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Title: Optimal foraging by herbivores maintains polymorphism in defence in a natural plant population
Authors: Sato, Yasuhiro
Ito, Koichi
Kudoh, Hiroshi  kyouindb  KAKEN_id
Author's alias: 佐藤, 安弘
伊藤, 公一
工藤, 洋
Keywords: Arabidopsis halleri subsp. gemmifera
associational effects
genetic variation
optimal diet choice
plant defence
Issue Date: Dec-2017
Publisher: Wiley-Blackwell
Journal title: Functional Ecology
Volume: 31
Issue: 12
Start page: 2233
End page: 2243
Abstract: 1. Many species of plants and animals exhibit polymorphism for defensive traits. Adaptive foraging by natural enemies has long been hypothesized to maintain such polymorphism, but this has not been clearly demonstrated in a natural prey or host population. 2. The purpose of this study was to address whether the brassica leaf beetle Phaedon brassicae promotes the maintenance of defence polymorphism in the trichome-producing (hairy) and trichomeless (glabrous) morphs of Arabidopsis halleri subsp. gemmifera. Here, we modelled foraging behaviours of herbivores and demography of the host plant. Then, we estimated the model parameters based on the likelihood of observed data from a natural A. halleri population. 3.The patterns of leaf damage to hairy and glabrous plants were well explained when we presumed the optimal diet choice (ODC) by P. brassicae. The observed dynamics in the plant number and morph-frequency were well supported by the model with the estimated parameter values. Our numerical analysis showed that the ODC by P. brassicae caused a negative frequency-dependent selection on trichrome dimorphism. The coexistence of two morphs was allowed over a wide range of herbivory pressure and the cost of defence. 4. These results indicate that the ODC by P. brassicae contributes to the coexistence of hairy and glabrous A. halleri. While species interaction and stochastic dispersal are both involved in polymorphism dynamics in the field, our findings suggest that the role of consumer behaviours in the maintenance of defence polymorphism may be more important than currently appreciated.
Rights: This is the accepted version of the following article: [Sato Y, Ito K, Kudoh H. Optimal foraging by herbivores maintains polymorphism in defence in a natural plant population. Funct Ecol. 2017;31:2233–2243], which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
The full-text file will be made open to the public on 1 DEC 2018 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
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): 10.1111/1365-2435.12937
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