Oil in undersea canyon near Fla. panhandle

Plumes of Gulf oil spreading east on sea floor
By the CNN Wire Staff
August 17, 2010 -- Updated 0748 GMT (1548 HKT)

Oil has turned up at the bottom of the Gulf in an undersea canyon 40 miles from the Florida Panhandle, researchers said.

(CNN) -- A new report set to be released Tuesday renews concerns about the long-term environmental impact of the Gulf Coast oil disaster, and efforts to permanently plug the ruptured BP oil well have been delayed again.

Researchers at the University of South Florida have concluded that oil from the Deepwater Horizon spill may have settled to the bottom of the Gulf of Mexico further east than previously suspected -- and at levels toxic to marine life.

Initial findings from a new survey of the Gulf conclude that dispersants may have sent droplets of crude to the ocean floor, where it has turned up at the bottom of an undersea canyon within 40 miles of the Florida Panhandle. The results are scheduled to be released Tuesday, but CNN obtained a summary of the initial conclusions Monday night.

Plankton and other organisms at the base of the food chain showed a "strong toxic response" to the crude, and the oil could well up onto the continental shelf and resurface later, according to researchers.

"The dispersant is moving the oil down out of the surface and into the deeper waters, where it can affect phytoplankton and other marine life," said John Paul, a marine microbiologist at USF.