Poster # 9. REYES, MELISSA^*,1, JOHNSON, NANCY¹, WOLF, JULIE¹, ¹ Northern Arizona University, Flagstaff, AZ Effects of CO₂ enrichment on mycorrhizal responsiveness of tallgrass prairie species: an inverse relationship.

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Poster # 10. Sudderth, Erika^*,1, Bazzaz, F¹, ¹ Harvard University, Cambridge, MA The effects of elevated carbon dioxide and nitrogen availability on plant and insect herbivore performance.

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Poster # 11. KNEPP, RACHEL^*,1, HAMILTON, JASON², DELUCIA, EVAN¹, ¹ University of Illinois, Urbana, Illinois² Ithaca College, Ithaca, New York Plant-insect interactions in a forest community exposed to free-air CO₂ enrichment.

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Poster # 12. Wang, Xianzhong^*,1, Griffin, Kevin², ¹ Indiana University-Purdue University Indianapolis, Indianapolis, IN² Lamont-Doherty Earth Observatory, Palisades, NY Sex-specific physiological and growth responses to elevated atmospheric CO₂ in Silene latifolia Poiret .

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Poster # 13. HERRICK, JEFFREY^*,1, THOMAS, RICHARD¹, ¹ West Virginia University, Morgantown, West Virginia Effects of leaf age on the photosynthetic capacity of sweetgum after 5 years CO₂ enrichment.

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Poster # 14. Nesbit, April^*,1, Sholtis, Johnna¹, Tissue, David¹, ¹ Texas Tech University, Lubbock, TX Variations in sweetgum tree (Liquidambar styraciflua L) leaf ultrastructure after exposure to elevated CO₂.

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Poster # 15. BARRON-GAFFORD, GREG^*,1, GRIEVE, KATIE¹, PAIGE, TERENCE¹, PATTERSON, LANE¹, MURTHY, RAMESH^1,2, GRIFFIN, KEVIN², ¹ Biosphere 2 Center, Oracle, AZ² Lamont-Doherty Earth Obervatory, Palisades, NY Influence of elevated CO₂ on carbon storage, water use, and gas exchange of Eastern cottonwoods.

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Poster # 16. Sefcik, Lesley^*,1, Ellsworth, David¹, ¹ University of Michigan, Ann Arbor, MI Effects of elevated CO ₂ and shade on growth and physiology in five northern tree species.

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Poster # 17. Kubiske, Mark^*,1, McDonald, Evan¹, ¹ USDA Forest Service, Rhinelander, WI Photosynthetic carbon isotope discrimination in tree canopies under CO₂ and O₃ enrichment.

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Poster # 18. Osuna, Miguel^*,1, Vavrek, Milan¹, Campbell, William¹, ¹ Louisiana Tech University, Ruston, LA Effects of elevated CO₂ and competition on loblolly pine seedlings.

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Poster # 19. Kline, Kerry^*,1, BassiriRad, Hormoz¹, ¹ University of Illinois at Chicago, Chicago, IL Interspecific variation in CO₂ effects on seed quality, germination rate and early seedling physiology.

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