Diversity metrics calculated on abundance (CPUEs; grey) and biomass (masses, black) suggest the fish community of the Chicago Area Waterway System is more diverse in 2019 than in 1985, although regressions were not linear. Lines represent significant piecewise regressions (minimum of 3-yr spans; α = 0.05). Different shapes represent groups with significantly different means (α = 0.05) within each index.