Sazonalidade climática e os efeitos na helmintofauna parasita de Dendropsophus nanus (Anura: Hylidae) da RPPN Foz do rio Aguapeí, município de Castilho, São Paulo

• Autor(a) principal: Wilson, Fabrício Marcel [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/132099; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/05-10-2015/000849656.pdf
• topic: Helminto - Distribuição sazonal; Anuro; Classificação climatica; Secas; Climatic classification; Anura; Aguapeí, Rio (SP)

Parasites play an important role in maintaining the local diversity of hosts and the ecosystem functions, however they are the first organisms that disappear because of human activities upon the nature. Seasonal variations related to the environment are important factors that directly or indirectly influence the host-parasite relationship and helminth community structure. This study aims to describe and compare the composition and helminth community structure associated with the amphibian anuran Dendropsophus nanus, from the RPPN Foz do Rio Aguapeí, municipality of Castilho, São Paulo State, in the dry and rainy hydro-periods. A total of 298 frogs were collected in four sampling efforts, two in the dry season and two in the rainy season, totaling 40 days of sampling. Parasitic parameters such as prevalence, mean intensity of infection, mean abundance and aggregation of parasites in host populations, as well as the structure of helminth community, were evaluated. A richness of eleven taxa was found, with the metacercariae of Lophosicyadiplostomum sp. the most abundant taxa, followed by Cylindrotaenia cf. americana. The helminth community reached a high pattern of aggregation. Cosmocercidae family specimens were classified as co-dominant in both hydro-periods. Cylindrotaenia cf. americana was dominant in the dry season and co-dominant in the rainy season, while Cosmocerca podicipinus and the oligochaeta Dero (Allodero) lutzi were co-dominant in the dry season. The other taxa were considered settlers without success. Even though the parasite diversity varied between periods and the diversity was higher in the dry season than in the rainy season, the results showed no difference in the prevalence parameters, mean infection intensity and mean abundance between the hydro-periods