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UDaily: Active microbes discovered far beneath seafloor in ancient ocean sediment

UDaily: Active microbes discovered far beneath seafloor in ancient ocean sediment

Microbes are living more than 500 feet beneath the seafloor in 5 million-year-old sediment, according to new findings by researchers at the University of Delaware and Woods Hole Oceanographic Institution (WHOI). Genetic material in mud from the bottom of the ocean — called the deep biosphere —revealed an ecosystem of active bacteria, fungi and other microscopic organisms at depths deeper than a skyscraper is high. The findings were published in Nature on June 12.

“This type of examination shows active cells,” said co-author Jennifer F. Biddle, assistant professor of marine biosciences in UD’s College of Earth, Ocean, and Environment. “We knew that all of these cells were buried, but we didn’t know if they were doing anything.”

In fact, the microbes are reproducing, digesting food and even moving around despite the extreme conditions found there: little to no oxygen, heavy pressure and minimal nutrient sources. The organisms could shed light on how carbon and other elements circulate in the environment, the scientists reported.