Canberra: The Great Barrier Reef is facing a critical period of heat stress over the coming weeks following the most widespread coral bleaching the natural wonder has ever endured.
David Wachenfeld, chief scientist at the Great Barrier Reef Marine Park Authority, the government agency that manages the coral expanse off northeast Australia, said ocean temperatures over the next month will be crucial to how the reef recovers from heat-induced bleaching.
“The forecasts indicate that we can expect ongoing levels of thermal stress for at least the next two weeks and maybe three or four weeks,” Wachenfeld said in a weekly update on the reef’s health.
“So this still is a critical time for the reef and it is the weather conditions over the next two to four weeks that will determine the final outcome,” he said.
Ocean temperatures across most of the reef were 0.5 to 1.5 degrees Celsius (0.9 to 2.7 degrees Fahrenheit) above the March average.
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In parts of the marine park in the south close to shore which avoided the ravages of previous bleachings, ocean temperatures were 2 to 3 degrees Celsius (3.6 to 5.4 degrees Fahrenheit) above average.
The authority has received 250 reports of sightings of bleached coral due to elevated ocean temperatures during an unusually hot February.
The 345,400-square kilometer (133,360-square mile) World Heritage-listed colorful coral network has been devastated by four coral bleaching events since 1998. The most deadly were the most recent, in consecutive summers in 2016 and 2017.
Scientists fear the latest coral death rate could match those events.
The Great Barrier Reef Marine Park Authority last year downgraded its outlook for the corals' condition from "poor" to "very poor" due to warming oceans.
Its latest report, which is updated every five years, found the greatest threat to the reef remained climate change. The other threats are associated with coastal development, land-based water runoff and human activity such as illegal fishing.
(With inputs from AP)
