Researchers Find Glass-Eating Microbes at the Rock Bottom on Food Chain
Welcome to the bottom of the deep-sea food chain. The rock bottom, that is.
In the current edition of Geochemistry, Geophysics, Geosystems, a team of researchers uncovers and characterizes a process that is commonplace below the ocean bottom.
In the upper 300 meters of the earth's oceanic crust, microbes were found to have literally eaten their way through rock.
Traces of this process are preserved in the glassy margins of underwater lava flows (scientists call super-cooled lava spewed by undersea volcanoes "glass," which is similar to material used to make stone-age axes and knives).
Glass samples were recovered by drilling as deep as four miles below sea level. "We've documented how extensive these microscopic organisms are eating into volcanic rock, leaving worm-like tracks that look like someone has drilled their way in," said one of the paper's co-authors, Hubert Staudigel of Scripps Institution of Oceanography at the University of California, San Diego.
"Our study has confirmed that there's no place in the oceans that doesn't have these features." The process of volcanic rock changing from one state to another has traditionally been seen as a purely chemical-physical process, rather than biological.
These rock alterations lead to chemical interactions between the oceanic crust and seawater, influencing important chemical cycles on the earth, including the carbon cycle that is important to the earth's climate.
Staudigel says the microbes may tunnel their way into rock to derive chemical energy from the glass and to find protection from larger grazing organisms. He calls the glass-eating microbes the rock bottom of the food chain. "We've basically determined the depth of the biosphere," said Staudigel.
The study is featured as an "Editor's Choice" selection in the September 28, 2001 edition of the journal Science. Co-authors include Harald Furnes, Ingunn H. Thorseth, Terje Torsvik, and Ole Tumyr of Bergen University in Norway, and Karlis Muehlenbachs of the University of Alberta in Edmonton.
Scripps Institution of Oceanography
Geochemistry, Geophysics, Geosystems
Subscribe To SpaceDaily Express
Scientists Toast the Discovery of Vinyl Alcohol in Interstellar Space
Kitt Peak - October 1, 2001
Astronomers using the National Science Foundation's 12 Meter Telescope at Kitt Peak, AZ, have discovered the complex organic molecule vinyl alcohol in an interstellar cloud of dust and gas near the center of the Milky Way Galaxy. The discovery of this long-sought compound could reveal tantalizing clues to the mysterious origin of complex organic molecules in space.
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2016 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.