Counted values for each MOTU, corresponding nucleotide sequences that were amplified with Euka02 or Bact02, alignment scores of the best match in the reference database, sequence ids of the best match in the reference database and superkingdom, kingdom, phylum, class, order, family, genus and species to which each MOTU was assigned. Environmental and background variables include sampling season, flow state and habitat where sample was collected (flowing water, dry riverbed, isolated pool).