New research warns Caribbean reefs face potentially irreversible collapse after marine heatwaves slashed hard coral cover by 48% since 1980. Scientists say bleaching threatens biodiversity, tourism, fisheries and coastal protection, urging rapid, coordinated action.
Caribbean coral reefs have suffered potentially irreversible losses over the past four decades, driven mainly by intense marine heatwaves caused by climate change, according to new research.
The study found that since 1980, hard coral cover across the region has fallen by about 48 percent. Researchers warned that the collapse of coral reefs threatens the entire marine ecosystem because reefs, while covering only about 1 percent of the global ocean floor, provide habitat for nearly 25 percent of marine life worldwide.
Data from the Global Coral Reef Monitoring Network (GCRMN) shows that prolonged and severe marine heatwaves triggered by climate change have become the biggest threat to coral reefs. The heatwaves severely damage the tiny algae or microalgae living inside corals that supply most of their food and energy. Under extreme heat, the algae become toxic, prompting corals to expel them, leading to coral bleaching.
Dr Jeremy Wicquart, the study’s editor and a marine scientist, said the Caribbean faced the most severe heat-related stress in its history during 2023-2024. In recent years, the region has recorded a sharp decline in coral cover at a rate of 16.9 percent.
“I have seen it with my own eyes while diving, everything has turned white. There is not a single colourful coral,” Wicquart said. “Seeing it in the field is not the same as seeing it on a graph. When you witness it in real life, it is mentally very disturbing.”
Coral reefs are also crucial to the Caribbean economy, contributing about $6.2 billion annually through tourism and fisheries. Scientists warned that coral destruction would threaten not only marine biodiversity but also the livelihoods of millions of people and coastal protection across the region.
Experts have issued an urgent call for rapid and coordinated action to protect Caribbean coral reefs, warning that if immediate measures are not taken based on the current situation, the reefs may no longer be recoverable in the future.
