CORAL SYMBIONTS. "The algal symbiont, Symbiodinium, provides up to 60% of the nutrients needed by its host coral (the term “host” is used here in the classical sense to denote the larger, eukaryotic, multicellular organism in which the “symbiont” resides). When this symbiosis is broken by a prolonged increase in sea-surface temperatures, corals “bleach.” They lose their algal symbionts and die." View in LinkedIn