Host shifts in economically significant fruit flies (Diptera: Tephritidae) with high degree of polyphagy

He, Jiayao; Chen, Ke; Fan, Jun

doi:10.1002/ece3.8135

Cited by 1 publication

(2 citation statements)

References 55 publications

(75 reference statements)

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“…Infestations of other fruit families were also reported for Cucurbitaceae specialists from the Dacus genus 53,55 and for the Solanaceae specialist, N. cyanescens 19 . Secondly, phylogenetic analysis of host range diversity within the Dacini tribe revealed multiple episodes of host range switch, which involved broadening or reducing host range 13,56,57 . Since peripheral olfactory systems are generally conserved across Tephritidae 58 , oligophagous species might have a polyphagous-type olfactory system due to phylogenetic inertia.…”

Section: Discussionmentioning

confidence: 99%

“…There is little experimental data available because few studies have addressed this question. The family Tephritidae, a group of major pests, includes a substantial contingent of polyphagous species [12][13][14] . Some have an extremely wide host range, for example, more than 250 different host plants have been reported for the Oriental fruit fly Bactrocera dorsalis 15 .…”

Section: Introductionmentioning

confidence: 99%

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Olfaction in Tephritidae: a balance between detection and discrimination

Ramiaranjatovo,

Charlery de la Masselière,

Dekker

et al. 2024

Preprint

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Phytophagous insects are capable of detecting and locating suitable hosts, which emit volatile compounds. Polyphagous species appear to have a complex olfactory strategy given that their numerous hosts have diverse emission profiles. In particular, their hosts' volatile emissions share some of the same compounds, providing chemical bridges between them. However, the behavioural plasticity observed in insect host selection suggests that other volatiles have a complementary role. Here we explore how polyphagous insect specialization to detect and discriminate between hosts has driven their chemical selectivity. We predicted in silico a functional trade-off between these two functions, using a neuronal model of an olfactory system. The volatile emissions of intact or mechanically damaged fruit from 28 different species were fed into the model and analysed using gas chromatography coupled with mass spectrometry. Using triple point electroantennography and a behavioural assay, we studied the olfactory response of Tephritidae fruit fly species that oviposit on fruit. We observed experimentally two predictions of our model for host discriminating olfactory systems: the olfactory responses of eight species were negatively correlated with the compound's degree of sharedness among fruit emissions; female Bactrocera dorsalis showed a behavioural preference for non-shared over shared fruit compounds. A dose-dependent switch in the fly's preference confirmed the ecological importance of shared fruit compounds. Thus, we propose that insect olfactory systems are chemically tuned to detect suitable hosts and accurately discriminate between them.

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