Arctic Ocean Survey Bacteria
DNA was extracted from small size fraction biomass (< 3 µm).  Library was produced by amplifying bacterial V6-V8 region of the 16S rRNA gene with the following specific primers: B969F (5'-ACGCGHNRAACCTTACC-3') and BA1406R #5'-ACGGGCRGTGWGTRCAA-3'# as described in Comeau et al. (2011).