Matching Items (3)
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- All Subjects: decision making
- Creators: Mcintyre, Lisa
Description
Over the past century in the southwestern United States human actions have altered hydrological processes that shape riparian ecosystems. One change, release of treated wastewater into waterways, has created perennial base flows and increased nutrient availability in ephemeral or intermittent channels. While there are benefits to utilizing treated wastewater for environmental flows, there are numerous unresolved ecohydrological issues regarding the efficacy of effluent to sustain groundwater-dependent riparian ecosystems. This research examined how nutrient-rich effluent, released into waterways with varying depths to groundwater, influences riparian plant community development. Statewide analysis of spatial and temporal patterns of effluent generation and release revealed that hydrogeomorphic setting significantly influences downstream riparian response. Approximately 70% of effluent released is into deep groundwater systems, which produced the lowest riparian development. A greenhouse study assessed how varying concentrations of nitrogen and phosphorus, emulating levels in effluent, influenced plant community response. With increasing nitrogen concentrations, vegetation emerging from riparian seed banks had greater biomass, reduced species richness, and greater abundance of nitrophilic species. The effluent-dominated Santa Cruz River in southern Arizona, with a shallow groundwater upper reach and deep groundwater lower reach, served as a study river while the San Pedro River provided a control. Analysis revealed that woody species richness and composition were similar between the two systems. Hydric pioneers (Populus fremontii, Salix gooddingii) were dominant at perennial sites on both rivers. Nitrophilic species (Conium maculatum, Polygonum lapathifolium) dominated herbaceous plant communities and plant heights were greatest in effluent-dominated reaches. Riparian vegetation declined with increasing downstream distance in the upper Santa Cruz, while patterns in the lower Santa Cruz were confounded by additional downstream agricultural input and a channelized floodplain. There were distinct longitudinal and lateral shifts toward more xeric species with increasing downstream distance and increasing lateral distance from the low-flow channel. Patterns in the upper and lower Santa Cruz reaches indicate that water availability drives riparian vegetation outcomes below treatment facilities. Ultimately, this research informs decision processes and increases adaptive capacity for water resources policy and management through the integration of ecological data in decision frameworks regarding the release of effluent for environmental flows.
ContributorsWhite, Margaret Susan (Author) / Stromberg, Juliet C. (Thesis advisor) / Fisher, Stuart G. (Committee member) / White, Dave (Committee member) / Holway, James (Committee member) / Wu, Jianguo (Committee member) / Arizona State University (Publisher)
Created2011
Description
This study provides an understanding of how administrative leaders make decisions regarding enrollment management within academic units at a major research university in the southwestern United States. Key enrollment management functions of recruiting, admissions, marketing, orientation, financial aid/scholarships, academic advising, student engagement, retention and career services were identified from the literature. Typically applied at the institutional level, this study provides an understanding of how leaders in academic units decide to implement enrollment management. A case study was conducted using qualitative data collection methods which emphasized interviews. Senior administrators, such as associate deans within academic units who have responsibility for enrollment management, served as the sample. Three main theoretical constructs were derived after analysis of the data: Theoretical Construct 1: To meet enrollment and retention goals, leaders strategically plan structures and manage resources for enrollment management functions in their academic units. Theoretical Construct 2: To increase retention, leaders intentionally strive to develop a sense of community through customized programs and services for students in their academic units. Theoretical Construct 3: To achieve enrollment objectives within a school-centric model, leaders build relationships with centralized enrollment management functions and other academic units. The discussion and analysis of the study suggests that academic units follow a similar evolutionary model to institutions as they develop enrollment management functions. Five recommendations on how leaders in academic units can more strategically utilize enrollment management principles in decision making are offered.
ContributorsDeBiaso, Nick (Author) / Mcintyre, Lisa (Thesis advisor) / Hesse, Marian (Committee member) / Faris, Kay (Committee member) / Arizona State University (Publisher)
Created2012
Description
Academic advisors play a critical role in student success within United States institutions of higher education. Although uniquely positioned to contribute to important institutional and student outcomes, academic advising is identified in the literature as an emerging profession, often delegitimizing advisor authority and limiting their contribution to institutional objectives. A review of the literature explores the history academic advising, and the current state of professionalization of the field. Additionally, entrepreneurial mindset is introduced as a framework of practice for professional agency. As a field working to professionalize itself within the higher education context, academic advisors must be able to fully participate and contribute to the process of developing innovative practices within the contexts of their institutions. This mixed-methods study drew upon proactive work behavior as defined by Hackman and Oldham to understand how academic advisors demonstrate and perceive their professional agency and ability to make decisions when working with students in the context of their role. Findings suggest professional agency as a construct exists not as a stand-alone concept, but rather as part of an ecosystem within the institution that includes layered systems, structures, and cultures which influence advisor behaviors and how they navigate decision-making. Implications include considerations for academic advising leaders and administrators, specifically related to departmental structures and advisor perceptions of their professional agency. This study contributes to the advising literature in the area of professionalization, with implications for scholarship and practice that can address gaps in the current scholarship.
ContributorsRudd, Melissa (Author) / Basile, Carole (Thesis advisor) / Kim, Jeongeun (Committee member) / Mcintyre, Lisa (Committee member) / Arizona State University (Publisher)
Created2021