Environmental Engineering Reference
In-Depth Information
3.2. Bacteria
3.2.1. Proteobacteria
The Proteobacteria was the largest and most diverse phylum in the present dataset. It
comprised a total of 5637 sequences, approximately 44.8% of the bacterial sequences,
assigned to 466 known genera. There are 2791 OTUs generated, with a Simpson diversity
index of 0.0020. All six classes within the Proteobacteria were represented, but the Delta-,
Gamma-, Beta-, and Alphaproteobacteria together represented over 99% of the
proteobacterial sequences (Figure 3). The class Epsilonproteobacteria and Zetaproteobacteria
were extremely rare, represented by 43 and 1 sequences respectively, indicating a low
recovery rate in most of wetlands.
Figure 1. Distribution of the length of retrieved 16S rRNA sequences.
Figure 2. Treemap of observed prokaryotic taxons shown in their hierarchical order. Treemap showing
taxonomic ranking of all taxa for all retrieved sequences. The size of each box is proportional to the
number of sequences assigned to that taxon with respect to the entire dataset. The placement of boxes is
arbitrary with respect to boxes within the same taxonomic rank and does not correspond to any form of
phylogeny or relatedness.
