Mixed effects of elevated pCO2 on fertilisation, larval and juvenile development and adult responses in the mobile subtidal scallop Mimachlamys asperrima (Lamarck, 1819)

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 CO2 or with an active, high metabolic rate lifestyle may have a capacity to acclimate and be resilient to exposures of elevated environmental pCO2. The aim of this study was to determine the effects of near future concentrations of elevated pCO2 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 pCO2 increased, however, there were less pronounced effects of elevated pCO2 on the shell length of later larval stages, with high pCO2 enhancing growth in some instances. Byssal attachment and condition index of adult M. asperrima decreased with elevated pCO2, while in contrast there was no effect on standard metabolic rate or pHe. The responses of larval and adult M. asperrima to elevated pCO2 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 pCO2 levels.

Parentación y afectuoso sentimiento que la M.N. y M.L. ciudad de Pamplona, cabeza del fidelísimo Reino de Navarra consagró a la memoria de la Señora Doña Isabel Francisca de Braganza y Borbón, Reina de las Españas, en las magestuosas exequias que con fúnebre pompa celebró en su Iglesia Catedral en los días 19 y 20 del mes de Enero del año 1819 / escritas por Xavier María de Arvizu y Echeverría.

Digitalización Vitoria-Gasteiz Archivos y Bibliotecas Julio 1995 18-6

Ordenanzas concedidas al gremio de pelaires de la Ciudad de Valencia en virtud de Real Cedula de Su Mag... y Señores de su Real Junta de Comercio, y de Moneda, expedida en 15 de Febrero de 1734... : con la explicación de diferentes capitulos...

Texto fechado en Valencia a 17 de abril de 1734