Fig. 5

Multidimensional Scaling Plot of pairwise expression differences, based on normalized log2 counts per million for the differentially expressed genes in the transcriptome-wide gene set. Note the discrete break between the two populations (allopatric and sympatric). Also note the higher level of dispersion for sympatric samples than allopatric samples. Numbers inside points correspond to the last two digits of the sample IDs in Additional file 1: Table S10