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Sulphate-controlled Diversity of Subterranean Microbial Communities over Depth in Deep Groundwater with Opposing Gradients of Sulphate and Methane

Karsten Pedersen (Institutionen för bygg- och miljöteknik, Geologi och geoteknik) ; A. F. Bengtsson ; J. S. Edlund ; L. C. Eriksson
Geomicrobiology Journal (0149-0451). Vol. 31 (2014), 7, p. 617-631.
[Artikel, refereegranskad vetenskaplig]

The groundwater system in Olkiluoto, Finland, is stratified with a mixing layer at a depth of approximately 300m between sulphate-rich, methane-poor and sulphate-poor, methane-rich groundwaters. New sequence library data obtained by 454 pyrotag sequencing of the v4v6 16S rDNA region indicated that sulphate-reducing bacteria (SRB) dominated the mixing layer while SRB could not be detected in the deep sulphate-poor groundwater samples. With the indispensable support of the sequence data, it could be demonstrated that sulphate was the only component needed to trigger a very large community transition in deep sulphate-poor, methane-rich groundwater from a non-sulphate-reducing community comprising Hydrogenophaga, Pseudomonas, Thiobacillus, Fusibacter, and Lutibacter to a sulphate-reducing community with Desulfobacula, Desulfovibrio, Desufobulbaceae, Desulfobacterium, Desulfosporosinus, and Desulfotignum. Experiments with biofilms and planktonic microorganisms in flow cells under in situ conditions confirmed that adding sulphate to the sulphate-poor groundwater generated growth of cultivable SRB and detectable SRB-related sequences. It was also found that the 16S rDNA diversity of the biofilms was conserved over 103 d and that there was great similarity in diversity between the microorganisms in the biofilms and in the flowing groundwater. This work demonstrates that the presence/absence of only one geochemical parameter, i.e., sulphate, in the groundwater significantly influenced the diversity of the investigated subterranean microbial community.

Nyckelord: ATP, biofilm, cultivation, deep biosphere, 16S rDNA, introduced organic-compounds, granitic groundwater, bacterial, communities, fennoscandian shield, crystalline bedrock, southeastern, sweden, reducing bacterium, gen. nov., rock, populations

Denna post skapades 2014-10-06. Senast ändrad 2014-11-27.
CPL Pubid: 203718


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Institutioner (Chalmers)

Institutionen för bygg- och miljöteknik, Geologi och geoteknik


Geovetenskap och miljövetenskap

Chalmers infrastruktur