Scientists Outplant Experimental ‘Flonduran’ Corals in Florida’s Dry Tortugas National Park

Nearly three dozen young lab-grown elkhorn corals, including a pioneering hybrid variety dubbed “Flondurans,” have been transplanted onto reefs in Florida’s Dry Tortugas National Park, marking a significant step in coral restoration efforts amid rapidly warming oceans. The outplanting initiative, conducted this spring, introduces a genetically resilient cross-breed of Florida and Honduran elkhorn corals to a remote marine sanctuary some 70 miles west of Key West. This marks the first deployment of these experimental hybrids in the park, a region known for its biodiverse but increasingly threatened coral ecosystems. Researchers believe that this selective breeding could enhance coral resilience to rising sea temperatures and disease, which have devastated reefs across the Caribbean and Florida over the past decade.

The Dry Tortugas, part of the Florida Keys National Marine Sanctuary, is a critical but fragile ecosystem where elkhorn coral—once a dominant reef-builder—has declined by over 90% since the 1980s due to climate change, pollution, and coral bleaching events. The newly outplanted corals, raised in controlled nursery environments, represent a blend of local and regional genetic lines designed to combine the hardiness of Central American corals with the ecological adaptability of Florida species. Scientists involved in the project, led by researchers from the University of Miami and Mote Marine Laboratory, have emphasized that these hybrids are part of a broader strategy to test whether assisted evolution can help restore degraded reefs before they collapse entirely.

Recent data from NOAA indicates that Florida’s reef tract has experienced multiple mass bleaching events in the past five years, with recovery prospects dimming as ocean temperatures continue to rise. In 2023, record-high sea surface temperatures triggered widespread bleaching across the Caribbean, including the Florida Keys, where over 90% of surveyed corals showed signs of thermal stress. The introduction of Flonduran corals follows a series of experimental nurseries and selective breeding programs initiated across the region, including efforts in the Florida Keys and Puerto Rico, where scientists have been cultivating heat-resistant genotypes for outplanting.

While the long-term success of these corals remains uncertain, the project underscores a growing recognition that passive conservation is no longer sufficient in the face of accelerating climate change. Restoration ecologists are increasingly turning to genetic intervention and human-assisted adaptation as essential tools in reef survival. If successful, the Dry Tortugas outplanting could serve as a model for similar efforts worldwide, offering a glimmer of hope for coral reefs that are among the planet’s most vulnerable ecosystems.