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Type: Artigo
Title: Plant defences limit herbivore population growth by changing predator–prey interactions
Author: Kersch-Becker, Mônica F.
Kessler, André
Thaler, Jennifer S.
Abstract: Plant quality and predators are important factors affecting herbivore population growth, but how they interact to regulate herbivore populations is not well understood. We manipulated jasmonate-induced plant resistance, exposure to the natural predator community and herbivore density to test how these factors jointly and independently affect herbivore population growth. On low-resistance plants, the predator community was diverse and abundant, promoting high predator consumption rates. On high-resistance plants, the predator community was less diverse and abundant, resulting in low predator consumption rate. Plant resistance only directly regulated aphid population growth on predator-excluded plants. When predators were present, plant resistance indirectly regulated herbivore population growth by changing the impact of predators on the herbivorous prey. A possible mechanism for the interaction between plant resistance and predation is that methyl salicylate, a herbivore-induced plant volatile attractive to predators, was more strongly induced in low-resistance plants. Increased plant resistance reduced predator attractant lures, preventing predators from locating their prey. Low-resistance plants may regulate herbivore populations via predators by providing reliable information on prey availability and increasing the effectiveness of predators
Subject: Plantas
Country: Reino Unido
Editor: The Royal Society Publishing
Rights: Fechado
Identifier DOI: 10.1098/rspb.2017.1120
Date Issue: 2017
Appears in Collections:IB - Artigos e Outros Documentos

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