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Bacterial volatiles elicit differential olfactory responses in insect species from the same and different trophic levels

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Insect Science 2023年第5期30卷 1464-1480页

作者： Francine Antoinette Cornelus van Neerbos Peter Dewitte Felix Wäckers Tom Wenseleers Hans Jacquemyn Bart Lievens CMPG Laboratory for Process Microbial Ecology and Bioinspirational Management(PME&BIM) Department M2SKU LeuvenLeuvenBelgium Leuven Plant Institute(LPI) KU LeuvenLeuvenBelgium Laboratory of Socioecology and Social Evolution Biology DepartmentKU LeuvenLeuvenBelgium Biobest WesterloBelgium Lancaster Environment Centre Lancaster UniversityLancasterUK Laboratory of Plant Conservation and Population Biology Biology DepartmentKU LeuvenLeuvenBelgium

Insect communities consist of species from several trophic levels that have to forage for suitable resources among and within larger patches of nonresources.To locate their resources,insects use diverse stimuli,including olfactory,visual,acoustic,tactile and gustatory cues.While most research has focused on cues derived from plants and other insects,there is mounting evidence that insects also respond to volatile organic compounds(VOCs)emitted by microorganisms.However,to date little is known about how the olfactory response of insects within and across different trophic levels is affected by bacterial VOCs.In this study,we used Y-tube bioassays and chemical analysis of VOCs to assess how VOCs emitted by bacteria affect the olfactory response of insects of the same and different trophic levels.Experiments were performed using two aphid species(Amphorophora idaei Börner and Myzus persicae var.nicotianae Blackman),three primary parasitoid species(Aphidius colemani Viereck,A.ervi Haliday,and A.matricariae Viereck),and two hyperparasitoid species(Asaphes suspensus Nees and Dendrocerus aphidum Rondani).Olfactory responses were evaluated for three bacterial strains(Bacillus pumilus ST18.16/133,Curtobacterium sp.ST18.16/085,and Staphylococcus saprophyticus ST18.16/160)that were isolated from the habitat of the insects.Results revealed that insects from all trophic levels responded to bacterial volatiles,but olfactory responses varied between and within trophic levels.All bacteria produced the same set of volatile compounds,but often in different relative concentrations.For 11 of these volatiles we found contrasting correlations between their concentration and the behavior of the primary parasitoids and hyperparasitoids.Furthermore,olfactometer experiments on three of these compounds confirmed the contrasting olfactory responses of primary parasitoids and hyperparasitoids.The potential of these findings for the development of novel semiochemical-based strategies to improve biological aphid control has been discussed.

关键词： aphids behavioral response hyperparasitoids parasitoids trophic chain

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