FN Archimer Export Format
PT J
TI New insights into the distributions of nitrogen fixation and diazotrophs revealed by high-resolution sensing and sampling methods
BT 
AF Tang, Weiyi
   Cerdán-García, Elena
   Berthelot, Hugo
   Polyviou, Despo
   Wang, Seaver
   Baylay, Alison
   Whitby, Hannah
   Planquette, Helene
   Mowlem, Matthew
   Robidart, Julie
   Cassar, Nicolas
AS 1:1;2:2;3:3;4:2;5:1;6:2;7:3;8:5;9:4;10:4;11:1,3;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;
C1 Division of Earth and Ocean Sciences, Nicholas School of the Environment, Duke University, Durham, NC, 27708, USA
   Department of Ocean and Earth Sciences, National Oceanography Centre, University of Southampton, European Way, SO14 3ZH, Southampton, UK
   CNRS, Univ Brest, IRD, Ifremer, LEMAR, F-29280 Plouzané, France
   Ocean Technology and Engineering Group, National Oceanography Centre, European Way, SO14 3ZH, Southampton, UK
   CNRS, Univ Brest, IRD, Ifremer, LEMAR, F-29280 Plouzané, France
C2 UNIV DUKE, USA
   UNIV SOUTHAMPTON, UK
   UBO, FRANCE
   NOC, UK
   CNRS, FRANCE
UM LEMAR
IN WOS Cotutelle UMR
   copubli-europe
   copubli-int-hors-europe
IF 10.302
TC 33
UR https://archimer.ifremer.fr/doc/00635/74705/74648.pdf
   https://archimer.ifremer.fr/doc/00635/74705/74649.docx
LA English
DT Article
AB Nitrogen availability limits marine productivity across large ocean regions. Diazotrophs can supply new nitrogen to the marine environment via nitrogen (N2) fixation, relieving nitrogen limitation. The distributions of diazotrophs and N2 fixation have been hypothesized to be generally controlled by temperature, phosphorus, and iron availability in the global ocean. However, even in the North Atlantic where most research on diazotrophs and N2 fixation has taken place, environmental controls remain contentious. Here we measure diazotroph composition, abundance, and activity at high resolution using newly developed underway sampling and sensing techniques. We capture a diazotrophic community shift from Trichodesmium to UCYN-A between the oligotrophic, warm (25–29 °C) Sargasso Sea and relatively nutrient-enriched, cold (13–24 °C) subpolar and eastern American coastal waters. Meanwhile, N2 fixation rates measured in this study are among the highest ever recorded globally and show significant increase with phosphorus availability across the transition from the Gulf Stream into subpolar and coastal waters despite colder temperatures and higher nitrate concentrations. Transcriptional patterns in both Trichodesmium and UCYN-A indicate phosphorus stress in the subtropical gyre. Over this iron-replete transect spanning the western North Atlantic, our results suggest that temperature is the major factor controlling the diazotrophic community structure while phosphorous drives N2 fixation rates. Overall, the occurrence of record-high UCYN-A abundance and peak N2 fixation rates in the cold coastal region where nitrate concentrations are highest (~200 nM) challenges current paradigms on what drives the distribution of diazotrophs and N2 fixation. 
PY 2020
PD OCT
SO Isme Journal
SN 1751-7362
PU Springer Science and Business Media LLC
VL 14
IS 10
UT 000552781700001
BP 2514
EP 2526
DI 10.1038/s41396-020-0703-6
ID 74705
ER

EF