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Universidade Federal do Rio Grande do Norte (UFRN) 2021

Mosquitos vetores (Diptera : Culicidae) do semiárido brasileiro : fatores bioecológicos e socioepidemiológicos

Inácio, Cássio Lázaro Silva

Titre : Mosquitos vetores (Diptera : Culicidae) do semiárido brasileiro : fatores bioecológicos e socioepidemiológicos

Mosquito vectors (Diptera : Culicidae) in the brazilian semiarid region : bioecological and socio-epidemiological factors

Auteur : Inácio, Cássio Lázaro Silva

Université de soutenance : Universidade Federal do Rio Grande do Norte (UFRN)

Grade : Doutorado em Desenvolvimento e Meio Ambiente 2021

Résumé partiel
Mosquitoes are insects present all over the planet. Currently, about 3,578 species are known. In Brazil, about 530 mosquito species are reported, among which some are considered vectors of pathogens that cause diseases. It is estimated that about 80 species occur in seasonal tropical dry forest (Caatinga), an exclusively Brazilian biome. In the Brazilian state of Rio Grande do Norte, 76 species have been recorded. The blood feeding, on the part of females, ends up favoring the infection and transmission of pathogens. Rio Grande do Norte has been suffering over the years with epidemics of Dengue, Zika, and Chikungunya, diseases whose main vector is the Aedes aegypti. Studies on the mosquito fauna in the state are still scarce, requiring further research for a better understanding of the relationships of these insects in the transmission of pathogens and the environment. In this sense, the present work sought to inventory the fauna of Culicidae in the municipality of Currais Novos in urban and preserved natural areas, aiming to understand the bio-ecological and socio-epidemiological interactions. In the urban area, monthly monitoring of the Aedes aegypti population was performed using ovitraps. The traps were installed and in the intra-domicile, equidistant about 300 m, installed and exposed for seven days and then replaced. The Ovitrap Positivity (OVI), Egg Density (ODI) and Mean Egg Index (IMO) were calculated for each period studied, which are important for understanding the population dynamics and reproductive period of mosquitoes. A total of 92,340 eggs were collected during the study, between May 2018 and March 2020. The positivity index of ovitraps showed a positive correlation with precipitation. Viral research in adult insects from the collected eggs revealed a possible new insect-specific virus by phylogenetic inference methods : Maximum Likelihood, Maximum Parsimony and Neighbor-Joining. In a forest environment, eggs, larvae, pupae, and adults were investigated. Eggs were collected using ovitraps. Immature insects were collected by active search in natural breeding sites, and adult insects by Shannon traps. All collections occurred once a month, in the preserved area in the period from April 2017 to March 2020 in the Cânion dos Apertados in Currais Novos. A total of 15 taxa were found, being 14 of immature and 13 of adult mosquitoes. The correlation of the insects with local climatic variables was verified, with temperature as the predominant climatic component

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