An aerial survey has shown that the coral bleaching is sweeping across the reef for the third time in five years.
The 345,400 sq km World Heritage-listed coral network has been devastated by four coral bleaching events since 1998.
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Fish and coral have a codependent relationship, the fish rely on the reef to evade danger and lay eggs.
91 percent of the coral reef had been bleached at least once during three bleaching events of the past two decades
Unlike corals that undergo bleaching, halos are formed when corals are healthy and thriving.
Healthy corals need 10 years to recover after major damage — ten years they probably don't have.
The insides of a particularly long-living genus of corals, Porites, led to the new finding.
Every year, more than two million snorkel-wielding tourists head to the Great Barrier Reef.
Experts called "for a change in our views of sharks and a change in policy to reflect that."
The RangerBot has an eight-hour battery life is able to map reef areas at very small scales.
Worldwide, coral reefs in shallow waters are among ecosystems most threatened by climate change.
Experts have warned that deforestation increases runoff into the reef, reducing water quality and light.
The Great Barrier Reef has overcome near-extinction situations five times, but faces the most severe stress in more acidic oceans today
Great Barrier Reef is reeling from successive bouts of coral bleaching due to warming sea temperatures linked to climate change.
In the millions of years of their existence, coral reefs have never faced such a combined onslaught of stressors at such a pace as they do today.
The World Heritage-listed reef is the largest living structure on Earth and its economic and social value was calculated for the first time.
Australia's iconic Great Barrier Reef has experienced widespread coral decline and habitat loss than previously thought
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Sydney: Scientists have discovered the remnants of a massive undersea landslide on the Great Barrier Reef off the coast of Australia, which occurred more than 300,000 years ago, a media report said on Wednesday.
'Weed-like' algae is killing corals in Australia's iconic Great Barrier Reef because of increased carbon dioxide levels in the atmosphere, a new study has warned.