气候变化领域集成服务门户(CCPortal): Microbial Habitability and Pleistocene Aridification of the Asian Interior

CCPortal

DOI	10.1089/ast.2015.1397
	Microbial Habitability and Pleistocene Aridification of the Asian Interior
	Wang, Jiuyi; Lowenstein, Tim K.; Fang, Xiaomin
通讯作者	Lowenstein, TK (通讯作者)
发表日期	2016
ISSN	1531-1074
EISSN	1557-8070
起始页码	379
结束页码	388
卷号	16 期号:6
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.
关键词	WESTERN QAIDAM BASIN LONG-TERM SURVIVAL DRILL CORE SG-1 DEATH-VALLEY FLUID INCLUSIONS TIBETAN PLATEAU ANCIENT HALITE WATER-ACTIVITY SALINE VALLEY SALT LAKES
英文关键词	Halite fluid inclusions; Ancient microbes; Water activity; Qaidam Basin; Pleistocene aridification
语种	英语
WOS研究方向	Astronomy & Astrophysics ; Life Sciences & Biomedicine - Other Topics ; Geology
WOS类目	Astronomy & Astrophysics ; Biology ; Geosciences, Multidisciplinary
WOS记录号	WOS:000377210200001
来源期刊	ASTROBIOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258662
推荐引用方式 GB/T 7714	Wang, Jiuyi,Lowenstein, Tim K.,Fang, Xiaomin. Microbial Habitability and Pleistocene Aridification of the Asian Interior[J]. 中国科学院青藏高原研究所,2016,16(6).
APA	Wang, Jiuyi,Lowenstein, Tim K.,&Fang, Xiaomin.(2016).Microbial Habitability and Pleistocene Aridification of the Asian Interior.ASTROBIOLOGY,16(6).
MLA	Wang, Jiuyi,et al."Microbial Habitability and Pleistocene Aridification of the Asian Interior".ASTROBIOLOGY 16.6(2016).