Taxonomically and functionally diverse microbial communities in deep crystalline rocks of the Fennoscandian shield

Mari Nyyssönen (Corresponding Author), J. Hultman, L. Ahonen, I. Kukkonen, L. Paulin, P. Laine, Merja Itävaara, P. Auvinen

    Research output: Contribution to journalArticlepeer-review

    63 Citations (Scopus)

    Abstract

    Microbial life in the nutrient-limited and low-permeability continental crystalline crust is abundant but remains relatively unexplored. Using high-throughput sequencing to assess the 16S rRNA gene diversity, we found diverse bacterial and archaeal communities along a 2516-m-deep drill hole in continental crystalline crust in Outokumpu, Finland. These communities varied at different sampling depths in response to prevailing lithology and hydrogeochemistry. Further analysis by shotgun metagenomic sequencing revealed variable carbon and nutrient utilization strategies as well as specific functional and physiological adaptations uniquely associated with specific environmental conditions. Altogether, our results show that predominant geological and hydrogeochemical conditions, including the existence and connectivity of fracture systems and the low amounts of available energy, have a key role in controlling microbial ecology and evolution in the nutrient and energy-poor deep crustal biosphere.
    Original languageEnglish
    Pages (from-to)126-138
    Number of pages12
    JournalThe ISME Journal
    Volume8
    Issue number1
    DOIs
    Publication statusPublished - 2014
    MoE publication typeA1 Journal article-refereed

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