Abstract：
:Present-day terrestrial analogue sites are crucial ground truth proxies for studying life in geochemical conditions close to those assumed to be present on early Earth or inferred to exist on other celestial bodies (e.g. Mars, Europa). Although hypersaline sapropels are border-of-life habitats with moderate occurrence, their microbiological and physicochemical characterization lags behind. Here, we study the diversity of life under low water activity by describing the prokaryotic communities from two disparate hypersaline sapropels (Transylvanian Basin, Romania) in relation to geochemical milieu and pore water chemistry, while inferring their role in carbon cycling by matching taxa to known taxon-specific biogeochemical functions. The polyphasic approach combined deep coverage SSU rRNA gene amplicon sequencing and bioinformatics with RT-qPCR and physicochemical investigations. We found that sapropels developed an analogous elemental milieu and harbored prokaryotes affiliated with fifty-nine phyla, among which the most abundant were Proteobacteria, Bacteroidetes and Chloroflexi. Containing thirty-two candidate divisions and possibly undocumented prokaryotic lineages, the hypersaline sapropels were found to accommodate one of the most diverse and novel ecosystems reported to date and may contribute to completing the phylogenetic branching of the tree of life.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Andrei AŞ,Baricz A,Robeson MS 2nd,Păuşan MR,Tămaş T,Chiriac C,Szekeres E,Barbu-Tudoran L,Levei EA,Coman C,Podar M,Banciu HLdoi
10.1038/s41598-017-06232-wsubject
Has Abstractpub_date
2017-07-21 00:00:00pages
6150issue
1issn
2045-2322pii
10.1038/s41598-017-06232-wjournal_volume
7pub_type
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