
Tab. 1. Alimentary Index (IAi) calculated for resources consumed by Gymnorhamphichthys rondoni and Gymnotus coropinae in first to third order streams at the Saracá-Taquera National Forest, Oriximiná, Pará. Codes: A - adult; Inv - Invertebrate; L - Larvae; P - Pupae; N - Nymphs; and T - terrestrial.Food itemsG. rondoniG. coropinaeIAi (%) (n = 41)IAi (%) (n = 60)Algae0.01-Aquatic Coleoptera (A)0.020.04Aquatic Coleoptera (L)0.300.52Arthropoda (T)0.291.02Ceratopogonidae (L)32.9916.81Chironomidae (L)18.8521.59Decapoda-0.01Diptera (L)0.480.93Eggs (Inv.)0.060.38Ephemeroptera (N)0.031.25Hydracarina<0.010.01Insect remains1.1114.48Odonata (N)<0.010.08Plant Remains0.095.52Pyralidae0.051.66Scales0.03<0.01Sediment/Detritus41.9232.72Trichoptera (L)3.772.92Zooplankton<0.010.04Total consumed items1818
