👍 A Slimy Calamity Is Creeping Across the Sea

The mucus floating underwater was fascinating—even beautiful—but what scientists saw on the seafloor was disturbing. They already knew that unsightly layers of the mucus could float to the surface. Now they discovered that they could also sink, covering corals, sponges, brittle stars, mollusks, and any other unlucky creatures on the seafloor, cutting them off from oxygen. “They’re literally smothered,” says Alice Alldredge, an oceanographer at UC Santa Barbara. “Sure, it’s uncomfortable for us as human beings to have all this gunk at the surface. But the bottom-dwelling organisms are going to die.” An ecosystem takes years to fully recover from such a mass mortality.