Figure 3. a ) Boosted Regression Trees (BRT) variance partitioning scheme on the three-study lake groups showing the pure and shared proportions of explained and unexplained variance in Elodea canadensis abundance patterns by abiotic metrics and macrophyte biodiversity metrics; b) Diversity fraction of the BRT variance partitioning analysis showing the unique contribution of five native macrophyte diversity metrics (Shannon diversity, plant cover, submerged plant cover, floating plant cover and beta diversity) on E. canadensis abundance variation across the three-study lake groups; c) Abiotic fraction of the BRT variance partitioning analysis showing the unique contribution of three abiotic metrics (water clarity, longitude and latitude) on E. canadensis abundance variation across the three-study lake groups. Only percentages values of explained variation >10% are presented in the plots.