Palmyra Atoll's coral reef survived more than six months of heat and coral bleaching in 2023, and its coral reef recovery since then is giving scientists a blueprint for reefs around the world. When Joe Pollock of The Nature Conservancy went back to survey the reef, he found "an absolute sea of baby corals." Those young corals came from adults that made it through the heatwave, and they may have inherited some of their parents' heat tolerance.
Andrew Lewin takes you to Palmyra, a remote atoll about 1,000 miles south of Hawai'i with no permanent residents. People have left their mark here, from likely Polynesian visits to World War II runways and roads. Since The Nature Conservancy acquired it in 2000, Palmyra has become a national wildlife refuge, joined the Pacific Remote Islands Marine National Monument in 2009, and had its invasive rats removed in 2011. Decades with almost no fishing, pollution or coastal development have made it one of the healthiest coral reefs left on the planet, and a reference point for what a reef looks like when people get out of its way. Andrew also explains how coral bleaching works and why a bleached coral can still recover.
Researchers point to three links that let Palmyra heal: predators like blacktip reef sharks, grazers like parrotfish, and a bubblegum-pink seaweed called crustose coralline algae that baby corals love to settle on. Restoration teams in Florida, Puerto Rico, Maui and Belize are already rebuilding those links. Andrew is also clear about the limits. Recovery on Palmyra was uneven, and the IPCC projects that 70 to 90% of coral reefs won't survive warming beyond 1.5°C. Next time you see a reef headline, ask one question: does that reef still have what Palmyra has?
Chapters:
0:00 - A Reef Under Six Months of Heat
1:38 - The Nature Conservancy Steps In
3:35 - Why Here?
5:11 - The Limits: Uneven Recovery
6:37 - The Reefs Worth Fighting For
Takeaways:
Palmyra Atoll's coral reef bleached after more than six months of heat stress in 2023, then filled with baby corals.
The young corals came from adults that survived the heat and may carry some of their heat tolerance.
Bleached coral is starving and stressed, and it can recover if the water cools in time for its algae to move back in.
Palmyra has had decades with almost no fishing, pollution or coastal development, making it a scientific reference point for healthy reefs.
Three links help the reef heal: sharks protect the grazers, parrotfish clear space, and pink crustose coralline algae holds it open for baby corals.
Florida, Puerto Rico, Maui and Belize are using Palmyra's lessons with king crabs, sea urchins and the Super Reefs approach.
Recovery on Palmyra was uneven, and scientists are still working out why.
Restoration needs climate action to work. The IPCC projects 70 to 90% of reefs lost beyond 1.5°C of warming.
You can help by supporting shark and fish protections, marine protected areas, food-web restoration, and climate action.
Catch Ocean Decoded Live Monday to Thursday at 5pm Eastern, hosted by Andrew Lewin. Subscribe and hit the bell. Go deeper with the How to Protect the Ocean and Beyond Jaws podcasts.
#OceanConservation #MarineBiology #SaveOurOceans #ProtectTheOcean #OceanAwareness #BluePlanet #ConservationMatters #ScienceForChange #SustainableOceans
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