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globalchange > 过去全球变化的重建

DOI:	10.1371/journal.pone.0150342
论文题名:	An Unusual Inverted Saline Microbial Mat Community in an Interdune Sabkha in the Rub' al Khali (the Empty Quarter), United Arab Emirates
作者:	Christopher P. McKay; Jon C. Rask; Angela M. Detweiler; Brad M. Bebout; R. Craig Everroad; Jackson Z. Lee; Jeffrey P. Chanton; Marisa H. Mayer; Adrian A. L. Caraballo; Bennett Kapili; Meshgan Al-Awar; Asma Al-Farraj
刊名:	PLOS ONE
ISSN:	1932-6203
出版年:	2016
发表日期:	2016-3-16
卷:	11, 期:3
语种:	英语
英文关键词:	Methane ; Salinity ; Sediment ; Polymerase chain reaction ; Sequence databases ; Oxygen ; Ribosomal RNA ; Deserts
英文摘要:	Salt flats (sabkha) are a recognized habitat for microbial life in desert environments and as analogs of habitats for possible life on Mars. Here we report on the physical setting and microbiology of interdune sabkhas among the large dunes in the Rub' al Khali (the Empty Quarter) in Liwa Oasis, United Arab Emirates. The salt flats, composed of gypsum and halite, are moistened by relatively fresh ground water. The result is a salinity gradient that is inverted compared to most salt flat communities with the hypersaline layer at the top and freshwater layers below. We describe and characterize a rich photosynthetically-based microbial ecosystem that is protected from the arid outside environment by a translucent salt crust. Gases collected from sediments under shallow ponds in the sabkha contain methane in concentrations as high as 3400 ppm. The salt crust could preserve biomarkers and other evidence for life in the salt after it dries out. Chloride-filled depressions have been identified on Mars and although surface flow of water is unlikely on Mars today, ground water is possible. Such a near surface system with modern groundwater flowing under ancient salt deposits could be present on Mars and could be accessed by surface rovers.
URL:	http://journals.plos.org/plosone/article/file?id=10.1371/journal.pone.0150342&type=printable
Citation statistics:
资源类型:	期刊论文
标识符:	http://119.78.100.158/handle/2HF3EXSE/23336
Appears in Collections:	过去全球变化的重建影响、适应和脆弱性科学计划与规划气候变化与战略全球变化的国际研究计划气候减缓与适应气候变化事实与影响

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File Name/ File Size	Content Type	Version	Access	License
journal.pone.0150342.PDF（1783KB）	期刊论文	作者接受稿	开放获取	CC BY-NC-SA	View Download

作者单位:

NASA Ames Research Center, Moffett Field, California, United States of America;NASA Ames Research Center, Moffett Field, California, United States of America;NASA Ames Research Center, Moffett Field, California, United States of America;Bay Area Environmental Research Institute, Petaluma, California, United States of America;NASA Ames Research Center, Moffett Field, California, United States of America;NASA Ames Research Center, Moffett Field, California, United States of America;Bay Area Environmental Research Institute, Petaluma, California, United States of America;NASA Ames Research Center, Moffett Field, California, United States of America;Bay Area Environmental Research Institute, Petaluma, California, United States of America;Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, Florida, United States of America;NASA Ames Research Center, Moffett Field, California, United States of America;NASA Ames Research Center, Moffett Field, California, United States of America;NASA Ames Research Center, Moffett Field, California, United States of America;Research and Studies Center, Dubai Police Academy, Dubai, United Arab Emirates;Geography Department, United Arab Emirates University, Al Ain, United Arab Emirates

Recommended Citation:

Christopher P. McKay,Jon C. Rask,Angela M. Detweiler,et al. An Unusual Inverted Saline Microbial Mat Community in an Interdune Sabkha in the Rub' al Khali (the Empty Quarter), United Arab Emirates[J]. PLOS ONE,2016-01-01,11(3)

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