Morphology
Lip size. Principal component analysis confirmed significant
divergence between sympatric pairs of lipped and generalized ecomorphs
in PC1 and PC2 space in all studied rivers (Fig. 3A). In three of the
six ecomorph comparisons non overlap was detected and the distributions
in PC-space were only weakly overlapping for other three comparisons of
sympatric ecomorphs. PC1 explained from 45.4 (Sore R.) to 71.7%
(Didessa R.) of the variance, while PC2 explained less than 36%.
Eigenvectors of the characters
for all PCs are given in
Supplementary Table S2. Middle
lobe length (MLL) and upper lip width (ULW) had the highest contribution
to divergence of sympatric ecomorphs.