气候变化领域集成服务门户(CCPortal): Lithogenic hydrogen supports microbial primary production in subglacial and proglacial environments

CCPortal

DOI	10.1073/PNAS.2007051117
	Lithogenic hydrogen supports microbial primary production in subglacial and proglacial environments
	Dunhama E.C.; Doreb J.E.; Skidmorec M.L.; Rodend E.E.; Boyda E.S.
发表日期	2021
ISSN	00278424
卷号	118 期号:2
英文摘要	Life in environments devoid of photosynthesis, such as on early Earth or in contemporary dark subsurface ecosystems, is supported by chemical energy. How, when, and where chemical nutrients released from the geosphere fuel chemosynthetic biospheres is fundamental to understanding the distribution and diversity of life, both today and in the geologic past. Hydrogen (H2) is a potent reductant that can be generated when water interacts with reactive components of mineral surfaces such as silicate radicals and ferrous iron. Such reactive mineral surfaces are continually generated by physical comminution of bedrock by glaciers. Here, we show that dissolved H2concentrations in meltwaters from an iron and silicate mineral-rich basaltic glacial catchment were an order of magnitude higher than those from a carbonate-dominated catchment. Consistent with higher H2abundance, sediment microbial communities from the basaltic catchment exhibited significantly shorter lag times and faster rates of net H2oxidation and dark carbon dioxide (CO2) fixation than those from the carbonate catchment, indicating adaptation to use H2as a reductant in basaltic catchments. An enrichment culture of basaltic sediments provided with H2, CO2, and ferric iron produced a chemolithoautotrophic population related to Rhodoferax ferrireducens with a metabolism previously thought to be restricted to (hyper) thermophiles and acidophiles. These findings point to the importance of physical and chemical weathering processes in generating nutrients that support chemosynthetic primary production. Furthermore, they show that differences in bedrock mineral composition can influence the supplies of nutrients like H2and, in turn, the diversity, abundance, and activity of microbial inhabitants. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Basalt; Carbonate; Chemoautotrophy; Hydrogen; Iron reduction
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/181027
作者单位	Department of Microbiology and Immunology, Montana State University, Bozeman, MT 59717, United States; Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT 59717, United States; Department of Earth Sciences, Montana State University, Bozeman, MT 59717, United States; Department of Geoscience, University of Wisconsin-Madison, Madison, WI 53706, United States
推荐引用方式 GB/T 7714	Dunhama E.C.,Doreb J.E.,Skidmorec M.L.,et al. Lithogenic hydrogen supports microbial primary production in subglacial and proglacial environments[J],2021,118(2).
APA	Dunhama E.C.,Doreb J.E.,Skidmorec M.L.,Rodend E.E.,&Boyda E.S..(2021).Lithogenic hydrogen supports microbial primary production in subglacial and proglacial environments.Proceedings of the National Academy of Sciences of the United States of America,118(2).
MLA	Dunhama E.C.,et al."Lithogenic hydrogen supports microbial primary production in subglacial and proglacial environments".Proceedings of the National Academy of Sciences of the United States of America 118.2(2021).