124 resultados para Nematóides


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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

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Pós-graduação em Ciências Biológicas (Zoologia) - IBB

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Pós-graduação em Agronomia (Proteção de Plantas) - FCA

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From November 2009 to January 2010 we collected 22 specimens of Physalaemus cuvieri from a preserved area (State Park of Serra do Mar - Núcleo Santa Virginia, São Paulo State, Brazil) and 21 specimens from a disturbed area with habitat fragmentation (rural areas – São Luis do Paraitinga municipality, São Paulo State, Brazil) to compare the helminth fauna associated to this anuro species. The helminth fauna is composed by the nematodes of family Cosmocercidae, Physaloptera sp. and Rhabdias sp. as well as Acanthocephalus saopaulensis in the individuals from the preserved area; the individuals from the fragmented area also presented nematodes of family Cosmocercidae, Physaloptera sp. and Rhabdias sp. as well as Oswaldocruzia subauricularis and the monogenea Polystoma cuvieri. Prevalence, mean intensity of infection, mean abundance, mean richness, importance index (IE) and Dominance frequency were calculated in both localities, but there was no statistical diference. The diversity of helminth species was calculated by Shannon, Brillouin and Berger-Parked index, and by using Shannon diversity t-test we compared helminths diversity associated with anfibian from this two localities

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A helmintofauna tem papel central no ecossistema, pois afeta a ecologia, evolução, crescimento e regulação da população de hospedeiros e, consequentemente, toda a biodiversidade. Neste estudo foram selecionados anuros pertencentes a uma guilda, de acordo com o modo reprodutivo e sítio de vocalização, e foi estudada a supracomunidade de parasitas associadas a estes anfíbios. Em janeiro de 2009 foram coletados 60 anuros no Pantanal Sul- Matogrossense, sub-região Miranda-Abobral no município de Corumbá, MS. As espécies de anuros coletadas foram Rhinella granulosa, R. schineideri, Pseudis paradoxa, P. limellum, Pleurodema fuscomaculata e Physalaemus albonotatus. Os anuros foram necropsiados e analisados quanto à presença de helmintos. Dezesseis espécies de helmintos foram identificadas em 50 indivíduos hospedeiros (prevalência total = 83,3%). Dentre os parasitas foram encontradas três espécies de trematódeos (Catadiscus marinholutzi, Catadiscus propinquus e Glypthelmins palmipedis), uma espécie de cestoda, Cylindrotaenia americana, dez espécies de nematóides (Aplectana sp., Contracecum sp.,Cosmocerca podicipinus, Cosmocercidae, Falcaustra mascula, Physaloptera sp., Ochoterenella sp., Oswaldocruzia subauricularis, Physalopteroides venancioi sp. e Rhabdias sp.) e cistos de acantocéfalo. Os trematódeos foram encontrados apenas em P. paradoxa e P. albonotatus, enquanto C. americana foi encontrada apenas em P. fuscomaculata. As espécies Aplectana sp. e Falcaustra máscula foi encontrada apenas em R. schineideri. O único indivíduo encontrado em P. limellum foi da espécie Physalopteroides venancoi. As suprapopulações de parasitas se mostraram mais agregadas em R. granulosa e P. paradoxa, onde seus hábitos de vida e hábitos alimentares podem influenciar na comunidade parasitária. Logo o tamanho do hospedeiro pode influenciar na sua ...(Resumo completo, clicar acesso eletrônico abaixo)

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Este estudo analisou a helmintofauna presente no anfíbio anuro Thoropa taophora coletados em uma ilha do Estado de São Paulo. Foram necropsiados 16 hospedeiros e recuperados 226 parasitas, todos nematóides, pertencentes a quatro taxa de helmintos: Physaloptera sp. (Physalopteridae), encontrados no estômago; Rhabdias sp. (Rhabdiasidae), encontrados no pulmão; Oswaldocruzia sp. (Molineidae), no intestino delgado; nematóides da família Cosmocercidae, no intestino delgado e intestino grosso e uma larva de parasita identificado apenas como pertencente à Classe Nematoda. A prevalência total foi 81,25%, de animais parasitados

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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The aim of this study was to report the burrowing owl Athene cunicularia as a new host for the filarid nematode Pelecitus sp. in southeastern Brazil for the first time, as well as reporting the occurrence of this nematode species in the body cavity, near the cervical air sac and lung region. This study contributes towards knowledge of parasitism in Brazilian wild birds and an anatomical region of the host as an infection site for Pelecitus sp.

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Chitin is an important structural component of the cellular wall of fungi and exoskeleton of many invertebrate plagues, such as insects and nematodes. In digestory systems of insects it forms a named matrix of peritrophic membrane. One of the most studied interaction models protein-carbohydrate is the model that involves chitin-binding proteins. Among the involved characterized domains already in this interaction if they detach the hevein domain (HD), from of Hevea brasiliensis (Rubber tree), the R&R consensus domain (R&R), found in cuticular proteins of insects, and the motif called in this study as conglicinin motif (CD), found in the cristallography structure of the β-conglicinin bounded with GlcNac. These three chitin-binding domains had been used to determine which of them could be involved in silico in the interaction of Canavalia ensiformis and Vigna unguiculata vicilins with chitin, as well as associate these results with the WD50 of these vicilins for Callosobruchus maculatus larvae. The technique of comparative modeling was used for construction of the model 3D of the vicilin of V. unguiculata, that was not found in the data bases. Using the ClustalW program it was gotten localization of these domains in the vicilins primary structure. The domains R&R and CD had been found with bigger homology in the vicilins primary sequences and had been target of interaction studies. Through program GRAMM models of interaction ( dockings ) of the vicilins with GlcNac had been gotten. The results had shown that, through analysis in silico, HD is not part of the vicilins structures, proving the result gotten with the alignment of the primary sequences; the R&R domain, although not to have structural similarity in the vicilins, probably it has a participation in the activity of interaction of these with GlcNac; whereas the CD domain participates directly in the interaction of the vicilins with GlcNac. These results in silico show that the amino acid number, the types and the amount of binding made for the CD motif with GlcNac seem to be directly associates to the deleterious power that these vicilins show for C. maculatus larvae. This can give an initial step in the briefing of as the vicilins interact with alive chitin in and exert its toxic power for insects that possess peritrophic membrane