Great Barrier Reef coral bleaching at 95 per cent in northern section, aerial survey reveals – ‘This will change the Great Barrier Reef forever’Posted by Jim at Tuesday, March 29, 2016
By Peter McCutcheon
28 March 2016
(ABC News) – An aerial survey of the northern Great Barrier Reef has shown that 95 per cent of the reefs are now severely bleached — far worse than previously thought.
Professor Terry Hughes, a coral reef expert based at James Cook University in Townsville who led the survey team, said the situation is now critical.
"This will change the Great Barrier Reef forever," Professor Hughes told 7.30.
"We're seeing huge levels of bleaching in the northern thousand-kilometre stretch of the Great Barrier Reef."
Of the 520 reefs he surveyed, only four showed no evidence of bleaching.
From Cairns to the Torres Strait, the once colourful ribbons of reef are a ghostly white.
"It's too early to tell precisely how many of the bleached coral will die, but judging from the extreme level even the most robust corals are snow white, I'd expect to see about half of those corals die in the coming month or so," Professor Hughes said.
Coral bleaching is caused by abnormally high sea temperatures that kill the tiny marine algae essential to coral health.
This is the third global coral bleaching since 1998, and scientists have found no evidence of these disasters before the late 20th century.
"We have coral cores that provide 400 years of annual growth," explains Dr Neal Cantin from the Australian Institute of Marine Science.
"We don't see the signatures of bleaching in reduced growth following a bleaching event until the recent 1998/2000 events." […]
Professor Justin Marshall, a reef scientist from the University of Queensland, said the reason for these bleaching events was clear.
"What we're seeing now is unequivocally to do with climate change," he told 7.30.
"The world has agreed, this is climate change, we're seeing climate change play out across our reefs."
Professor Hughes said he is frustrated about the whole climate change debate.
"The government has not been listening to us for the past 20 years," he said.
"It has been inevitable that this bleaching event would happen, and now it has.
"We need to join the global community in reducing greenhouse gas emissions.
"For me, personally, it was devastating to look out of the chopper window and see reef after reef destroyed by bleaching.
"But really the emotion is not so much sadness as anger.
"I'm really angry that the government isn't listening to us, to the evidence we've been providing to them since 1998." [more]