Figure 1. Rank abundance distribution of native and exotic species.

Rank abundance plot showing maximal percent cover of native (N=1305) and exotic plant species (N=193) versus the relativized rank abundance, 100 R/N where R is the rank abundance of a native or introduced species (1 to N) and N is the total number of native or exotic species in the sample. The 95% confidence intervals (dashed lines) are calculated using 10,000 random bootstrap samples of 193 native species (grey lines). In this way, the confidence intervals control for the differences in the number of native and exotic species in the total data set.