Mitochondrial DNA divergence
Among the 213 individuals
sampled, 49 different haplotypes were detected. The haplotype network is
complex (Fig. 5) and composed of five main haplogroups that correspond
to i) Blue Nile basin (including the Didessa R.), ii) Genale R. (Indian
Ocean basin), iii) Gojeb R. (Omo-Turkana basin), iv) Birbir R. (White
Nile basin), and v) Sore R. (White Nile basin) (Fig. 5). A few samples
from the Didessa R. and Birbir R. were close to central putative
haplotypes interconnecting the analyzed haplogroups.
Genetic p -distances
between the geographic basins varied from 0.009±0.003 to 0.031±0.005
(Supplementary Table S9). No haplotype sorting between sympatric
generalized and thick-lipped ecomorphs within each basin was revealed
(Fig. 5).