Trophic strategy and bleaching resistance in reef-building corals

TitleTrophic strategy and bleaching resistance in reef-building corals
Publication TypeJournal Article
Year of Publication2020
AuthorsConti-Jerpe IE, Thompson PD, Wong CWai Martin, Oliveira NL, Duprey NN, Moynihan MA, Baker DM
JournalScience Advances
Date Published04/2020

Ocean warming increases the incidence of coral bleaching, which reduces or eliminates the nutrition corals receive from their algal symbionts, often resulting in widespread mortality. In contrast to extensive knowledge on the thermal tolerance of coral-associated symbionts, the role of the coral host in bleaching patterns across species is poorly understood. Here, we applied a Bayesian analysis of carbon and nitrogen stable isotope data to determine the trophic niche overlap between corals and their symbionts and propose benchmark values that define autotrophy, heterotrophy, and mixotrophy. The amount of overlap between coral and symbiont niche was negatively correlated with polyp size and bleaching resistance. Our results indicated that as oceans warm, autotrophic corals lose their competitive advantage and thus are the first to disappear from coral reefs.