A Decade-Long Experiment Is Unlocking the Mysteries of the Ocean’s ‘Deep Reefs’
Scientists are exploring the 'mesophotic' coral ecosystems, a mysterious twilight zone located 30 to 150 meters below the ocean surface. Researchers are retrieving long-term experiments to better understand these reefs and determine if they serve as a refuge for shallower marine life.
Why it matters
Understanding these deep reefs is critical for marine conservation and biodiversity, as they remain one of the least explored frontiers on the planet.
Palau is famous for its spectacular and rich coral reefs. But these divers were planning to descend past those sun-lit marine communities and down into a lesser-known twilight zone known as the “mesophotic coral ecosystem.”
Mesophotic essentially means “middle” and “light,” which is where these ecosystems are—not quite in the bright daylight, not quite in the profound darkness, but somewhere in between. For simplicity’s sake, we’ll call these communities, which range from some 30 meters to 150 meters below the surface, the “deep reefs.”
One of the divers on the boat with me was a zoologist and curator at the California Academy of Sciences named Luiz Rocha, who has spent decades studying these deep reefs and their secrets.
“Anything between 30 meters and 150 meters is really, really unknown,” he told me.
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