Influência da densidade de larvas de Culex quinquefasciatus Say, 1823 (Diptera, Culicidae) sobre período e viabilidade de larvas e pupas, razão sexual e morfometria de adultos, em laboratório

• Ano de defesa: 2013
• Autor(a) principal: Felchicher, Francielly
• Orientador(a): Ribeiro, Paulo Bretanha
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Pelotas
• Programa de Pós-Graduação: Programa de Pós-Graduação em Parasitologia
• Departamento: Biologia
• País: BR
• Palavras-chave em Português: Culicídeo; Intraespecífica; Competição; Tamanho; Dieta
• Palavras-chave em Inglês: Culicid; Intraspecific; Competition; Size; Diet
• Área do conhecimento CNPq: CNPQ::CIENCIAS BIOLOGICAS::PARASITOLOGIA
• Link de acesso: https://guaiaca.ufpel.edu.br/handle/123456789/2333

The Culicidae have importance in human health and other animals, as they constitute the group with higher vectorial capacity of pathogens among hematophagus arthropod. Among the mosquitoes Culex quinquefasciatus Say, 1823 (Diptera, Culicidae) shows high synanthropy and consequently high public health relevance, like vector of various pathogens such as Oropouche virus, nematodes such as Wuchereria bancrofti, Brugia malayi and Dirofilaria immitis, and the nuisance they cause to man in urban areas. The female of C. quinquefasciatus oviposit in breeding high in organic material such as sewage, drains, ditches open, with few natural enemies, as a result the high population of these individuals in urban areas. In order to evaluate the influence of the density of larvae of C. quinquefasciatus, experiments were performed with a fixed availability diet (100mg/L-1) and proportional diet to the number of larvae (1.9mg/larvae/L). The results show that the larval period of C. quinquefasciatus varies from 16.81 to 27.36 days to a density of 200 and 1250 larvae, respectively on restricted diet treatment. In the treatment with proportional diet showed no change in the larval period. Larval density with restricted diet and proportional diet did not affect the pupal period. The period of adult emergence was inversely proportional to larval density, ranging from 17 to 32 days, from the larvae hatching in restricted diet and 6-7 days on proportionate diet. On treatment with restricted diet larval viability varied inversely with density, to proportional diet did not show influence in the larval viability, while the pupal viability was not affected by density. The density of larvae, with or without food restriction did not affect the size of the adults, presenting only size difference between the sexes, with females larger than males, regardless of treatment. The sex ratio was influenced by the density of larvae when available restricted diet, varying inversely proportional. The result of food competition in the larva stage reduces the sex ratio without compromising the size of the adults, which may suggest that the next generation the reproductive performance will be maintained, but with population decrease due to reducing the number of females.