Digital Commons Network^™

The Impact Of Photopollution On Nesting Loggerhead Sea Turtles (Caretta Caretta) Along The Grand Strand, South Carolina, Ryan Bonner

Electronic Theses and Dissertations

Photopollution present along heavily developed coastlines is known to have a significant negative impact on nesting sea turtle populations by damaging nesting habitat quality, but few studies have explored this relationship on broad spatial scales. The purpose of this study was to characterize the onshore light field along a developed stretch of South Carolina coastline and to quantify how photopollution intensity affects regional loggerhead sea turtle (Carretta carretta) nesting density using historical nesting data. Light measurements were collected using a portable low-light photometer at 74 sites spaced at approximately one km intervals across the study area. At each site, the …

Characterization Of Groundwater Discharge In A Back Barrier Tidal Creek, Matthew L. Carter

Electronic Theses and Dissertations

Groundwater discharge in the coastal environment is known to be a complex process. The driving mechanisms of groundwater discharge vary on spatial and temporal scales that can significantly impact coastal water chemistry and play a role in ecological zonation. Evolving combinations of observational and modeling approaches provide a basis to quantify groundwater discharge in a spatial and temporal sense. Here we employ a combination of geochemical (naturally occurring radon isotope) and geophysical (electrical resistivity) techniques to measure groundwater-surface water interactions along a back-barrier tidal creek. In addition to field measurements, a unique non-steady state radon mass balance equation was developed …

Quantifying Water Budgets To Evaluate The Hydrologic Performance Of Two Stormwater Detention Ponds In Coastal South Carolina, Samantha Corley

Electronic Theses and Dissertations

Due to their ability to reduce local flooding and protect receiving waters from intense stormwater pulses, stormwater detention ponds are commonly used stormwater management practices. Stormwater engineers construct ponds to moderate peak flow intensities and to allow residence time of the water within the pond to enhance nutrient removal prior to discharging into downstream ecosystems. Yet rarely, if ever, is the functionality of these ponds verified post-construction. This study aimed to compare hydrologic performance of two stormwater detention ponds located in coastal South Carolina to theoretical design plans by assessing a high resolution water budget. Inflow components of the water …

Impact Of Development On Freshwater Turtle Populations Of Coastal South Carolina: An Examination Of Land Use And Road Density, Andre Dominguez

Electronic Theses and Dissertations

Previous studies (Haxon 2000; Steen and Gibbs 2004; Marchand and Litvaitis 2004; Aresco 2005) have demonstrated that urbanization and development have disproportionally adverse affects on female turtles. In order to test this paradigm I caught 301 turtles (primarily Trachemys scripta scripta) in ten ponds (5 impacted and 5 unimpacted) across coastal South Carolina. Not only do coastal South Carolina turtles not follow the same male biased pattern of many other studies, there was an overall female bias (154:95). Turtle metrics were between the types of sites existed as well, indicating larger/older population of turtles in unimpacted sites. Water quality parameters …

A Comparison Of Whole Body Mercury Concentrations Of Mummichogs (Fundulus Heteroclitus) And Atlantic Silversides (Menidia Menidia), Daniel P. Ferons

Electronic Theses and Dissertations

Few studies have focused on mercury cycling within salt marsh estuaries. Mummichogs (Fundulus heteroclitus) and Atlantic silversides (Menidia menidia) are two species of forage fish that live year round in South Carolina salt marshes. During high tide, mummichogs feed from the water column, sediment, and off of smooth cordgrass while Atlantic silversides prey upon zooplankton. In this study, total and methyl mercury within mummichogs and Atlantic silversides from Dunn Sound, SC were quantified and compared over four seasons throughout 2014. Gut contents were also quantified and compared to determine if there was a dietary impact on the concentrations of total …

The Fish Kill Mechanism Of The Harmful Raphidophyte Chattonella Subsalsa, Amy E. Grogan

Electronic Theses and Dissertations

Harmful algae blooms (HABs) and toxins associated with HAB species are a significant threat to the health of marine species and coastal environments. In the South Carolina coastal zone, HABs have proliferated with intensified anthropogenic eutrophication in coastal waters. The raphidophyte species Chattonella subsalsa is a prominent cause of algal blooms resulting in fish kills in South Carolina. Though C. subsalsa is a known ichthyotoxic alga, the fish kill mechanism of this species remains unidentified. C. subsalsa is likely to elicit fish mortality via one of two mechanisms: (1) gill damage induced by cell contact irritation or (2) the production …

