Abstract
Tetranychus urticae (the two-spotted spider mite) is a phytophagous agricultural pest that affects many economically important crops. Two-spotted spider mites are group-living arachnids that produce silk webbing which is used for protection and dispersal, and also influences settlement behavior of conspecifics. We investigated the effects of conspecific silk and frass on microhabitat selection of these mites and whether these materials are substrates for semiochemicals. Two-choice behavioral assays gave mites the option of settling in the presence or absence of cues produced by conspecifics. Both sexes of mites preferred to settle in the presence of silk produced by conspecific females, and males also responded positively to silk produced by other males. Frass alone had no effect on mite settlement choices, but mites tended to prefer frass in combination with silk over silk alone. Female mites did not respond to conspecific silk after it was washed with methanol, and a crude methanol extract of the silk was sufficient to elicit settlement behavior, confirming that a semiochemical is responsible for the effect. We conclude that silk-bound semiochemicals provide cues used by both male and female mites when selecting a microhabitat, and that frass may also provide relevant social cues.
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Acknowledgements
We would like to acknowledge that this work was conducted in Mi’kma’ki, the ancestral and unceded territory of the Mi’kmaq. We thank T Peskett, S McCann, and all members of the INSECTA lab for assistance and support. This study was completed in partial fulfilment of the requirements for a Bachelor of Science with Honours in the Department of Biology at Acadia University.
Funding
This work was supported by NSERC (RGPIN-2017-04319 to NKH), Atlantic Canada Opportunities Agency Atlantic Innovation Fund (197853 to NKH), Eco Canada, Acadia University, and the K.C. Irving Environmental Science Centre.
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Conceptualization: GRB, CES, NKH; Data collection and analyses: GRB, CES; Visualization of data: CES; Writing – original draft: GRB; Writing – review and editing: GRB, CES, NKH; Funding acquisition and resources: NKH.
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We conducted this study in accordance with the guidelines of the Canadian Council on Animal Care (no protocol number because approval is not required for arthropods).
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Bowen-MacLean, G.R., Scott, C.E. & Hillier, N.K. Two-spotted Spider Mites Respond to Chemical Cues Associated with Conspecifics’ Silk When Choosing a Microhabitat. J Insect Behav 34, 271–279 (2021). https://doi.org/10.1007/s10905-021-09787-9
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DOI: https://doi.org/10.1007/s10905-021-09787-9