Journal
FEMS MICROBIOLOGY ECOLOGY
Volume 96, Issue 5, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/femsec/fiaa036
Keywords
Gallionellaceae; metagenome-assembled genomes; niche partitioning; redox interface; hard-rock aquifers; groundwater flows
Categories
Funding
- EC2CO initiative of the French National Center for Scientific Research (CNRS)
- The French National Research Agency (ANR) project: Stock-en-Socle [ANR-13-SEED-0009]
- The French National Research Agency (ANR) project: CRITEX [ANR-11-EQPX-0011]
- The French National Research Agency (ANR) project: Subsurface mixing and reactions [ANR-14-CE04-0003]
- Region Bretagne
- European Research Council (ERC) project Reactive-Fronts [648377]
- European Research Council (ERC) [648377] Funding Source: European Research Council (ERC)
- Agence Nationale de la Recherche (ANR) [ANR-14-CE04-0003, ANR-13-SEED-0009] Funding Source: Agence Nationale de la Recherche (ANR)
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Fe-oxidizing bacteria of the family Gallionellaceae are major players in the Fe biogeochemical cycle in freshwater. These bacteria thrive in redox transition zones where they benefit from both high Fe concentrations and microaerobic conditions. We analysed the Gallionellaceae genomic diversity in an artesian hard-rock aquifer where redox transition zones develop (i) in the subsurface, where ancient, reduced groundwater mixes with recent oxygenated groundwater, and (ii) at the surface, where groundwater reaches the open air. A total of 15 new draft genomes of Gallionellaceae representing to 11 candidate genera were recovered from the two redox transition zones. Sulfur oxidation genes were encoded in most genomes while denitrification genes were much less represented. One genus dominated microbial communities belowground and we propose to name it 'Candidatus Houarnoksidobacter'. The two transition zones were populated by completely different assemblages of Gallionellaceae despite the almost constant upward circulation of groundwater between the two zones. The processes leading to redox transition zones, oxygen diffusion at the surface or groundwater mixing in subsurface, appear to be a major driver of the Gallionellaceae diversity.
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