Life-history traits in the Pacific oyster Crassostrea gigas are robust to ocean acidification under two thermal regimes

Carole Di Poi (1, 2) , Nicolas Brodu (1) , Frédéric Gazeau (3) , Fabrice Pernet (1)

1 LEMAR - Laboratoire des Sciences de l'Environnement Marin (LEMAR)
2 IFREMER - Institut Français de Recherche pour l'Exploitation de la Mer
3 LOV - Laboratoire d'océanographie de Villefranche

Abstract Ocean acidification and warming (OAW) are pressing contemporary issues affecting marine life and specifically calcifying organisms. Here, we investigated the direct effects of OAW on life-history traits of the Pacific oyster Crassostrea gigas, the most cultivated bivalve species worldwide. We also tested whether parental conditioning history shaped the phenotypic characters of their progenies (intergenerational carryover effects). Adult oysters and their offspring were exposed to two temperatures (18°C, +3°C) under ambient pH conditions or under an end-of-century acidification scenario (−0.33 pH unit). In adults, we monitored standard biometric and reproductive parameters, stress response by quantifying neuroendocrine metabolites and gamete quality. In larvae, we measured hatching rate, size, biochemical quality, and behavior. We found that reducing pH reduced growth rate and activated the serotonin system, but increasing temperature attenuated these effects. There was no effect of pH on reproduction at either temperature, and no intergenerational carryover effects. Larval characteristics were similar between treatments, regardless of parental conditioning history. Thus, the Pacific oyster seems robust to changes in pH, and increasing temperature is not an aggravating factor. We emphasize that the use of neuroendocrine indicators holds promise for revealing sublethal impacts of environmental changes.

Domaines: Milieux et Changements globaux

Carole Di Poi, Nicolas Brodu, Frédéric Gazeau, Fabrice Pernet. Life-history traits in the Pacific oyster Crassostrea gigas are robust to ocean acidification under two thermal regimes. ICES Journal of Marine Science, 2022, 79 (10), pp.2614-2629. ⟨10.1093/icesjms/fsac195⟩. ⟨hal-03842372⟩