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Random amplified polymorphic DNA variation among remnant big bluestem (Andropogon gerardii Vitman) populations from Arkansas’ Grand Prairie
The results of this study indicated that small isolated remnant big bluestem populations were not genetically depauperate and that genetic relationships among populations could not be predicted solely on geographical proximity. Expand
Genetic Diversity and Competitive Abilities of Dalea purpurea (Fabaceae) from Remnant and Restored Grasslands
Allozyme and randomly amplified polymorphic DNA analyses were used to characterize the genetic relationships of Dalea purpurea from remnant and restored Illinoistallgrass prairies and a large remnant tallgrass prairie in Kansas, indicating that using multiple local seed sources for restoration projects will maintain the local gene pool while enhancing the regional genetic diversity of this species. Expand
Rising food costs & global food security: Key issues & relevance for India
  • D. J. Gustafson
  • Economics, Medicine
  • The Indian journal of medical research
  • 1 September 2013
The evidence of how rising costs have affected global food security since the food price crisis of 2007-2008 is reviewed, and their impact on different categories of households and countries are reviewed. Expand
Competitive relationships of Andropogon gerardii (Big Bluestem) from remnant and restored native populations and select cultivated varieties
It is established that seed provenance and restoration activities influence the competitive ability of a dominant species which, in turn, may affect plant community structure and potential ecosystem function. Expand
Conservation genetics of two co‐dominant grass species in an endangered grassland ecosystem
Research indicates that genetic diversity is much less of an issue in these perennial outcrossing autopolyploid grasses than genetic differences among local and non-local or cultivar seed sources, and suggests differences in plant performance as a function of the source population are more of a concern than genetic diversity. Expand
Is the serpentine aster, Symphyotrichum depauperatum (Fern.) Nesom, a valid species and actually endemic to eastern serpentine barrens?
This analysis supports the validity of S. depauperatum as a distinct species, which grows almost entirely on shallow soils overlying serpentinite bedrock in Pennsylvania and Maryland, but it confirms an earlier hypothesis that it includes small, disjunct populations on diabase glades in North Carolina. Expand
Using local seeds in prairie restoration--data support the paradigm
Genetic differences between local and non-local seed sources, that large populations do not necessarily have higher genetic diversity relative to small populations, and differences in plant performance could be related to seed source are found. Expand
Agricultural Extension: Worldwide Institutional Evolution and Forces for Change
Contributors. Acknowledgements. Introduction. I. ERA OF UNCERTAINTY AND CHANGE. 1. Agricultural Extension Worldwide: A Critical Turning Point (W.M. Rivera). 2. Reducing the Costs of Public ExtensionExpand
Eighteen years of herbaceous layer recovery of a recreation area in a mesic forest.
This study shows that with little active management or restoration, species diversity increased as exotic species abundance declined and mesic forest species increased, and suggests that given enough time after discontinuation of high impact recreational use, the vegetation will succeed to a community comparable with the surrounding flora. Expand