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oai:www.ideals.illinois.edu:2142/30936 2023-07-10 col_2142_5131 col_2142_14737 com_2142_5130 com_2142_690 com_2142_397

Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-04-27T14:21:37Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 1 Rose_Scott.pdf: 4906203 bytes, checksum: 46d5ea0d9063538f6f680bfcd14d82d0 (MD5) Made available in DSpace on 2012-05-22T00:17:02Z (GMT). No. of bitstreams: 2 Rose_Scott.pdf: 4946495 bytes, checksum: 45441ebc8759ed45f1383f9ec6435566 (MD5) license.txt: 4058 bytes, checksum: 9cc09a7381163ea6de9ec5361585d323 (MD5) http://hdl.handle.net/2142/30936 en Copyright 2012 Scott Rose Alliaria petiolata garlic mustard Endress, Anton G. Rose, Scott 2012-05-22T00:17:02Z 2012-05-22T00:17:02Z 2012-05 2012-05-22T00:17:02Z 2012-05 Invasive species are the second leading threat to biodiversity in the U.S. and are considered the greatest threat to North American deciduous forest. Plant species richness is changing in many woodland communities as invasive species alter survival, fecundity, and regeneration of native species. Several hypotheses seek to explain the success of invasive species in their new range. The Novel Weapons hypothesis suggests invasive plants secrete allelopathic chemicals that are relatively ineffective against co-evolved neighbors in their native range, but deleteriously alter the fitness of neighboring plants in the novel range. For at least two decades, Alliaria petiolata (Bieb.) Cavara & Grande), a European biennial herb, has been a serious invader of natural areas and woodland communities of North America. Spatiotemporal changes within the herbaceous groundlayer and a microbial community assessment were analyzed in Collins Woods, a fragmented Illinois woodland. Across an eight-year interval, plant species richness increased despite A. petiolata becoming a dominant species within the community. Results of the microbial analyses were variable depending on invasion and spatial considerations. Native seed germination experiments indicate species-specific tolerance to changing soil characteristics may influence plant community structure. The total above-ground plant biomass differed significantly between plots with and without A. petiolata, but the above-ground biomass of native plant species was not affected by the presence of A. petiolata. The results of this study are partially consistent with a combination of direct and indirect allelopathic impacts of A. petiolata but other mechanisms may explain changes of native plant community in this small woodland. allelopathy novel weapons Invasion of Alliaria petiolata on a small fragmented central Illinois woodland: a test of the novel weapons hypothesis text Natural Res & Env Sci 1875 Natural Res & Env Sciences 0190 University of Illinois at Urbana-Champaign Thesis M.S. MS:Nat Res & Envrn Sci -UIUC 10KS0190MS