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Title: Oviposition-site shift in phytophagous mites reflects a trade-off between predator avoidance and rainstorm resistance
Authors: Okada, Serena
Yano, Shuichi
Author's alias: 岡田, 瀬礼奈
矢野, 修一
Keywords: non-consumptive effect
oviposition site shift
Tetranychus kanzawai
wind and rain
synergistic effect
Issue Date: Mar-2021
Publisher: Royal Society
Journal title: Biology Letters
Volume: 17
Issue: 3
Thesis number: 20200669
Abstract: Predators can reduce prey population densities by driving them to undertake costly defences. Here, we report on a remarkable example of induced antipredator defence in spider mites that enhances the risk to rainstorms. Spider mites live on the undersides of host plant leaves and usually oviposit on the leaf undersurface. When they are threatened by predatory mites, they oviposit on three-dimensional webs to avoid egg predation, although the cost of ovipositing on webs has not yet been clearly determined. We prepared bean plants harbouring spider mite (Tetranychus kanzawai) eggs on either leaf surfaces or webs and exposed them to rainstorms outdoors. We found that fewer eggs remained on webs than on leaf surfaces. We then examined the synergistic effect of wind and rain by simulating both in the laboratory. We conclude that ovipositing on webs comes at a cost, as eggs are washed off the host plants by wind and rain. This may explain why spider mite populations decrease drastically in the rainy season, although they inhibit leaf undersides where they are not directly exposed to rainfall.
Description: 捕食者と風雨に対する害虫のジレンマを発見 --捕食者は捕食するより大きな抑止力を及ぼす--. 京都大学プレスリリース. 2021-03-04.
Rights: This is an accepted manuscript of the article, which has been published in final form at
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
DOI(Published Version): 10.1098/rsbl.2020.0669
PubMed ID: 33653092
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