Thesis (Ph.D.)--University of Texas at Dallas, 2007. / Includes vita. Includes bibliographical references (leaves 132-135)

Master of Science / Department of Biology / Martha E. Mather / Understanding the empirical relationships between biotic diversity and components of the environment is crucial for effective research and management, particularly in highly disturbed watersheds. The Smoky Hill River is a semi-arid prairie stream with a historic native fish community that is adapted to the extreme and highly variable climatic and hydrological conditions characteristic of the Great Plains streams. Following a literature review on environmental variables, diversity responses, and analysis methods, I evaluated the importance of land use, flow, discontinuities (dams, confluences), and stream type (mainstem-tributary) variables in explaining fish richness using AICc model selection with multiple linear, Poisson and negative-binomial regressions. I then compared these results from 48 sites across three watershed regions to those from a long-term monitoring dataset (ST) using the same candidate variables. Finally, I examined phylogenetic patterns of the fish community using ordination analyses. Patterns and drivers of biodiversity differed with watershed region, land use, stream type, and flow. Fish species richness in the Smoky Hill watershed was negatively correlated with percent developed land in the Lower region of the watershed, but positively correlated with percent herbaceous grassland, the reference prairie condition, in the Upper region of the watershed. Summer mean flow was consistently and positively related to species richness in the Middle and Upper regions of the watershed where flow was limited. In the Lower region of the watershed, species richness was higher in the more flow-moderate tributaries relative to high-flow mainstem sites. In the Middle and Upper flow-limited regions, species richness was lower in the low-flow tributaries than main stem sites. Families of fish species were also related to region and stream type (mainstem vs. tributary). A comparison of two databases showed how different goals, questions, and methods result in different insights, emphasizing the need for establishing a priori goals before sampling.

Master of Landscape Architecture / Department of Landscape Architecture/Regional and Community Planning / Melanie F. Klein / The trend of urbanization is escalating on a global scale, in many cases sprawling outward at the expense of decaying urban centers, post industrial infrastructure, and other neglected landscapes. There is a critical need for intelligent, responsive, and resilient urban planning and design. The Smoky Hill River’s neglected cutoff channel running through the heart of Salina, Kansas, is exemplary of these phenomena. Although the historic channel operates as an important landscape infrastructural system for stormwater conveyance, it remains largely inactive in terms of its connections to adjacent neighborhoods, cultural significance, and economic driving potential. Landscape Urbanism, a relatively new realignment in urbanism theory, involves the concept of engaging dynamic urban processes and facilitating or enhancing relationships through design, providing potential remediation to many urban dilemmas. While still speculative and experimental, its application in metropolitan environments has garnered acknowledgment in the design community. Landscape Urbanism’s relevance toward micropolitan and small metropolitan cities, however, remains largely unexplored. The relationship between the revitalization of the historic Smoky Hill cutoff and Salina, facilitated by local advocates the Friends of the River, explores the application of Landscape Urbanism theory in smaller urban environs. Through the analysis of precedents exhibiting Landscape Urbanism strategies, the careful inventory of characteristics unique to specific sites along the historic channel, and synthesizing the Friends of the River goals and objectives, applicable strategies that influence design methodology by engaging key urban systems are found and applied. The design of these sites act to “catalyze” adjacent areas through connectivity and enhancing the cultural, environmental, and economic health of the district. Design implementation at a strategic site catalyzes immediately adjacent districts, followed by the catalysis of the entire channel. In its final state, the historic channel becomes re-integrated into the City of Salina as a vital system, engaging and enhancing the urban field as a whole.