FN Archimer Export Format
PT J
TI Diazotrophs are overlooked contributors to carbon and nitrogen export to the deep ocean
BT 
AF Bonnet, Sophie
   Benavides, Mar
   Le Moigne, Frédéric A. C.
   Camps, Mercedes
   Torremocha, Antoine
   Grosso, Olivier
   Dimier, Céline
   Spungin, Dina
   Berman-Frank, Ilana
   Garczarek, Laurence
   Cornejo-Castillo, Francisco M.
AS 1:1;2:1,2;3:1,3;4:1;5:1;6:1;7:4;8:5;9:5;10:6;11:6,7;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;
C1 Aix Marseille University, Université de Toulon, CNRS, IRD, MIO UM 110, 13288, Marseille, France
   Turing Center for Living Systems, Aix-Marseille University, 13009, Marseille, France
   LEMAR, Laboratoire des sciences de l’environnement marin, UMR6539, CNRS, UBO, IFREMER, IRD, 29280, Plouzané, Technopôle Brest-Iroise, France
   Laboratoire d’Océanographie de Villefranche (LOV), Sorbonne Université, CNRS, 06230, Villefranche sur mer, France
   University of Haifa, The Leon H. Charney School of Marine Sciences, Haifa, 3498838, Israel
   Sorbonne Université, CNRS, UMR 7144 Adaptation and Diversity in the Marine Environment (AD2M), Station Biologique de Roscoff (SBR), Roscoff, France
   Institut de Ciènces del Mar (ICM-CSIC), E08003, Barcelona, Spain
C2 UNIV AIX MARSEILLE, FRANCE
   UNIV AIX MARSEILLE, FRANCE
   CNRS, FRANCE
   UNIV SORBONNE, FRANCE
   UNIV HAIFA, ISRAEL
   UNIV SORBONNE, FRANCE
   ICM-CSIC, SPAIN
UM LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 11
TC 13
UR https://archimer.ifremer.fr/doc/00795/90702/96283.pdf
   https://archimer.ifremer.fr/doc/00795/90702/96284.pdf
   https://archimer.ifremer.fr/doc/00795/90702/96285.xlsx
   https://archimer.ifremer.fr/doc/00795/90702/96286.xlsx
   https://archimer.ifremer.fr/doc/00795/90702/96287.xlsx
   https://archimer.ifremer.fr/doc/00795/90702/96289.xlsx
LA English
DT Article
CR TONGA 2019
BO L'Atalante
AB Diazotrophs are widespread microorganisms that alleviate nitrogen limitation in 60% of our oceans, thereby regulating marine productivity. Yet, the group-specific contribution of diazotrophs to organic matter export has not been quantified, which so far has impeded an accurate assessment of their impact on the biological carbon pump. Here, we examine the fate of five groups of globally-distributed diazotrophs by using an original combination of mesopelagic particle sampling devices across the subtropical South Pacific Ocean. We demonstrate that cyanobacterial and non-cyanobacterial diazotrophs are exported down to 1000 m depth. Surprisingly, group-specific export turnover rates point to a more efficient export of small unicellular cyanobacterial diazotrophs (UCYN) relative to the larger and filamentous Trichodesmium. Phycoerythrin-containing UCYN-B and UCYN-C-like cells were recurrently found embedded in large (>50 µm) organic aggregates or organized into clusters of tens to hundreds of cells linked by an extracellular matrix, presumably facilitating their export. Beyond the South Pacific, our data are supported by analysis of the Tara Oceans metagenomes collected in other ocean basins, extending the scope of our results globally. We show that, when diazotrophs are found in the euphotic zone, they are also systematically present in mesopelagic waters, suggesting their transport to the deep ocean. We thus conclude that diazotrophs are a significant part of the carbon sequestered in the deep ocean and, therefore, they need to be accounted in regional and global estimates of export. 
PY 2023
PD JAN
SO Isme Journal
SN 1751-7362
PU Springer Science and Business Media LLC
VL 17
IS 1
UT 000859884000001
BP 47
EP 58
DI 10.1038/s41396-022-01319-3
ID 90702
ER

EF