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Microbial Communities Inhabiting a Rare Earth Element Enriched Birnessite-Type Manganese Deposit in the Ytterby Mine, Sweden
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences. Swedish Museum of Natural History, Sweden.
Stockholm University, Faculty of Science, Department of Geological Sciences.
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Number of Authors: 52018 (English)In: Geomicrobiology Journal, ISSN 0149-0451, E-ISSN 1521-0529, Vol. 35, no 8, p. 657-674Article in journal (Refereed) Published
Abstract [en]

The dominant initial phase formed during microbially mediated manganese oxidation is a poorly crystalline birnessite-type phyllomanganate. The occurrence of manganese deposits containing this mineral is of interest for increased understanding of microbial involvement in the manganese cycle. A culture independent molecular approach is used as a first step to investigate the role of microorganisms in forming rare earth element enriched birnessite-type manganese oxides, associated with water bearing rock fractures in a tunnel of the Ytterby mine, Sweden. 16S rRNA gene results show that the chemotrophic bacterial communities are diverse and include a high percentage of uncultured unclassified bacteria while archaeal diversity is low with Thaumarchaeota almost exclusively dominating the population. Ytterby clones are frequently most similar to clones isolated from subsurface environments, low temperature milieus and/or settings rich in metals. Overall, bacteria are dominant compared to archaea. Both bacterial and archaeal abundances are up to four orders of magnitude higher in manganese samples than in fracture water. Potential players in the manganese cycling are mainly found within the ferromanganese genera Hyphomicrobium and Pedomicrobium, and a group of Bacteroidetes sequences that cluster within an uncultured novel genus most closely related to the Terrimonas. This study strongly suggest that the production of the YBS deposit is microbially mediated.

Place, publisher, year, edition, pages
2018. Vol. 35, no 8, p. 657-674
Keywords [en]
Birnessite, microbial diversity, manganese oxidizing bacteria, organomineralization, subsurface microbiology
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-158204DOI: 10.1080/01490451.2018.1444690ISI: 000437337500003OAI: oai:DiVA.org:su-158204DiVA, id: diva2:1235423
Available from: 2018-07-25 Created: 2018-07-25 Last updated: 2018-07-25Bibliographically approved

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Sjöberg, SusanneCallac, NolwennSmittenberg, Rienk H.Dupraz, Christophe
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