FN Archimer Export Format
PT J
TI Sinking Trichodesmium fixes nitrogen in the dark ocean
BT 
AF Benavides, Mar
   Bonnet, Sophie
   Le Moigne, Frédéric A. C.
   Armin, Gabrielle
   Inomura, Keisuke
   Hallstrøm, Søren
   Riemann, Lasse
   Berman-Frank, Ilana
   Poletti, Emilie
   Garel, Marc
   Grosso, Olivier
   Leblanc, Karine
   Guigue, Catherine
   Tedetti, Marc
   Dupouy, Cécile
AS 1:1,2;2:1;3:1,3;4:4;5:4;6:5;7:5;8:6;9:1;10:1;11:1;12:1;13:1;14:1;15:;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;
C1 Aix Marseille Univ, 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
   Graduate School of Oceanography, University of Rhode Island, South Kingstown, RI, USA
   Marine Biological Section, Department of Biology, University of Copenhagen, Helsingør, Denmark
   Department of Marine Biology, Leon H. Charney School of Marine Sciences, University of Haifa, Mt, Carmel, Haifa, Israel
C2 IRD, FRANCE
   UNIV AIX MARSEILLE, FRANCE
   IRD, FRANCE
   UNIV RHODE ISL, USA
   UNIV COPENHAGEN, DENMARK
   UNIV HAIFA, ISRAEL
UM LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-europe
   copubli-univ-france
   copubli-int-hors-europe
IF 11
TC 15
UR https://archimer.ifremer.fr/doc/00788/89959/102613.pdf
LA English
DT Article
CR TONGA 2019
BO L'Atalante
AB The photosynthetic cyanobacterium Trichodesmium is widely distributed in the surface low latitude ocean where it contributes significantly to N2 fixation and primary productivity. Previous studies found nifH genes and intact Trichodesmium colonies in the sunlight-deprived meso- and bathypelagic layers of the ocean (200–4000 m depth). Yet, the ability of Trichodesmium to fix N2 in the dark ocean has not been explored. We performed 15N2 incubations in sediment traps at 170, 270 and 1000 m at two locations in the South Pacific. Sinking Trichodesmium colonies fixed N2 at similar rates than previously observed in the surface ocean (36–214 fmol N cell−1 d−1). This activity accounted for 40 ± 28% of the bulk N2 fixation rates measured in the traps, indicating that other diazotrophs were also active in the mesopelagic zone. Accordingly, cDNA nifH amplicon sequencing revealed that while Trichodesmium accounted for most of the expressed nifH genes in the traps, other diazotrophs such as Chlorobium and Deltaproteobacteria were also active. Laboratory experiments simulating mesopelagic conditions confirmed that increasing hydrostatic pressure and decreasing temperature reduced but did not completely inhibit N2 fixation in Trichodesmium. Finally, using a cell metabolism model we predict that Trichodesmium uses photosynthesis-derived stored carbon to sustain N2 fixation while sinking into the mesopelagic. We conclude that sinking Trichodesmium provides ammonium, dissolved organic matter and biomass to mesopelagic prokaryotes. 
PY 2022
PD OCT
SO Isme Journal
SN 1751-7362
PU Springer Science and Business Media LLC
VL 16
IS 10
UT 000825172300001
BP 2398
EP 2405
DI 10.1038/s41396-022-01289-6
ID 89959
ER

EF