Great Barrier Reef suffers third mass bleaching in five years

Warmer sea temperatures - particularly in February - are feared to have caused huge coral loss across the world's largest reef system


The corals of the Australian Great Barrier Reef have been affected by a new phenomenon of massive bleaching, the third in five years after that of 2016 and 2017. The cause would be found in the excessive rise in ocean temperatures. The announcement by the Great Barrier Reef Marine Park Autority, the Australian government agency that monitors the state of the Great Barrier Reef, comes after the alarm launched in recent days by researchers from James Cook University, who are conducting overflights over the whole area to evaluate the phenomenon.

The study is still ongoing but has already shown that the phenomenon of massive coral bleaching is affecting the areas closest to the Barrier coast in the north and areas that had not been affected by previous bleaching phenomena in the South, for what is looming be one of the worst in history.

But what exactly does bleaching consist of? Greenpeace explains this in a note: “Due to thermal stress, corals expel the algae (zooxanthellae) that live in their tissues, causing their bleaching. If the temperatures do not return to normal within 6-8 weeks, the corals die. Corals can survive a whitening phenomenon, but still undergo considerable stress “.

In 2016, 93 percent of corals in the Great Barrier Reef were subject to bleaching, and 22 percent then died, with areas severely affected by bleaching that saw up to 50 to 90 percent of corals die present.

“Climate change is threatening this unique ecosystem, putting local communities and tourism operators who depend on the conservation of the coral reef at risk, even more at this time when Covid19 puts their work at risk”, commented Giorgia Monti , seaside campaign by Greenpeace Italia.

The Great Barrier Reef is one of the best known parks in the world and contributes significantly to the Australian economy which, according to Greenpeace Australia should be more valued by not supporting the coal industry and promoting the reduction of carbon dioxide emissions, which are the main threat to the barrier.

“For years, experts have warned us about the impacts of climate change on tropical coral reefs. How many more alarm bells should we wait before making the right choices? halving greenhouse gas emissions and protecting the most sensitive areas of our seas is the only way to prevent such precious ecosystems from disappearing with serious consequences for man too “, concludes Monti.

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