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Title: Herbivore-Mediated Interaction Promotes the Maintenance of Trichome Dimorphism through Negative Frequency-Dependent Selection
Authors: Sato, Yasuhiro
Kudoh, Hiroshi
Author's alias: 佐藤, 安弘
工藤, 洋
Keywords: Arabidopsis halleri
apparent competition
frequency dependence
genetic variation
herbivory
plant defense
Issue Date: Sep-2017
Publisher: University of Chicago Press
Journal title: The American Naturalist
Volume: 190
Issue: 3
Start page: E68
End page: E77
Abstract: Natural plant populations exhibit genetic variation in defense traits against herbivores. Despite a growing body of evidence for herbivore-mediated selection on plant defenses, we still know little about how genetic variation persists in antiherbivore defense traits. Here we present field and experimental evidence for herbivore-mediated frequency-dependent selection that promotes the maintenance of trichome-producing (hairy) and trichomeless (glabrous) plants of Arabidopsis halleri subsp. gemmifera. First, in a natural population where the specialist leaf beetle Phaedon brassicae was prevalent, hairy plants were damaged less when the frequency of neighboring glabrous plants increased. Furthermore, temporal variation in the frequency of the two plant morphs showed that rarer morphs increased in frequency at the scale of 1-m-diameter patches between survey years. Using a mesocosm experiment, we demonstrated a rare-morph advantage for defense (leaf damage and herbivore abundance) and reproduction (flower and clone production) between hairy and glabrous plants in the presence of P. brassicae. However, this rare-morph advantage was not detected when beetles were absent, with glabrous plants having higher reproduction than hairy plants under these conditions regardless of frequency conditions. These findings highlight the overlooked but potentially critical role of herbivore-mediated apparent interaction in maintaining plant defense polymorphism.
Rights: © 2017 by The University of Chicago.
The full-text file will be made open to the public on 01 September 2018 in accordance with publisher's 'Terms and Conditions for Self-Archiving'.
URI: http://hdl.handle.net/2433/226924
DOI(Published Version): 10.1086/692603
PubMed ID: 28829638
Appears in Collections:Journal Articles

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