Figure 2. Spread dynamics of spatially sorted and shuffled invasion replicates.

Lines show raw invasion trajectories (invasion extent through time) for all replicates in the spatially sorted (red solid lines) and shuffled (blue dashed lines) invasions (nine replicates each). Spatially sorted replicates invaded faster, on average, than shuffled replicates (model selection results in Supplementary Table 2). Variance in spread from one generation to the next (within-replicate variance) was similar between treatments but spatially sorted replicates had a larger among-replicate variance in invasion speed (Supplementary Figs 1 and 2 and Supplementary Table 3).