Fig. 5

a, b Regressions of introduced seedling abundance (2012) on ash decline index (ADI) (2012) (a) and on shrub cover (2012) (b). Study sites (the mean of 3 plots per site) are divided into two topographical categories, upland (solid line) and wet (dotted line). Lines illustrate the best fit to these site means, and the gray shaded regions represent the standard error around that line