Gizmodo reports:
Roughly 84.4% of the world's coral reefs suffered bleaching-levels of heat stress during the last major marine heat wave from January 2023 to September 2025, with over half already lost compared to coral coverage in the 1950s... But there's some good news, thanks to a new study published this Wednesday in the journal Science Advances: Marine ecologists at Stanford have discovered that bleached corals can be revived via contact with a healthy coral neighbor, who (like a good neighbor) shares their photosynthetic, symbiotic algae (Symbiodiniaceae) with their peers.
"This incredible new result — that fast and full recovery is possible in bleached coral — can inspire solutions that eventually may be scalable," [Fiorenza Micheli, a marine ecologist with Stanford's Center for Ocean Solutions and study co-author, told the journal Nature]... Unlike their controls, bleached coral in contact with healthy coral recovered in just eight weeks... [T]he surprise discovery of this method alongside the other techniques that marine conservationists are now actively pursuing — including the successful deep-freezing and revival of at-risk coral sampled from Hawaii — could offer threatened reefs the lifeline they need. Coral contact could super-charge other efforts, like the selective breeding of heat-tolerant corals and the cultivation of protected coral nurseries
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