Life-history traits in the Pacific oyster Crassostrea gigas are robust to ocean acidification under two thermal regimes
|Author(s)||Di poi Carole1, Brodu Nicolas1, Gazeau Frédéric2, Pernet Fabrice1|
|Affiliation(s)||1 : Ifremer, UBO, CNRS, IRD, Laboratoire des sciences de l'environnement marin, LEMAR , 29840 Argenton-en-Landunvez , France
2 : Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, LOV , 06230 Villefranche-sur-Mer , France
|Source||Ices Journal Of Marine Science (1054-3139) (Oxford University Press (OUP)), 2022-12 , Vol. 79 , N. 10 , P. 2614-2629|
|WOS© Times Cited||1|
|Keyword(s)||combined effects, Crassostrea gigas, intergenerational carryover, life stage, ocean acidification, ocean warming, oyster|
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.