Nova Southeastern University scientists develop underwater shades to protect coral reefs

Scientists from Nova Southeastern University have developed a method to protect vulnerable Caribbean coral reefs from heat-induced bleaching using temporary underwater shades. A study published in ‘Frontiers in Marine Science’ details an experiment conducted in the Florida Keys during the summer of 2024.

While the shades do not lower water temperatures, they mitigate damage by reducing ultraviolet (UV) and irradiance exposure. The researchers used custom-made parasols constructed from PVC pipe and nylon fabric, which reduced light exposure by 60%. These shades were positioned approximately 30cm above coral colonies.

The experiment focused on two species of brain coral: Pseudodiploria clivosa and Colpophyllia natans. Results indicated that the shading minimized bleaching and helped some corals recover color, suggesting improved health. Lead author Dr. Karen Neely noted that while shading offers only small-scale, temporary protection, it serves as a proof of concept for saving targeted corals during extreme heat events.