FN Archimer Export Format
PT J
TI Diagenetic Processes in Aquaculture Ponds Showing Metal Accumulation on Shrimp Gills
BT 
AF Lemonnier, Hugues
   Royer, Florence
   Caradec, Florian
   LOPEZ, Etienne
   HUBERT, Clarisse
   Rabiller, Emilie
   DESCLAUX, Terence
   Fernandez, Jean-Michel
   ANDRIEUX-LOYER, Francoise
AS 1:1;2:1;3:2;4:1;5:1,3;6:2;7:1;8:4;9:2;
FF 1:PDG-RBE-LEADNC;2:PDG-RBE-LEADNC;3:PDG-ODE-DYNECO-PELAGOS;4:;5:PDG-RBE-LEADNC;6:PDG-ODE-DYNECO-PELAGOS;7:PDG-RBE-LEADNC;8:;9:PDG-ODE-DYNECO-PELAGOS;
C1 Ifremer, IRD, Univ Nouvelle-Calédonie, Univ La Réunion, UMR 92200 ENTROPIE, Nouméa, France
   Ifremer , DYNECO PELAGOS, ZI Pointe du Diable, Plouzané, France
   Ifremer , Station de Sète, Sète Cedex, France
   AEL , Pépinière d’Entreprises IRD Promenade Laroque, Nouméa, France
C2 IFREMER, FRANCE
   IFREMER, FRANCE
   IFREMER, FRANCE
   AEL, FRANCE
SI NOUMEA
   SAINT VINCENT
   BREST
SE PDG-RBE-LEADNC
   PDG-ODE-DYNECO-PELAGOS
UM ENTROPIE
IN WOS Ifremer UPR
   WOS Ifremer UMR
   DOAJ
   copubli-france
IF 5.247
TC 5
UR https://archimer.ifremer.fr/doc/00678/79026/81450.pdf
   https://archimer.ifremer.fr/doc/00678/79026/81451.pdf
LA English
DT Article
DE ;Shrimp aquaculture sustainability;iron deposits;gills;sediment acidification;redox dynamic;dynamic of metals;pyrite
AB The gill is the organ by which many toxic metals are taken up by crustaceans. Iron is known to precipitate at its surface, a phenomenon recently observed in some tropical aquaculture ponds. The present study uses a field approach to understand better the environmental conditions and ecological processes involved in this deposit. Because shrimp are exposed to reduced products originating from organic waste accumulated in the sediment, spatial variation in pH, redox potential and concentrations of dissolved metals in pore water were investigated in these ponds. Total organic carbon, acid volatile sulfide and pyrite were also analyzed in the solid phase. Fe2+ in pore waters showed high spatial variability between ponds and within the same pond with concentrations up to 1,193 μmol l–1. Behaviors of Fe2+, Mn2+ and Co2+ in pore water were similar. Four geochemical environments were identified, based on their physico-chemical characteristics. Highest concentrations for Fe2+, Mn2+ and Co2+ in sediment pore water occurred in slightly acidic and suboxic conditions. When the sediment became anoxic, the H2S produced reacted with Fe2+ and/or Co2+ to form acid volatile sulfide and pyrite. When pH increased, the concentration of free H2S rose up to 736 μmol l–1. With neutral and suboxic conditions, dissolved metal concentrations could be controlled by their precipitation as oxides and hydroxides. The production of pyrite suggested the existence of a possible process of sediment acidification between two crop periods through the production of sulfuric acid. This acidification could increase with pond age and be the cause of the accumulation of reduced metal after 30 years of aquaculture activity. 
PY 2021
PD FEB
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media SA
VL 8
UT 000618367700001
DI 10.3389/fmars.2021.625789
ID 79026
ER

EF