Figure 1. Effects of organic enrichment and nitrate on the survival of heat-stressed and control corals.

Survival of Acropora millepora (a, b) and Montipora tuberculosa (c, d) at the end of the recovery period for the treatments of temperature (25°C (a, c) vs. 31°C (b, d), organic enrichment (+OE), and/or nitrate addition (+NO3; +OE +NO3). The horizontal bars indicate mean percent survival for each treatment; circles mark the percent of surviving colonies for each tank (four colonies per species and tank, four tanks per treatment; points are jittered for clarity).