<div>However, evidence that ocean acidification exacerbates thermally induced coral bleaching has been mixed. Anthony et al. (2008) observed more visual paling of the corals Porites lobata and Acropora intermedia exposed to ocean acidification and ocean warming after 8 weeks than in corals exposed to ocean warming alone. Meanwhile, Wall et al. (2014) and Ogawa et al. (2013) found no effect of ocean acidification on the severity of thermally induced bleaching after fourteen days in Seriatopora caliendrum and Acropora formosa, respectively. <br></div>