“…While the abundance of archaeal community was much lower in comparison with bacterial community, archaeal community was specially analyzed using nested PCR. In the nested PCR approach, the specific archaeal community was firstly amplified using the primers Arch340F (5 0 -CCCTAYGGGGYGCASCAG-3 0 ) and Arch1000R (5 0 -GAGARGWRGTGCATGGCC-3 0 ) as described by Gantner et al (2011), and then the PCR product was used as a template in the second PCR using the primers Arch349F (5 0 -GYGCAS CAGKCGMGAAW-3 0 ) and Arch806R (5 0 -GGACTACVSGGGTATC TAAT-3 0 ) (Takai and Horikoshi, 2000). Barcodes unique to each sample were incorporated before the forward primers, which allowed the identification of each sample in a mixture for an Illumina sequencing run.…”