Most Severe Coral Bleaching Documented on GBR

Aerial surveys of more than 500 coral reefs from Cairns to Papua New Guinea reveal that the most pristine section of the Great Barrier Reef is currently experiencing the worst, mass bleaching event in its history, James Cook University informed.

“This has been the saddest research trip of my life,” says Prof. Terry Hughes, convenor of the National Coral Bleaching Taskforce. “Almost without exception, every reef we flew across showed consistently high levels of bleaching, from the reef slope right up onto the top of the reef. We flew for 4000 km in the most pristine parts of the Great Barrier Reef and saw only four reefs that had no bleaching. The severity is much greater than in earlier bleaching events in 2002 or 1998.”

Multiple research vessels and island research stations are documenting the coral bleaching, with in-water research confirming what is  seen from the air, that the majority of reefs north of Cairns are undergoing bleaching and that virtually all species of corals are being affected.

“We could see extensive bleaching even among the most robust ‘massive’ corals,” says James Kerry, Project Manager of the National Coral Bleaching Taskforce, who also participated in the aerial surveys. “The fact that these hardy species have also turned white shows just how severe summer conditions have become on the northern GBR.

“Scientists in the water are already reporting up to 50% mortality of bleached corals,” says Prof. Hughes, “but it’s still too early to tell just what the overall outcome will be. We will continue to conduct underwater surveys along the Great Barrier Reef in the coming months as the full impact of this mass bleaching event unfolds.”