Poster # 59. de Soyza, Amrita^*,1, Nowak, Robert¹, Knight, Eric², Babcock, Derek¹, Smith-Longozo, Vickie¹, ¹ University of Nevada - Reno, Reno, Nevada² University of Nevada - Las Vegas, Las Vegas, Nevada, Effects of elevated atmospheric CO2 on soil respiration in a Mojave Desert ecosystem.

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Poster # 60. Clark, Naomi^*,1, Phillips, Donald², Johnson, Mark², Tingey, David², Nowak, Robert¹, ¹ University of Nevada, Reno, Reno, NV, USA² U.S. Environmental Protection Agency, Corvallis, OR, USA, Effects of elevated CO2 on the fine root biomass of two Mojave Desert shrubs.

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Poster # 61. Jasoni, Richard^*,1, Smith, Stan², Arnone, John¹, ¹ Desert Research Institute, Reno, NV, USA² University of Nevada - Las Vegas, Las Vegas, NV, USA, Net ecosystem CO₂ exchange in Mojave Desert shrublands during the eighth year of exposure to elevated CO₂.

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Poster # 62. Armas, Cristina^*,1, Pugnaire, Francisco¹, ¹ Estación Experimental de Zonas Áridas, Almeria, Almeria, Spain, Plant interactions govern two co-dominant species population dynamics in a semiarid plant community.

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Poster # 63. Batchelor, Margaret^*,1, Fowler, Norma¹, ¹ University of Texas, Austin, TX, USA, Shade and soil water affect the balance between facilitation and competition.

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Poster # 64. Butterfield, Bradley^*,1, Briggs, John¹, ¹ Arizona State University, Tempe, Arizona, United States, Predicting population dynamics of nurse plant associations across Sonoran Desert landscapes.

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Poster # 65. Eilts, J. Alex Eilts^*,1, Huxman, Travis¹, Williams, David², Weltzin, Jake³, ¹ University of Arizona, Tucson, AZ² University of Wyoming, Laramie, WY³ University of Tennessee, Knoxville, TN, Differences in physiological response to water availability due to dissimilar root characteristics in two co-occurring grass species.

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Poster # 66. James, Jeremy ¹, Richards, James¹, ¹ Department of Land Air and Water Resources, Davis, CA, Seasonal timing of N pulses alters competitive interactions in a desert shrub plant community.

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Poster # 67. Mason, Michael^*,1, Weltzin, Jake², Potts, Daniel¹, English, Nathan¹, Huxman, Travis¹, Williams, David³, ¹ University of Arizona, Tucson, AZ² University of Tennessee, Knoxville, TN³ University of Wyoming, Laramie, WY, Survivorship of woody plant seedlings under altered precipitation regimes is facilitated by a non-native, invasive grass.

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Poster # 68. Miriti, Maria^*,1, ¹ The Ohio State University, Columbus, OH, Plant community dynamics: a spatially explicit perspective from the Colorado Desert.

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Poster # 69. Muldavin, Esteban^*,1, Moore, Douglas¹, Wetherill, Karen¹, Lightfoot, David¹, Collins, Scott¹, ¹ University of New Mexico, Albuquerque, NM, USA, Seasonal above-ground net primary production in black grama and blue grama grasslands, and creosotebush shrubland on the Sevilleta LTER, New Mexico: 1999-2004.

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Poster # 70. Naumburg, Elke^*,1, Hubbard, Paula², Martin, Dave², McLendon, Terry³, ¹ Pacifica Services Inc., Pasadena, CA² Los Angeles Department of Water and Power, Bishop, CA³ MWH, Fort Collins, CO, Successional Trends Following Cultivation in Owens Valley, California.

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Poster # 71. Patrick, Lisa^*,1, Robertson, Traesha¹, van Gestel, Natasja¹, Tissue, David¹, ¹ Texas Tech University, Lubbock, TX, USA, Response of net ecosystem carbon and water exchange to a large winter precipitation pulse in a sotol-grassland at Big Bend National Park, Texas.

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Poster # 72. Robertson, Traesha^*,1, van Gestel, Natasja¹, Patrick, Lisa¹, Zak, John¹, Loik, Micheal², Tissue, David¹, ¹ Texas Tech University, Lubbock² University of California - Santa Cruz, Santa Cruz, Aboveground annual net primary productivity and species composition response to variation in timing and magnitude of precipitation in Big Bend National Park, Texas.

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Poster # 73. Rodriguez-Buritica, Susana¹, Miriti, Maria¹, ¹ Department of Evolution, Ecology, and Organismal Biology, Columbus, OHIO, U.S.A, Interaction between the invasive grass Schismus barbatus (Poaceae) and the native perennial Ambrosia dumosa (Asteraceae) in the Colorado Desert, California.

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Poster # 74. Smith, Jeffrey^*,1, Bolton, Harvey², Bailey, Vanessa², ¹ USDA-ARS, Pullman, WA, USA² Pacific Northwest Laboratory, Richland, WA, USA, The effect of climate on plant and soil properties at different scales.

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Poster # 75. Wait, D. Alexander^*,1, Anderson, Wendy², ¹ Missouri State University, Springfield, MO, USA² Drury University, Springfield, MO, USA, Responding to temporal resource pulses in a spatially subsidized community: surprising strategies of desert annuals.

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