Contribuição ao estudo da biologia dos Tripanossomas de Anuros neotropicais

Abstract

The present research had as its main goal, checking the infection through trypanosomes in Anuran around Mato Grosso and Rio de Janeiro States. For that purpose 20 species from Bufonidae, Microhylidae, Hylidae and Leptodactylidae families were collected during the fauna rescue activities at Guapore Power Station the border of Vale de São Domingos, Pontes Lacerda, MT and in Seropédia County, at the Rural Federal University Campus in Rio de Janeiro, RJ. Trypanosomes were found in blood smears and organ impressions in 36,36% of the Osteocephalus sp. studied hosts, 50% of Leptodactylus chaquensis, 100% of Leptodactylus fuscus, 100% of Leptodactylus Lineatus and 100% of Leptodactylus ocellatus. Polimorfism was verified on the founded species, splitting into Trypanosoma sp.1, Trypanosoma sp.2, Trypanosoma chattoni, Trypanosoma rotatorium (lato sensu) and Trypanosoma sp.3 that exhibit high polymorphism. Periferal blood samples were inoculated through diphasic blood Agar and LIBHIT-K, liquid fase. Isolates of Trypanosoma sp.3 were obtained from three out of four collected hosts. Trypanosomes were observed 4 days after the inoculation, kept in cultures for 8 months and samples were taken for ultrastructural analysis. Epimastigotes, sphaeromastigotes and trypomastigotes were the culture forms founded. Binary fission was noticed in epimastigotes and in sphaeromastigotes only, trypomastigotes were not observed in reproduction. The ultrastructural analysis of Trypanosoma sp.3 confirmed its singularity through morphological characteristic such as elongated glicosomes. This research accomplishes its first record of the infection through trypanosomes in the Anuran Osteocephalus genre and in the species of Leptodactylus fuscus, Leptodactylus lineatus and the presence of T. chattoni in the Leptodactyllus species in Brazil. The usage of LIBHIT-K as an effective mean for Trypanosoma sp.3 maintenance and the first records of ultrastructure anuran trypanosomes in Brazil.