Figure 2.

(a,b) Results from the PCA of morphological data from sympatric island taxa in Wallacea (n = 135) and the Pacific (n = 128) (see the electronic supplementary material, figure S3), pruned to only include islands for which colonization was well separated in time with a putative late stage taxon-cycle taxon (filled symbols) and a more recent colonizer (open symbol). Identical colours indicate that taxa occur sympatrically. PC axes 1 and 2 are based on the covariance matrix of the log transformed morphological variables and explain 85% of the variation in Wallacea and 81% of the variation in the Pacific. Indicated to the right of each island name is the p-value of morphological separation among taxa within islands, following the permutational MANOVA tests.