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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Published in:The ISME Journal
Main Authors: Irion, Solène, Christaki, Urania, Berthelot, Hugo, L'Helguen, Stéphane, Jardillier, Ludwig
Other Authors: 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 ), Université du Littoral Côte d'Opale (ULCO), 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), ANR-17-CE01-0013,MOBYDICK,Biodiversité des Ecosystèmes Marins et Dynamique du Carbone dans le secteur de Kerguelen : approche intégrée(2017)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2021
Subjects:
Online Access:https://cnrs.hal.science/hal-03272301
https://cnrs.hal.science/hal-03272301/document
https://cnrs.hal.science/hal-03272301/file/Irion%20et%20al%202021.pdf
https://doi.org/10.1038/s41396-021-00915-z
id ftagroparistech:oai:HAL:hal-03272301v1
record_format openpolar
institution Open Polar
collection AgroParisTech: HAL (Institut des sciences et industries du vivant et de l'environnement)
op_collection_id ftagroparistech
language English
topic [SDE]Environmental Sciences
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
spellingShingle [SDE]Environmental Sciences
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
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.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
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 )
Université du Littoral Côte d'Opale (ULCO)
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)
ANR-17-CE01-0013,MOBYDICK,Biodiversité des Ecosystèmes Marins et Dynamique du Carbone dans le secteur de Kerguelen : approche intégrée(2017)
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://cnrs.hal.science/hal-03272301
https://cnrs.hal.science/hal-03272301/document
https://cnrs.hal.science/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://cnrs.hal.science/hal-03272301
ISME Journal, 2021, 15 (9), pp.2509-2522. &#x27E8;10.1038/s41396-021-00915-z&#x27E9;
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hal-03272301
https://cnrs.hal.science/hal-03272301
https://cnrs.hal.science/hal-03272301/document
https://cnrs.hal.science/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
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spelling ftagroparistech:oai:HAL:hal-03272301v1 2024-02-11T10:08:48+01:00 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 ) Université du Littoral Côte d'Opale (ULCO) 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) ANR-17-CE01-0013,MOBYDICK,Biodiversité des Ecosystèmes Marins et Dynamique du Carbone dans le secteur de Kerguelen : approche intégrée(2017) 2021-09 https://cnrs.hal.science/hal-03272301 https://cnrs.hal.science/hal-03272301/document https://cnrs.hal.science/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://cnrs.hal.science/hal-03272301 https://cnrs.hal.science/hal-03272301/document https://cnrs.hal.science/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://cnrs.hal.science/hal-03272301 ISME Journal, 2021, 15 (9), pp.2509-2522. &#x27E8;10.1038/s41396-021-00915-z&#x27E9; [SDE]Environmental Sciences [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2021 ftagroparistech https://doi.org/10.1038/s41396-021-00915-z 2024-01-23T23:50:03Z 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 AgroParisTech: HAL (Institut des sciences et industries du vivant et de l'environnement) Kerguelen Southern Ocean The ISME Journal