BATON ROUGE In a finding that has implications for life in other extreme environments, both on Earth and planets elsewhere in the solar system, LSU Associate Professor of Biological Sciences Brent Christner and fellow researchers funded by the National Science Foundation, or NSF, this week published a paper confirming that the waters and sediments of a lake that lies 800 meters (2600 feet) beneath the surface of the West Antarctic ice sheet support "viable microbial ecosystems."
Given that more than 400 subglacial lakes and numerous rivers and streams are thought to exist beneath the Antarctic ice sheet, such ecosystems may be widespread and may influence the chemical and biological composition of the Southern Ocean, the vast and biologically productive sea that encircles the continent.
According to Christner, the paper's lead author and a researcher with the NSF-funded Whillans Ice Stream Subglacial Access Research Drilling, or WISSARD, project, "hidden beneath a half-mile of ice in Antarctica is an unexplored part of our biosphere. WISSARD has provided a glimpse of the nature of microbial life that may lurk under more than five million square miles of ice sheet."
Analysis of the samples taken from subglacial Lake Whillans, the researchers indicate, show that the water contains a diverse microbial community, many members of which can mine rocks for energy and use carbon dioxide as their source of carbon.
Added John Priscu, a WISSARD scientist at Montana State University, Bozeman and a co-author on the paper, the Antarctic subglacial environment is the planet's largest wetland, one dominated completely by microorganisms.
The WISSARD findings were published Aug. 21 in the journal Nature by scientists and students affiliated with WISSARD, which is is a collaboration involving scientists at numerous institutions across the United States.
Co-author and NSF Graduate Research Fellow at LSU Amanda Achberger generated the key data for the paper. The Baton Rouge native and graduate of the LSU Laboratory School earned a bachelor's of science from LSU in 2010 and is currently pursuing a Ph.D. in biological sciences.
Other co-authors include students and researchers from LSU; the University of Venice in Italy; the Scripps Institution of Oceanography; St. Olaf College in Minnesota; the University of Tennessee; and Aberystwyth University in the United Kingdom.
NSF, which manages the U.S. Antarctic Program through its Division of Polar Programs, provided more than $10 million in grants as part of NSF's American Recovery and Reinvestment Act of 2009, or ARRA, portfolio to support the WISSARD science and development of related technologies.
NASA's Cryospheric Sciences Program, the National Oceanic and Atmospheric Administration, or NOAA, and the private Gordon and Betty Moore Foundation also provided support for the project.
The WISSARD team made scientific and engineering history in late January of 2013 when they used clean hot-water drilling technology to access subglacial Lake Whillans. This permitted the retrieval of pristine water and sediment samples that had been isolated from direct contact with the atmosphere for many thousands of years.
The interdisciplinary research team includes groups of experts in the following areas of science: life in icy environments, led by Priscu; glacial geology, led by Ross Powell, of Northern Illinois University; and glacial hydrology, led by Slawek Tulaczyk, of the University of California, Santa Cruz.
Definitive evidence of life in subglacial lakes
Definitive evidence of life in subglacial lakes
The realization that a vast aquatic system of rivers and lakes that exists beneath the ice in Antarctica has spurred investigations to examine the effect on ice-sheet stability and the habitability of environments at the bed. The latest WISSARD announcement is the first to provide definitive evidence that a functional microbial ecosystem exists beneath the Antarctic ice sheet, confirming more than a decade of speculation about life in this environment.
Using various methods, including airborne radar surveys, scientists have built a knowledge base about Antarctica's subglacial hydrological system over the past 40 years. The largest of the subglacial lakes, subglacial Lake Vostok in East Antarctica, is one of the largest lakes on our planet in terms of volume and depth and has been isolated beneath the ice sheet for more than 10 million years.
Samples of microbes from Lake Vostok have been collected indirectly by examining ice collected above the liquid part of the Lake- ice that refroze--accreted--on the bottom of the ice sheet.
These samples, which were described in 1999 by Priscu, the chief scientist of the WISSARD project, and David Karl, of the University of Hawaii, presented the first evidence for life beneath the huge Antarctic ice sheet.
However, the drilling techniques used to retrieve the Vostok samples and the low amount of microbial biomass present in the samples have called into question previous studies that concluded the lake supports a living ecosystem.
The WISSARD team drilled into subglacial Lake Whillans using a clean hot-water drill and incorporated rigorous measures to avoid the introduction of foreign material into the lake.
The approach to drilling was guided by recommendations in the 2007 National Research Council-sponsored report, "Exploration of Antarctic SubglacialAquatic Environments: Environmental and Scientific Stewardship," aimed to protect these unique environments from contamination.
A team of engineers and technicians directed by Frank Rack, of the University of Nebraska-Lincoln, designed and fabricated the specialized hot-water drill that was fitted with a filtration and germicidal UV system to prevent contamination of the subglacial environment and to recover clean samples for microbial analyses. In addition, the numerous customized scientific samplers and instruments used for this project were also carefully cleaned before being lowered into the borehole through the ice and into the lake.
A major concern that drove the clean-drilling techniques and protocols is that it is still unclear how interconnected the subglacial aquatic system is. Researchers did not want to risk contaminating the entire system through their sampling of one body of water.
The paper also raises a separate issue of the connectivity of Lake Whillians to the wider global ecosystem, noting that Lake Whillans is part of a network of three major reservoirs beneath the Whillans Ice Stream that regulate the transportation of water to a subglacial estuary--an area where fresh and salt water mix--which links the subglacial aquatic system to the ocean beneath the Ross Ice Shelf.
"Given the prevalence of subglacial water in Antarctica," the researchers write, "our data ... lead us to contend that aquatic microbial systems are common features of the subsurface environment that exists beneath the ... Antarctic Ice Sheet."
|Contact: Dawn Jenkins|
Louisiana State University