Fig. 4

Regression of maple canopy basal area (BA) annual relative growth rate (RGR) (2012–2014) on ash mortality index (AMI) (2012). Each point represents one study site (the mean of 3 plots per site). The solid black line illustrates the line of the best fit to these site means, and the gray shaded region represents the standard error around that line. However, the statistics reported are based on hypothesis testing of plot data using linear mixed models (χ² = 5.60, p = 0.01) with “site” as the random factor