8:00 AM Posada, Juan^*,1, Mulkey, Stephen¹, Kitajima, Kaoru¹, ¹ University of Florida, Gainesville, Florida Distributions of leaf carbon gain in the crowns of three tropical tree species.

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8:15 AM Moore, David^*,1, Aref, Susanne¹, Finzi, Adrien², Hamilton, Jason³, Pippen, Jeffrey ⁴, Ho, Moon-ho¹, DeLucia, Evan¹, ¹ University of Illinois - Urbana-Champaign, Urbana, IL² Boston University, Boston, MA³ Ithaca College, Ithaca, NY⁴ Duke University, Durham, NC Inter-annual variation in the response of tree growth and productivity to exposure to elevated [CO₂].

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8:30 AM Kitajima, Kaoru^{*,1, 4}, Kikuzawa, Kihachiro², Ackerly, David³, Mulkey, Stephen¹, Wright, Joseph⁴, ¹ University of Florida, Gainesville, FL⁴ Smithsonian Tropical Research Institute, Balboa, Panama² Kyoto University, Kyoto, Japan³ Stanford University, Stanford, CA Leaf-age effect on photosynthetic rates as a key parameter in the theory of leaf longevity.

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8:45 AM LI, J. -H.^*,1, LINKE, R. B.², MADRITSCH, A. ², MEISTER, M. H. ², HINKLE, C. R. ³, DRAKE, B. G. ¹, ¹ Smithsonian Environmental Research Center, Edgewater, MD 21037, USA² University of Vienna, A-1090, Vienna, Austria³ Dynamac Corp., Kennedy Space Center, FL 32899, USA Photosynthetic acclimation of scrub-oaks to long-term elevated CO₂: A summary of seven years.

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9:00 AM Hamerlynck, Erik¹, Huxman, Travis², ¹ Department of Biological Sciences, Newark, NJ, USA² Department of Ecology and Evolutionary Biology, Tucson, AZ, USA Topography/canopy effects on the photochemical performance of jojoba, a broad-leaved Sonoran Desert evergreen shrub.

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9:15 AM Pippen, Jeffrey^*,1, Schlesinger, William¹, Wallenstein, Matthew¹, Klepeis, Debra ², Mahall, Bruce², ¹ Nicholas School of the Environment and Earth Sciences, Durham, NC, USA² Department of Ecology, Evolutionary and Marine Biology, Santa Barbara, CA, USA Community composition and photosynthetic rate of photoautotrophs under quartz pebbles in the southern Mojave Desert, California.

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9:30 AM Kim, Hyun-Seok^{1, 2}, Oren, Ram¹, Hinckley, Thomas², ¹ Duke University, Durham, NC, USA² University of Washington, Seattle, WA, USA Comparison between potential and actual net assimilation of hybrid poplar in eastern Washington.

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9:45 AM Break.

10:00 AM St.Clair, Samuel^*,1, Lynch, Jonathan ¹, ¹ Penn State University, University Park, PA, USA Photochemical responses of sugar maple and red maple seedlings to excess manganese in contrasting light environments.

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10:15 AM Teskey, Robert^*,1, McGuire, Mary Anne ¹, ¹ University of Georgia, Athens, GA A mass balance approach for calculating stem respiration in trees.

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10:30 AM Erickson, John^*,1, Kruger, Eric¹, Stanosz, Glen¹, ¹ University of Wisconsin-Madison, Madison, WI, USA Consequences of a fungal leaf spot on photosynthesis of two hybrid poplar cultivars.

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10:45 AM Manish, Chintamani^*,1, Peterjohn, William¹, ¹ West Virginia University, Morgantown, West Virginia Interactive effects of UV radiation and N availability on the growth of Quercus rubra seedlings.

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11:00 AM Germino, Matthew^*,1, Smith, William², Craig, Brodersen², Johnson, Dan², ¹ Idaho State University, Pocatello, ID² Wake Forest University, Winston-Salem, NC Photosynthetic variation in young and old conifers across an alpine-treeline ecotone.

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11:15 AM Duursma, Remko^*,1, Nippert, Jesse ², Marshall, John¹, ¹ University of Idaho, Moscow, ID, USA² Kansas State University, Manhattan, KS, USA Eight months of chlorophyll fluorescence measurements on six conifer species on an altitudinal gradient in northern Idaho.

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