Parts of Great Barrier Reef show highest coral cover seen in 36 years, report finds

The central and northern stretches of Australia's Great Barrier Reef are showing the highest coral cover seen in 36 years, showing that the fragile UNESCO World Heritage site could still recover from decades of damage, a monitoring group reported Thursday. Coral cover in the southern region of the reef decreased, however, and the reef is vulnerable to increasingly common disturbances like mass bleaching events, the group said.

There was an increase in average hard coral cover in the northern region of the reef to 36% in 2022 from 27% in 2021, and an increase in in the central region to 33% in 2022 from 27% in 2021, the Australian Institute of Marine Sciences (AIMS) said in its annual summary report.

Despite this, "a third of the gain in coral cover we recorded in the south in 2020/21 was lost last year due to ongoing crown-of-thorns starfish outbreaks," Dr. Paul Hardisty, CEO of AIMS, said in a statement. "This shows how vulnerable the Reef is to the continued acute and severe disturbances that are occurring more often, and are longer-lasting."