Evidence that ocean acidification affects the coral-algal symbiosis has been seen in several physiological studies. Dufault (2013) and Suggett et al. (2013) observed that the effects of ocean acidification on calcification (a coral process) are mediated by the amount of light available for photosynthesis (an algal process). Langdon and Atkinson (2005) observed that ocean acidification increased net carbon production (via photosynthesis) and reduced calcification, suggesting that ocean acidification exacerbates competition between the two processes for dissolved inorganic carbon. Reynaud et al.(2003) observed an increased number of algal cells per animal cell in Stylophora pistillata exposed to 798 µatm pCO2. From these studies, is clear that a wide scope exists for ocean acidification to impact on the coral-algal symbiosis, through several potential mechanisms.