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学科主题: 地球科学::地质学
题名: Microbial Habitability and Pleistocene Aridification of the Asian Interior
作者: Wang, JY (Wang, Jiuyi)1, 2, 3; Lowenstein, TK (Lowenstein, Tim K.)3; Fang, XM (Fang, Xiaomin)1, 2
通讯作者: Lowenstein, TK
刊名: ASTROBIOLOGY
发表日期: 2016
DOI: 10.1089/ast.2015.1397
卷: 16, 期:6, 页:379-388
收录类别: SCI
合作性质: 国际
文章类型: Article
英文摘要: Fluid inclusions trapped in ancient halite can contain a community of halophilic prokaryotes and eukaryotes that inhabited the surface brines from which the halite formed. Long-term survival of bacteria and archaea and preservation of DNA have been reported from halite, but little is known about the distribution of microbes in buried evaporites. Here we report the discovery of prokaryotes and single-celled algae in fluid inclusions in Pleistocene halite, up to 2.26 Ma in age, from the Qaidam Basin, China. We show that water activity (alpha(w)), a measure of water availability and an environmental control on biological habitability in surface brines, is also related to microbe entrapment in fluid inclusions. The alpha(w) of Qaidam Basin brines progressively decreased over the last similar to 1 million years, driven by aridification of the Asian interior, which led to decreased precipitation and water inflow and heightened evaporation rates. These changes in water balance produced highly concentrated brines, which reduced the habitability of surface lakes and decreased the number of microbes trapped in halite. By 0.13 Ma, the alpha(w) of surface brines approached the limits tolerated by halophilic prokaryotes and algae. These results show the response of microbial ecosystems to climate change in an extreme environment, which will guide future studies exploring deep life on Earth and elsewhere in the Solar System.
语种: 英语
WOS记录号: WOS:000377210200001
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/7689
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Tibetan Plateau Res, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China
3.SUNY Binghamton, Dept Geol Sci & Environm Studies, Binghamton, NY 13902 USA

Recommended Citation:
Wang, JY ,Lowenstein, TK ,Fang, XM . Microbial Habitability and Pleistocene Aridification of the Asian Interior[J]. ASTROBIOLOGY,2016,16(6):379-388.
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