Figure 4. SI Bayesian ellipses showing trophic niche widths and overlaps in sympatric ecomorphs of the Labeobarbus spp. from the Birbir, Blue Nile, Didessa, Genale, Gojeb, and Sore Rivers. Ellipses with 95% confidence intervals are based on standard ellipses corrected for small sample sizes (SEAc; isotopic niche metrics; SIBER package). Each point corresponds to the isotopic value.
The total area (TA), standard ellipse area (SEA), and corrected standard ellipse area (SEAc) were analyzed for all sympatric ecomorphs except for thick-lipped ecomorphs from the Blue Nile and Birbir Rivers because of small sample size. The thick-lipped ecomorph had largest SEAc values in all rivers apart the Genale River (Supplementary Table S7). The niche overlap between generalized and thick-lipped ecomorphs consisted 25.7% in the Didessa River, 57.2% in the Gojeb River, and was considerably larger in the Sore and Genale Rivers (81.6 and 82.3%, respectively) (Supplementary Table S8).