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Potential for entomopathogenic nematodes in biological control: a meta-analytical synthesis and insights from trophic cascade theory

dc.contributor.authorDenno, Robert
dc.contributor.authorGruner, Daniel
dc.contributor.authorKaplan, Ian
dc.date.accessioned2008-10-30T14:43:42Z
dc.date.available2008-10-30T14:43:42Z
dc.date.issued2008
dc.identifier.urihttp://hdl.handle.net/1903/8656
dc.description.abstractEntomopathogenic nematodes (EPN) are ubiquitous and generalized consumers of insects in soil food webs, occurring widely in and agricultural ecosystems on all continents. Augmentative releases of EPN have been used to enhance biological control of pests in agroecosystems. Pest managers strive to achieve a trophic cascade whereby natural-enemy effects permeate down through the food web to suppress host herbivores and increase crop production. Although trophic cascades have been studied in diverse aboveground arthropod-based systems, they are infrequently investigated in soil systems. Moreover, no overall quantitative assessment of the effectiveness of EPN in suppressing hosts with cascading benefits to plants has been made. Toward synthesizing the available but limited information on EPN and their ability to suppress prey and affect plant yield, we surveyed the literature and performed a meta-analysis of 35 published studies. Our analysis found that effect sizes for arthropod hosts as a result of EPN addition were consistently negative and indirect effects on plants were consistently positive. Results held across several different host metrics (abundance, fecundity and survival) and across several measures of plant performance (biomass, growth, yield and survival). Moreover, the relationship between plant and host effect size was strikingly and significantly negative. That is, the positive impact on plant responses generally increased as the negative effect of EPN on hosts intensified, providing strong support for the mechanism of trophic cascades. We also review the ways in which EPN might interact antagonistically with each other and other predators and pathogens to adversely affect host suppression and dampen trophic cascades. We conclude that the food web implications of multiple-enemy interactions involving EPN are poorly studied, but, as management techniques that promote the long-term persistence of EPN are improved, antagonistic interactions are more likely to arise. We hope that the likely occurrence of antagonistic interactions in soil food webs should stimulate researchers to conduct field experiments explicitly designed to examine multiple-enemy interactions involving EPN and their cascading effects to hosts and plants.en
dc.format.extent1886606 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.subjectbiological controlen
dc.subjectcrop yielden
dc.subjectfood-web dynamicsen
dc.subjectentomopathogenic nematodesen
dc.subjectintraguild predationen
dc.subjectinterspecific competitionen
dc.subjectmultiple-enemy interactionsen
dc.subjectmeta-analysisen
dc.subjectpest suppressionen
dc.subjecttrophic cascadeen
dc.titlePotential for entomopathogenic nematodes in biological control: a meta-analytical synthesis and insights from trophic cascade theoryen
dc.typeArticleen
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_us
dc.relation.isAvailableAtEntomologyen_us
dc.relation.isAvailableAtCollege of Chemical & Life Sciencesen_us
dc.relation.isAvailableAtUniversity of Maryland (College Park, MD)en_us


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