Journal Article global change Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Water Pollutants, Chemical algal assemblages alternative stable states biomass coral bleaching coral recruitment coral reefs disturbance regimes ecological feedbacks ecological memory facilitation fish-derived nutrients herbivory irradiance macroalgae marine heat waves mutualisms nutrients photosynthesis positive interactions primary production resilience stress-gradient hypothesis symbiosis understory