Costs and benefits of omnivore-mediated plant protection: effects of plant-feeding on Salix growth more detrimental than expectedReport as inadecuate




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Oecologia

, Volume 184, Issue 2, pp 485–496

First Online: 16 May 2017Received: 17 September 2016Accepted: 28 April 2017DOI: 10.1007-s00442-017-3878-4

Cite this article as: Puentes, A. & Björkman, C. Oecologia 2017 184: 485. doi:10.1007-s00442-017-3878-4

Abstract

Predators can decrease herbivore damage to plants, and this is often assumed to be beneficial to plant growth-reproduction without actual quantification. Moreover, previous studies have been biased towards strict carnivores and neglected the role of omnivorous predators in prey-suppression. Here, we examined the costs reduction in growth and benefits increase in growth of enemy-mediated plant protection via the omnivorous prey and plant-feeding Orthotylus marginalis, relative to herbivory by a detrimental insect pest of Salix spp. plantations, the beetle Phratora vulgatissima. In a first experiment, we compared the cost of adult beetle versus omnivore nymph plant-feeding, and assessed the non- additive effects of the two types of damage. In a second experiment, we quantified the reduction in plant damage resulting from beetle-egg feeding by omnivorous nymphs and subsequent benefits to plants. We found that plant-feeding by omnivores negatively affected plant growth and this effect was similar to the cost imposed by beetle herbivory. Furthermore, simultaneous damage effects were additive and more detrimental than individual effects. While egg-predation by omnivore nymphs completely prevented beetle damage to plants, there was no difference in plant growth relative to only herbivore-damaged plants and growth was still reduced compared to control plants. Thus, despite herbivore suppression, there was no benefit to plant growth of omnivore-mediated plant protection and the negative effects of omnivore plant-feeding remained. These results are a first for an omnivorous enemy, and provide novel and timely insights on the underlying assumptions of tri-trophic associations and their use for biocontrol of insect pests.

KeywordsTri-trophic interactions Biological control Natural enemy Plant growth Herbivory Communicated by Ian Kaplan.

Electronic supplementary materialThe online version of this article doi:10.1007-s00442-017-3878-4 contains supplementary material, which is available to authorized users.





Author: Adriana Puentes - Christer Björkman

Source: https://link.springer.com/



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