Abrolhos Islands Coral Survives Heatwave

Why this is here: The Abrolhos reef experienced only minimal bleaching despite water temperatures reaching 20 to 30 degree heating weeks—levels considered catastrophic, exceeding typical thresholds by almost five times.

James Cook University scientists discovered a coral reef off the coast of Western Australia withstood a severe marine heatwave in 2025. The reef, located at the Houtman Abrolhos Islands roughly 60 kilometers from Geraldton, experienced minimal bleaching while nearby Ningaloo reef suffered widespread damage. Researchers, including Kate Quigley, found the reef’s location—where temperate and tropical ecosystems meet—contributes to its resilience.

The Abrolhos reef features a unique mix of tropical and cold-water coral species, with some found nowhere else. Last year’s water temperatures reached 20 to 30 degree heating weeks, far exceeding levels previously considered catastrophic, which are typically around eight. Scientists believe only about five to ten similar coral environments exist globally.

Researchers continue to investigate the specific mechanisms behind the reef’s heat tolerance, hoping to apply those lessons to other vulnerable reefs. Understanding why this reef survives remains an open question, but its existence offers encouragement for reef conservation efforts.