Joan L. Walker

Learn More
  • Joseph W Veldman, Lars A Brudvig, Ellen I Damschen, John L Orrock, W Brett Mattingly, Joan L Walker +2 others
  • 2014
Question: Human-altered disturbance regimes and agricultural land uses are broadly associated with reduced plant species diversity in terrestrial ecosystems. In this study, we seek to understand how fire frequency and agricultural land-use history influence savanna understorey plant diversity through complex relationships (i.e. indirect effects) among(More)
  • Lars A. Brudvig, John L. Orrock, Ellen I. Damschen, Cathy D. Collins, Philip G. Hahn, W. Brett Mattingly +2 others
  • 2014
Ecological restoration is frequently guided by reference conditions describing a successfully restored ecosystem; however, the causes and magnitude of ecosystem degradation vary, making simple knowledge of reference conditions insufficient for prioritizing and guiding restoration. Ecological reference models provide further guidance by quantifying reference(More)
  • W. Brett Mattingly, John L. Orrock, Cathy D. Collins, Lars A. Brudvig, Ellen I. Damschen, Joseph W. Veldman +1 other
  • 2014
Land-use legacies are known to shape the diversity and distribution of plant communities, but we lack an understanding of whether historical land use influences community responses to contemporary disturbances. Because human-modified landscapes often bear a history of multiple land-use activities, this contingency can challenge our understanding of land-use(More)
To address issues of climate change, people are more and more being presented with the greenhouse gas emissions associated with their alternatives. Statements of pounds or kilograms of CO 2 are showing up in trip planners, car advertisements, and even restaurant menus under the assumption that this information influences behavior. This research contributes(More)
OBJECTIVE Cervical intraepithelial neoplasia grade 3 (CIN3), the immediate cervical cancer precursor, is a target of cervical cancer prevention. However, less than half of CIN3s will progress to cancer. Routine treatment of all CIN3s and the majority of CIN2s may lead to overtreatment of many lesions that would not progress. To improve our understanding of(More)
1 While congestion charging has been heavily studied, relatively little literature focus on incentives and 2 none is comparing different incentivization schemes. This paper investigates the impact of providing 3 incentives on travelers' choices for their commute to work. In contrast to road pricing, an approach of 4 offering incentives to decongest is(More)