Tide-Dependent Predation Patterns Of Piscivorous Fishes In Shallow Estuarine Creeks, Matthew Ross Helms

Electronic Theses and Dissertations

The distribution and foraging behavior of predatory salt marsh fishes is shaped by the movements of prey, many of whom seek shelter in shallow and tributary creeks. I hypothesized that the distribution of piscivorous fishes in marsh creek channels would differ with proximity to the mouths of intertidal creeks and with tidal stage. Custom-built trotlines baited with live minnows were deployed during four discrete tidal stages at two microhabitats in main creek channels: (1) adjacent to intertidal creek mouths, and (2) along straight banks in North Inlet estuary, South Carolina. Catch-per-unit-effort of predatory fishes was significantly higher (Wilcoxon signed-rank tests, …

Linking Water Quality And Beach Morphodynamics In A Heavily Impacted Tidal Creek In Myrtle Beach, South Carolina, Brittany Lynne Hoffnagle

Electronic Theses and Dissertations

The morphological changes of small tidal creeks, driven by coastal processes, can pose risks to infrastructure and engineered coastlines and often rely on dredging to maintain them. These changes along the beachface can negatively affect the health of associated estuaries where open exchange between the ocean and creek basins is vital. This study used Real Time Kinematic-Differential Global Positioning System equipment to survey a small tidal creek in Myrtle Beach, South Carolina that often experiences migration to the south and requires dredging to maintain an open exchange between the ocean and the estuary. In order to understand the relationships between …

Built For Boyhood?: A Proposal For Reducing The Amount Of Gender Bias In The Advertising Of Children's Toys On Television, Nareissa L. Smith

Vanderbilt Journal of Entertainment & Technology Law

While the last half-century has seen a dramatic increase in the number of US women in the workforce, women remain under represented in STEM (Science, Technology, Engineering, and Mathematics) fields. For years, researchers and social commentators have tried to explain the persistence of this gender gap. Some have even argued that genetic differences explain women's inability to excel in the hard sciences. This Article asserts that the impact of socialization on children's educational and occupational choices has been greatly underestimated. Specifically, the toys that are marketed to boys teach spatial skills that prepare boys for STEM careers. Conversely, the toys …

It Takes A Village: Placing Middle Rocky Mountain High Altitude Residential Sites Of The Late Prehistoric Firehole Phase Into A Broader Regional Context, Bryon Alan Schroeder

Graduate Student Theses, Dissertations, & Professional Papers

This dissertation presents three separate articles in different stages of peer-review all focused on late Late Prehistoric (AD 1300 to contact) residential occupations, in the Wind River Range and Shirley Basin of Wyoming. These articles cover survey results in in the Wind River Range of Wyoming, Shoshone ethnic interpretations associated with Late Prehistoric artifact assemblages, and a lithic analysis from the excavated interior of domestic structure at an alpine and basin location of the Firehole Phase. These articles broaden the research agenda of high-altitude sites to downplay the role of ethnicity and include adjacent sites of the Wyoming Basin. In …

An Empirical Investigation Of The Buddhist Concept Of "Not-Self", Christian Herwitz

Graduate Student Theses, Dissertations, & Professional Papers

All individuals have notions about how they would likely approach themselves under times of stress, as well as the ways which would be most helpful to them. The present study investigated four broad ways of approaching the self under stressful circumstances: self-esteem, self-control, self-compassion, and not-self. Not-self, a concept based in Buddhist philosophy, is novel to a Western population, and was the primary focus. In order to comprehensively examine the concept, data were collected from 168 undergraduates on responses to stressful circumstances: by bolstering self-esteem, engaging in self-control behaviors, engendering a sense of self-compassion, or accepting/letting go thoughts, feelings, wants, …

Dynamic Motions Of The Alpha Subunit Of Heterotrimeric G Proteins In The Nucleotide- And Ric-8a-Bound States, Labe Adam Black

