, Volume 117, Issue 1, pp 129-132

Calcification in the articulated coralline alga Corallina pilulifera, with special reference to the effect of elevated CO2 concentration

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Abstract

Calcification in Corallina pilulifera Postels et Ruprecht displayed diurnal variations in aerated (350 ppm CO2) culture media, with faster rates during the light than during the dark period. Addition of CO2 (air+1250 ppm) inhibited calcification. This was attributable to the decreased pH resulting from CO2 addition. Both photosynthesis and calcification were enhanced in seawater, with elevated dissolved inorganic carbon concentrations at a constant pH of 8.2.

Communicated by M. G. Hadfield, Honolulu