Parts of Great Barrier Reef suffer highest coral mortality on record

Sydney: Parts of the Great Barrier Reef have suffered the highest coral mortality on record, Australian research showed Tuesday, with scientists feari...

Sydney: Parts of the Great Barrier Reef have suffered the highest coral mortality on record, Australian research showed Tuesday, with scientists fearing the rest of it has suffered a similar fate.

The Australian Institute of Marine Science said surveys of 12 reefs found up to 72 percent coral mortality, thanks to a summer of mass bleaching, two cyclones, and flooding.

In one northern section of the reef, about a third of hard coral had died, the "largest annual decline" in 39 years of government monitoring, the agency said.

Often dubbed the world's largest living structure, the Great Barrier Reef is a 2,300 kilometre (1,400-mile) expanse of tropical corals that house a stunning array of biodiversity.

But repeated mass bleaching events have threatened to rob the tourist drawcard of its wonder, turning banks of once-vibrant corals into a sickly shade of white.