Graduate Student Theses, Dissertations, & Professional Papers

The conformational changes and segmental dynamics involved in the G alpha-subunit of heterotrimeric G proteins have been investigated for 3 separate binding states by using binning-time-dependent single-molecule F÷rster resonance energy transfer (smFRET) of freely diffusing proteins and time-resolved fluorescence anisotropy. The bound states include Ric-8A (Resistance to Inhibitors of Cholinesterase-8A (Miller, Emerson et al. 2000; Miller and Rand 2000; Tall, Krumins et al. 2003)), a guanine nucleotide exchange factor (GEF), and nucleotides GDP and GTP. To analyze the smFRET data, energy transfer efficiency histograms were constructed at binning times varied from 1000 to 2,500 ╡s. Then the conformational equilibria and …

Institutional Effectiveness In An Open System: A Case Study Of Graduation Rates In The Montana University System, Anneliese A. Ripley

Graduate Student Theses, Dissertations, & Professional Papers

This is a mixed-methods, non-experimental, cross-case study designed to examine the environmental conditions that influence institutional effectiveness within one state-governed university system. The purpose of the study was to examine nationally defined graduation rates as a performance indicator of institutional effectiveness. Eleven delimited campuses in the Montana University System constituted the sample population. The quantitative analysis compared federally mandated graduation rates with graduation rates resulting from a modified graduation rate methodology. The qualitative analysis evaluated environmental conditions at each of the institutions. The cross-case analysis synthesized the quantitative and qualitative data using an open-systems framework to identify emergent patterns. Three …

An Assessment Of Biochar Amended Soilless Media For Nursery Propagation Of Northern Rocky Mountain Native Plants, Clarice P. Matt

Graduate Student Theses, Dissertations, & Professional Papers

A study was conducted to better inform nursery practitioners of the potential benefits of biochar application in common nursery media for native plant propagation. Biochar – a carbon-rich, recalcitrant charred organic co-product of the bioenergy pyrolysis process – has emerged as a promising potential replacement for various components of soilless media, namely peat, perlite, and vermiculite, in nursery seedling propagation. A strong conceptual basis exists for biochar as a nursery media amendment, but empirical data on biochar-based plant propagation is limited. This greenhouse study examined the effects of biochar displacement of standard soilless nursery media at rates of 0%, 15%, …

The Habitat Of European Brown Bears In Northern Spain: Mapping Habitat Fragmentation And Potential Connectivity, Alma D. Pacheco

Graduate Student Theses, Dissertations, & Professional Papers

The European brown bear in northern Spain is considered to be an endangered species whose habitat has been fragmented into two subpopulations due to habitat loss and lack of connectivity. The importance of improving connectivity and preventing more habitat destruction is vital to recover the species in this region. This research looks at spatial and temporal variations of brown bear habitat by mapping the conditions of habitat fragmentation and potential connectivity at a regional extent. This research examines net changes of brown bear habitat fragmentation between 1990-2000, 2000-2006, and overall 1990-2006; and the degree of brown bear habitat connectivity between …

Cows And Plows: Science-Based Conservation For Grassland Songbirds In Agricultural Landscapes, Marisa K. Lipsey

Graduate Student Theses, Dissertations, & Professional Papers

Temperate grasslands are among earth’s most imperiled ecosystems. In North America, steep declines of endemic songbird populations indicate that grassland loss and degradation may be approaching critical levels. Grasslands are agricultural landscapes largely (~85%) under private ownership with little formal protection status. Remaining bird populations depend on grazing lands that have not been converted to cropland. We combine regional data from a hotspot for grassland bird diversity (northeast Montana, USA; 26,500-km2) with continental data spanning the northern Great Plains (1,000,000-km2) to evaluate how land use and management influence bird distribution and abundance. Regionally, habitat used by seven grassland specialists spanned …

Comparative Analysis Of Email Request Strategies Used By Native And Non-Native Speakers Of English In Academic Settings, Karyna Tytar

Graduate Student Theses, Dissertations, & Professional Papers

This thesis presents an analysis of pragmatic features of email request composite parts: email openings and closings, request Head Acts, and supportive moves elicited from native speakers (NSs) and non-native speakers (Non-NSs) of English, in two different email request situations. The two email request situations in this study have different levels of imposition, where the email request in situation 1 is considered more of an imposition than the email request in situation 2. It is thus expected that email requests in situation 1 would exhibit more politeness features than email requests in situation 2.

