1:30 PM Von Holle, Betsy^*,1, Foster, David¹, Motzkin, Glenn, ¹ Harvard Forest, Harvard University, Petersham, MA Historic and current influences on habitat invasibility in a mosaic landscape: Cape Cod National Seashore.

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1:45 PM Newingham, Beth^*,1, Vivanco, Jorge², BassiriRad, Hormoz³, Good, William⁴, Callaway, Ragan⁴, ¹ US Geological Survey, Moab, UT, USA² Colorado State University, Fort Collins, CO, USA³ University of Illinois at Chicago, Chicago, IL, USA⁴ University of Montana, Missoula, MT, USA Root herbivory affects nitrogen uptake and secondary chemical production in the invasive plant, Centaurea maculsa.

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2:00 PM Miriti, Maria¹, ¹ The Ohio State University, Columbus, OH Responses of prairie natives and exotics to addition of soil nitrogen and calcium.

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2:15 PM Schaeffer, Sean^*,1, Ziegler, Susan¹, Belnap, Jayne², Evans, R.D.¹, ¹ University of Arkansas Stable Isotope Laboratory, Fayetteville, AR, USA² U.S. Geological Survey, Moab, UT, USA Alterations in soil microbial carbon and nitrogen cycling in an arid Colorado Plateau grassland with Bromus tectorum invasion.

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2:30 PM Thorpe, Andrea^*,1, Callaway, Ragan¹, ¹ University of Montana, Missoula, Montana, USA Interactions between the invasive forb, Centaurea maculosa, and soil nitrogen cycling.

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2:45 PM Break.

3:00 PM Allison, Steven^*,1, Vitousek, Peter¹, ¹ Stanford University, Stanford, CA, USA Decomposition and nutrient dynamics in native and exotic Hawaiian understory plant litter.

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3:15 PM Sanford, Robert^*,1, Belnap, Jayne², Gopalani, Sarah¹, Wojcik, Nathan¹, Richardson, Maxwell¹, ¹ University of Denver, Denver, CO² USGS - Biological Resources, Moab, UT Cheatgrass (Bromus tectorum L.) and seasonal patterns of soil phosphorus availability in arid ecosystems.

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3:30 PM Bray, Sarah¹, ¹ University of Florida, Gainesvillle, FL, 32611-8526 Microbial community function and composition over a range of geographical locations, plant communities and invasive plant species.

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3:45 PM Kinter, Cecilia^*,1, Mack, Richard¹, ¹ Washington State University, Pullman, WA Genetic sampling of emigrants affects plant height and vigor in new ranges.

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4:00 PM Erskine, Jennifer^*,1, ¹ Unviersity of California, Davis, Davis, CA, 95616 Genotype by environment effects on an invasive species, Foeniculum vulgare.

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4:15 PM DeWalt, Saara^*,1, Denslow, Julie², Hamrick, James³, ¹ Louisiana State University, Baton Rouge, LA² USDA Forest Service, Hilo, HI³ University of Georgia, Athens, GA Biomass allocation, growth, and photosynthesis of native and introduced genotypes of an invasive tropical shrub.

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4:30 PM Johnston, Jill^{*,1, 2}, Reagon, Michael¹, Snow, Allison¹, ¹ Department of Evolution, Ecology and Organismal Biology, Columbus, OH, USA² Department of Plant Biology, St. Paul, MN, USA Potential for gene flow from cultivated sorghum to shattercane (both Sorghum bicolor ssp. bicolor) in the midwestern U.S.

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