干旱区生态环境知识资源中心(Arid): Microbial Activity and Habitability of an Antarctic Dry Valley Water Track

Arid

DOI	10.1089/ast.2018.1884
	Microbial Activity and Habitability of an Antarctic Dry Valley Water Track
	Chan-Yam, Kelly 1; Goordial, Jacqueline 1,2; Greer, Charles 3; Davila, Alfonso 4; McKay, Christopher P.4; Whyte, Lyle G.1
通讯作者	Whyte, Lyle G.
来源期刊	ASTROBIOLOGY
ISSN	1531-1074
EISSN	1557-8070
出版年	2019
卷号	19 期号:6 页码:757-770
英文摘要	Water tracks in the Antarctic Dry Valleys are dark linear features of increased soil moisture that flow downslope over the spring and summer, providing a source of moisture in a cold-arid desert. They are typically sourced from melting snow, ground ice, and deliquescence (Levy et al., 2011). This research presents the first in-depth study of the activity potential and diversity of microbial communities of Antarctic water tracks. We investigated whether these water track soils are more habitable to microbial communities by ascertaining the differences in diversity, total and culturable cell counts, and microbial respiratory activity in water track soils compared with the adjacent dry soils in Pearse Valley. Total cell counts ranged from 1.47 x 10(3) to 4.17 x 10(5) cells/g dry weight soil. Water track soils had higher total and culturable biomass, in addition to higher microbial activity at 5 degrees and -5 degrees C, compared with adjacent dry soils. Microbial respiration was positively correlated with soil moisture content, but total cell counts and plate counts were not. Surprisingly, microbial community composition did not differ between wet and dry soil communities, and was not related to soil moisture content. The microbial community composition instead appeared to differ spatially based on location and depth. Overall, the data suggest that cold water tracks are more habitable than the surrounding cold-arid soils. Our results suggest that recurring slope lineae, which are dark linear features that grow downslope on Mars over the spring and summer, where liquid water might be a recurring phenomenon, could be sites of astrobiological potential.
英文关键词	Water tracks Recurring slope lineae McMurdo Dry Valleys Mars analog environment Astrobiology 19 xxx-xxx
类型	Article
语种	英语
国家	Canada ; USA
收录类别	SCI-E
WOS记录号	WOS:000463769700001
WOS关键词	TAYLOR VALLEY ; PERMAFROST ; DIVERSITY ; BACTERIAL ; COMMUNITIES ; POPULATIONS ; ECOLOGY ; DESERT ; FLOWS ; SOILS
WOS类目	Astronomy & Astrophysics ; Biology ; Geosciences, Multidisciplinary
WOS研究方向	Astronomy & Astrophysics ; Life Sciences & Biomedicine - Other Topics ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214419
作者单位	1.McGill Univ, Dept Nat Resource Sci, Montreal, PQ, Canada; 2.Bigelow Lab Ocean Sci, Harbor, ME USA; 3.Natl Res Council Canada, Montreal, PQ, Canada; 4.NASA, Ames Res Ctr, Moffett Field, CA 94035 USA
推荐引用方式 GB/T 7714	Chan-Yam, Kelly,Goordial, Jacqueline,Greer, Charles,et al. Microbial Activity and Habitability of an Antarctic Dry Valley Water Track[J],2019,19(6):757-770.
APA	Chan-Yam, Kelly,Goordial, Jacqueline,Greer, Charles,Davila, Alfonso,McKay, Christopher P.,&Whyte, Lyle G..(2019).Microbial Activity and Habitability of an Antarctic Dry Valley Water Track.ASTROBIOLOGY,19(6),757-770.
MLA	Chan-Yam, Kelly,et al."Microbial Activity and Habitability of an Antarctic Dry Valley Water Track".ASTROBIOLOGY 19.6(2019):757-770.