Figure 4.

(a) Mean within- and between-group distances (1−Bray–Curtis Similarity) of communities in a given dispersal level at the initialization of the model (time 0) and after 6 years of exposure to different lignin/N treatments. Error bars represent s.e.m. (N=6). See Results for significance of lignin/N treatment for a given dispersal level. (b) Within-group distance as a proportion of the sum of within- and between-group distances, referred to as ‘relative stochasticity' in the text (compared with stochasticity measured by within-group distance in (a)).