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1 November 2006 Habitat Segregation of Mosquito Arbovirus Vectors in South Florida
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Oviposition traps set in rural to urban environments in three south Florida counties were colonized predominantly by Culex quinquefasciatus Say (35.1%), Aedes albopictus (Skuse) (34.5%), Aedes aegypti (L.) (23.8%), and Culex nigripalpus Theobald (6.6%) during 1 yr of monthly sampling. Significant differences were detected among counties for abundances of Cx. quinquefasciatus and for percentage composition of that species and Ae. albopictus. Aerial images of habitats around each collection site were digitized, and coverages by each of 16 habitat variables were recorded. Abundances of Ae. aegypti were positively related to habitat variables associated with urbanization and negatively correlated to those reflecting rural characteristics. Multiple regression models of habitat selection explained similar proportions of variances in abundance of Ae. aegypti and Ae. albopictus, but signs of significant variables were opposite for these two species. No consistent trends of habitat associations were observed among counties for the two Culex spp. Co-occurrences of the four species in individual traps depended on container type (tub versus cup), and, for Aedes spp. with Culex spp., county. The results underscore the importance of scale in evaluating habitat selection and the utility of quantifiable habitat characteristics of intermediate scale to identify site characteristics favored by the arboviral vectors Ae. aegypti and Ae. albopictus.

RESUMEN Trampas de oviposición localizadas in tres condados del sur de Florida fueron colonizadas principalmente por Aedes aegypti (L) (23.8%), Aedes albopictus (Skuse) (34.5%), Culex quinquefasciatus Say (35.1%), and Culex nigripalapus Theobald (6.6%) en muestreos mensuales durante un año. Se encontraron diferencias significativas entre los condados en la abundancia de Cx quinquefasciatus y en el porcentaje de esa especie y de Ae. albopictus. Imágenes aéreas de cada sitio de colección fueron digitalizadas y la cobertura por cada una de 17 variables relacionadas con el habitáculo fué anotada. La abundancia de Ae. aegypti fué correlacionada positivamente con variables relacionadas a la urbanización, y negativamente con aquellas que reflejan características rurales. Modelos de regresión múltiple de selección de habitáculo explicaron proporciones similares de la varianza en abundancia de Ae. aegypti y de Ae. albopictus pero los signos de las variable significativas fueron opuestos para las dos especies. No SE encontraron patrones consistentes algunos entre los condados para las dos especies de Culex. Cohabitación de las cuatro especies en las trampas dependió del tipo de trampa (tinas o tazas) y, para Aedes spp con Culex spp., en el condado. Los resultados recalcan la importancia de la escala de medidas y la utilidad de características cuantificables del habitáculo a escala media para identificar características de sitios preferidos por los vectores de arboviruses Ae. aegypti y Ae. albopictus.

Jorge R. Rey, Naoya Nishimura, Billi Wagner, Marieta A. H. Braks, Sheila M. O’Connell, and L. Philip Lounibos "Habitat Segregation of Mosquito Arbovirus Vectors in South Florida," Journal of Medical Entomology 43(6), 1134-1141, (1 November 2006).[1134:HSOMAV]2.0.CO;2
Received: 2 May 2006; Accepted: 19 July 2006; Published: 1 November 2006

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