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The distribution of corals in Japan covers a wide range of latitudes, encompassing tropical to temperate zones. However, coral communities in temperate zones contain only a small subset of species. Among the parameters that determine the distribution of corals, temperature plays an important role. We tested the resilience to cold stress of three coral species belonging to the genus  Acropora  in incubation experiments.  Acropora pruinosa , which is the northernmost of the three species, bleached at 13 °C, but recovered once temperatures were increased. The two other species,  A .  hyacinthus  and  A .  solitaryensis , which has a more southerly range than  A .  pruinosa , died rapidly after bleaching at 13 °C. The physiological effects of cold bleaching on the corals included decreased rates of photosynthesis, respiration, and calcification, similar to the physiological effects observed with bleaching due to high temperature stress. Contrasting hot bleaching, no increases in antioxidant enzyme activities were observed, suggesting that reactive oxygen species play a less important role in bleaching under cold stress. These results confirmed the importance of resilience to cold stress in determining the distribution and northern limits of coral species, as cold events causing coral bleaching and high mortality occur regularly in temperate zones.

The northern limit of corals of the genus Acropora in temperate zones is determined by their resilience to cold bleaching