FN Archimer Export Format
PT J
TI Effects of elevated temperature and pCO2 on the respiration, biomineralization and photophysiology of the giant clam Tridacna maxima
BT 
AF Brahmi, Chloé
   Chapron, Leila
   Le Moullac, Gilles
   Soyez, Claude
   Beliaeff, Benoit
   Lazareth, Claire E
   Gaertner-Mazouni, Nabila
   Vidal-Dupiol, Jeremie
AS 1:1;2:2;3:3;4:3;5:3;6:4;7:1;8:3,5;
FF 1:;2:;3:PDG-RBE-RMPF;4:PDG-RBE-RMPF;5:PDG-RBE;6:;7:;8:PDG-RBE-IHPE;
C1 Univ. Polynésie française, IFREMER, ILM, IRD, EIO UMR 241, F-98702 Faa’a, Tahiti, Polynésie française
   School of Earth Sciences, The Ohio State University, Columbus, OH 43210, USA
   IFREMER, IRD, Institut Louis-Malardé, Univ. Polynésie française, EIO, F-98719 Taravao, Tahiti, Polynésie française, France
   Laboratoire de Biologie des Organismes et Ecosystèmes Aquatiques (BOREA) MNHN, CNRS, IRD, SU, UCN, UA, Muséum National d'Histoire Naturelle, 61 Rue Buffon, CP53, 75231, Paris Cedex 05, France
   IHPE, Univ. Montpellier, CNRS, Ifremer, Univ. Perpignan Via Domitia, Montpellier ,France
C2 UNIV POLYNESIE FRANCAISE, FRANCE
   UNIV OHIO STATE, USA
   IFREMER, FRANCE
   MNHN, FRANCE
   IFREMER, FRANCE
SI TAHITI
   BREST
   MONTPELLIER
SE PDG-RBE-RMPF
   PDG-RBE
   PDG-RBE-IHPE
UM IHPE
   EIO
IN WOS Ifremer UMR
   WOS Cotutelle UMR
   DOAJ
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
IF 3.252
TC 5
UR https://archimer.ifremer.fr/doc/00700/81234/85544.pdf
   https://archimer.ifremer.fr/doc/00700/81234/85545.zip
LA English
DT Article
DE ;Giant clams;ocean acidification;photosynthetic yield;respiration;symbionts;thermal stress
AB Many reef organisms, such as the giant clams, are confronted with global change effects. Abnormally high seawater temperatures can lead to mass bleaching events and subsequent mortality, while ocean acidification may impact biomineralization processes. Despite its strong ecological and socio-economic importance, its responses to these threats still need to be explored. We investigated physiological responses of 4-year-old Tridacna maxima to realistic levels of temperature (+1.5°C) and partial pressure of carbon dioxide (pCO2) (+800 μatm of CO2) predicted for 2100 in French Polynesian lagoons during the warmer season. During a 65-day crossed-factorial experiment, individuals were exposed to two temperatures (29.2°C, 30.7°C) and two pCO2 (430 μatm, 1212 μatm) conditions. The impact of each environmental parameter and their potential synergetic effect were evaluated based on respiration, biomineralization and photophysiology. Kinetics of thermal and/or acidification stress were evaluated by performing measurements at different times of exposure (29, 41, 53, 65 days). At 30.7°C, the holobiont O2 production, symbiont photosynthetic yield and density were negatively impacted. High pCO2 had a significant negative effect on shell growth rate, symbiont photosynthetic yield and density. No significant differences of the shell microstructure were observed between control and experimental conditions in the first 29 days; however, modifications (i.e. less-cohesive lamellae) appeared from 41 days in all temperature and pCO2 conditions. No significant synergetic effect was found. Present thermal conditions (29.2°C) appeared to be sufficiently stressful to induce a host acclimatization response. All these observations indicate that temperature and pCO2 are both forcing variables affecting T. maxima’s physiology and jeopardize its survival under environmental conditions predicted for the end of this century. 
PY 2021
PD JUL
SO Conservation Physiology
SN 2051-1434
PU Oxford University Press (OUP)
VL 9
IS 1
UT 000722518400001
DI 10.1093/conphys/coab041
ID 81234
ER

EF