Fig. 2From: Microbial assembly and co-occurrence network in an aquifer under press perturbationa Shannon diversity index across the sampling wells, calculated from data collected in the period 2018-2019. Each point represents a sample. The asterisk indicates an outlier. b Nonmetric multidimensional scaling (NMDS) plot of sites based on Bray-Curtis dissimilarity distance. R0: background well; R104: proximal well; R203: intermediate well; R402: distal wellBack to article page