Populations of Pacific Oysters Crassostrea gigas Respond Variably to Elevated CO2 and Predation by Morula marginalba, supplement to: Wright, John M; Parker, Laura M; O'Connor, Wayne A; Williams, Mark; Kube, Peter; Ross, Pauline M (2014): Populations of pacific oysters Crassostrea gigas respond variably to rlevated CO2 and predation by Morula marginalba. Biological Bulletin, 226, 269-281

• Main Authors: Wright, John M, Parker, Laura M, O'Connor, Wayne A, Williams, Mark, Kube, Peter, Ross, Pauline M
• Format: Dataset
• Language: English
• Published: PANGAEA - Data Publisher for Earth & Environmental Science 2014
• Subjects: Animalia; Behaviour; Benthic animals; Benthos; Coast and continental shelf; Containers and aquaria 20-1000 L or < 1 m**2; Crassostrea gigas; Growth/Morphology; Laboratory experiment; Mollusca; Other studied parameter or process; Respiration; Single species; South Pacific; Species interaction; Temperate; Species; Incubation duration; Partial pressure of carbon dioxide water at sea surface temperature wet air; Identification; Height; Compression strength; Metabolic rate of oxygen; Height, standard error; Compression strength, standard error; Metabolic rate of oxygen, standard error; Individuals; Individuals, standard error; Salinity; Salinity, standard error; Temperature, water; Temperature, water, standard error; pH; pH, standard error; Alkalinity, total; Alkalinity, total, standard error; Carbonate system computation flag; Carbon dioxide; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Carbon, inorganic, dissolved; Aragonite saturation state; Calcite saturation state; Potentiometric; Potentiometric titration; Calculated using seacarb after Nisumaa et al. 2010; Ocean Acidification International Coordination Centre OA-ICC; O'Connor; Pacific; Ocean acidification; Pacific oyster
• Online Access: https://dx.doi.org/10.1594/pangaea.840478; https://doi.pangaea.de/10.1594/PANGAEA.840478

Ocean acidification is anticipated to decrease calcification and increase dissolution of shelled molluscs. Molluscs with thinner and weaker shells may be more susceptible to predation, but not all studies have measured negative responses of molluscs to elevated pCO2. Recent studies measuring the response of molluscs have found greater variability at the population level than first expected. Here we investigate the impact of acidification on the predatory whelk Morula marginalba and genetically distinct subpopulations of the Pacific oyster Crassostrea gigas. Whelks and eight family lines of C. gigas were separately exposed to ambient (385 ppm) and elevated (1000 ppm) pCO2 for 6 weeks. Following this period, individuals of M. marginalba were transferred into tanks with oysters at ambient and elevated pCO2 for 17 days. The increase in shell height of the oysters was on average 63% less at elevated compared to ambient pCO2. There were differences in shell compression strength, thickness, and mass among family lines of C. gigas, with sometimes an interaction between pCO2 and family line. Against expectations, this study found increased shell strength in the prey and reduced shell strength in the predator at elevated compared to ambient pCO2. After 10 days, the whelks consumed significantly more oysters regardless of whether C. gigas had been exposed to ambient or elevated CO2, but this was not dependent on the family line and the effect was not significant after 17 days. Our study found an increase in predation after exposure of the predator to predicted near-future levels of estuarine pCO2. : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne et al, 2014) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). The date of carbonate chemistry calculation is 2014-12-04.