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The northern and central parts of the Great Barrier Reef have shown the largest coral growth since monitoring began 36 years ago.
But the coral cover in the southern part of the reef has declined.
Young corals are particularly vulnerable, officials say, meaning progress could be quickly reversed by climate change and other threats.
Every year, the Australian Institute of Marine Science (Aims ) surveys the condition of the reef using aerial photography and divers towed slowly on a boat.
In March, the fourth mass bleaching event in six years was recorded. Bleaching occurs when corals are stressed by warm water and crowd out the algae living inside them, which give the corals their color and keep them alive.
discoloration", — said chief executive Paul Hardisty.
Only two mass bleaching events had been reported prior to 2016.
The latest results indicate that the reef may recover if conditions permit.
The Great Barrier Reef was inscribed as a World Heritage Site 40 years ago because of its “great scientific and biological significance”; as an ecosystem with a unique and richest biodiversity in the world.
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