FN Archimer Export Format
PT J
TI Oxygen isotope disequilibrium in the juvenile portion of oyster shells biases seawater temperature reconstructions
BT 
AF Huyghe, Dimitri
   Emmanuel, Laurent
   de Rafelis, Marc
   Renard, Maurice
   Ropert, Michel
   Labourdette, Nathalie
   Lartaud, Franck
AS 1:1,2;2:3;3:2;4:3;5:4;6:3;7:1;
FF 1:;2:;3:;4:;5:PDG-ODE-LITTORAL-LERN;6:;7:;
C1 Sorbonne Université, CNRS, Laboratoire d'Ecogéochimie des Environnements Benthiques, LECOB, F-66650, Banyuls-sur-mer, France
   Géosciences Environnement Toulouse, CNRS, IRD, Université Paul Sabatier Toulouse 3, 14 Avenue Edouard Belin, 31400, Toulouse, France
   Sorbonne Université, CNRS-INSU, Institut des Sciences de la Terre Paris, ISTeP, F-75005 Paris, France
   Ifremer, Laboratoire Environnement Ressource de Normandie, Avenue du Général de Gaulle, BP 32, 14520, Port-en-Bessin, France
C2 UNIV SORBONNE, FRANCE
   UNIV TOULOUSE, FRANCE
   UNIV SORBONNE, FRANCE
   IFREMER, FRANCE
SI PORT-EN-BESSIN
SE PDG-ODE-LITTORAL-LERN
IN WOS Ifremer UPR
   copubli-france
   copubli-univ-france
IF 2.929
TC 10
UR https://archimer.ifremer.fr/doc/00624/73622/73038.pdf
LA English
DT Article
DE ;Stable isotopes;Paleoclimatology;Sclerogeochemistry;Sclerochronology;Kinetic isotope effect
AB For decades, bivalve shells have constituted one of the most common supports for paleoclimatic archives based on stable isotope approaches. In this work, we conducted chemical marking and recapture techniques to study the fluctuation of δ18O values of oyster shells of the species Magallana gigas reared in natural environment in Normandy (France) for two years. The results were compared to the continuous monitoring of temperature and salinity and monthly records of seawater δ18O. Isotopic measurements were performed on the hinge area that regroups the whole life of the oysters. Here we demonstrate that oysters mineralized their shells with no significant growth breaks during the two-years experiment, even at temperatures below 6 °C. The results confirm that adult oysters (i.e. > 1 yr) mineralized their shells at equilibrium. However, juvenile specimens exhibit a strong isotopic disequilibrium, with a maximum shift of the δ18O values of 3‰ in winter, likely due to kinetic isotope effects. This corresponds to a reconstructed temperature up to 13 °C warmer than expected. This work indicates that although these oyster shells can be used as an accurate archive of (paleo)environmental conditions, the shell portion mineralized during the juvenile stage (i.e. < 1 yr) should be avoided for paleotemperature reconstructions. Given the wide use of bivalve shells as environmental archives, similar studies on others species are required. 
PY 2020
PD AUG
SO Estuarine Coastal And Shelf Science
SN 0272-7714
PU Elsevier BV
VL 240
UT 000535863600014
DI 10.1016/j.ecss.2020.106777
ID 73622
ER

EF