FN Archimer Export Format
PT J
TI Small phytoplankton contribute greatly to CO2-fixation after the diatom bloom in the Southern Ocean
BT 
AF Irion, Solène
   Christaki, Urania
   Berthelot, Hugo
   L’Helguen, Stéphane
   Jardillier, Ludwig
AS 1:1;2:1;3:4;4:2;5:3;
FF 1:;2:;3:;4:;5:;
C1 Université Littoral Côte d’Opale - ULCO, CNRS, Université Lille, UMR 8187 - LOG - Laboratoire d’Océanologie et de Géosciences, F-62930, Wimereux, France
   Laboratoire des Sciences de l’Environnement Marin (LEMAR), UMR 6539 UBO/CNRS/IRD/IFREMER, Institut Universitaire Européen de la Mer (IUEM), Brest, France
   Ecologie Systématique Evolution, Université Paris-Saclay, Centre National de la Recherche Scientifique - CNRS, AgroParisTech, Orsay, France
   Laboratoire des Sciences de l’Environnement Marin (LEMAR), UMR 6539 UBO/CNRS/IRD/IFREMER, Institut Universitaire Européen de la Mer (IUEM), Brest, France
C2 UNIV LITTORAL COTE D'OPALE, FRANCE
   CNRS, FRANCE
   CNRS, FRANCE
   UBO, FRANCE
UM LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
IF 11.217
TC 19
UR https://archimer.ifremer.fr/doc/00684/79595/82286.pdf
   https://archimer.ifremer.fr/doc/00684/79595/82287.pdf
LA English
DT Article
CR MD 145 / KEOPS
   MD 188 / KEOPS 2
   MOBYDICK-THEMISTO
BO Marion Dufresne
AB Phytoplankton is composed of a broad-sized spectrum of phylogenetically diverse microorganisms. Assessing CO2-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 CO2-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 CO2 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 CO2 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 CO2-fixation and export in the Southern Ocean. 
PY 2021
PD SEP
SO Isme Journal
SN 1751-7362
PU Springer Science and Business Media LLC
VL 15
IS 9
UT 000628143100005
BP 2509
EP 2522
DI 10.1038/s41396-021-00915-z
ID 79595
ER

EF