Fig. 2

Neighbour joining tree based on 16S rRNA gene sequences showing the phylogenetic position of D. alkaliphilus AHT2^T to other species within the Deltaproteobacteria class. The Firmicutes were used as an outgroup and subsequently pruned from the tree. The black dots indicate a bootstrap value between 80 and 100 %. The scale bar indicates a 1 % sequence difference. The tree was constructed with the ARB software package [37] and the SILVA database [19]. The bootstrap values were calculated using MEGA-6 [38]