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. 2017 Sep 1;54(5):1385-1389.
doi: 10.1093/jme/tjx083.

Habitat and Density of Oviposition Opportunity Influences Aedes aegypti (Diptera: Culicidae) Flight Distance

Affiliations

Habitat and Density of Oviposition Opportunity Influences Aedes aegypti (Diptera: Culicidae) Flight Distance

Heidi E Brown et al. J Med Entomol. .

Abstract

Understanding the dispersal of Aedes (aegypti (L.) Diptera: Culicidae) after consuming a potentially infectious bloodmeal is an important part of controlling the spread of the arboviruses it transmits. Because of the impact on abundance, removal of oviposition sites is a key component of vector control. However, source reduction around a case may encourage dispersal of potentially infected vectors. We compare the effect of oviposition site availability on Ae. aegypti dispersal behavior within 30-m linear cages in three model ecosystems at the University of Arizona's Biosphere 2 research facility. We found a significant interaction effect in which, when oviposition site density was sparse, dispersal was greater in the highly vegetated humid rainforest and limited in the low vegetation, arid desert model ecosystem. When oviposition site density was dense, no significant effect on dispersal was observed. These analyses support the idea that source reduction has an important influence on the distance that gravid, potentially infected, females will travel.

Keywords: climate; egg laying, Aedes aegypti; flight distance.

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Figures

Fig. 1
Fig. 1
Images of the flight cages in each of the model ecosystems, from left to right: tropical rainforest, savanna, coastal fog desert. Below the photographs are schematics of the experimental cages, with the sparse oviposition condition represented above and the dense condition below. The black squares represent oviposition containers and the vertical lines indicate how the cages were divided into proximal, medial, and distal sections for analysis.
Fig. 2
Fig. 2
Box plots showing percent of eggs laid at each distance by model ecosystem. The left and right plots shows the sparse and dense (11 m and 1.5 m) intervals of oviposition containers.

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