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- Creators: Brady, Ward
Description
Worldwide, riverine floodplains are among the most endangered landscapes. In response to anthropogenic impacts, riverine restoration projects are considerably increasing. However, there is a paucity of information on how riparian rehabilitation activities impact non-avian wildlife communities. I evaluated herpetofauna abundance, species richness, diversity (i.e., Shannon and Simpson indices), species-specific responses, and riparian microhabitat characteristics along three reaches (i.e., wildland, urban rehabilitated, and urban disturbed) of the Salt River, Arizona. The surrounding uplands of the two urbanized reaches were dominated by the built environment (i.e., Phoenix metropolitan area). I predicted that greater diversity of microhabitat and lower urbanization would promote herpetofauna abundance, richness, and diversity. In 2010, at each reach, I performed herpetofauna visual surveys five times along eight transects (n=24) spanning the riparian zone. I quantified twenty one microhabitat characteristics such as ground substrate, vegetative cover, woody debris, tree stem density, and plant species richness along each transect. Herpetofauna species richness was the greatest along the wildland reach, and the lowest along the urban disturbed reach. The wildland reach had the greatest diversity indices, and diversity indices of the two urban reaches were similar. Abundance of herpetofauna was approximately six times lower along the urban disturbed reach compared to the two other reaches, which had similar abundances. Principal Component Analysis (PCA) reduced microhabitat variables to five factors, and significant differences among reaches were detected. Vegetation structure complexity, vegetation species richness, as well as densities of Prosopis (mesquite), Salix (willow), Populus (cottonwood), and animal burrows had a positive correlation with at least one of the three herpetofauna community parameter quantified (i.e., herpetofauna abundance, species richness, and diversity indices), and had a positive correlation with at least one herpetofauna species. Overall, rehabilitation activities positively influenced herpetofauna abundance and species richness, whereas urbanization negatively influenced herpetofauna diversity indices. Based on herpetofauna/microhabitat correlations established, I developed recommendations regarding microhabitat features that should be created in order to promote herpetofauna when rehabilitating degraded riparian systems. Recommendations are to plant vegetation of different growth habit, provide woody debris, plant Populus, Salix, and Prosopis of various ages and sizes, and to promote small mammal abundance.
ContributorsBanville, Mélanie Josianne (Author) / Bateman, Heather L (Thesis advisor) / Brady, Ward (Committee member) / Stromberg, Juliet (Committee member) / Arizona State University (Publisher)
Created2011
Description
With 2016 marking the 100th Anniversary of the National Park Service (NPS), important discussions regarding the future of America's beloved parks and respective government funding must take place. Imagine all the money, including tax revenue, flowing through America's national parks system, and where is that money destined for in the future? National park funding will factor greatly into determining the future of America's NPS and individual parks. Therefore, it is imperative to investigate where and how government funding, for the present and future, is distributed throughout the parks protected under the NPS. Through personal experiences as a child, national parks consistently provide a unique exposure to and an education of the natural world, which are rare finds when growing up in suburban or metropolitan regions. Narrowing down, this analysis will focus on government disbursements to Yellowstone National Park (Yellowstone) and Isle Royale National Park (Isle Royale) with specifics on two budgeted projects crucial to park survival. Yellowstone and Isle Royale each request funding for a project crucial to the park's ecosystem and a project intended to improve guest services for visitors. Closing comments will provide recommendations for Yellowstone, Isle Royale and the NPS, including effects of President Trump's 2018 Government Proposed Budget, in an attempt to offer forward thinking about national parks. The projects and respective funding as detailed in this analysis have a forward-thinking focus as other projects included in the NPS requested funding budgets consider as well. Current actions and efforts are crucial to the long-term life and of this country's national parks for future generations to come.
ContributorsHager, Madeline (Author) / Samuelson, Melissa (Thesis director) / Kenchington, David (Committee member) / Department of Marketing (Contributor) / School of Accountancy (Contributor) / Barrett, The Honors College (Contributor)
Created2016-12