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Research article - Peer-reviewed, 2023

Odor-mediated response of gravid Aedes aegypti to mosquito-associated symbiotic bacteria

Mosquera, Katherine D.; Khan, Zaid; Wondwosen, Betelehem; Alsanius, Beatrix; Hill, Sharon; Ignell, Rickard; Lorenzo, Marcelo G.;

Abstract

Complex oviposition decisions allow gravid Aedes aegypti mosquitoes to select suitable sites for egg-laying to increase the probability that their progeny will thrive. The bacterial communities present in larval niches influence mosquito oviposition behavior, and gravid mosquitoes transmit key microbial associates to breeding sites during oviposition. Our study evaluated whether symbiotic Klebsiella sp., which are strongly associated with mosquitoes, emit volatiles that affect mosquito oviposition decisions. Dual-choice behavioral assays demonstrated that volatile organic compounds emitted by Klebsiella sp. induce a preference in oviposition decisions by Ae. aegypti. Bacterial headspace volatiles were sampled by solid-phase microextraction, and subsequent combined gas chromatography and electroantennogram detection analysis, revealed that the antennae of gravid females detect two compounds present in the Klebsiella sp. headspace. These compounds were identified by gas chromatography and mass spectrometry as 2-ethyl hexanol and 2,4-di‑tert-butylphenol. The binary blend of these compounds elicited a dose-dependent egg-laying preference by gravid mosquitoes. We propose that bacterial symbionts, which are associated with gravid mosquitoes and may be transferred to aquatic habitats during egg-laying, together with their volatiles act as oviposition cues indicating the suitability of active breeding sites to conspecific females.

Keywords

Klebsiella sp.; Bacterial volatiles; Olfaction; Chemical ecology; Oviposition

Published in

Acta Tropica

2023, volume: 237, article number: 106730

Authors' information

Mosquera, Katherine D.
René Rachou Institute
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Wondwosen, Betelehem
Addis Ababa University
Swedish University of Agricultural Sciences, Department of Biosystems and Technology
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Swedish University of Agricultural Sciences, Department of Plant Protection Biology
Lorenzo, Marcelo G.
René Rachou Institute

Associated SLU-program

SLU Future One Health

Sustainable Development Goals

SDG3 Good health and wellbeing

UKÄ Subject classification

Zoology
Microbiology
Ecology

Publication Identifiers

DOI: https://doi.org/10.1016/j.actatropica.2022.106730

URI (permanent link to this page)

https://res.slu.se/id/publ/119464