We are proud to unveil the world’s longest running underwater timelapse, starting May 1st 2023 and running 619 days through January 9, 2025. This period covers summer 2023’s unprecedented coral bleaching event, and indeed multiple corals can be seen bleaching, but then recovering and growing through 2024 into 2025.
Bleaching occurs when the metabolism of the golden-brown symbiotic algae that live in the coral tissue known as zooxanthellae goes into thermal overdrive. The algae’s production of photosynthetically-produced oxygen exceeds the limit the coral can safely handle inside its tissues, resulting in expulsion of the zooxanthellae (and its brown color) from its host. Because zooxanthellae normally provide a coral with photosynthetically-produced sugars, it begins to starve without these symbionts. Fast-growing corals like the endangered staghorn (Acropora cervicornis) and elkhorn (Acropora palmata) lack the energy stores that fleshier corals like brain corals have, and die from bleaching stress much more easily.
Of greatest interest to us is the success and proliferation of the urban strain of staghorn coral (Acropora cervicornis aka ACER ‘ventura’) that not only did not bleach, but has grown swiftly. We look forward to continuing our scientific investigation into the mechanisms of their resilience, and hope to amplify this strain for the purpose of restoring Miami’s nearshore reefs.
Our ability to timelapse the growth of PortMiami’s urban corals highlights the scientific value of the Coral City Camera and its ability to document what was previously undocumented. After 5 years of near-continuous recording, and more than 210 species of fish cataloged, there is no underwater coral reef site anywhere in the world that has been as thoroughly recorded and archived.