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The decline in ocean water pH and changes in carbonate saturation states through anthropogenically mediated increases in atmospheric CO 2  levels may pose a hazard to marine organisms. This may be particularly acute for those species reliant on calcareous structures like shells and exoskeletons. This is of particular concern in the case of valuable commercially exploited species such as the king scallop,  Pecten maximus . In this study we investigated the effects on oxygen consumption, clearance rates and cellular turnover in juvenileP.  maximusfollowing 3 months laboratory exposure to four  p CO 2  treatments (290, 380, 750 and 1140 µatm). None of the exposure levels were found to have significant effect on the clearance rates, respiration rates, condition index or cellular turnover (RNA: DNA) of individuals. While it is clear that some life stages of marine bivalves appear susceptible to future levels of ocean acidification, particularly under food limiting conditions, the results from this study suggest that where food is in abundance, bivalves like juvenileP.  maximusmay display a tolerance to limited changes in seawater chemistry.

Juvenile King Scallop, Pecten maximus, Is Potentially Tolerant to Low Levels of Ocean Acidification When Food Is Unrestricted