Abstract
Respiration and calcium carbonate (CaCO3) production by the farmed short-neck clam Ruditapes philippinarum were calculated to assess their importance as carbon dioxide (CO2) sink/source in a lagoon of the Po Delta River (Italy). Biomass and calcimass were established by monthly harvests during a 1-year period (2009). The ratio of CO2 released to CaCO3 precipitated was calculated as a function of the near-bottom temperature. From our estimates, R. philippinarum sequestered 8.18molCO2m-2year-1 for shell formation, but the CO2 fluxes due to respiration and calcification resulted 22.7 and 5.56 molCO2m-2year-1, respectively. Clam farming seems therefore to be a significant additional source of CO2 to seawater.
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