Analysis of the email request composite …

Wilderness And Epistemic Wildness, John T. Stanfield

Graduate Student Theses, Dissertations, & Professional Papers

The traditional concept of wilderness was a product of the time out of which it came. Times have changed. The social context of conservation, how humans affect nature, and scientific understanding of how ecosystems function have all shifted in ways that make the wilderness idea problematic. The values that people found in wilderness are still relevant, however. It is the way that they are tied together in the concept of wilderness that has become a problem.

I propose a revised concept of wilderness that meets the concerns of critics of wilderness, and accounts for the tension between the wild and …

A Model For Determining Drivers Of Phenology In Western United States Rangelands, Joseph R. St. Peter

Graduate Student Theses, Dissertations, & Professional Papers

Plant phenology has long been used as an indicator of climate. Recent changes in plant phenology are evidence of the influence of climate change. Modeling plant phenology has become an effective tool to understand the impacts of climate change. Using machine learning techniques I developed a modeling process for accurately predicting phenology across a diverse landscape. This model uses individual site data to set site specific climate thresholds for plant phenology. This model also identifies the limiting factors to vegetation phenology for rangelands in the western United States. NDVI remotely sensed data was used to quantify land surface phenology and …

Sacred Zones: Examing Wilderness In Yellowstone, Maine And Russia, Lily S. Vonderheide

Graduate Student Theses, Dissertations, & Professional Papers

This thesis seeks to examine issues of resource conservation and recreational access in three regions of immense historical and ecological significance: Yellowstone National Park, the North Woods of Maine, and the protected nature reserve system of Siberia. By applying a combination of direct professional experience, current research and ongoing environmental policy action, the thesis attempts to provide an accurate picture of current and future challenges facing the three regions. Part I, “Yellowstone Paradox,” traces the roots of Yellowstone’s restrictions on recreational boating access in a post-WWII discourse of consumer recreation, the development of a sustainability ethic and its deployment as …

Impact Of A Flame Resistant Synthetic Material Base Layer On Heat Stress Factors, Matthew C. Dorton

Graduate Student Theses, Dissertations, & Professional Papers

Protective clothing worn by wildland firefighters (WLFF) may increase physiological strain and heat stress factors due to increased insulation and decreased ventilation. PURPOSE: To examine the effects of a flame resistant synthetic material base layer on heat stress factors. METHODS: Ten recreationally active males (25 ± 6.1 yrs, 80.9 ± 8.4 kg, 11.1 ± 5.3% fat, 4.4 ± 0.6 L·min-1 VO2 max) completed two trials of intermittent (50 min walking, 10 min sitting) treadmill walking (4km/hr, 4% grade) over 3 hours in a hot, dry environment (35⁰C, 30% rh). Participants wore standard WLFF Nomex green pants, Nomex yellow shirt with …

The Sensitivity Of Soil Respiration To Soil Temperature, Moisture, And Carbon Supply At The Global Scale, Andrew Hursh

Graduate Student Theses, Dissertations, & Professional Papers

Soil respiration is one of the most important terms in the global carbon budget, yet we know very little about how important environmental factors control this process at the global scale. Soils contain more carbon than terrestrial biomass and the atmosphere combined and contribute ten times more carbon dioxide to the atmosphere each year than the burning of fossil fuels. This study provides new insight on the factors driving soil respiration at the global scale by assimilating satellite observations of soil moisture, temperature, and net primary productivity with the Global Soil Respiration Database (SRDB).While temperature, moisture, carbon supply and other …

The Last Wolves Of Isle Royale, Kasey Rahn

Graduate Student Theses, Dissertations, & Professional Papers

Isle Royale National Park, located in Michigan, is home to a wolf population that is in decline due to complications from inbreeding. Scientists and managers struggle to decide whether to intervene. Some scientists promote bringing new wolves to the island to restore the population because they say the decline is human-caused. Others promote “watchful waiting.” To date, the National Park Service has not interceded and is currently undergoing a management planning process. The issue raises questions about what it means to manage wildlife in an era of change. Should humans intervene to protect wildlife in the face of climate change …

Hypothyroidism And The Development Of Hypertension, Kaleb Short

All Graduate Theses, Dissertations, and Other Capstone Projects

Low thyroid hormone (TH) in adulthood is associated with increased risk of cardiovascular disease, including risk of hypertension. The Spontaneously Hypertensive Rat (SHR), exhibits alterations in thyroid function when compared to normotensive controls. Interestingly, inhibiting thyroid gland function before 4 weeks of age prevented hypertension in the SHR, indicating that TH is involved in the etiology of SHR hypertension. However, these studies utilized tail-cuff photoplethysmography (PPG), which is known to have stress-induced artifacts, and did not compare effects in the normotensive parent strain Wistar Kyoto (WKY) rat. Therefore, it is uncertain whether TH is responsible for an elevation in baseline …

