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).