Figure 1From: Diversity and dynamics of Archaea in an activated sludge wastewater treatment plantAccumulation curves of archaeal 16S rRNA gene sequences. 82 archaeal 16S rRNA gene sequences were assigned to OTUs based on similarity thresholds representing the division in phylum (80%), family/class (90%), genus (95%) and species (98.7%) levels[23, 24]. The accumulation curves show the rate of discovery of new OTUs at the different sequence similarity thresholds.Back to article page