Egypt's Red Sea corals have long been described as "super corals" for their unusual tolerance to rising water temperatures, but heat waves in 2023 and 2024 strained that reputation. A survey led by Mahmoud Hanafy of Suez Canal University found bleaching throughout the Red Sea in 2024, with less than a tenth of coral colonies affected in the north but half lost further south. The events have pushed scientists to ask not just how much heat these reefs can take, but what protected them until now.
Two explanations are on the table. Eslam Osman, a marine ecologist at KAUST, argues that the corals' evolutionary history—passing through the warm waters of the Bab al-Mandab Strait—filtered for heat-tolerant species and genotypes. Hanafy places more weight on water circulation, noting that current shifts in the northern Red Sea bring cooler water to the surface. He points to unusually calm seas during the 2024 heat wave as a likely factor in the bleaching. Osman accepts that calm conditions could have made things worse but insists temperature was the main issue. The two views are not mutually exclusive, but their relative importance matters for predicting future vulnerability.
There are signs of recovery: HEPCA's preliminary estimates put rebound rates at 75 to 88 percent a year after the event, far stronger than most reefs globally. The Egyptian government has designated new protected areas and partnered with the United Nations Development Program and the Global Fund for Coral Reefs on conservation and sustainable management. Osman welcomes these steps but says conservation needs stable financial resources, not a single-year effort. Hanafy is blunter: local measures can only buy time unless carbon dioxide and greenhouse gas emissions are cut. For businesses and governments with a stake in these reefs, the lesson is that resilience is not a guarantee—and protecting it will require sustained investment and climate action. This story originally appeared in WIRED Middle East. [Source: WIRED]