Effects of sublethal concentrations of diflubenzuron and methoprene on Aedes aegypti (Diptera: Culicidae) fitness
The effects of sublethal concentrations of the insect growth regulators (IGRs) diflubenzuron and methoprene on some fitness components of an Aedes aegypti (L.) population in south-eastern Brazil were investigated. The fourth instar larvae of the mosquito were exposed to 20ppb methoprene and 3ppb diflubenzuron, and adult survivors were evaluated for fitness parameters, including body size and biomass, fecundity, fertility, longevity and symmetry. The sublethal concentrations had negative effects on longevity, but biomass, fecundity and fertility were not affected by either IGR. In separate experiments, A. aegypti individuals’ surviving concentrations of 2, 3 and 3.5 ppb diflubenzuron and 5, 10 and 20ppb methoprene were used for morphological analyses (size and symmetry). Diflubenzuron had negative effects on the mosquito’s body symmetry. The observed decreases in longevity and symmetry may have negative impacts on the population dynamics of A. aegypti.
Key wordsAedes aegypti diflubenzuron methoprene insect growth regulator fluctuating asymmetry south-eastern Brazil
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- FUNASA (Ed.) (2001) Dengue: instruqoes para pessoal de combate ao vetor — manual de normas técnicas. Ministério da Saúde, Brasilia. 84 pp.Google Scholar
- Leary R. F. and Allendorf F. W. (1989) Fluctuating asymmetry as an indicator of stress: implications for conservation biology. Tree Physiology 4, 214–216.Google Scholar
- Manly B. F. J. (Ed.) (1994) Multivariate Statistical Methods. Chapman & Hall, London. 215 pp.Google Scholar
- O’Donnel P. P. and Klowden M. J. (1997) Methoprene affects the rotation of the male terminalia of Aedes aegypti mosquitoes. Journal of the American Mosquito Control Association 13, 1–4.Google Scholar
- Sawbi R., Klowden M. J. and Sjogren R. D. (1992) Sublethal effects of larval methoprene exposure on adult mosquito longevity. Journal of the American Mosquito Control Association 8, 290–292.Google Scholar
- Systat (2002) Systat® for Windows® version 10.2. [S.l.]: © Systat Software.Google Scholar
- Tripleton C. A. and Johnson N. F. (Eds) (2005) Borror and DeLong’s Introduction to the Study of Insects. Thomson, Belmont, CA. 864 pp.Google Scholar
- Zar J. H. (Ed.) (1984) Biostatistical Analysis. Prentice Hall, New Jersey. 718 pp.Google Scholar