Small phytoplankton contribute greatly to ...
Document type :
Compte-rendu et recension critique d'ouvrage
Title :
Small phytoplankton contribute greatly to CO2-fixation after the diatom bloom in the Southern Ocean
Author(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]
Journal title :
The International Society of Microbiologial Ecology Journal
Pages :
2509-2522
Publisher :
Nature Publishing Group
Publication date :
2021-09
ISSN :
1751-7362
HAL domain(s) :
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
English abstract : [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, ...
Show more >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.Show less >
Show more >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.Show less >
Language :
Anglais
Popular science :
Non
ANR Project :
Source :
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