Sun-Compass Orientation During Natal Dispersal In Hatchling Blanding's Turtles (Emydoidea Blandingii), Meredith Anne Schlenner

All Graduate Theses, Dissertations, and Other Capstone Projects

Blanding's turtle hatchlings emerge from their natal nests naïve to environmental stimuli and primarily sense visual cues on the horizon as a dispersal target. During a period of hours or days, hatchlings develop a compass mechanism that allows them to maintain a direction of travel, even when the target is not visible. We examined the dispersal directions of Blanding's turtle hatchlings captured during dispersal by translocating them into a circular arena in a field of corn in order to measure their dispersal direction guided by a compass mechanism. To test for use of a sun compass, a magnetic compass, or …

The Fertility Problem Inventory And Infertility-Related Stress: A Case Study, Staci Leigh Born

All Graduate Theses, Dissertations, and Other Capstone Projects

More than seven million people of childbearing age in the United States experience infertility. For women, the experience of infertility is stressful. The Fertility Problem Inventory (FPI) has been used to quantitatively measure women's experience of infertility-related stress. However, the construct of infertility-related stress is poorly described in existing literature. The purpose of this case study was understand how women experience the FPI as a measure of infertility-related stress. To address this issue, women who are undergoing infertility treatment completed the FPI and participated in unstructured interviews. Archival documents were also retrieved to corroborate findings and satisfy saturation. Results indicate …

Through The Looking Glass: Barriers And Coping Mechanisms Encountered By African American Women Presidents At Predominately White Institutions, Maria Louise Baxter-Nuamah

All Graduate Theses, Dissertations, and Other Capstone Projects

The purpose of this research is to identify factors (experiences, career paths, and barriers) that influence the career advancement of African American women administrators in higher education. African American women's experiences in higher education are molded by both external factors and internal factors specific to "traditional" social roles within and outside of the university. This qualitative study examines the personal and professional growth of five African American women who rose to executive leadership positions as presidents at predominately white colleges or universities .

There are five main themes in this study. First, African American women who aspire to senior level …

Representing Us All? Race, Gender, And Sexuality In Orange Is The New Black, Michael Robert Chavez

All Graduate Theses, Dissertations, and Other Capstone Projects

Orange Is the New Black is a Netflix television series that began in 2013. The series focuses on the lives of inmates in a fictional women's prison. Television series about prison have focused primarily on men in prison. This thesis will expand upon previous research on representation of minorities in television using a feminist media analysis to examine the first season of the series. I will explore how race, gender, and sexuality are represented within the series. I examine the representations of four characters during the first season. I chose these four characters because they represented different racial groups, sexualities, …

She Got Her Period: Men's Knowledge And Perspectives On Menstruation, Ishwari Rajak

All Graduate Theses, Dissertations, and Other Capstone Projects

Research show that men and women often do not converse freely about menstruation. Shame, taboos and myths associated with menstruation silence the conversation. Silencing conversations about menstruation have negative consequences on women, including: objectification of women's bodies, stereotyping of women as physically, morally and emotionally inferior to men and to extreme cases women losing their uterus due to unhygienic means of menstrual management. On the one hand, not addressing menstruation openly has devastating consequences on women but on the other hand, most men seem oblivious about the impacts on women. Therefore, it is important to engage in open dialogues about …

Binder Jet Additive Manufacturing Of Stainless Steel-Hydroxyapatite Bio-Composite, Don Suranga Dhanushka Uduwage

All Graduate Theses, Dissertations, and Other Capstone Projects

This study was conducted to create a bio-composite with a porous structure using the binder-jet printing additive manufacturing process. The samples were printed by changing the parameters such as layer thickness, roller speed, sintering time and sintering temperature of the X1-Lab binder jet additive manufacturing printer. The samples were printed 80% stainless steel 316 mixed with 20% Calcium Phosphate Tribasic by volume. Eight experiments were attempted to print according to the fractional factorial design of experiment. The effects of changing parameters on the mechanical properties of the new bio-composite was tested using ASTM E-09 compressive strength standards. The compression testing …