From an article in Yahoo! News: “Antarctica, the coldest place on Earth, teems with microscopic life. Tiny organisms dwell on the ice and live inside glaciers, and now, researchers confirm, a rich microbial ecosystem persists underneath the thick ice sheet, where no sunlight has been felt for millions of years. Nearly 4,000 species of microbes inhabit Lake Whillans, which lies beneath 2,625 feet (800 meters) of ice in West Antarctica, researchers report today (Aug. 20) in the journal Nature. These are the first organisms ever retrieved from a subglacial Antarctic lake.
“We found not just that things are alive, but that there’s an active ecosystem,” said lead study author Brent Christner, a microbiologist at Louisiana State University in Baton Rouge. “If you had to think up what would be the coolest scenario for an ecosystem in Antarctica, you couldn’t make this up.” Antarctica has nearly 400 lakes trapped under its ice sheet. Some of them — like Lake Whillans — are connected by rivers and streams. Others are deep, isolated basins like Lake Vostok, where drillers have yet to successfully recover uncontaminated water samples. The new Lake Whillans discovery raises scientists’ hopes that these other hidden waterways also carry life.
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“This is a landmark paper for the polar sciences,” said Martyn Tranter, a glaciologist at the University of Bristol in the United Kingdom, who was not involved in the study. “This paper is bound to stimulate further calls for subglacial lake research.”
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Drillers broke through to Lake Whillans in January 2013, after years of planning and more than $10 million spent by the National Science Foundation. The team, called WISSARD, used a custom hot-water drill with its own decontamination system. Within a day of pulling out the tea-colored water, tests done in a temporary lab confirmed the lake sparked with life.
Researchers returned to the United States with 8 gallons (30 liters) of lake water and eight sediment cores from the lake bottom. Scientists at Montana State University, the University of Tennessee and other institutions parsed out the precious samples, growing cultures of different cell types and sequencing the DNA. The results show evidence for 3,931 species of single-celled life in Lake Whillans. “We were surprised about the number of organisms,” Christner said. “It’s really not that different than the number of organisms in a lake on the surface.”
Living without sunlight, all of the lake organisms rely on minerals in the water and lake muck for the energy needed to “fix” carbon dioxide, turning it into organic compounds. The most abundant microbe is an archaea that lives in the water (rather than mud) and oxidizes ammonium. When the archaea die, they become food for another group that oxidizes sulfur for energy, Christner said. The second most common group of microbes oxidizes iron. Yet another group of bacteria chomps on methane.”
Read the full article on Yahoo! News
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