Coral Restoration Foundation opens second in-water gene bank as heat risk rises

Coral Restoration Foundation has started duplicating its in-water coral gene bank across two ocean sites in the Florida Keys as NOAA warns of rising heat stress through 2027. The move is designed to protect genetic diversity from another severe bleaching event after Florida’s reefs were devastated in 2023.

Why it matters: - Coral Restoration Foundation is trying to protect the genetic backbone of Florida’s coral recovery before another heat wave wipes out more reef stock. - The new backup gene bank adds redundancy at a time when NOAA says the Florida Keys face elevated bleaching risk and El Niño is strengthening. - Preserving founder genotypes of staghorn, elkhorn and other corals could determine how much restoration material remains available after future mortality events.

What happened: - Coral Restoration Foundation established a second in situ gene bank at its Elbow Nursery in Tavernier, Florida. - The first transfer moved about 1,000 corals representing 130 genotypes from Tavernier Nursery to Elbow across two coordinated dives. - The transfer is the first phase of a larger plan to move about 3,500 corals to Elbow and fully replicate the genetic diversity now held at Tavernier. - The work is part of CRF’s bleaching response plan and a bet-hedging strategy to avoid relying on one in-water site.

The details: - The first group prioritized founder genotypes of Acropora cervicornis, or staghorn coral, and Acropora palmata, or elkhorn coral, from Florida’s Coral Reef. - The transfer also included most of CRF’s Orbicella corals. - Founder genotypes are the original genetically distinct corals collected from wild Florida Reef populations and used as the genetic base of CRF’s nursery population. - CRF now has in situ gene banks at both Tavernier and Elbow Nurseries, alongside land-based genetic banking at The Reef Institute in West Palm Beach. - In 2023, researchers documented mortality of 98% to 100% among wild elkhorn and staghorn corals around the Florida Keys and Dry Tortugas during the Fourth Global Bleaching Event. - A 2025 NOAA-led study in Science described those losses as the functional extinction of the two species from Florida’s Coral Reef. - NOAA Coral Reef Watch currently places the Florida Keys in old Bleaching Alert Level 2, where mortality of heat-sensitive coral species becomes likely. - The Degree Heating Week index for the Florida Keys reached 14.44°C-weeks as of Aug. 17. - NOAA modified its bleaching alert scale after Florida saw an unprecedented 24 DHW in 2023, extending the scale to Alert Level 5. - Under the revised scale, 14.44 DHW places the Florida Keys in Alert Level 3, which signals a higher risk of reef-wide multi-species mortality. - NOAA says El Niño is strengthening, with more than a 90% chance it becomes a very strong event during fall and winter 2026-27. - NOAA also says there is a 69% chance El Niño strength from October to December exceeds previous events in the record dating back to 1950. - The remaining transfers will depend on reef conditions and how heat stress develops in the coming weeks. - Around 29 divers and four boats supported the transfer effort. - The core transfer team worked from a Rainbow Reef charter vessel, while CRF boats supported operations at both nurseries. - The Elbow site has greater water movement than Tavernier, which can influence the water around a coral and sometimes reduce the physiological effects of heat stress. - Research has found higher-flow environments can lessen some damage from elevated temperature, although flow is only one factor in whether a coral bleaches or survives. - Acropora palmata at nearby Elbow Reef survived previous bleaching events, including the Fourth Global Coral Bleaching Event.

Between the lines: - CRF is building geographic redundancy because a single nursery can fail when temperatures spike across a region. - The Elbow site also doubles as a natural test bed for whether higher flow and local conditions offer any resilience advantage during bleaching season. - Dr. Phanor Montoya Maya, CRF Restoration Program Manager, said the foundation cannot control ocean temperature but can reduce the risk of losing important genetic stock. - The new site will let CRF compare how species and genotypes perform in different environments over time.

What's next: - CRF will continue moving coral stock to Elbow if conditions allow. - CRF will begin regular nursery maintenance at Elbow and monitor coral performance through the rest of the bleaching season and beyond. - The results could shape future nursery management if the site proves to offer even partial protection during heat stress.

The bottom line: - CRF is treating coral genetics like a portfolio under climate risk: spread the assets, reduce single-site exposure and preserve options before another summer turns deadly.