Combined effects of temperature and copper and S-metolachlor on embryo-larval development of the Pacific oyster, Crassostrea gigas

• Published in: Marine Pollution Bulletin
• Main Authors: GAMAIN, Perrine, GONZALEZ, Patrice, CACHOT, Jérôme, CLERANDEAU, Christelle, MAZZELLA, Nicolas, GOURVES, Pierre Yves, MORIN, Benedicte
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2017
• Subjects: Pacific oyster; Copper; Herbicide; Embryotoxicity; Climate change; Sciences de l'environnement; Crassostrea gigas
• Online Access: https://oskar-bordeaux.fr/handle/20.500.12278/199007; https://hdl.handle.net/20.500.12278/199007; https://doi.org/10.1016/j.marpolbul.2016.12.018

This study evaluates the combined effects of two contaminants (copper and a herbicide S-metolachlor) and temperature on the early life stages of the Pacific oyster Crasssotrea gigas,which is native to Arcachon Bay (southwest France). The responses of D-larvae, obtained fromwild and cultivated oysters,were investigated for one year during the oyster breeding period at different sampling sites and compared with the response of D-larvae from a commercial hatchery. Embryotoxicity was measured by considering the percentage of abnormal D-shaped larvae. Normal development of embryos occurred only from 22 °C to 26 °C. There were synergistic effects of copper at low and high temperatures. Native oysters appear particularly sensitive to an increase in water temperature, suggesting a future increase in the percentage of larval abnormalities as a result of global climate change. Hatchery oysters represent a good alternative model for studying the effects of both pollutants and climate change stressors.