Figure 5

The evolutionary relationship of arsC sequences. The phylogeny was reconstructed by maximum likelihood with 71 nucleotide sequences, 352 sites and TIM2 + I + G + F selected as best fit model. Support values for each node were estimated using the Akaike Likelihood Ratio Test (aLRT). Nodes with support values higher than 70% are highlighted with black circles. The reference sequences retrieved from the non-redundant database of the NCBI are shown in black and operational taxonomic unitis (OTUs) from AsV- and AsIII-enrichment cultures (EC) and sediment are shown in blue.