OA sensitivity differs between populations of the Sydney Rock oyster

• Main Authors: Stapp, Laura, Parker, Laura M, O'Connor, Wayne A, Bock, Christian, Ross, Pauline M, Pörtner, Hans-Otto, Lannig, Gisela
• Format: Dataset
• Language: English
• Published: PANGAEA 2017
• Subjects: Acid-base regulation; Animalia; Benthic animals; Benthos; Coast and continental shelf; Containers and aquaria (20-1000 L or < 1 m**2); Growth/Morphology; Laboratory experiment; Mollusca; OA-ICC; Ocean Acidification International Coordination Centre; Other metabolic rates; Respiration; Saccostrea glomerata; Single species; South Pacific; Temperate; Pacific; Ocean acidification
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.884093; https://doi.org/10.1594/PANGAEA.884093

Understanding mechanisms of intraspecific variation in resilience to environmental drivers is key to predict species' adaptive potential. Recent studies show a higher CO2 resilience of Sydney rock oysters selectively bred for increased growth and disease resistance ('selected oysters') compared to the wild population. We tested whether the higher resilience of selected oysters correlates with an increased ability to compensate for CO2-induced acid-base disturbances. After 7 weeks of exposure to elevated seawater PCO2 (1100 µatm), wild oysters had a lower extracellular pH (pHe = 7.54 ± 0.02 (control) vs. 7.40 ± 0.03 (elevated PCO2)) and increased hemolymph PCO2 whereas extracellular acid-base status of selected oysters remained unaffected. However, differing pHe values between oyster types were not linked to altered metabolic costs of major ion regulators (Na+/K+-ATPase, H+-ATPase and Na+/H+-exchanger) in gill and mantle tissues. Our findings suggest that selected oysters possess an increased systemic capacity to eliminate metabolic CO2, possibly through higher and energetically more efficient filtration rates and associated gas exchange. Thus, effective filtration and CO2 resilience might be positively correlated traits in oysters.