Figure 2

Microbial diversity across the transect. (a, b) Mean pairwise distance (MPD) of bacterial communities exhibited by each size fraction at each site in the surface (a) and SCM (b). Bootstraping revealed s.es. to be minimal. Larger values for MPD indicate a greater genetic distance between organisms within a community and likely higher alpha diversity (Kembel et al., 2011). (c) Taxonomic breakdown of bacterial communities based on the placement of core marker genes in reference trees. (d) Taxonomic breakdown of eukaryotic communities based on BLAST searches against PhyloDB (see Supplementary Methods). For panels c and d, communities were pooled across size fractions with normalization by the total superkingdom-specific reads within each size fraction.