Figure 1.

Alpha diversity of ARGs and BMRGs. Bar diagrams show the chao1 richness (A) and Shannon diversity (B) of ARGs and BMRGs based on ARGs/BMRGs subtypes in influents, sludges, and effluents of four WWTPs. Data are mean±standard deviation. The Chao1 richness of ARGs/BMRGs for influents of MNIT or EHCC were identical in two replicas, therefore the standard deviations for them were zero. Significances between the influents of MNIT/JC/JNU vs. influent of EHCC (outside brackets) and between influent and sludge/effluent for each WWTP (inside brackets) were indicated by using Welch’s t-test. ^*p<0.05; ^**p<0.01; ^***p<0.001; ns, not significant.