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Title

The deep continental subsurface: the dark biosphere

AuthorsEscudero, Cristina; Oggerin, Monike ; Amils, Ricardo
KeywordsFluorescence in situ hybridization
SLiME
Deep subsurface drilling
Dark biosphere
Geomicrobiology
Issue Date30-May-2018
PublisherSociedad Española de Microbiología
CitationInternational Microbiology 21: 3- 14 (2018)
AbstractAlthough information from devoted geomicrobiological drilling studies is limited, it is clear that the results obtained so far call for a systematic exploration of the deep continental subsurface, similar to what has been accomplished in recent years by the Ocean Drilling Initiatives. In addition to devoted drillings from the surface, much of the continental subsurface data has been obtained using different subterranean “windows,” each with their correspondent limitations. In general, the number and diversity of microorganisms decrease with depth, and the abundance of Bacteria is superior to Archaea. Within Bacteria, the most commonly detected phyla correspond to Proteobacteria, Actinobacteria, Bacteroidetes, and Firmicutes. Within Archaea, methanogens are recurrently detected in most analyzed subsurface samples. One of the most controversial topics in the study of subsurface environments is whether the available energy source is endogenous or partly dependent on products photosynthetically generated in the subsurface. More information, at better depth resolution, is needed to build up the catalog of deep subsurface microbiota and the biologically available electron acceptors and donors.
URIhttp://hdl.handle.net/10261/182018
Identifiersdoi: 10.1007/s10123-018-0009-y
issn: 1618-1905
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