Ocean), known for intense diatoms blooms suspected to enhance CO 2 sequestration. After the bloom, small cells (<20 µm) composed of phylogenetically distant taxa (prymnesiophytes, prasinophytes, and small diatoms) were growing faster (0.37 ± 0.13 and 0.22 ± 0.09 division d −1 on- and off-plateau, respectively) than larger diatoms (0.11 ± 0.14 and 0.09 ± 0.11 division d −1 on- and off-plateau, respectively), which showed heterogeneous growth and a large proportion of inactive cells (19 ± 13%). As a result, small phytoplankton contributed to a large proportion of the CO 2 fixation (41–70%). The analysis of pigment vertical distribution indicated that grazing may be an important pathway of small phytoplankton export. Overall, this study highlights the need to further explore the role of small cells in CO 2 -fixation and export in the Southern Ocean. |
author2 |
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Ecologie Systématique et Evolution (ESE) AgroParisTech-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Irion, Solène Christaki, Urania Berthelot, Hugo L'Helguen, Stéphane Jardillier, Ludwig |
author_facet |
Irion, Solène Christaki, Urania Berthelot, Hugo L'Helguen, Stéphane Jardillier, Ludwig |
author_sort |
Irion, Solène |
title |
Small phytoplankton contribute greatly to CO2-fixation after the diatom bloom in the Southern Ocean |
title_short |
Small phytoplankton contribute greatly to CO2-fixation after the diatom bloom in the Southern Ocean |
title_full |
Small phytoplankton contribute greatly to CO2-fixation after the diatom bloom in the Southern Ocean |
title_fullStr |
Small phytoplankton contribute greatly to CO2-fixation after the diatom bloom in the Southern Ocean |
title_full_unstemmed |
Small phytoplankton contribute greatly to CO2-fixation after the diatom bloom in the Southern Ocean |
title_sort |
small phytoplankton contribute greatly to co2-fixation after the diatom bloom in the southern ocean |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal-cnrs.archives-ouvertes.fr/hal-03272301 https://hal-cnrs.archives-ouvertes.fr/hal-03272301/document https://hal-cnrs.archives-ouvertes.fr/hal-03272301/file/Irion%20et%20al%202021.pdf https://doi.org/10.1038/s41396-021-00915-z |
geographic |
Kerguelen Southern Ocean |
geographic_facet |
Kerguelen Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 1751-7362 EISSN: 1751-7370 ISME Journal https://hal-cnrs.archives-ouvertes.fr/hal-03272301 ISME Journal, 2021, ⟨10.1038/s41396-021-00915-z⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41396-021-00915-z hal-03272301 https://hal-cnrs.archives-ouvertes.fr/hal-03272301 https://hal-cnrs.archives-ouvertes.fr/hal-03272301/document https://hal-cnrs.archives-ouvertes.fr/hal-03272301/file/Irion%20et%20al%202021.pdf doi:10.1038/s41396-021-00915-z |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1038/s41396-021-00915-z |
container_title |
The ISME Journal |
container_volume |
15 |
container_issue |
9 |
container_start_page |
2509 |
op_container_end_page |
2522 |
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1766205722990739456 |