Abstract: | A total of 247 clones of 16S rRNA genes from microorganisms captured by 0.2- and 0.1-μm-pore-size filters from sedimentary and granite rock aquifers were amplified and yielded 37 operational taxonomic units (OTUs). Fifteen OTUs captured by 0.1-μm-pore-size filters were affiliated with the candidate divisions OD1 and OP11, representing novel lineages. On the other hand, OTUs captured by 0.2-μm-pore-size filters were largely affiliated with Betaproteobacteria. |