Figure 5: A representation of the effect of grain size on drivers of native plant species richness on Marion Island: a.elevation, b. northness, and c. topographical wetness index (TWI). Effect of each of the significant predictors of Δ9-1 for native species is shown: the green and yellow lines show the effect of the predictor variable on species richness at large and small grains respectively. The effect of grain size on richness is further illustrated in schematics showing how richness changes in large and associated nested small plots along gradients of each of the significant predictors of Δ9-1. Coloured letters represent different species. Only species that do not occur in the small plot but occur in the large plot are added to the area of the large plot.