Within-plant bottom-up effects mediate non-consumptive impacts of top-down control of soybean aphids

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dc.contributor.author Costamagna, Alejandro C.
dc.contributor.author McCornack, Brian P.
dc.contributor.author Ragsdale, David W.
dc.date.accessioned 2013-04-02T18:20:38Z
dc.date.available 2013-04-02T18:20:38Z
dc.date.issued 2013-04-02
dc.identifier.uri http://hdl.handle.net/2097/15445
dc.description Citation: Costamagna, A., McCornack, B., & Ragsdale, D. (2013). Within-Plant Bottom-Up Effects Mediate NonConsumptive Impacts of Top-Down Control of Soybean Aphids. PLoS ONE 8(2), e56394 - e56394. https://doi.org/10.1371/journal.pone.0056394
dc.description.abstract There is increasing evidence that top-down controls have strong non-consumptive effects on herbivore populations. However, little is known about how these non-consumptive effects relate to bottom-up influences. Using a series of field trials, we tested how changes in top-down and bottom-up controls at the within-plant scale interact to increase herbivore suppression. In the first experiment, we manipulated access of natural populations of predators (primarily lady beetles) to controlled numbers of A. glycines on upper (i.e. vigorous-growing) versus lower (i.e. slow-growing) soybean nodes and under contrasting plant ages. In a second experiment, we measured aphid dispersion in response to predation. Bottom-up and top-down controls had additive effects on A. glycines population growth. Plant age and within-plant quality had significant bottom-up effects on aphid size and population growth. However, top-down control was the dominant force suppressing aphid population growth, and completely counteracted bottom-up effects at the plant and within-plant scales. The intensity of predation was higher on upper than lower soybean nodes, and resulted in a non-consumptive reduction in aphid population growth because most of the surviving aphids were located on lower plant nodes, where rates of increase were reduced. No effects of predation on aphid dispersal among plants were detected, suggesting an absence of predator avoidance behavior by A. glycines. Our results revealed significant non-consumptive predator impacts on aphids due to the asymmetric intensity of predation at the within-plant scale, suggesting that low numbers of predators are highly effective at suppressing aphid populations. en_US
dc.language.iso en_US en_US
dc.relation.uri https://doi.org/10.1371/journal.pone.0056394 en_US
dc.rights © 2013 Costamagna et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
dc.rights.uri https://creativecommons.org/licenses/by/3.0/us/
dc.subject Top-down controls en_US
dc.subject Bottom-up controls en_US
dc.subject Soybean aphids en_US
dc.subject Pest control en_US
dc.title Within-plant bottom-up effects mediate non-consumptive impacts of top-down control of soybean aphids en_US
dc.type Article (publisher version) en_US
dc.date.published 2013 en_US
dc.citation.doi 10.1371/journal.pone.0056394 en_US
dc.citation.epage e56394-10 en_US
dc.citation.issn 1932-6203
dc.citation.issue 2 en_US
dc.citation.jtitle PLoS ONE en_US
dc.citation.spage e56394-1 en_US
dc.citation.volume 8 en_US
dc.citation Costamagna, A., McCornack, B., & Ragsdale, D. (2013). Within-Plant Bottom-Up Effects Mediate NonConsumptive Impacts of Top-Down Control of Soybean Aphids. PLoS ONE 8(2), e56394 - e56394. https://doi.org/10.1371/journal.pone.0056394
dc.contributor.authoreid mccornac en_US


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© 2013 Costamagna et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Except where otherwise noted, the use of this item is bound by the following: © 2013 Costamagna et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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