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Severely bleached corals fully recovered within seven weeks after brief contact with healthy clones.
Tissue connections transferred beneficial algae and nutrients, which entered bleached corals within three days.
Just five to seven days of contact sufficed; transplanted algae multiplied rapidly, powering recovery.
The finding offers reef-restoration hope, but scaling it requires alternatives to matching every coral genetically.
A brief touch, a striking recovery
Bleached corals may look lifeless. Yet some are still alive—and may be able to recover. In a laboratory study published Oct. 14 in Science Advances, researchers placed severely bleached coral fragments against healthy fragments from the same coral colony.
The result was remarkable. All five bleached fragments that touched a healthy match recovered within seven weeks. All five kept apart died. The small experiment offers a promising lead, not a reef-wide cure.
How the corals helped each other
When matching coral fragments touched, their tissues fused. Tiny channels formed between them, allowing beneficial algae to move into the bleached coral. Those algae provide much of the energy corals need to survive.
Researchers saw algae transfer within three days. In some tests, five days of contact was enough. Once inside, the algae multiplied quickly and helped restore the coral’s energy supply.
Hope, with limits
The finding could inform future reef-restoration efforts. Reefs support fishing and tourism, and help shield coastlines from waves. Their health can affect both local livelihoods and the places people call home.
However, this method depends on finding a healthy coral that is genetically identical to each damaged one. That would be difficult across large reefs. Researchers are now exploring ways to deliver helpful algae without direct contact. Meanwhile, reducing climate-driven heat waves remains essential: a faster path to recovery cannot replace preventing the damage in the first place.
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