FN Archimer Export Format
PT J
TI Predominant heterotrophic diazotrophic bacteria are involved in Sargassum proliferation in the great Atlantic Sargassum Belt
BT 
AF Léger-Pigout, M
   Navarro, E
   Menard, F
   Ruitton, S
   LE LOCH, Francois
   Guasco, S
   MUNARON, Jean-Marie
   Thibault, D
   Changeux, T
   Connan, S
   Stiger-Pouvreau, V
   Thibaut, T
   Michotey, V
AS 1:1;2:1;3:1;4:1;5:2;6:1;7:2;8:1;9:1;10:2;11:3;12:1;13:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;
C1 Aix Marseille Univ, Université de Toulon , CNRS, IRD, MIO, 13288 Marseille, France
   Univ Brest, CNRS, IRD, Ifremer, LEMAR , F-29280, Plouzane, France
   Univ Brest, CNRS, IRD, Ifremer, LEMAR , F-29280, Plouzane, France
C2 UNIV AIX MARSEILLE, FRANCE
   IRD, FRANCE
   UBO, FRANCE
UM LEMAR
IN WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
IF 11
TC 0
UR https://archimer.ifremer.fr/doc/00872/98342/107695.pdf
   https://archimer.ifremer.fr/doc/00872/98342/108276.pdf
   https://archimer.ifremer.fr/doc/00872/98342/108277.pdf
   https://archimer.ifremer.fr/doc/00872/98342/108278.xlsx
   https://archimer.ifremer.fr/doc/00872/98342/108279.xlsx
   https://archimer.ifremer.fr/doc/00872/98342/108280.xlsx
LA English
DT Article
CR SARGASSES CARAIBES
   SARGASSES TRANSATLANTIQUE
BO Antea
DE ;Sargassum;N2 fixation;nitrification;denitrification;GASB;isotopy;Vibrio spp
AB Since 2011, the Caribbean coasts have been subject to episodic influxes of floating Sargassum seaweed of unprecedented magnitude originating from a new area “the Great Atlantic Sargassum Belt” (GASB), leading in episodic influxes and mass strandings of floating Sargassum. For the biofilm of both holopelagic and benthic Sargassum as well as in the surrounding waters, we characterized the main functional groups involved in the microbial nitrogen cycle. The abundance of genes representing nitrogen fixation (nifH), nitrification (amoA) and denitrification (nosZ) showed the predominance of diazotrophs, particularly within the GASB and the Sargasso Sea. In both location, the biofilm associated with holopelagic Sargassum harboured a more abundant proportion of diazotrophs than the surrounding water. The mean δ15N value of the GASB seaweed was very negative (−2.04‰), and lower than previously reported, reinforcing the hypothesis that the source of nitrogen comes from the nitrogen-fixing activity of diazotrophs within this new area of proliferation. Analysis of the diversity of diazotrophic communities revealed for the first time the predominance of heterotrophic diazotrophic bacteria belonging to the phylum Proteobacteria in holopelagic Sargassum biofilms. The nifH sequences belonging to Vibrio genus (Gammaproteobacteria) and Filomicrobium sp. (Alphaproteobacteria) were the most abundant and reached respectively up to 46.0% and 33.2% of the community. We highlighted the atmospheric origin of the nitrogen used during the growth of holopelagic Sargassum within the GASB and a contribution of heterotrophic nitrogen-fixing bacteria to a part of the Sargassum proliferation. 
PY 2024
PD JAN
SO Isme Journal
SN 1751-7362
PU Oxford University Press (OUP)
VL 18
IS 1
UT 001154533300001
DI 10.1093/ismejo/wrad026
ID 98342
ER

EF