1:30 PM Gelbard, Jonathan^*,1, Harrison, Susan², ¹ Dept of Environmental Science and Policy, Davis, CA, USA² Dept of Environmental Science and Policy, Davis, CA, USA Landscape structure, biotic resistance, and invasional meltdown: An experimental study of yellow starthistle.

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1:50 PM Lortie, Christopher^*,1, Hierro, Jose², Villarreal, Diego³, ¹ University of Nevada Reno, Reno, Nevada² University of Montana, Missoula, Montana³ Universidad Nacional de La Pampa, Santa Rose, La Pampa, Argentina Seed and seedbank dynamics of the highly invasive weed Yellow starthistle.

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2:10 PM Hierro, José¹, Villarreal, Diego², Callaway, Ragan¹, ¹ The University of Montana, Missoula, Montana² Universidad Nacional de La Pampa, Santa Rosa, La Pampa, Argentina A biogeographical comparison of the invasion success of Centaurea solstitialis between California and central Argentina.

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2:30 PM Bradford, John^{1, 2}, Lauenroth, William^{1, 3}, ¹ Dept. of Forest, Range and Watershed Stewardship, Fort Collins, CO, USA² Graduate Degree Program in Ecology, Fort Collins, CO, USA³ Natural Resource Ecology Laboratory, Fort Collins, CO, 80521 Controls over cheatgrass invasion: The importance of climate, soil, disturbance and seed availability.

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2:50 PM Mayer, Kara^{*,1, 2}, Pyke, David^{1, 2}, ¹ Oregon State University, Corvallis, OR² U.S.G.S. Forest and Rangeland Ecosystem Science Center, Corvallis, OR Effect of defoliation on seed production of Bromus tectorum.

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3:10 PM Break.

3:20 PM Newingham, Beth^{*,1, 3}, Sanford, Robert², Belnap, Jayne¹, ¹ US Geological Survey, Moab, UT, USA³ Department of Biological Sciences, Las Vegas, NV, USA² Department of Biological Sciences, Denver, CO, USA Burning soil alters soil chemistry and subsequently affects the invasive annual grass, Bromus tectorum.

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3:40 PM Hogel, Adrian^*,1, Sanford, Robert¹, ¹ University of Denver, Denver, CO Allelopathy and root exudates of cheatgrass (Bromus tectorum).

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4:00 PM HAUBENSAK, KAREN^*,1, D'ANTONIO, CARLA¹, EMBRY, SAUNDRA¹, ¹ USDA-AGRICULTURAL RESEARCH SERVICE, RENO, NEVADA, USA Some evidence for local adaptation in cheatgrass populations invading salt desert habitat in Nevada.

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4:20 PM Embry, Saundra^*,1, D'Antonio, C.^{1, 2}, Haubensak, K.², ¹ University of Nevada, Reno, NV, USA² USDA-Agricultural Research Station, Reno, NV, USA Patterns of mycorrhizal colonization and plant growth in cheatgrass invasion of salt desert versus sagebrush soils.

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4:40 PM Chambers, Jeanne^*,1, Blank, Robert², Roundy, Bruce³, Meyer, Susan⁴, Whittaker, Alison⁵, ¹ USDA Forest Service, Reno, NV, chambers@equinox.unr.edu² USDA ARS, Reno, NV³ Brigham Young University, Provo, UT⁴ USDA Forest Service, Provo, UT⁵ Utah Division of Wildlife Resources, Ephraim, UT Invasibility of sagebrush communities by cheatgrass (Bromus tectorum): Effects of native herbaceous species and fire.

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