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  Prokaryotic diversity and biogeochemical characteristics of benthic microbial ecosystems from James Ross Archipelago (West Antarctica)

Fernández, G. C., Lecomte, K., Vignoni, P. A., Rueda, E. S., Coria, S. H., Lirio, J. M., Mlewski, E. C. (2022): Prokaryotic diversity and biogeochemical characteristics of benthic microbial ecosystems from James Ross Archipelago (West Antarctica). - Polar Biology, 45, 405-418.
https://doi.org/10.1007/s00300-021-02997-z

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 Creators:
Fernández, Guillermo Cesar1, Author
Lecomte, Karina1, Author
Vignoni, Paula Andrea2, Author              
Rueda, Eliana Soto1, Author
Coria, Silvia H.1, Author
Lirio, Juan M.1, Author
Mlewski, Estela Cecilia1, Author
Affiliations:
1External Organizations, ou_persistent22              
24.3 Climate Dynamics and Landscape Evolution, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146046              

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Free keywords: Antarctica · Microbial mats · Microbial diversity · 16S rRNA genes · James Ross Archipelago
 Abstract: The James Ross archipelago houses numerous lakes and ponds. In this region, a vast diatom and cyanobacterial variety has been reported; however, the prokaryotic diversity in microbial mats from these lakes remains poorly explored. Here, a high- throughput sequencing of 16S rRNA gene in microbial mats from Lake Bart-Roja in James Ross Island and lakes Pan Negro and North Pan Negro located in Vega Island was performed. Combined with mineralogical and environmental characteristics, we analyzed the diversity and structure of the microbial communities. Sequences assigned to Archaea were extremely low, while Bacteria domain prevailed with the abundance of Proteobacteria (mostly Betaproteobacteriales) followed by Bacte- roidetes, Verrucomicrobia, Firmicutes, and Cyanobacteria. Local environmental conditions, such as conductivity and Eh, provided differential microbial assemblages that might have implications in the oligotrophic status of the lakes. Consequently, a clear segregation at the family level was observed. In this sense, the assigned diversity was related to taxa recognized as denitrifiers and sulfur oxidizers. Particularly, in Lake Pan Negro sulfur-reducing and methanogenic representatives were also found and positively correlate with alkalinity and water depth. Moreover, Deinococcus-Thermus was observed in Lake Bart-Roja, while Melainabacteria (Cyanobacteria)—poorly reported in Antarctic mats—was detected in Lake Pan Negro. Epsilonbacteraeota was exclusively found in this lake, suggesting new potential phylotypes. This study contributes to the understanding of the diversity, composition, and structure of Antarctic benthic microbial ecosystems and provides highly valuable information, which can be used as a proxy to evaluate environmental changes affecting Antarctic microbiota.

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 Dates: 2022-01-282022
 Publication Status: Finally published
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1007/s00300-021-02997-z
GFZPOF: p4 T5 Future Landscapes
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Title: Polar Biology
Source Genre: Journal, SCI, Scopus
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Pages: - Volume / Issue: 45 Sequence Number: - Start / End Page: 405 - 418 Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals405
Publisher: Springer Nature