Small phytoplankton contribute greatly to ...
Type de document :
Compte-rendu et recension critique d'ouvrage
Titre :
Small phytoplankton contribute greatly to CO2-fixation after the diatom bloom in the Southern Ocean
Auteur(s) :
Irion, Solène [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Christaki, Urania [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université du Littoral Côte d'Opale [ULCO]
Berthelot, Hugo [Auteur]
Laboratoire des Sciences de l'Environnement Marin (LEMAR) [LEMAR]
L'Helguen, Stéphane [Auteur]
Laboratoire des Sciences de l'Environnement Marin (LEMAR) [LEMAR]
Jardillier, Ludwig [Auteur]
Ecologie Systématique et Evolution [ESE]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Christaki, Urania [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Université du Littoral Côte d'Opale [ULCO]
Berthelot, Hugo [Auteur]
Laboratoire des Sciences de l'Environnement Marin (LEMAR) [LEMAR]
L'Helguen, Stéphane [Auteur]
Laboratoire des Sciences de l'Environnement Marin (LEMAR) [LEMAR]
Jardillier, Ludwig [Auteur]
Ecologie Systématique et Evolution [ESE]
Titre de la revue :
The International Society of Microbiologial Ecology Journal
Pagination :
2509-2522
Éditeur :
Nature Publishing Group
Date de publication :
2021-09
ISSN :
1751-7362
Discipline(s) HAL :
Planète et Univers [physics]/Interfaces continentales, environnement
Planète et Univers [physics]/Sciences de la Terre/Océanographie
Planète et Univers [physics]/Sciences de la Terre/Océanographie
Résumé en anglais : [en]
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, ...
Lire la suite >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.Lire moins >
Lire la suite >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.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Projet ANR :
Source :
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