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Activity and Diversity of Methane-oxidizing Bacteria in Glacier Forefields on Siliceous and Calcareous Bedrock : Volume 9, Issue 1 (30/01/2012)

By Nauer, P. A.

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Book Id: WPLBN0003973550
Format Type: PDF Article :
File Size: Pages 40
Reproduction Date: 2015

Title: Activity and Diversity of Methane-oxidizing Bacteria in Glacier Forefields on Siliceous and Calcareous Bedrock : Volume 9, Issue 1 (30/01/2012)  
Author: Nauer, P. A.
Volume: Vol. 9, Issue 1
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Liesack, W., Dam, B., Nauer, P. A., Schroth, M. H., & Zeyer, J. (2012). Activity and Diversity of Methane-oxidizing Bacteria in Glacier Forefields on Siliceous and Calcareous Bedrock : Volume 9, Issue 1 (30/01/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, 8092 Zurich, Switzerland. The global methane (CH4) cycle is largely driven by methanogenic archaea and methane-oxidizing bacteria (MOB), but little is known about their activity and diversity in pioneer ecosystems. We conducted a field survey in forefields of 13 receding Swiss glaciers on both siliceous and calcareous bedrock to investigate and quantify CH4 turnover based on soil-gas CH4 concentration profiles, and to characterize MOB communities using pmoA sequencing and T-RFLP. Methane turnover was fundamentally different in the two bedrock categories. Of the 36 CH4 concentration profiles from siliceous locations, 11 showed atmospheric CH4 consumption at concentrations of ∼1–2 μl l−1 with soil-atmosphere CH4 fluxes of −0.14 to −1.1 mg m−2 d−1. Another 11 profiles showed no apparent activity, while the remaining 14 exhibited slightly increased CH4 concentrations of ∼2–10 μl l−1, most likely due to microsite methanogenesis. In contrast, all profiles from calcareous sites suggested a substantial, yet unknown CH4 source below our sampling zone, with soil-gas CH4 concentrations reaching up to 1400 μl l−1. Remarkably, most soils oxidized ∼90% of the deep-soil CH4, resulting in soil-atmosphere fluxes of 0.12 to 31 mg m−2 d−1. MOB showed limited diversity in both siliceous and calcareous forefields: all identified pmoA sequences formed only 5 OTUs and, with one exception, could be assigned to either Methylocystis or the as-yet-uncultivated Upland Soil Cluster Γ (USCΓ). The latter dominated T-RFLP patterns of all siliceous and most calcareous samples, while Methylocystis dominated in 4 calcareous samples. As Type I MOB are widespread in cold climate habitats with elevated CH4 concentrations, USCΓ might be the corresponding Type I MOBs in habitats exposed to near-atmospheric CH4 concentrations.

Summary
Activity and diversity of methane-oxidizing bacteria in glacier forefields on siliceous and calcareous bedrock

Excerpt
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