Geologic Publications for Mount Rainier

Summer dynamics of microbial diversity on a mountain glacier

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Author(s): Scott Hotaling, Taylor L. Price, Trinity L. Hamilton

Category: PUBLICATION
Document Type:
Publisher: ASM Journals: mSphere
Published Year: 2022
Volume: 7
Number: 6
Pages: 6
DOI Identifier: 10.1128/msphere.00503-22
ISBN Identifier:
Keywords: alpine glacier snow algae glacier biology cryosphere biological albedo reduction alpine

Abstract:
Glaciers are rapidly receding under climate change. A melting cryosphere will dramatically alter global sea levels, carbon cycling, and water resource availability. Glaciers host rich biotic communities that are dominated by microbial diversity, and this biodiversity can impact surface albedo, thereby driving a feedback loop between biodiversity and cryosphere melt. However, the microbial diversity of glacier ecosystems remains largely unknown outside of major ice sheets, particularly from a temporal perspective. Here, we characterized temporal dynamics of bacteria, eukaryotes, and algae on the Paradise Glacier, Mount Rainier, USA, over nine time points spanning the summer melt season. During our study, the glacier surface steadily darkened as seasonal snow melted and darkening agents accumulated until new snow fell in late September. From a community-wide perspective, the bacterial community remained generally constant while eukaryotes and algae exhibited temporal progression and community turnover. Patterns of individual taxonomic groups, however, were highly stochastic. We found little support for our a priori prediction that autotroph abundance would peak before heterotrophs. Notably, two different trends in snow algae emerged—an abundant early- and late-season operational taxonomic unit (OTU) with a different midsummer OTU that peaked in August. Overall, our results highlight the need for temporal sampling to clarify microbial diversity on glaciers and that caution should be exercised when interpreting results from single or few time points.

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Suggested Citations:
In Text Citation:
Hotaling and others (2022) or (Hotaling et al., 2022)

References Citation:
Hotaling, S., T.L. Price, and T.L. Hamilton, 2022, Summer dynamics of microbial diversity on a mountain glacier: ASM Journals: mSphere, Vol. 7, No. 6, 6 p., doi: 10.1128/msphere.00503-22.