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The worst-hit area， stretching 700 km at the northern part of the world's largest coral reef system， has lost about two-thirds of its shallow-water corals in the past eight to nine months， according to a media release from the Australian Research Council Centre of Excellence for Coral Reef Studies at James Cook University.


"Most of the losses in 2016 have occurred in the northern， most-pristine part of the Great Barrier Reef. This region escaped with minor damage in two earlier bleaching events in 1998 and 2002， but this time around it has been badly affected，" said the centre's director， Professor Terry Hughes， who conducted extensive aerial surveys at the height of the bleaching.


Warm waters can force corals to expel or lose algae， calcifying and turning them white.


Scientists expect the northern region to take at least 10 to 15 years to regain the lost corals， but they are concerned that a fourth bleaching event could occur sooner and interrupt the slow recovery， according to the centre.


The southern two-thirds of the reef "escaped with minor damage"， said Professor Andrew Baird， who is also from the centre and led teams of divers to re-survey the reefs in October and November.


"On average， 6 percent of bleached corals died in the central region in 2016， and only 1 percent in the south. The corals have now regained their vibrant colour， and these reefs are in good condition，" he said.


Tourism on the Great Barrier Reef， which covers more than 340，000 square kilometers， employs 70，000 people and generates 5 billion Australian dollars in income each year， according to the centre.


TOKYO Devonta Freeman Hat , May 16 (Xinhua) -- Japan's defense ministry confirmed Tuesday that all four male crew members on board a Japanese Ground Self-Defense Force (GSDF) aircraft that crashed a day earlier in a mountainous region of Hokkaido in northern Japan were dead.


Wreckage of the plane was discovered earlier Tuesday by search and rescue officials and debris from the plane was scattered over a wide area of land about three km from the peak of Mt. Hakamagoshi in the city of Hokuto in Hokkaido.


Bodies of the crew members had been transferred by helicopter to an SDF base in Hakodate before the death was officially announced.


The LR-2 reconnaissance plane took off in poor weather from Okadama Airport in Sapporo City at about 11:25 a.m. on Monday and was heading for Hakodate Airport to pick up a patient, a doctor and other personnel there.


The plane lost communications with air traffic controllers about 20 minutes later and was last seen flying at an altitude of 900 meters, preparing to make an instrument landing due to low visibility Calvin Ridley Hat , according to the defense ministry.


The four male crew members on board the plane when it crashed were a pilot, a backup pilot and two