Fig. 5: Alpha diversity indexes (Pielou evenness, Shannon, observed features, and Faith’s phylogenetic diversity) of acidogenic samples grouped by substrate, product, inoculum, and bioelectrochemical characteristic.

The line and square in the box mark the mid-point and average values of the data, respectively. The upper and lower edges of the box mark that the seventy-five and twenty-five of the data fall below the upper quartile and the lower quartile, respectively. The upper and lower whiskers represent the maximum and minimum values respectively, excluding outliers. The black diamond represents the outlier.