Climate change is one of the greatest threats facing coral reefs around the world today.
Events linked to global warming have damaged the Great Barrier Reef to such an extent that the ability of its corals to recover from shocks has been severely disrupted.
This is not immediately fatal to the corals, because they can reabsorb the zooxanthellae. But if the stressful conditions persist for too long, they die. They found that coral replenishment in 2018 had been severely depleted by the loss of breeding adults, while the mix of baby corals had also shifted, according to Hughes. This reduced rate of recovery could have significant implications for the reef’s ability to cope with future stress events, escalating the risk of “widespread ecological collapse of current ecosystems,” the authors wrote in the study.
"It's highly unlikely that we could escape a fifth or sixth event in the coming decade," co-author Morgan Pratchett said in a statement."We used to think that the Great Barrier Reef was too big to fail—until now. For example, when one part was damaged by a cyclone, the surrounding reefs provided the larvae for recovery.”
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