Figure 2. The relationship between a) richness of survey native macrophyte species and Elodea canadensis lake percentage of occurrences at all the study lakes (Loughs). Kilturk Lough was identified (blue star) as an outlier and subsequently excluded in the second plot analysis. The relationship between richness of native macrophyte species and E. canadensis abundance at each lake sampling points in lake Group 1 (b); lake Group 2 (c) and (d) lake Group 3 . Pearson correlation coefficients, LOESS line trend and significance for ach analysis are indicated at each plot. *p<0.05; **p<0.01; ***p<0.001.