干旱区生态环境知识资源中心(Arid): Antarctic Water Tracks: Microbial Community Responses to Variation in Soil Moisture, pH, and Salinity

Arid

DOI	10.3389/fmicb.2021.616730
	Antarctic Water Tracks: Microbial Community Responses to Variation in Soil Moisture, pH, and Salinity
	George, Scott F.; Fierer, Noah; Levy, Joseph S.; Adams, Byron
通讯作者	George, SF (corresponding author), Brigham Young Univ, Dept Biol, Provo, UT 84602 USA.
来源期刊	FRONTIERS IN MICROBIOLOGY
ISSN	1664-302X
出版年	2021
卷号	12
英文摘要	Ice-free soils in the McMurdo Dry Valleys select for taxa able to cope with challenging environmental conditions, including extreme chemical water activity gradients, freeze-thaw cycling, desiccation, and solar radiation regimes. The low biotic complexity of Dry Valley soils makes them well suited to investigate environmental and spatial influences on bacterial community structure. Water tracks are annually wetted habitats in the cold-arid soils of Antarctica that form briefly each summer with moisture sourced from snow melt, ground ice thaw, and atmospheric deposition via deliquescence and vapor flow into brines. Compared to neighboring arid soils, water tracks are highly saline and relatively moist habitats. They represent a considerable area (similar to 5-10 km(2)) of the Dry Valley terrestrial ecosystem, an area that is expected to increase with ongoing climate change. The goal of this study was to determine how variation in the environmental conditions of water tracks influences the composition and diversity of microbial communities. We found significant differences in microbial community composition between on- and off-water track samples, and across two distinct locations. Of the tested environmental variables, soil salinity was the best predictor of community composition, with members of the Bacteroidetes phylum being relatively more abundant at higher salinities and the Actinobacteria phylum showing the opposite pattern. There was also a significant, inverse relationship between salinity and bacterial diversity. Our results suggest water track formation significantly alters dry soil microbial communities, likely influencing subsequent ecosystem functioning. We highlight how Dry Valley water tracks could be a useful model system for understanding the potential habitability of transiently wetted environments found on the surface of Mars.
英文关键词	Antarctica Mars analog water tracks microbial ecology extremophiles
类型	Article
语种	英语
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000616514400001
WOS类目	Microbiology
WOS研究方向	Microbiology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/347909
作者单位	[George, Scott F.; Adams, Byron] Brigham Young Univ, Dept Biol, Provo, UT 84602 USA; [Fierer, Noah] Univ Colorado, Dept Ecol & Evolutionary Biol, Boulder, CO 80309 USA; [Fierer, Noah] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA; [Levy, Joseph S.] Colgate Univ, Dept Geol, Hamilton, NY 13346 USA; [Adams, Byron] Brigham Young Univ, Monte L Bean Museum, Provo, UT 84602 USA
推荐引用方式 GB/T 7714	George, Scott F.,Fierer, Noah,Levy, Joseph S.,et al. Antarctic Water Tracks: Microbial Community Responses to Variation in Soil Moisture, pH, and Salinity[J],2021,12.
APA	George, Scott F.,Fierer, Noah,Levy, Joseph S.,&Adams, Byron.(2021).Antarctic Water Tracks: Microbial Community Responses to Variation in Soil Moisture, pH, and Salinity.FRONTIERS IN MICROBIOLOGY,12.
MLA	George, Scott F.,et al."Antarctic Water Tracks: Microbial Community Responses to Variation in Soil Moisture, pH, and Salinity".FRONTIERS IN MICROBIOLOGY 12(2021).