Macroinvertebrates registered at the study sites in the Del Gato stream basin from October 2014 through August 2015. (a): Family richness (S, left ordinate and grey bars) and the biotic index for the pampean rivers (IBPamp, right ordinate and black line) are plotted for each of the months at the three study sites indicated on the abscissa. (b): Invertebrate density (ind m⁻², left ordinate and grey bars) and Shannon diversity (H′; right ordinate and black line) are plotted for each of the months at the three study sites indicated on the abscissa. (c): Percentage of sensitive (white bar color), tolerant (grey bar color), and highly tolerant (black bar color) taxa are plotted on the ordinate for each of the months at the three study sites indicated on the abscissa.