Fronts divide diazotroph communities in the Southern Indian Ocean
International audience Dinitrogen (N2) fixation represents a key source of reactive nitrogen in marine ecosystems. While the process has been rather well-explored in low latitudes of the Atlantic and Pacific Oceans, other higher latitude regions and particularly the Indian Ocean have been chronicall...
Main Authors: | , , , , , , , , , , , , |
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Other Authors: | , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2024
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Subjects: | |
Online Access: | https://hal.univ-brest.fr/hal-04674525 https://hal.univ-brest.fr/hal-04674525/document https://hal.univ-brest.fr/hal-04674525/file/fiae095.pdf https://doi.org/10.1093/femsec/fiae095Advance |
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ftanrparis:oai:HAL:hal-04674525v1 |
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openpolar |
institution |
Open Polar |
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Portail HAL-ANR (Agence Nationale de la Recherche) |
op_collection_id |
ftanrparis |
language |
English |
topic |
fronts HNLC N 2 fixation noncyanobacterial diazotrophs subtropical gyre trace metals fronts HNLC N 2 fixation noncyanobacterial diazotrophs subtropical gyre trace metals [SDE]Environmental Sciences |
spellingShingle |
fronts HNLC N 2 fixation noncyanobacterial diazotrophs subtropical gyre trace metals fronts HNLC N 2 fixation noncyanobacterial diazotrophs subtropical gyre trace metals [SDE]Environmental Sciences Chowdhury, Subhadeep Berthelot, Hugo Baudet, Corentin González-Santana, David Reeder, Christian, Furbo l'Helguen, Stéphane Maguer, Jean-François Löscher, Carolin, R Singh, Arvind Blain, Stéphane Cassar, Nicolas Bonnet, Sophie Planquette, Hélène Fronts divide diazotroph communities in the Southern Indian Ocean |
topic_facet |
fronts HNLC N 2 fixation noncyanobacterial diazotrophs subtropical gyre trace metals fronts HNLC N 2 fixation noncyanobacterial diazotrophs subtropical gyre trace metals [SDE]Environmental Sciences |
description |
International audience Dinitrogen (N2) fixation represents a key source of reactive nitrogen in marine ecosystems. While the process has been rather well-explored in low latitudes of the Atlantic and Pacific Oceans, other higher latitude regions and particularly the Indian Ocean have been chronically overlooked. Here, we characterize N2 fixation and diazotroph community composition across nutrient and trace metals gradients spanning the multifrontal system separating the oligotrophic waters of the Indian Ocean subtropical gyre from the high nutrient low chlorophyll waters of the Southern Ocean. We found a sharp contrasting distribution of diazotroph groups across the frontal system. Notably, cyanobacterial diazotrophs dominated north of fronts, driving high N2 fixation rates (up to 13.96 nmol N l−1 d−1) with notable peaks near the South African coast. South of the fronts non-cyanobacterial diazotrophs prevailed without significant N2 fixation activity being detected. Our results provide new crucial insights into high latitude diazotrophy in the Indian Ocean, which should contribute to improved climate model parameterization and enhanced constraints on global net primary productivity projections. © The Author(s) 2024. |
author2 |
Institut Pythéas (OSU PYTHEAS) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Unité Dynamiques des Écosystèmes Côtiers (DYNECO) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) 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) Nicholas School of the Environment Duke University Durham Instituto de Oceanografía y Cambio Global (IOCAG) Université de Las Palmas de Gran Canaria Espagne (ULPGC) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) University of Southern Denmark (SDU) Physical Research Laboratory Ahmedabad (PRL) Indian Space Research Organisation (ISRO) 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) ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) |
format |
Article in Journal/Newspaper |
author |
Chowdhury, Subhadeep Berthelot, Hugo Baudet, Corentin González-Santana, David Reeder, Christian, Furbo l'Helguen, Stéphane Maguer, Jean-François Löscher, Carolin, R Singh, Arvind Blain, Stéphane Cassar, Nicolas Bonnet, Sophie Planquette, Hélène |
author_facet |
Chowdhury, Subhadeep Berthelot, Hugo Baudet, Corentin González-Santana, David Reeder, Christian, Furbo l'Helguen, Stéphane Maguer, Jean-François Löscher, Carolin, R Singh, Arvind Blain, Stéphane Cassar, Nicolas Bonnet, Sophie Planquette, Hélène |
author_sort |
Chowdhury, Subhadeep |
title |
Fronts divide diazotroph communities in the Southern Indian Ocean |
