Thick-lipped and thin-lipped Midas cichlids in Apoyeque differ quantitatively in diet and trophic niche. (a) The proportion of gut contents per food category differs between thick- (n = 19) and thin-lipped (n = 22) fishes. (b) Multi-dimensional gut contents by morph displayed along the two primary axes. (c) Individual-level stable isotope values of δ13C and δ15N from thick-lipped (n = 29) and thin-lipped (n = 31) Apoyeque cichlids, with 95% confidence ellipses around the centroids.
Elmer et al. BMC Biology 2010 8:60 doi:10.1186/1741-7007-8-60