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Insects 2020-Aug

Impacts of Dietary Nutritional Composition on Larval Development and Adult Body Composition in the Yellow Fever Mosquito ( Aedes aegypti)

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Tess van Schoor
Erin Kelly
Nicole Tam
Geoffrey Attardo

Mots clés

Abstrait

Background: the mosquito Aedes aegypti (Ae. aegypti) is an important vector of arboviruses, including Zika, Dengue, and Chikungunya. The dietary requirements of larval Ae. aegypti are not well understood and likely impact developmental and physiological parameters knowledge of which could be important for vector control. This study examines the effects nutrition has on growth and development of larval Ae. aegypti of laboratory-reared Rockefeller strain mosquitoes.

Methods: mosquito larvae were split into five feeding groups with diets providing different ratios of protein and carbohydrates. Each group received autolyzed Brewer's yeast (AY - high-protein), and/or rice flour (RF-high-carbohydrate). The groups were monitored to record larval developmental times, adult sizes and nutritional stores.

Results: the 100% AY group failed to pupate, suggesting the AY alone is either lacking in critical nutrients or is toxic at higher concentrations. The 100% RF group resulted in the smallest adults that took the longest time to reach pupation. Of the remaining groups, the 25% AY/75% RF (Med-low) diet yielded adult mosquitoes with highest average weight, wing length, and lipid stores relative to the other diets.

Conclusions: the dietary requirements for development, body size, and nutrient stores of Ae. aegypti mosquitoes appear to be dependent on a relatively low but essential proportion of dietary protein to carbohydrates to achieve optimal developmental outcomes.

Keywords: Ae. aegypti; carbohydrates; diet; larval development; lipids; nutrition; protein; pupation.

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