INTERACTION OF CO2 AND LIGHT AVAILABILITY ON PHOTOPHYSIOLOGY OF TROPICAL COCCOLITOPHORIDS (EMILIANIA HUXLEYI, GEPHYROCAPSA OCEANICA, AND OCHOSPHAERA SP.)

The study to examine the calcification rate, adaptation, and biotic response of three tropical coccolithophorids (Emiliania huxleyi, Gephyrocapsa oceanica, Ochosphaera sp) changes in CO2 concentration. Three selected calcifying coccolitophorids were grown at batch culture with system two levels (385 1000 ppm) light dark periods. parameters measured calculation including growth particulate organic carbon content, inorganic chlorophyll a, cell size, photosynthetic, organic, production, photosynthesis, rate. results showed that there was a different carbonate chemistry periods any analyzed parameters. rate microalgae tested decreasing significantly high concentrations (1000 treatment on 14:10 hour light: However, no significant difference between where they illuminated by 24 hours increasing concentration light-dark species-specific responses photosynthesis for microalgae.