Poster # 53. Bonnet, Veronique^*,1, Schoettle, Anna², Shepperd, Wayne², Hazlett, Donald³, ¹ Matcom at the Rocky Mountain Research Station, Fort Collins, CO² Rocky Mountain Research Station, Fort Collins, CO³ P.O. Box 345, Pierce, CO Changes in understory composition with silvicultural treatments - implications on competitive interactions with conifer regeneration.

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Poster # 54. HAAG, JOSHUA^*,1, COUPE, MALCOLM², CAHILL, JAMES², ¹ UNIVERSITY OF TORONTO, TORONTO, ONTARIO, CANADA² UNIVERSITY OF ALBERTA, EDMONTON, ALBERTA, CANADA Interactive effects between competition and herbivory on the growth of four native species in a Rough Fescue grassland.

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Poster # 55. Aguilar, Deborah^*,1, Romagni, Joanne¹, ¹ University of St. Thomas, Houston, TX Mechanism of action and ecophysiological role of a lichen anthraquinone analogue.

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Poster # 56. Hartle, R. Todd^*,1, Nowak, Robert¹, ¹ University of Nevada, Reno, Reno, NV A field study of plant territory defense in Mojave Desert shrubs.

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Poster # 57. Horton, Jonathan^*,1, Nilsen, Erik¹, Beier, Colin¹, Walker, John¹, Miller, Orson¹, Clinton, Barton², ¹ Biology Department, Blacksburg, VA² USDA Forest Service Southern Research Station, Otto, NC Photosynthetic responses of oak seedlings growing along a gradient of evergreen understory shrub density.

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Poster # 58. Batchelor, Margaret^*,1, Fowler, Norma¹, McNally, Michelle¹, ¹ University of Texas, Austin, TX Spatial association between two woody plants in a savanna system:evidence for facilitation?

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