OA sensitivity differs between populations of the Sydney Rock oyster

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'...

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Bibliographic Details
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
Description
Summary: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.

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