Autor(es): Gleiser, RM; Urrutia, J; Gorla, DE

Resumo: An inverse relationship between larval density and adult body size has been reported for several mosquito species, affecting their survival and vector competence, response to repellents and other factors. Larvae of the floodwater mosquito Aedes (Ochlerotatus) albifasciatus (Macquart) (Diptera: Culicidae) develop quickly in temporary pools, so intraspecific competition (for food or space) might regulate population abundance and affect the size of adult mosquitoes. We investigated the temporal variation of adult female wing-length (an index of body-size) in natural populations of Ae. albifasciatus, using adults collected during each phase of the rainy season. The relationships between adult mosquito abundance, female wing-length, rainfall and temperature were analysed through simple regressions. Skewness of the frequency distribution of wing-lengths showed a strong negative relationship with mean wing-length. The distribution of wing-lengths varied seasonally and was correlated with rainfall 7-15 days previously as the major consequence of breeding site volume. Thus temporal variation of body size in natural populations of Ae. albifasciatus reflected density-dependent changes in the aquatic habitat where immature stages develop, influenced more by rainfall than by temperature or other environmental variables.

Palavras-Chave: Aedes albifasciatus; Body size; Density - Dependence; Floodwater mosquitoes; Population dynamics; Rainfall; Seasonality; Wing - Length; Lake Mar Chiquita; Argentina

Imprenta: Medical and Veterinary Entomology, v. 14, n. 1, p. 38-43, 2000

Identificador do objeto digital: 10.1046/j.1365-2915.2000.00217.x

Descritores: Aedes aegypti - Repellent

Data de publicação: 2000

INDICADORES

ACESSO