New studies show that the unprecedented bleaching events of the Great Barrier Reef have made firmer corals more resistant to stress.
It is described as an example of "ecological memory" and "silver lining" for the buried ecosystem.
The Great Barrier Reef Corals, which survived bleaching in 2016, are much more resistant to a second hot wave next year, according to researchers at James Cook University.
"The answer to the heat exposure reef in the second year depended in part on her experience a year earlier," he said leading researcher Terry Hughes.
"We can no longer assume that future bleaching events, say a decade or two, will have the same effect they have now because of these changes in physiology in the mix of species," he says said ABC.
Bleaching occurs when coral is effectively prepared in warming water. Changing the temperature of the seashore causes the coral to emit small photosynthetic algae by draining them out of color.
The good news is that bleached reefs are not dead reefs.
Corals can recover if the water temperature drops and the algae can be recolonized.
According to the study, the northern part of the Great Barrier Reef is most affected in 2016, but has been bleached much less in 2017 despite a similar heat stress level.
Central regions have had the same level of bleaching in both years.
While the southern region, which was least affected in 2016, did not show any bleaching in the second year.
Hughes called the finding "surprising."
READ MORE: We Ban Sunscreens: The Pacific Island Conservation Village of Tourists
While the study suggests that coral is healed, it is far from being immune to corrosion bleaching.
Scientists are now nervously waiting until next March when another bleaching event may occur in response to peak summer temperatures.