Star Island Seawall Collapse & Coral Rescue
As reported in the Miami New Times, in June 2022, a combination of heavy rains and an ancient crumbling seawall in the process of reinforcement along Star Island’s southwest corner resulted in its collapse. The collapse was discovered by our colleagues at NOAA who arrived there by boat to study the nature and resilience of the urban corals in North Biscayne Bay. This is in addition to sites on the north and south side of the MacArthur Causeway and the east end of PortMiami near the Coral City Camera. Brain corals from these sites were analyzed and published ‘Molecular Mechanisms of Coral Persistence Within Highly Urbanized Locations in PortMiami’ in 2021, the first paper of its kind to offer an explanation for the success of these corals compared to their offshore counterparts.
Coral Morphologic first began exploring these urban habitats after documenting an unusual Acropora sp. inside Government Cut in 2009 which totally upended the idea of what an ‘ideal’ habitat was for these endangered stony corals. We subsequently started exploring areas deeper in North Biscayne Bay and found surprisingly robust populations of reef building corals. When a historic cold snap in January 2010 left them unphased (while the Florida Keys nearshore corals were all but wiped out), we began to suspect that the corals in these habitats were truly special, and scientifically valuable for research.
Colin first observed the Star Island seawall on Feb 14th 2013 when Gloria Estefan’s son Nayib asked him to document the marine life living along their riprap seawall (she was so happy to learn how healthy it was!). He was amazed by the life on these rocks, and how many more fish there were around them then on the neighboring seawall that lacked riprap. But upon closer inspection there were several very large Orbicella faveolata encrusted directly on it and multiple large brain corals at the base of it. This seawall at 40 Star Island Drive was likely the oldest seawall in Miami, possibly dating back to its development in the 1920s.
When the SCTLD (Stony Coral Tissue Loss Disease) outbreak took off in 2015 we observed that these urban corals seemed to be more resistant to it, and would often survive with partial mortality. With these anecdotal observations, Dr. Ian Enochs of NOAA reached out to us about setting up a formal investigation to see how these corals might differ from their offshore counterparts.
In early 2020 with the launch of the Coral City Camera, the CURES (Coral Urban Research Experimental Site) nursery was set up within view at the east end of Port Miami where research continues to this day (and now serves as an experimental research site for Rescue a Reef to ‘stress adapt’ their corals to help find more resilient strains that will be useful in the restoration of Miami’s nearshore reefs).
After NOAA and the University of Miami performed the rescue of the corals at 40 Star Island in July, they repatriated a number of them to an offshore ‘Spawning Hub’ on Rainbow Reef where they will be able to spawn with other members of their species and hopefully provide some other their resilient genetics and microbiome to the next generation. Fifteen colonies and fragments of corals were also brought to the Coral City Camera site at PortMiami where they were cemented down by UM scientists. Several weeks later, all these transplanted corals have survived and appear to be settling in nicely to their new urban coral community.
Update 11/2/22: Watch a follow-up feature on the seawall collapse and coral rescue with ABC WPLG Local 10 anchor / reporter Louis Aguirre: