Competitive outcome of multiple infections in a behavior-manipulating virus/wasp interaction

Ecology and Evolution
Julien MartinezJulien Varaldi

Abstract

Infections by multiple parasites are common in nature and may impact the evolution of host-parasite interactions. We investigated the existence of multiple infections involving the DNA virus LbFV and the Drosophila parasitoid Leptopilina boulardi. This vertically transmitted virus forces infected females to lay their eggs in already parasitized Drosophila larvae (a behavior called superparasitism), thus favoring its spread through horizontal transmission. Previous theoretical work indicated that the evolution of the level of the manipulation strongly depends on whether infected parasitoids can be re-infected or not. Here, we describe a strain of LbFV that differs from the reference strain by showing a deletion within the locus used for PCR detection. We used this polymorphism to test for the existence of multiple infections in this system. Viral strains did not differ on their vertical or horizontal transmission rates nor on the way they affect the parasitoid's phenotype, including their ability to manipulate behavior. Although already infected parasitoids were much less susceptible to new infection than uninfected ones, frequent coinfection was detected. However, following coinfection, competition between viral strains led to ...Continue Reading

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Citations

Feb 23, 2020·Molecular Biology and Evolution·Deborah Di GiovanniJulien Varaldi

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Datasets Mentioned

BETA
JX455824
FM876312

Methods Mentioned

BETA
PCR
electrophoresis

Software Mentioned

R package
Mondrian
R Core Team
R
R package lme4

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