[UNKNOWN: PRESTIME] Powell, Mark^*,1, Andersen, Mark², Hope, Bruce³, ¹ US Department of Agriculture, Washington, DC² New Mexico State University, Las Cruces, NM³ Oregon Department of Environmental Quality, Portland, OR Risk assessment for invasive species: Introduction.

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[UNKNOWN: PRESTIME] Hoopes, Martha^*,1, ¹ University of California, Berkeley, CA Invasive species effects, cryptic stages, and lag times.

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[UNKNOWN: PRESTIME] Keitt, Timothy^*,1, ¹ State University of New York, Stony Brook, NY Dispersal as a Markov process and the distribution of first passage times through heterogeneous landscapes.

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[UNKNOWN: PRESTIME] Landis, Wayne^*,1, ¹ Western Washington University, Bellingham, WA Ecological risk assessment conceptual model formulation for non-indigenous species.

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[UNKNOWN: PRESTIME] Lodge, David^*,1, ¹ University of Notre Dame, Notre Dame, IN Using ecological models to forecast establishment, spread, and impact of nonindigenous species.

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[UNKNOWN: PRESTIME] Stohlgren, Thomas^*,1, Kalkhan, Mohammed², Barnett, David², Simonson, Sara², ¹ Midcontinent Ecological Science Center, U.S. Geological Survey, Fort Collins, CO² Natural Resource Ecology Laboratory, Colorado State University, Fort Collins, CO Beyond theory: lessons from natural landscapes.

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[UNKNOWN: PRESTIME] WITH, KIMBERLY^*,1, ¹ Kansas State University, Manhattan, KS, (kwith@ksu.edu) Assessing the risk of invasive spread in fragmented landscapes.

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[UNKNOWN: PRESTIME] Discussion.