Resource turbulence. For each run, we calculate for all resources the sum of absolute changes in resource abundance through time, and then sum over the resources. Thus we arrive at a single number indicating how turbulent resource dynamics have been through a run. For each selection regime the difference between the local and null model is statistically significant. For σ = 0.2, 1.0 and 5.0 the Wilcoxon rank-sum test (alternative hypothesis: local less than null) results in, respectively, p < 2.73·10-6, p < 5.97·10-8 and p < 1.38·10-12.