Population outbreaks of the coral eating starfish Acanthaster planci have been responsible for 42% of the over 50% decline in coral cover on the Great Barrier Reef between 1985 and 2012.
MacDonald reef before cyclone damage.
MacDonald reef after cyclone damage.
Crown-of-thorns and cyclone damage.
Bleaching at Halfway Island.
Bleaching at North Kepplel.
Live Science Staff,
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