New: Scientists have confirmed that much of the DDT dumped decades ago in Southern California coastal waters near Catalina Island remains in its most potent form in startling high concentrations, spread across a wide swath of seafloor.
DDT was banned 50 years ago, but its toxic legacy continues to affect the California marine ecosystem and threaten various animal species., has been mapping and collecting samples of the seafloor between the Los Angeles coast and Catalina.
“Trawls, cable lays could reintroduce this stuff back up to the surface,” Valentine said. “And animals feeding — if a whale goes down and burrows on the seafloor, that could kick stuff up.” On a chilly winter morning in between two storms, Valentine and a team of students boarded the RV/Yellowfin and set out to collect more seafloor samples along key points of a hot-spot map that they’ve been piecing together.
Sediment samples — collected from the seafloor where DDT was dumped decades ago off the coast of Catalina — are organized into jars in a lab at UC Santa Barbara.Thursday’s research updates included plans for the next Scripps mapping expedition, which will scan the seafloor with advanced sonar technology and also take hundreds of thousands of photos.
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