Navegando por Autor "Dias, Fernando Braga Stehling"
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Item Ecological aspects of Rhodnius nasutus St l, 1859 (Hemiptera: Reduviidae: Triatominae) in palms of the Chapada do Araripe in Ceará, Brazil.(2008) Dias, Fernando Braga Stehling; Bezerra, Cláudia Mendonça; Machado, Evandro Marques de Menezes; Casanova, Cláudio; Diotaiuti, Liléia GonçalvesThe aim of this work is to present aspects related to the ecology of Rhodnius nasutus Stål, 1859 in palms from Chapada do Araripe in Ceará, Brazil. The following five species of palms were investigated: babaçu (Attalea speciosa), buriti (Mauritia flexuosa), carnaúba (Copernicia prunifera), catolé (Syagrus oleracea) and macaúba-barriguda (Acrocomia intumescens). Fifth palms were dissected (10 specimens for each species). The overall infestation index was 86%, with a total of 521 triatomines collected. The Trypanosoma cruzi Chagas, 1909 Index was 16.8% and two insects presented mixed infection with Trypanosoma rangeli Tejera, 1920. A precipitin test showed that R. nasutus from palms of Chapada do Araripe are associated with opossum and bird although other possible bloodmeals were observed. Our results showing a high index of infestation of the palms as well as T. cruzi infection, the association of R. nasutus with the most diverse species of palms and proximity of these palms to houses demonstrate the importance of this area for sylvatic T. cruzi transmission and suggest the need for epidemiological surveillance in the region of the Chapada do Araripe.Item First report on the occurrence of Trypanosoma rangeli Tejera, 1920 in the state of Ceará, Brazil, in naturally infected triatomine Rhodnius nasutus Stal, 1859 (Hemiptera, Reduviidae, Triatominae).(2007) Dias, Fernando Braga Stehling; Diotaiuti, Liléia Gonçalves; Romanha, Alvaro José; Bezerra, Cláudia Mendonça; Machado, Evandro Marques de MenezesThe aim of this work was to identify and report the occurrence of Trypanosoma rangeli and Trypanosoma cruzi in naturally infected Rhodnius nasutus (Hemiptera, Reduviidae, Triatominae) in the state of Ceará, Brazil. Triatomines feces, salivary glands, and hemolymph were collected for fresh examination, and specific detection of T. rangeli and T. cruzi DNA by polymerase chain reaction was carried out. The specific characterization of these two parasites showed the simultaneous presence of both parasites in two (7.7%) of the 26 pItem Influence of the palm tree species on the variability of Rhodnius nasutus Sta˚ l, 1859 (Hemiptera, Reduviidae, Triatominae).(2011) Dias, Fernando Braga Stehling; Paula, Alexandre Silva de; Belisário, Carlota Josefovicz; Lorenzo, Marcelo Gustavo; Bezerra, Cláudia Mendonça; Harry, Myriam; Diotaiuti, Liléia GonçalvesThis work evaluated the occurrence and genetic structure of Rhodnius nasutus sampled in two sites using morphometry and microsatellites. These sites, presented distinct abiotic features and palm trees: (i) nine Attalea speciosa palm trees, so called babacu, were sampled from the Meruoca Mountain Ridge, a sloping region of reminiscent forest in the state of Ceara´ , Brazil, and (ii) 17 Copernicia pruniferapalm trees, so called carnauba, were sampled in the scrub savanna region (Sobral district) that surrounds the mountain ridge. Of the twenty-six palm trees dissected, 70.6% of carnauba and 88.9% of babac ¸ u were infested by R. nasutus. The micro-climatic data where R. nasutus were sheltered demonstrated that the babacu and carnau´ ba palm trees presented significant differences ( p < 0.05) in relation to the external environment, except for temperature and relative humidity regulation, suggesting that the architecture of the babac¸ u crown keeps a more stable micro-environment. The morphometric studies of the F1 generation demonstrated that insects from the babacu(A. speciosa ) were significantly larger ( p = 0.000) than those collected in carnauba ( C. prunifera) palm trees. Also, microsatellite analysis demonstrated a high genetic differentiation between the two groups of R. nasutus (R st = 0.77). Our results suggest that the difference in size between the populations is probably related to an incipient process of genetic drift in populations associated to each palm tree, probably also driven by the different climatic features observed in these micro-environments.