1:30 PM Sherry, Rebecca^*,1, Wallace, Linda¹, Luo, Yiqi¹, Zehrbach, Nancy¹, ¹ University of Oklahoma, Norman, OK Phenological differences among winter annuals in warmed plots in tallgrass prairie.

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1:45 PM Summers, Heidi¹, Smith, Bruce¹, Hansen, Lee¹, ¹ Brigham Young University, Provo, UT Metabolic response to temperature in blackbrush (Coleogyne ramosissima).

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2:00 PM Thygerson, Tonya^*,1, Smith, Bruce¹, Hansen, Lee², Criddle, Richard², McCarlie, V.², ¹ BYU Dept Plant and Animal Science, Provo, UT² BYU Dept Chemistry and Biochemistry, Provo, UT Temperature and temperature variability in determining gradients in plant species range.

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2:15 PM Loveys, Beth¹, Williams, William^*,2, Edwards, Everard¹, Egerton, Jack¹, Pippen, Wayne¹, Loveys, Brian³, Ball, Marilyn¹, ¹ Research School of Biological Sciences, Canberra, ACT, Australia² St. Mary's College of Maryland, Saint Marys City, MD³ CSIRO Plant Industry, Adelaide, SA, Australia Nocturnal warming of Eucalyptus pauciflora.

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2:30 PM Pratt, R Brandon¹, Ewers, Frank², Lawson, Michael¹, Jacobsen, Anna¹, Davis, Stephen¹, ¹ Pepperdine University, Malibu, California² Michigan State University, East Lansing, Michigan Freezing limits the distribution of Malosma laurina in the chaparral of southern California.

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2:45 PM Loveys, Beth^{1, 2}, Egerton, John^{*,1, 2}, Pippen, Wayne^{1, 2}, Ball, Marilyn^{1, 2}, ¹ Australian National University, Canberra, ACT, Australia² CRC for Greenhouse Accounting, Canberra, ACT, Australia A mechanistic basis for lower freeze tolerance under elevated [CO₂].

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3:00 PM Break.

3:15 PM Rosenthal, David^*,1, Ludwig, Fulco¹, Stiller, Volker², Donovan, Lisa¹, ¹ University of Georgia, Athens, GA² University of Utah, Salt Lake City, UT Differences in plant and soil water relations and nutrient status on contrasting sides of a cold desert ecotone.

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3:30 PM Koechy, Martin^*,1, Tielboerger, Katja¹, ¹ Potsdam University, Potsdam, Brandenburg, Germany Rainfall distribution and persistence of populations of semi-desert annuals.

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3:45 PM Moody, Aaron^*,1, Meentemeyer, Ross², ¹ University of North Carolina at Chapel Hill, Chapel Hill, NC² Sonoma State University, Rohnert Park, CA Life history, xylem function, and drought stress interact to control spatial distributions of chaparral shrubs.

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4:00 PM Jacobsen, Anna^*,1, Davis, Stephen¹, Ewers, Frank², Kern, Kristine², Paddock, William², ¹ Pepperdine University, Malibu, California² Michigan State University, East Lansing, Michigan Tradeoffs among xylem efficiency, safety, and strength in twenty-two species of chaparral shrubs.

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