Friday, August 8, 2008: 8:00 AM-11:30 AM
202 B, Midwest Airlines Center
OOS 24 - Biology of Weedy and Invasive Species in Agroecosystems: Case Studies
Plant invasion has emerged as a cross-disciplinary issue regularly involving ecologists and weed scientists. However, the diverse views that ecologists and weed scientists possess have led to different priorities and management strategies. Ecologists have tended to emphasize long-term system trends as modified by natural rather than human disturbances and management goals that often focus on structure, function, and biodiversity of ecosystems rather than economics or management of commodity production systems. By contrast, weed scientists have tended to emphasize short-term population trends as engineered by humans and management goals that focus on the production (i.e., yield) of rarified, highly controlled systems. Spawned by a number of recent symposia and workshops, a new approach to invasion biology has emerged that emphasizes ecological weed management. Such an approach recognizes the importance of fundamental ecological research that can be strategically tied to the management of both highly engineered and more natural systems. USDA’s extramural grant program, the Biology of Weedy and Invasive Species in Agroecosystems, has led the effort to combine weed science and ecology as a means of addressing the management of invasive species. Over its 17-year history, the program has supported more than 350 teams on funding of more than $50 million. The purpose of this session is to showcase the more recent projects supported by the program. Discussion will focus on: (1) how to integrate research, education, and extension to achieve management goals; and (2) how a portfolio of individual projects can collectively contribute to the long-term program goal of developing ecologically and economically rational strategies for weed management, control, and elimination.
Organizer:Michael Bowers, USDA
Moderator:Michael Bowers, USDA
8:00 AMInvasion dynamics of false brome (Brachypodium sylvaticum) in western North America
Alisa Ramakrishnan, Portland State University
8:20 AMEffects of patch-scale human disturbance on invasive species spread override hurrican-mediated landscape change
Gary N. Ervin, Mississippi State University, D.C. Holly, Mississippi State University, D.R. Shaw, Mississippi State University, J.M. Prince, Mississippi State University, J.D. Byrd, Mississippi State University, S.C. Grado, Mississippi State University, M.K. Measells, Mississippi State University, J.D. Madsen, Mississippi State University
8:40 AMSpotted knapweed and the mystery of the missing weapons of mass destruction
Ruth A. Hufbauer, Colorado State University, Amy C. Blair, Colorado State University, Scott J. Nissen, Colorado State University, Galen R. Brunk, Colorado State University, Philip Westra, Colorado State University, Bradley D. Hanson, USDA ARS
9:00 AMOptimal control of garlic mustard, a biennial weed with strong density dependence and limited dispersal
Eleanor A. Pardini, Washington University in St. Louis, John M. Drake, University of Georgia, Tiffany Knight, Washington University
9:20 AMHas garlic mustard evolved reduced allelopathic impacts on native plants?
Richard A. Lankau, Illinois Natural History Survey
9:40 AMBreak
9:50 AMRestoration of evolutionary fire-grazing interactions to limit invasion of exotic forages in the central grasslands
Samuel D. Fuhlendorf, Oklahoma State University
10:10 AMInvasibility of a grassland community by native and introduced genotypes of two invasive plant species (Centaurea maculosa Lam. and Senecio inaequidens D.C.)
Aurélie Thébault, Ecole Polytechnique Fédérale de Lausanne, François Gillet, Ecole Polytechnique Fédérale de Lausanne, Sandra Lavorel, Laboratoire d'Ecologie Alpine, Alexandre Buttler, Ecole Polytechnique Fédérale de Lausanne
10:30 AMMovement of herbicide resistance genes in seeds: Do ecological insights inform management?
David Mortensen, The Pennsylvania State University, Joseph Dauer, Oregon State University
10:50 AMCritical plant life-history trait linkage to weather, management, and clients
Frank Forcella, USDA, Greta Gramig, USDA, Kurt Spokas, USDA, Curt Bredeson, USDA
11:10 AMInteractive effects of climate and land management on weed distributions: The contribution of species distribution models
Curtis Daehler, University of Hawaii, Christoph Kueffer, University of Hawaii

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