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Dynamics of a subterranean trophic cascade in space and time

dc.contributor.authorRam, Karthik
dc.contributor.authorGruner, Daniel
dc.contributor.authorMcLaughlin, John
dc.contributor.authorPreisser, Evan
dc.contributor.authorStrong, Donald
dc.description.abstractTrophic cascades, whereby predators indirectly benefit plant biomass by reducing herbivore pressure, form the mechanistic basis for classical biological control of pest insects. Entomopathogenic nematodes (EPN) are lethal to a variety of insect hosts with soil-dwelling stages, making them promising biocontrol agents. EPN biological control programs, however, typically fail because nematodes do not establish, persist and/or recycle over multiple host generations in the field. A variety of factors such as local abiotic conditions, host quantity and quality, and rates of movement affect the probability of persistence. Here, we review results from 13 years of study on the biology and ecology of an endemic population of Heterorhabditis marelatus (Rhabditida: Heterorhabditidae) in a California coastal prairie. In a highly seasonal abiotic environment with intrinsic variation in soils, vegetation structure, and host availability, natural populations of H. marelatus persisted at high incidence at some but not all sites within our study area. Through a set of field and lab experiments, we describe mechanisms and hypotheses to understand the persistence of H. marelatus. We suggest that further ecological study of naturally occurring EPN populations can yield significant insight to improve the practice and management of biological control of soil-dwelling insect pests.en
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dc.subjectentomopathogenic nematodesen
dc.subjectHepialus californicusen
dc.subjectHeterorhabditis californicusen
dc.subjectlong-term persistenceen
dc.subjectLupinus arboreusen
dc.subjectmetapopulation dynamicsen
dc.subjectbiological controlen
dc.subjecttrophic cascadeen
dc.titleDynamics of a subterranean trophic cascade in space and timeen
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_us
dc.relation.isAvailableAtCollege of Chemical & Life Sciencesen_us
dc.relation.isAvailableAtUniversity of Maryland (College Park, MD)en_us

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