Feeding aspects of Knodus heteresthes (Eigenmann, 1908) and Moenkhausia lepidura (Kner, 1858) (Characiformes, Characidae) in the Teles Pires and Juruena Rivers, southern Amazon

Abstract The composition of the diet two species characids (Knodus heteresthes and Moenkhausia lepidura) was evaluated in Teles Pires Juruena Rivers, sampled September October 2016. We analyzed 226 stomachs K. 425 M. lepidura. analysis stomach contents based on volumetric frequency occurrence methods, applying food importance index. For similarity diets between we calculated niche overlap with Pianka’s Both River have a dietary preference for arthropods (IAi > 0.95). In is concentrated three sources both species: 0.52), vegetables 0.33) fish 0.12). dissimilar when compared to environments (ANOSIM, R ≥ 0.57, p < 0.001) high trophic (α 0.97), regardless environment. River, were classified as omnivorous an insectivorous tendency behaviour occurs.