Figure 3 . Distance-based redundancy analysis based on the composition of bacterial guppy gut microbiomes (unweighted unifrac) in high predation streams, and in low predation streams, where HP fish (HP source, red) have been introduced either 30-60 years ago (old Intro, green) or 5-6 years ago (recent Intro, blue), and evolved to resemble native LP fish (black). (A) shows all site categories and (B) excludes HP source sites, showing sites in LP environments (LP native, old intro, and recent intro). Arrows show the predictor variables that explain changes in composition based on dbRDA, and length corresponds to dbRDA R2. Inset shows the partial R2variance partitioned for diet, gut length, and water temperature (grayscale) on unconstrained data. Table S2 shows dbRDA statistics and Table 1 and S3 show PerMANOVA results.