by Courtney Mattison

Two new studies provide evidence that the Deepwater Horizon oil disaster has harmed coral ecosystems in the Gulf of Mexico’s mesophotic or “twilight” zone along a series of deep-water rocky reefs known as the Pinnacle Trend. Located approximately 200-300 feet below the surface at the edge of the continental shelf of Louisiana, Mississippi and Alabama, this region’s mesophotic (or “middle light”) zone supports vibrant fish, coral and sponge communities in the Gulf. 
In their latest study published last month in the journal Coral Reefs, researchers from the National Oceanic and Atmospheric Administration (NOAA), Florida State University, and JHT Inc. compared the health of corals on hard-bottom mesophotic reefs before and after the Deepwater Horizon oil disaster using video footage and images taken by remotely operated vehicles (ROVs).…