FN Archimer Export Format
PT J
TI Differential reaction norms to ocean acidification in two oyster species from contrasting habitats
BT 
AF Caillon, Coline
   Pernet, Fabrice
   Lutier, Mathieu
   Di Poi, Carole
AS 1:1;2:1;3:1,2;4:1;
FF 1:PDG-RBE-PHYTNESS;2:PDG-RBE-PHYTNESS;3:PDG-RBE-PFOM-LPI;4:PDG-RBE-PHYTNESS;
C1 Ifremer, Univ Brest, CNRS, IRD, UMR 6539 LEMAR 1 , 29280 Plouzané , France
   Section for Aquatic Biology and Toxicology, Department of Biosciences, University of Oslo, Blindernveien 31, 0371 Oslo , Norway
C2 IFREMER, FRANCE
   UNIV OSLO, NORWAY
SI BREST
   ARGENTON
SE PDG-RBE-PHYTNESS
   PDG-RBE-PFOM-LPI
UM LEMAR
IN WOS Ifremer UMR
   copubli-europe
IF 2.8
TC 0
UR https://archimer.ifremer.fr/doc/00867/97916/107014.pdf
LA English
DT Article
DE ;Bleaching;Fatty acid;Mollusc;pH;Plasticity;Tipping point
AB Ocean acidification (OA), a consequence of the increase in anthropogenic emissions of carbon dioxide, causes major changes in the chemistry of carbonates in the ocean with deleterious effects on calcifying organisms. The pH/PCO2 range to which species are exposed in nature is important to consider when interpreting the response of coastal organisms to OA. In this context, emerging approaches, which assess the reaction norms of organisms to a wide pH gradient, are improving our understanding of tolerance thresholds and acclimation potential to OA. In this study, we deciphered the reaction norms of two oyster species living in contrasting habitats: the intertidal oyster Crassostrea gigas and the subtidal flat oyster Ostrea edulis, which are two economically and ecologically valuable species in temperate ecosystems. Six-month-old oysters of each species were exposed in common garden tanks for 48 days to a pH gradient ranging from 7.7 to 6.4 (total scale). Both species were tolerant down to a pH of 6.6 with high plasticity in fitness-related traits such as survival and growth. However, oysters underwent remodelling of membrane fatty acids to cope with decreasing pH along with shell bleaching impairing shell integrity and consequently animal fitness. Finally, our work revealed species-specific physiological responses and highlights that intertidal C. gigas seem to have a better acclimation potential to rapid and extreme OA changes than O. edulis. Overall, our study provides important data about the phenotypic plasticity and its limits in two oyster species, which is essential for assessing the challenges posed to marine organisms by OA. 
PY 2023
PD DEC
SO Journal Of Experimental Biology
SN 0022-0949
PU The Company of Biologists
VL 226
IS 23
UT 001131769800016
DI 10.1242/jeb.246432
ID 97916
ER

EF