‘Catastrophic’: Great Barrier Reef hit by its most widespread coral bleaching, study finds | Great Barrier Reef

‘Catastrophic’: Great Barrier Reef hit by its most widespread coral bleaching, study finds | Great Barrier Reef

January 21, 2025 Catherine Williams - Chief Editor Business

Devastating Coral Loss on the Great Barrier Reef

The Great Barrier Reef is mourning a profound loss. Over 40% of its monitored corals perished last year due to the most catastrophic bleaching outbreak the reef system has ever faced. Scientists at One Tree Island, in the reef’s southern sector, witnessed this alarming decline firsthand.

Dr. Maria Byrne, a marine biologist leading the study, has been visiting One Tree Island for 35 years. The carnage she witnessed this time was staggering. "Seeing those massive colonies die was devastating," Byrne said, her voice heavy with emotion. "I’m angry. We’ve been warning about climate change for years."

The Australian Institute of Marine Science paints an equally grim picture. In the same region, coral cover plummeted by 41% – the largest annual decline since monitoring began in the 1980s. Similar devastation extends to the north, where one scientist likened the scene to a "graveyard of corals."

Byrne and her team tracked 462 coral colonies, recording every white cap and every death. By July, nearly half the colonies were gone, succumbing to the heat stress. Even the hardy, long-lived Goniopora genus wasn’t spared; bleached and afflicted by a flesh-eating disease known as black band, these colonies crumbled too.

"We were expecting this," admits Dr. Shawna Foo, another researcher on the island, "but it’s still hard to recognize many of the colonies now, covered in algae, dead, or crumbling."

Worse still, the US government’s Coral Reef Watch program hints at more bleaching this summer, with parts of the reef north of Cooktown already under heat stress.

Richard Leck, oceans head at WWF-Australia, calls the situation "Russian roulette." With increasing heat stress and major mortality rates, the reef’s future hangs in the balance.

Now, the world waits for Australia’s upcoming UNESCO report on the reef’s condition. Leck insists on accurate representation and renewed efforts to protect our fragile underwater treasure.

The reef weeps, and scientists grapple with despair and determination. The battle for the Great Barrier Reef rages on.