Toxicidade e respostas comportamentais ao ozônio em populações de Rhyzopertha dominica

• Ano de defesa: 2013
• Autor(a) principal: Grisales, Luz Paola Velasquez
• Orientador(a): Faroni, Lêda Rita D'antonino
• Banca de defesa: Corrêa, Alberto Soares
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Entomologia
• Departamento: Ciência entomológica; Tecnologia entomológica
• País: BR
• Palavras-chave em Português: Rhyzopertha dominica; Controle; Ozônio; Toxicidade
• Palavras-chave em Inglês: Rhyzopertha dominica; Control; Ozone; Toxicity
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOSSANIDADE::ENTOMOLOGIA AGRICOLA
• Link de acesso: http://locus.ufv.br/handle/123456789/3976

This study was carried out to evaluate ozone toxicity to five populations of Rhyzopertha dominica (Coleoptera: Bostrichidae) collected in Brazil, and to verify the influence of the gas on populations locomotor behavior. Also, respiratory rates (CO2 production) and body mass were assessed to establish their relationship with susceptibility levels and behavioral patterns. Ozone toxicity was determined through time-response bioassays at the ozone concentration of 500 ppm in a continuous flow of 1,5 L min-1. Mortality results were used to create time-response curves, and TL50 y TL95 were estimated and used to calculate toxicity ratios. Results indicated that none of the evaluated populations of R. dominica showed resistance to ozone. Locomotor bioassays were conducted in the presence and the absence of ozone to determine locomotion behavioral patterns (distance, walking velocity and rest time); nevertheless, the locomotor behavior of the insects in the presence of ozone was proportional to the behavior in its absence. There were not observed significant correlations between ozone toxicity and locomotion behavioral patterns. Moreover, it was observed that the locomotor behavior of the insects was not influenced by either their body mass or their respiratory rate. Different respiratory patterns were observed among the treatments, which indicate that R. dominica individuals are able to reduce their respiratory rates which can be a defense mechanism to avoid the toxic effects of the gas. On the basis of the results of this study it is possible to conclude that ozone has a effect on Rhyzopertha dominica mortality, so this gas is an alternative to traditional insecticides.