title_short |
Fronts divide diazotroph communities in the Southern Indian Ocean |
title_full |
Fronts divide diazotroph communities in the Southern Indian Ocean |
title_fullStr |
Fronts divide diazotroph communities in the Southern Indian Ocean |
title_full_unstemmed |
Fronts divide diazotroph communities in the Southern Indian Ocean |
title_sort |
fronts divide diazotroph communities in the southern indian ocean |
publisher |
HAL CCSD |
publishDate |
2024 |
url |
https://hal.univ-brest.fr/hal-04674525 https://hal.univ-brest.fr/hal-04674525/document https://hal.univ-brest.fr/hal-04674525/file/fiae095.pdf https://doi.org/10.1093/femsec/fiae095Advance |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 0168-6496 EISSN: 1574-6941 FEMS Microbiology Ecology https://hal.univ-brest.fr/hal-04674525 FEMS Microbiology Ecology, 2024, 100 (8), pp.fiae095. ⟨10.1093/femsec/fiae095Advance⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/femsec/fiae095Advance hal-04674525 https://hal.univ-brest.fr/hal-04674525 https://hal.univ-brest.fr/hal-04674525/document https://hal.univ-brest.fr/hal-04674525/file/fiae095.pdf doi:10.1093/femsec/fiae095Advance |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1093/femsec/fiae095Advance |
_version_ |
1810481609580740608 |
spelling |
ftanrparis:oai:HAL:hal-04674525v1 2024-09-15T18:37:15+00:00 Fronts divide diazotroph communities in the Southern Indian Ocean Chowdhury, Subhadeep Berthelot, Hugo Baudet, Corentin González-Santana, David Reeder, Christian, Furbo l'Helguen, Stéphane Maguer, Jean-François Löscher, Carolin, R Singh, Arvind Blain, Stéphane Cassar, Nicolas Bonnet, Sophie Planquette, Hélène Institut Pythéas (OSU PYTHEAS) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Unité Dynamiques des Écosystèmes Côtiers (DYNECO) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) 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) Nicholas School of the Environment Duke University Durham Instituto de Oceanografía y Cambio Global (IOCAG) Université de Las Palmas de Gran Canaria Espagne (ULPGC) Institut méditerranéen d'océanologie (MIO) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS) University of Southern Denmark (SDU) Physical Research Laboratory Ahmedabad (PRL) Indian Space Research Organisation (ISRO) 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) ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017) 2024-08-01 https://hal.univ-brest.fr/hal-04674525 https://hal.univ-brest.fr/hal-04674525/document https://hal.univ-brest.fr/hal-04674525/file/fiae095.pdf https://doi.org/10.1093/femsec/fiae095Advance en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1093/femsec/fiae095Advance hal-04674525 https://hal.univ-brest.fr/hal-04674525 https://hal.univ-brest.fr/hal-04674525/document https://hal.univ-brest.fr/hal-04674525/file/fiae095.pdf doi:10.1093/femsec/fiae095Advance info:eu-repo/semantics/OpenAccess ISSN: 0168-6496 EISSN: 1574-6941 FEMS Microbiology Ecology https://hal.univ-brest.fr/hal-04674525 FEMS Microbiology Ecology, 2024, 100 (8), pp.fiae095. ⟨10.1093/femsec/fiae095Advance⟩ fronts HNLC N 2 fixation noncyanobacterial diazotrophs subtropical gyre trace metals fronts HNLC N 2 fixation noncyanobacterial diazotrophs subtropical gyre trace metals [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2024 ftanrparis https://doi.org/10.1093/femsec/fiae095Advance 2024-08-28T23:59:03Z International audience Dinitrogen (N2) fixation represents a key source of reactive nitrogen in marine ecosystems. While the process has been rather well-explored in low latitudes of the Atlantic and Pacific Oceans, other higher latitude regions and particularly the Indian Ocean have been chronically overlooked. Here, we characterize N2 fixation and diazotroph community composition across nutrient and trace metals gradients spanning the multifrontal system separating the oligotrophic waters of the Indian Ocean subtropical gyre from the high nutrient low chlorophyll waters of the Southern Ocean. We found a sharp contrasting distribution of diazotroph groups across the frontal system. Notably, cyanobacterial diazotrophs dominated north of fronts, driving high N2 fixation rates (up to 13.96 nmol N l−1 d−1) with notable peaks near the South African coast. South of the fronts non-cyanobacterial diazotrophs prevailed without significant N2 fixation activity being detected. Our results provide new crucial insights into high latitude diazotrophy in the Indian Ocean, which should contribute to improved climate model parameterization and enhanced constraints on global net primary productivity projections. © The Author(s) 2024. Article in Journal/Newspaper Southern Ocean Portail HAL-ANR (Agence Nationale de la Recherche) |