The relationship between the natural logarithm of the contributing area for each quadrat, and the community water content and the moss health measurements are shown in Figs. 6 and 7 respectively. There was a significant correlation between the 2008 field measured variables and modelled water availability with R2 values for the natural log of water content:.44 (n = 30, p < .0001) and mosshealth:.57 (n = 30, p < .0001).