Genomic amplicon data of supraglacial samples for the 16S gene
The extracted DNA was amplified using prokaryotic primers targeting the  16S rRNA gene (341F: 5-CCTAYGGGRBGCASCAG-3 and 8065R: 5 GGACTACNNGGGTATCTAAT-3; (Hansen et al., 2012)). The samples were pooled equimolarly, and the final library was sequenced on an Illumina MiSeq using the V2 500-cycle kit (Illumina Inc., San Diego, California, USA), generating 2250 bp reads.