The study was conducted at three locations: Barru, Takalar and Barrang Lompo Island using mesocosm technique with two different of incubation periods (48 and 96 hours). Six pCO2 level based on adding acid base treatments were used, which were 280, 380, 550, 650, 750 and 1000 ppm with 4 replicates
In general, alkalinity decreased with increasing CO2 concentration. However, length of incubation was showed no significant affected to DIC for all CO2 concentration at Barru and Barrang Lompo mesocosm experiment. PIC and POC showed a varied response between all locations of mesocosms experiment. There was a trend where increasing of POC with increasing of CO2 concentration. PIC concentration at Barru and Takalar showed a slightl higher at 96 hours than 48 hours of incubation period and for Barrang Lompo mesocosm experiment PIC was higher at 48 hours than 96 hours of incubation period. Chlorophyll a and cell abundance was decresing with increasing CO2 concentration. Growth, photosynthesis and calcification rate decreased with increasing CO2 concentration.