The 27–year decline of coral cover on the Great Barrier Reef and its causes

A 27-year decline in coral cover on the Great Barrier Reef, from 28.0% to 13.8%, was driven primarily by tropical cyclones (48%), crown-of-thorns starfish predation (42%), and bleaching (10%), resulting in a mortality rate of 3.38% per year. Despite this decline, the northern region remained stable, and reefs demonstrated substantial recovery potential at 2.85% per year without these stressors. Reducing crown-of-thorns starfish populations through improved water quality and alternative control measures could mitigate further decline, but only if climate conditions are stabilized to curb increasing losses from bleaching and cyclones.

De’ath, G., Fabricius, K. E., Sweatman, H., & Puotinen, M. (2012). The 27–year decline of coral cover on the Great Barrier Reef and its causes. Proceedings of the National Academy of Sciences, 109(44), 17995–17999. https://doi.org/10.1073/pnas.1208909109