Fig. 2.

Violin plots representing indicator bacteria determined in 15 monitoring events in five different sampling points (75 samples in total): AR-1 and AR-2 in the Arenales River (before and after the discharges of the southern wastewater treatment plant, respectively), CR in La Caldera River, and MR-1 and MR-2 in the Mojotoro River (before and after the discharges of the northern wastewater treatment plant, respectively). The concentrations of total (TC) and thermotolerant coliforms (TTC) are expressed as the Most Probable Number per 100 mL, while those of E. coli (EC) and Enterococcus sp. (EN) are in Colony Forming Units (CFU) per 100 mL. Violin shapes show the data kernel probability with the boxplots embedded. Boxplots show the interquartile range (IQR) in boxes divided by median values (horizontal lines) with whiskers depicting ±1.5 IQR and outliers as points. The segmented horizontal lines represent the limit values accepted by legislation for recreational water (USEPA, 2012). Bonferroni Post Hoc test from Kruskal Wallis was performed. Medians with different letters for each variable are significantly different (p < 0.05).