Estimated local species richness from quantitative samples
increases with increasing latitude (Fig. 2), similar to the
pattern found for estimated regional species richness (Fig.
1A, Table 1). This strongly suggests that the latter pattern is
not an artefact despite its close resemblance to regional
sampling intensity (Fig. 1B). ACE-estimates correlate with
the number of sampled individuals (N = 9, r2 = 0.77, p