Phylogenetic breakdown of metagenomic soil samples. ( a) shows the high level classification of the metagenomics reads across 10 samples (two field replicates from each of 5 different sites), with the number of reads identified as bacterial at the top of each column, in thousands. ( b) shows the differences between samples from the MDE and NCD sites across all 402 interior nodes of the phylogenetic tree. Symbol size indicates number of recruited reads, while color indicates the statistical significance of the change (p-values: blue ~0.05, red ~0.000001). Triangles which point up indicates a higher prevalence in MDE; triangles with point down indicates a higher prevalence in NCD.