Researchers are testing whether cross-breeding elkhorn corals from Florida and Honduras can help restore lost genetic diversity and improve the threatened species’ ability to withstand warmer waters.By Teresa TomassoniNearly three dozen young lab-grown elkhorn corals were outplanted onto reefs in Florida’s Dry Tortugas National Park this spring, including a group of ‘Flondurans,’ marking the first time this experimental cross-breed of Florida and Honduran elkhorn corals was introduced to the remote park about 70 miles from Key West.