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Parasitic wasps avoid ant-protected hemipteran hosts via detection of ant cuticular hydrocarbons

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URI
http://hdl.handle.net/20.500.11939/6929
DOI
10.1098/rspb.2020.1684
URL
https://royalsocietypublishing.org/doi/10.1098/rspb.2020.1684
Derechos de acceso
openAccess
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Author
Mouratidis, Angelos; Vacas, Sandra; Herrero-Schell, Julieta; Navarro-Llopis, Vicente; Marcel, Dicke; Tena, Alejandro
Date
2021
Cita bibliográfica
Mouratidis, A, Vacas, S, Herrero, J, Navarro-Llopis, V., Dicke, M. & Tena, A. (2021) Parasitic wasps avoid ant-protected hemipteran hosts via the detection of ant cuticular hydrocarbons. Proc. R. Soc. B 288: 20201684.
Abstract
One of the most studied and best-known mutualistic relationships between insects is that between ants and phloem-feeding insects. Ants feed on honeydew excreted by phloem-feeding insects and, in exchange, attack the phloem feeders’ natural enemies, including parasitic wasps. However, parasitic wasps are under selection to exploit information on hazards and avoid them. Here, we tested whether parasitic wasps detect the previous presence of ants attending colonies of phloem feeders. Behavioural assays demonstrate thatwasps left colonies previously attended by ants more frequently than control colonies. This behaviour has a potential cost for the parasitic wasp as females inserted their ovipositor in fewer hosts per colony. In a further bioassay, wasps spent less time on papers impregnated with extracts of the ant cues than on control papers. Gas chromatography coupled withmass spectrometry analyses demonstrated that ants left a blend of cuticular hydrocarbons when they attended colonies of phloem feeders. These cuticular hydrocarbons are deposited passively when ants search for food. Overall, these results suggest, for the first time, that parasitic wasps of honeydew producers detect the previous presence of mutualistic ants through contact infochemicals. We anticipate such interactions to be widespread and to have implications in numerous ecosystems, as phloem feeders are usually tended by ants.
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