Bars and boxplots illustrate the variation in: (a, b) taxon richness, (c, d) total abundance, (e, f) STAR_ICMi index and (g, h) abundance-based Flow-T index over time and between the downstream (D; gray) and upstream (U; white) sampling stations. In boxplots: horizontal black line = median; lower and upper box edge = first and third quartiles, respectively; vertical lines indicate ±1.5 interquartile distance.