[UNKNOWN: PRESTIME] Introduction.

[UNKNOWN: PRESTIME] Schwinning, Susanne^*,1, Ehleringer, James², ¹ Biosphere 2 Center, Oracle, Arizona² Department of Biology, Salt Lake City, Utah Species interactions in desert communities: Dynamics of resource supply and utilization .

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[UNKNOWN: PRESTIME] Snyder, Season^*,1, Allen, Michael¹, Gosz, James², Pregitzer, Kurt³, ¹ Center for Conservation Biology, Riverside, CA² University of New Mexico, Albuquerque, NM³ Michigan Technological University, Houghton, MI Mycorrhizae and Nutrient Supply in Deserts.

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[UNKNOWN: PRESTIME] Stapp, Paul^*,1,2, Sanchez Pinero, Francisco³, ¹ University of California, Davis, CA² Harvey Mudd College, Claremont, CA³ University of Granada, Granada, Spain El Nino, marine subsidies, and food-web dynamics on desert islands in the Sea of Cortez.

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[UNKNOWN: PRESTIME] HUNTLY, NANCY^*,1, ¹ Idaho State University, Pocatello, ID Environmental variability and coexistence in desert plants: the storage effect.

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[UNKNOWN: PRESTIME] Break.

[UNKNOWN: PRESTIME] PRICE, MARY^*,1, MITTLER, JOHN², ¹ University of California, Riverside, CA² University of Washington, Seattle, WA Pulsed resource input, food storage, and coexistence of seed-eating desert rodents.

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[UNKNOWN: PRESTIME] HOLZAPFEL, CLAUS^*,1, MAHALL, BRUCE², ¹ Tel Aviv University, Tel Aviv, Israel² University of California, Santa Barbara, CA Positive and negative interactions among desert plants.

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[UNKNOWN: PRESTIME] Fleming, Theodore^*,1, ¹ University of Miami, Coral Gables, FL Interactions between columnar cacti and their migratory pollinators.

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[UNKNOWN: PRESTIME] BURQUEZ, ALBERTO^*,1, ¹ Instituto de Ecologia, Hermosillo, Sonora, México Buffel grass invasion on Sonoran Desert plant communities.

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[UNKNOWN: PRESTIME] BROWN, JOEL^*,1, ¹ University of Illinois at Chicago, Chicago, IL Indirect effects of trophic interactions: prey behavioral responses to the risk of predation.

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