Abstract
The diet and the eect of body size on the feeding habits of Trichomycterus crassicaudatus and Trichomycterus stawiarski, collected in the Jordão River, an import tributary of the Iguaçu River basin, were investigated. Samples were collected in august 2003 during the Jordão River Energetic Complex Aquatic Fauna Rescue and Monitoring program. Stomach contents were evaluated through the frequency of occurrence, permutational multivariate analysis of variance (PERMANOVA), si-milarity percentage analysis (SIMPER) and non-metric multidimensional scaling analysis (MDS) methods. A total of 86 stomach contents of T. stawiarski and 36 of T. crassicaudatus were assessed. The species presented an insectivorous feeding habit, with differences in the diet composition of the “smallest” and the “largest” individuals. Ephemeroptera nymphs, lar-vae and pupae of Diptera, organic detritus and plant fragments were the most important food items. Both species feeding habits were based mainly in benthic aquatic immature insects.
Highlights
The Iguaçu River basin is considered a global biodiversity hotspot (Abell, Thieme, Revenga, Bryer, Kottelat, Bogutskaya, et al 2008), because of the di9#*%#@&#$'#,"!@&)$'&#$')$4#*#'&0"%-&%(#!"#%&Q>?"3-/)&B&R5?/!@&:;;S=&L/%)&B&T",)@&:;;FGU&I-#&-"4-&'#4*##&of endemism of its ichthyofauna has been mentio$#'&?6&%#9#*)3&)5+-/*%&Q#U4U& #9#*"&B&V/*'#"*/@&NDDS=&Garavello, Pavanelli & Suzuki, 1997), and is probably due to its geographic isolation imposed by the Iguaçu falls
The Neotropical catfish family Trichomycteridae comprises more than 200 species of small-sized fishes which in general inhabit fast-flowing rocky streams
For the genus Trichomycterus, a probably non-monophyletic group of catfish with pronounced intraspecific variation in color pattern, the few available data are greatly disproportional to the large number of species
Summary
Garavello, Pavanelli & Suzuki, 1997), and is probably due to its geographic isolation imposed by the Iguaçu falls. In the Iguaçu River, ten species of Trichomycterus were recorded: Trichomycterus stawiarski — Miranda. L"?#"*/@& NDWF= Trichomycterus castroi — de Pinna, NDD:= Trichomycterus naipi — Wosiacki & Garavello,. The species T. davisi is the only non-endemic to the Iguaçu River basin. The Neotropical catfish family Trichomycteridae comprises more than 200 species of small-sized fishes (de Pinna & Wosiacki, 2003) which in general inhabit fast-flowing rocky streams. For the genus Trichomycterus, a probably non-monophyletic group of catfish with pronounced intraspecific variation in color pattern (de Pinna & Wosiacki, 2003), the few available data are greatly disproportional to the large number of species.
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