In 2023, a marine heat wave settled over Palmyra Atoll, a remote ring of coral islands about 1,000 miles south of Hawaii, and stayed for more than half a year. Some of the reef's most vibrant corals turned white. Joe Pollock of The Nature Conservancy, who monitors the reef, admitted he didn't know if it would come back. Three years later, he put his face in the water and found the reef floor covered in baby corals.
In this episode, I break down why Palmyra recovered when so many reefs struggle. It comes down to an intact food web: parrotfish that graze algae off the reef, a bubblegum-pink crustose coralline algae that holds space for young corals, and sharks that keep the whole system in balance. Then we travel to Tsitsikamma, Africa's oldest marine protected area, where Rhodes University researchers found that protected red roman stayed active through an extreme cold spell while fished populations slowed down.
Protected areas buy reefs time, and cutting emissions decides how much time they need. I close with one simple action you can take this year: submitting a short comment of support the next time a marine protected area consultation opens in your region. Here's the template from the episode, ready to copy and paste: "I support protecting this area because intact ecosystems recover faster from heat waves. Please give science-based protections full weight."
Takeaways
Bleached coral is starving, not dead, and can recover if the heat breaks in time
Palmyra's reef recovered with a "sea of baby corals" whose parents survived the 2023 bleaching
Corals that survive bleaching often tolerate heat better and can pass that tolerance to offspring
Parrotfish, crustose coralline algae, and sharks form the "crew of three" that keeps a reef ready to recover
Protected red roman in South Africa kept moving through a cold spell that slowed fished populations
At 1.5°C of warming, 70 to 90% of coral reefs are projected to decline, so emissions cuts remain the primary fix
One two-sentence comment on an MPA consultation counts
Important Links and Calls to Action
Copy-and-paste comment for your next MPA consultation: "I support protecting this area because intact ecosystems recover faster from heat waves. Please give science-based protections full weight."
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