Figure 6. Calcification rate of ambient vs high temperature preconditioned corals on trees, pre- and post-heat stress.

Mean growth rate of each group of ambient and high temperature preconditioned corals on the trees in six-month increments (before and after a natural warming event) for (A) M. capitata and (B) M. flabellata. For both species there was no difference in growth between ambient or high temperature preconditioned populations for either time period; temperature preconditioning treatment while in the mesocosms did not benefit growth during an ex situ warming event (M. capitata: p = 0.792; M. flabellata: p = 0.604). The calcification rate of both groups of M. capitata was greater post-heat stress (p = 0.04) while the reverse was true for M. flabellata (p = 0.002). Error bars are SE, and different letters indicate significant difference.