Seawater carbonate chemistry values for the four treatments.

Values represent the mean ±SD of bimonthly measures taken over the six months exposure period (n = 12 for each treatment). Mussels were either exposed to: ambient pH and ambient temperature (ambient); ambient pH and elevated temperature (warming); reduced pH and ambient temperature (acidified); or reduced pH and elevated temperature (warming+acidified). TRT represents treatment, T = temperature, Sal = Salinity, pHT = pH (total scale), TA = total alkalinity, DIC = dissolved inorganic carbon, pCO2 = CO2 partial pressure, HCO3− = bicarbonate, CO32− = carbonate, Ωarag = aragonite saturation state, and Ωcalc = calcite saturation state. Measured values are: temperature, salinity, TA, and DIC. Calculated values are pH, pCO2, HCO3, CO32−, Ωarag and Ωcalc.