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ISME J. 2014 Jan;8(1):126-38. doi: 10.1038/ismej.2013.125. Epub 2013 Aug 15.

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

Author information

1
VTT Technical Research Centre of Finland, Espoo, Finland.
2
Institute of Biotechnology, University of Helsinki, Helsinki, Finland.
3
Geological Survey of Finland, Espoo, Finland.

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.

PMID:
23949662
PMCID:
PMC3869007
DOI:
10.1038/ismej.2013.125
[Indexed for MEDLINE]
Free PMC Article
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