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Ocean acidification is predicted to have severe consequences for calcifying marine organisms especially molluscs. Recent studies, however, have found that molluscs in marine environments with naturally elevated or fluctuating CO 2  or with an active, high metabolic rate lifestyle may have a capacity to acclimate and be resilient to exposures of elevated environmental  p CO 2 . The aim of this study was to determine the effects of near future concentrations of elevated  p CO 2  on the larval and adult stages of the mobile doughboy scallop,  Mimachlamys asperrima  from a subtidal and stable physio-chemical environment. It was found that fertilisation and the shell length of early larval stages of  M. asperrima  decreased as  p CO 2  increased, however, there were less pronounced effects of elevated  p CO 2  on the shell length of later larval stages, with high  p CO 2  enhancing growth in some instances. Byssal attachment and condition index of adult  M. asperrima  decreased with elevated  p CO 2 , while in contrast there was no effect on standard metabolic rate or pH  e .  The responses of larval and adult  M. asperrima  to elevated  p CO 2  measured in this study were more moderate than responses previously reported for intertidal oysters and mussels. Even this more moderate set of responses are still likely to reduce the abundance of  M. asperrima  and potentially other scallop species in the world’s oceans at predicted future  p CO 2  levels.

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Mixed Effects of Elevated pCO2 on Fertilisation, Larval and Juvenile Development and Adult Responses in the Mobile Subtidal Scallop Mimachlamys asperrima (Lamarck, 1819)