FN Archimer Export Format
PT J
TI Are benthic nutrient fluxes from intertidal mudflats driven by surface sediment characteristics?
BT 
AF Louis, Justine
   Jeanneau, Laurent
   ANDRIEUX-LOYER, Francoise
   Gruau, Gérard
   Caradec, Florian
   Lebris, Nathalie
   Chorin, Marion
   Jardé, Emilie
   Rabiller, Emilie
   Petton, Christophe
   Bouger, Guillaume
   Petitjean, Patrice
   Laverman, Anniet M.
AS 1:1;2:2;3:3;4:2;5:3;6:1;7:1;8:2;9:3;10:2;11:1;12:2;13:1;
FF 1:;2:;3:PDG-ODE-DYNECO-PELAGOS;4:;5:PDG-ODE-DYNECO-PELAGOS;6:;7:;8:;9:PDG-ODE-DYNECO-PELAGOS;10:;11:;12:;13:;
C1 Centre National de la Recherche Scientifique (CNRS), ECOBIO – UMR 6553, Université de Rennes 1, 35042 Rennes, France
   Centre National de la Recherche Scientifique (CNRS), Géosciences Rennes – UMR 6118, Université de Rennes 1, 35042 Rennes, France
   Ifremer, DYNECO PELAGOS, ZI Pointe du Diable, 29280 Plouzané, France
C2 CNRS, FRANCE
   CNRS, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-ODE-DYNECO-PELAGOS
IN WOS Ifremer UPR
   copubli-france
IF 1.424
TC 2
UR https://archimer.ifremer.fr/doc/00702/81370/85738.pdf
   https://archimer.ifremer.fr/doc/00702/81370/85739.pdf
LA English
DT Article
DE ;Benthic nutrient fluxes;Coastal sediment;Organic matter;Spatial variability;Diffusive transport;Microbial and chemical processes
AB A broad sampling program was carried out in the spring of 2019 on the Brittany coast to assess how the surface sediment characteristics drive the benthic effluxes of ammonium (NHÅ 4 ) and phosphate (PO4) from intertidal mudflats. A total of 200 sediment samples were characterized by their porosity, grain-size, elemental composition and pigment contents, as well as the benthic fluxes of NHÅ 4 and PO4 determined by core incubations. The results showed that (1) a high phaeopigment and iron-bound phosphorus content (Fe-P) and a low porosity were significantly related to the high PO4 flux, and (2) a high porosity and the TN:Org-P ratio in the sediment organic matter (SOM) were related to the high NHÅ 4 flux. This indicated that PO4 fluxes would be more driven by the redox status of the sediment through the desorption of Fe-P under specific anoxic conditions during the algal decomposition. NHÅ 4 fluxes would be more driven by high NHÅ 4 recycling rates from SOM mineralization and high sediment–water exchanges, enhancing the diffusion of NHÅ 4 to the overlying water. The present study allowed to highlight the large variability in the benthic nutrient fluxes at the regional scale, as a result of the connections between microbial (SOM mineralization), chemical (adsorption–desorption) and physical (diffusion) processes. 
PY 2021
SO Comptes Rendus Geoscience
SN 1631-0713
PU Académie des Sciences
VL 353
IS 1
UT 000743579100003
BP 173
EP 191
DI 10.5802/crgeos.57
ID 81370
ER

EF