Fig. 3


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Changes in yearly mean average taxonomic distinctness (Δ+) and taxonomic variability (Λ+) over 35 years in the Chicago Area Waterway System indicate a more taxonomically diverse ecosystem in 2019 than 1985. Lines represent significant piecewise regressions (minimum of 3-yr spans; α = 0.05). Different shapes represent groups with significantly different (A = circles vs. B = squares) or shared (AB = diamonds) means (α = 0.05) within each index.

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