Tuesday, August 7, 2007: 1:30 PM-5:00 PM
B3&4, San Jose McEnery Convention Center
OOS 16 - Root herbivores as agents of change: Micro- and macro-herbivores across natural and managed systems
Root herbivores play a major but often underappreciated role in many ecosystems. The root herbivore fauna is diverse, including culturally familiar groups such as “June” beetles, “click” beetles and pocket gophers, but also lesser-known groups such as nematodes, flies and weevils. This session will highlight integrative ecological research involving root herbivores, examining the roles of root herbivores in food webs and the influence of root herbivory on ecosystem structure and function. Speakers will explore the role of root herbivores as consumer and prey in multi-trophic food webs; linkages between root herbivores, induced plant defenses, and aboveground fauna; the emergence and biological control of invasive root-feeding pests in managed ecosystems; and the influence of social change on root herbivory in traditional agricultural communities. The session explores three major themes: change, micro- and macrofauna, and natural and managed systems. Change will be examined explicitly across multiple temporal scales from seasonal variation, to inter-annual changes resulting from factors such as the El Niño Southern Oscillation, to longer-term changes that result from invasive pests and sociological change. Speakers will present research on fauna including nematodes, insects, and mammals, and ecosystems ranging from some of the most intensively managed agricultural systems on the planet, to more traditional agricultural systems, to low-input systems, to largely unmanaged ecosystems.
Organizer:Glen N. Stevens, University of California, Davis
Co-organizer:David R. Coyle, University of Wisconsin, Madison
Moderator:Glen N. Stevens, University of California, Davis
1:30 PMThe interaction between root herbivory by rodents and plant communities
O. J. Reichman, National Center for Ecological Analysis and Synthesis
1:50 PMGrazing in the dark: The chemical ecology of root-feeding insects
Scott N. Johnson, Scottish Crop Research Institute
2:10 PMHerbivore-induced defenses in above- and belowground plant tissues
Ian Kaplan, University of Maryland, Rayko Halitschke, Cornell University, Andre Kessler, Cornell University, Sandra Sardanelli, University of Maryland, Robert F. Denno, University of Maryland
2:30 PMSoil suppressiveness against soil-borne disease complexes including plant-parasitic nematodes
Andreas Westphal, Purdue University, Lijuan Xing, Purdue University, Alison Seyb, Purdue University, Tony Vyn, Purdue University
2:50 PMBelowground tri-trophic signaling between maize roots and entomopathogenic nematodes
Ted C. J. Turlings, University of Neuchâtel, Ivan Hiltpold, University of Neuchâtel, Sergio Rasmann, University of Neuchâtel
3:10 PMBreak
3:20 PMInsect parasites and plant parasitic nematode antagonists: What are entomopathogenic nematodes doing down there?
Edwin E. Lewis, University of California, Davis, Glen N Stevens, University of California, Davis
3:40 PMEcology and impact of invasive root weevils in a northern hardwood forest
David R. Coyle, University of Wisconsin, Madison, Kenneth F. Raffa, University of Wisconsin, Madison, Alexander L. Friend, USDA Forest Service, William J. Mattson Jr., USDA Forest Service
4:00 PMImpacts of periodical cicadas on forest communities through host selection and growth responses
Angela L. Shelton, Indiana University, Keith Clay, Indiana University
4:20 PMSocial change and indigenous pest outbreak in the Andes
Soroush Parsa, University of California, Davis
4:40 PMLepidopteran root-feeders as agents of change in California coastal landscapes
Daniel S. Gruner, University of California-Davis, Evan Preisser, University of Rhode Island, Karthik Ram, University of California-Davis, John P. McLaughlin, University of California-Davis, Donald R. Strong, University of California-Davis

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