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dc.contributor.authorMorris, William F.
dc.contributor.authorHufbauer, Ruth A.
dc.contributor.authorAgrawal, Anurag A.
dc.contributor.authorBever, James D.
dc.contributor.authorBorowicz, Victoria A.
dc.contributor.authorGilbert, Gregory S.
dc.contributor.authorMaron, John L.
dc.contributor.authorMitchell, Charles E.
dc.contributor.authorParker, Ingrid M.
dc.contributor.authorPower, Alison G.
dc.contributor.authorTorchin, Mark E.
dc.contributor.authorVàzquez, Diego P.
dc.identifier.citationMorris, W. F., Hufbauer, R. A., Agrawal, A. A., Bever, J. D., Borowicz, V. A., Gilbert, G. S., Maron, J. L., Mitchell, C. E., Parker, I. M., Power, A. G., Torchin, M. E. and Vázquez, D. P. (2007), Direct and Interactive Effects of Enemies and Mutualists on Plant Performance: A Meta-Analysis, 88: 1021–1029. doi:10.1890/06-0442en_US
dc.description.abstractPlants engage in multiple, simultaneous interactions with other species; some (enemies) reduce and others (mutualists) enhance plant performance. Moreover, effects of different species may not be independent of one another; for example, enemies may compete, reducing their negative impact on a plant. The magnitudes of positive and negative effects, as well as the frequency of interactive effects and whether they tend to enhance or depress plant performance, have never been comprehensively assessed across the many published studies on plant–enemy and plant–mutualist interactions. We performed a meta-analysis of experiments in which two enemies, two mutualists, or an enemy and a mutualist were manipulated factorially. Specifically, we performed a factorial meta-analysis using the log response ratio. We found that the magnitude of (negative) enemy effects was greater than that of (positive) mutualist effects in isolation, but in the presence of other species, the two effects were of comparable magnitude. Hence studies evaluating single-species effects of mutualists may underestimate the true effects found in natural settings, where multiple interactions are the norm and indirect effects are possible. Enemies did not on average influence the effects on plant performance of other enemies, nor did mutualists influence the effects of mutualists. However, these averages mask significant and large, but positive or negative, interactions in individual studies. In contrast, mutualists ameliorated the negative effects of enemies in a manner that benefited plants; this overall effect was driven by interactions between pathogens and belowground mutualists (bacteria and mycorrhizal fungi). The high frequency of significant interactive effects suggests a widespread potential for diffuse rather than pairwise coevolutionary interactions between plants and their enemies and mutualists. Pollinators and mycorrhizal fungi enhanced plant performance more than did bacterial mutualists. In the greenhouse (but not the field), pathogens reduced plant performance more than did herbivores, pathogens were more damaging to herbaceous than to woody plants, and herbivores were more damaging to crop than to non-crop plants (suggesting evolutionary change in plants or herbivores following crop domestication). We discuss how observed differences in effect size might be confounded with methodological differences among studies.en_US
dc.publisherEcological Society of Americaen_US
dc.rightsCopyright by the Ecological Society of Americaen_US
dc.subjectFactorial experimenten_US
dc.subjectHedges' den_US
dc.subjectInteraction effecten_US
dc.subjectLog response ratioen_US
dc.subjectNatural enemyen_US
dc.subjectPlant performanceen_US
dc.titleDirect and Interactive Effects of Enemies and Mutualists on Plant Performance: A Meta-Analysisen_US
kusw.kuauthorBever, James D.
kusw.kudepartmentEcology & Evolutionary Biologyen_US
kusw.oanotesPer SHERPA/RoMEO 7/27/2016: Author's Pre-print: green tick author can archive pre-print (ie pre-refereeing) Author's Post-print: green tick author can archive post-print (ie final draft post-refereeing) Publisher's Version/PDF: green tick author can archive publisher's version/PDF General Conditions:

On author's personal website, employer's website, or institutional repository Publisher's version/PDF may be used Publisher copyright and source must be acknowledged (first page must state "Copyright by the Ecological Society of America," along with the full citation)
kusw.oaversionScholarly/refereed, publisher versionen_US
kusw.oapolicyThis item does not meet KU Open Access policy criteria.en_US

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