| description |
A total of 52,928 pyrosequencing reads were analyzed in order to reveal the bacterial community structures in stream and lake surface water samples from Fuglebekken and Revvatnet basins of the southern Svalbard. Depending on the sample examined, bacterial communities at higher taxonomic level consisted mainly either of Bacteroidetes, Betaproteobacteria and Microgenomates (OP11), or of Planctomycetes, Betaproteobacteria and Bacteroidetes members, whereas in two of them, a notable Microgenomates population was identified. At the lower taxonomic level, bacterial communities comprised mostly of Microgenomates, Comamonadaceae, Flavobacteriaceae, Legionellales, SM2F11, Parcubacteria (OD1) and TM7 members, although at different proportions in each sample. The abundance of OTUs shared in common among samples exceeded 70%, with the exception of samples in which the proliferation of Planctomycetaceae, Phycisphaeraceae and Candidatus Methylacidiphilum spp. lowered their relative abundance. Multi-variable analysis indicated that As, Pb and Sb were the main environmental factors influencing bacterial profiles. |