Wolbachia infection reduces blood-feeding success in the dengue fever mosquito, Aedes aegypti

Andrew P. Turley, Luciano A. Moreira, Scott L. O'Neill, Elizabeth A. McGraw

Research output: Contribution to journalArticlepeer-review

123 Scopus citations

Abstract

Background: The mosquito Aedes aegypti was recently transinfected with a life-shortening strain of the endosymbiont Wolbachia pipientis (wMelPop) as the first step in developing a biocontrol strategy for dengue virus transmission. In addition to life-shortening, the wMelPop-infected mosquitoes also exhibit increased daytime activity and metabolic rates. Here we sought to quantify the blood-feeding behaviour of Wolbachia-infected females as an indicator of any virulence or energetic drain associated with Wolbachia infection. Methodology/Principal Findings: In a series of blood-feeding trials in response to humans, we have shown that Wolbachia-infected mosquitoes do not differ in their response time to humans, but that as they age they obtain fewer and smaller blood meals than Wolbachia-uninfected controls. Lastly, we observed a behavioural characteristic in the Wolbachia infected mosquitoes best described as a "bendy" proboscis that may explain the decreased biting success. Conclusions/Significance: Taken together the evidence suggests that wMelPop infection may be causing tissue damage in a manner that intensifies with mosquito age and that leads to reduced blood-feeding success. These behavioural changes require further investigation with respect to a possible physiological mechanism and their role in vectorial capacity of the insect. The selective decrease of feeding success in older mosquitoes may act synergistically with other Wolbachiaassociated traits including life-shortening and viral protection in biocontrol strategies.

Original languageEnglish (US)
Article numbere516
JournalPLoS neglected tropical diseases
Volume3
Issue number9
DOIs
StatePublished - Sep 2009

All Science Journal Classification (ASJC) codes

  • Public Health, Environmental and Occupational Health
  • Infectious Diseases

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