Navegando por Autor "SANTOS, Emerson Monteiro"

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Estudo de Simuliidae (Diptera : Nematocera) e seus criadouros em igarapés do município de Santo Antônio do Tauá, estado do Pará, Brasil
(Universidade Federal do Pará, 2001-05-03) SANTOS, Emerson Monteiro; GORAYEB, Inocêncio de Souza; http://lattes.cnpq.br/2391620537048479
Considering the importance of black flies to human and animal health and to stream ecology, the simuliid fauna of Santo Antônio do Tauá. Pará state, northern Brazil, was studied through determination of the breeding habitat, introduction in streams of artificial breeding substrates for colonization by larvae, analysis of the aquatic insects associated with simuliid breeding sites, biting times and frequencies of anthrophilic black fly species, qualitative and quantitative analyses of the vegetation at breeding sites, physical and chemical analyses of stream water at these sites, analyses of local weather conditions, and morphometrics of immature Simulium quadrifidum to determine the number of larval instars. The aquatic insect faunas and the respective relative abundances of Simuliidae in two streams were studied. The species that were collected are Simulium perflavum, Simulium quadrijidum, Simulium incrustatum and Simulium goeldii. The immature forms of Simulium perflavum were the predominant ones in disturbed environments, clear waters. Simulium quadrifidum predominated in generally unaltered, black water environments, with low nutrient levels. Simulium incrustatum was more abundant in environments with low vegetation and found Only in clear waters. Simulium goeldii was registered only in areas of primary forest (that is, those showing little alteration) and was more abundant in black waters. The factor that most interfered with simuliid larvae colonizing the artificial substrates was the constant oscillation in the water level of the streams during the time that these substrates were exposed in the water. Aquatic insects were more abundant during the dry season. The biting habits of female Simulium incruslatum were studied for the first time in Pará: two daily peaks in biting frequency were observed with human volunteers, one in the morning and the other in the afternoon, with biting frequencies showing significant differences among vegetation types during these periods, and a significant negative correlation with air temperature in secondary forest during the dry season. The number of larval instars was determined for Simulium quadrificlum, and females of this species were found to oviposit only during the afternoon at 16:30h. New records of predators of adult black flies are presented.