Caracterização da dieta da lontra neotropical (Lontra longicaudis, Carnivora: Mustelidae) em três rios de Mata Atlântica do Sul do Brasil: uma análise espacial e temporal

• Ano de defesa: 2012
• Autor(a) principal: Krepschi, Victor Gasperotto
• Orientador(a): Fortes, Andréa Maria Teixeira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual do Oeste do Parana
• Programa de Pós-Graduação: Programa de Pós-Graduação Stricto Sensu em Conservação e Manejo de Recursos Naturais
• Departamento: Conservação e Manejo de Recursos Naturais
• País: BR
• Palavras-chave em Português: Mata Atlântica; conservação; ecologia alimentar; piscívoria
• Palavras-chave em Inglês: Atlantic rainforest; conservation; feeding ecology; piscivory; spraint analysis
• Área do conhecimento CNPq: CNPQ::CIENCIAS BIOLOGICAS::ECOLOGIA::ECOLOGIA DE ECOSSISTEMAS
• Link de acesso: http://tede.unioeste.br:8080/tede/handle/tede/727

The diet of Otter longicaudis was characterized by fecal analysis and spatial and temporal aspects in their main prey consumption were analyzed. The study was conducted systematically in three rivers of the Iguaçu National Park, an Atlantic forest reserve located in southern Brazil. For a year, samples were taken monthly along three sections totaling 46 km, in order to find fecal samples. The analysis of 367 fecal samples collected showed a piscivorous diet, which includes four main fish families: Characidae Cichlidae, Pimelodidae and Loricariidae, with consumption of crustacean belonging to the family Trichodactilidae. Mollusks, birds, mammals, reptiles and insects were found in the diet. Seeds, vegetable fibers and materials of anthropogenic origin were also found. Differences in diet composition were found between the Iguaçu River and the other, which is probably related to the physical characteristics of these rivers reflecting distinct prey items available. The crabs were used as complementary resources for neotropical otters, when the consumption of their main prey (fish) decreased. An increased frequency of occurrence of prey categories was recorded in spring and summer, except for crabs and molluscs in two of the three rivers, which contrasts with the high consumption of fish during all seasons. Correlation was found between precipitation and consumption of fish families, which in turn seems to be due changings and the river otter and the habits of those arrested. In this region, otters depend on the features of the aquatic environment, forecasting the Mayor attention to the maintenance of rivers, shores and natural features (such as flow regimes and water), especially the river Gonçalves Dias, borders the east side of the National Park Iguaçu, with areas of heavy anthropogenic land use