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Reconstruction of the functional ecosystem in the high light, low temperature Union Glacier Region, Antarctica

Citation

Li, Y and Cha, Q-Q and Dang, Y-R and Chen, X-L and Wang, M and McMinn, A and Espina, G and Zhang, Y-Z and Blamey, JM and Qin, Q-L, Reconstruction of the functional ecosystem in the high light, low temperature Union Glacier Region, Antarctica, Frontiers in Microbiology, 10, (OCT) Article 2408. ISSN 1664-302X (2019) [Refereed Article]


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Copyright Statement

Copyright 2019 Li, Cha, Dang, Chen, Wang, McMinn, Espina, Zhang, Blamey and Qin. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3389/fmicb.2019.02408

Abstract

Antarctica is covered by multiple larger glaciers with diverse extreme conditions. Microorganisms in Antarctic regions are primarily responsible for diverse biogeochemical processes. The identity and functionality of microorganisms from polar glaciers are defined. However, little is known about microbial communities from the high elevation glaciers. The Union Glacier, located in the inland of West Antarctica at 79S, is a challenging environment for life to survive due to the high irradiance and low temperatures. Here, soil and rock samples were obtained from three high mountains (Rossman Cove, Charles Peak, and Elephant Head) adjacent to the Union Glacier. Using metagenomic analyses, the functional microbial ecosystem was analyzed through the reconstruction of carbon, nitrogen and sulfur metabolic pathways. A low biomass but diverse microbial community was found. Although archaea were detected, bacteria were dominant. Taxa responsible for carbon fixation were comprised of photoautotrophs (Cyanobacteria) and chemoautotrophs (mainly Alphaproteobacterial clades: Bradyrhizobium, Sphingopyxis, and Nitrobacter). The main nitrogen fixation taxa were Halothece (Cyanobacteria), Methyloversatilis, and Leptothrix (Betaproteobacteria). Diverse sulfide-oxidizing and sulfate-reducing bacteria, fermenters, denitrifying microbes, methanogens, and methane oxidizers were also found. Putative producers provide organic carbon and nitrogen for the growth of other heterotrophic microbes. In the biogeochemical pathways, assimilation and mineralization of organic compounds were the dominant processes. Besides, a range of metabolic pathways and genes related to high irradiance, low temperature and other stress adaptations were detected, which indicate that the microbial communities had adapted to and could survive in this harsh environment. These results provide a detailed perspective of the microbial functional ecology of the Union Glacier area and improve our understanding of linkages between microbial communities and biogeochemical cycling in high Antarctic ecosystems.

Item Details

Item Type:Refereed Article
Keywords:Antarctica, microorganism community, biogeochemical cycling, extreme environmental adaptation, metagenomic analysis, Antarctic glacier
Research Division:Biological Sciences
Research Group:Microbiology
Research Field:Microbial Ecology
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Antarctic and Sub-Antarctic Flora, Fauna and Biodiversity
UTAS Author:McMinn, A (Professor Andrew McMinn)
ID Code:135631
Year Published:2019
Deposited By:Ecology and Biodiversity
Deposited On:2019-11-06
Last Modified:2019-12-12
Downloads:2 View Download Statistics

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