Effects of CO2 concentrations on growth in the coccolithophorids (haptophyta)

Abstract Transformation CO 2 into cell organic matter and cell CaCO 3 (coccoliths) by coccolithophorids is one of the useful ways to remove CO 2 indirectly in fluegas generated at thermal power plants in addition to the reduction of atmospheric CO 2 . To examine the effects of 100% CO 2 on the growth, determined as cell organic carbon and cell inorganic carbon (coccoliths), in the two coccolithophorids species, Pleurochrysis carterae and Pleurochrysis haptonemofera , the cultures with race way method were carried out by maintaining pH with intermittent supply of 100% CO 2 . Furthermore, the results of the growth under 100% CO 2 were compared with that of the growth under atmospheric CO 2 concentration (0.04% CO 2 ). As a result, the growth rates of both species were increased remarkably by supply of 100% CO 2 , and the growth rates and the maximum yields with 100% CO 2 of P. haptonemofera were 1.5 times and 2 times higher than those of P. carterae , respectively.