Digital Commons Network^™

The Effects Of Air Pollution On School Attendance In The United States, Debanhi G. Alrich

Theses and Dissertations

This study employs pooled OLS and fixed effect regressions to examine the effects of ambient air pollution on self-reported school attendance in the 423 most populous counties in the United States. Information from the U.S. Census’ American Community Survey’s annual estimate is compared against county-level data for 14 common air pollutant variables. When making this comparison for the general population, we find statistically significant results for only one pollutant: ozone. We find further significant effects for the presence of ozone when respondents are grouped by race/ethnicity and by poverty ratio, indicating that effects of pollution, like many other social ills, …

By Your Powers Combined: Heroic Solutions To Climate Catastrophes In The Fifth Season, Avengers: Infinity War, And Horizon: Zero Daw N, Kematat Matthew Medrala

Theses and Dissertations

Popular entertainment has become concerned with addressing issues of climate catastrophe in order to reflect the real concerns of its audience. Because these media narratives are produced by wealthy institutions that reach millions of people, it is vital to understand what these stories say about the causes of existential crises and their presented solutions. This thesis applies an ecocritical approach informed by environmental justice theorists and Marxist theory in order to analyze what a contemporary popular film, videogame, and novel have to say about addressing an oncoming ecological crisis. This analysis reveals that mass death among the disempowered is considered …

Temporal Discounting And Sustainable Behaviors, Natalia Piskorski

Theses and Dissertations

An experimental study was conducted (N = 175) to test for differences between thinking about the future and the present when it came to sustainable behavior and attitudes. Previous studies show temporal discounting can be overcome at least in the short term to alter current behaviors; however, there is a gap in the literature in regards to sustainable behaviors. This study used similar techniques to determine whether environmentally protective behavior can be altered by having an individual imagine themselves in the future. Participants were randomly assigned to one of three groups, a current other, current self, or a future-self group. …

The Relationship Between Place Attachment And Socioscientific Reasoning Among High School Students In Puerto Rico After Negotiation With Local And Foreign Socioscientific Issues, Lorraine Judith Ramírez Villarín

Theses and Dissertations

The purpose of this mixed-method study was to explore the relationship between place attachment and socioscientific reasoning (SSR) of Puerto Rican high school students through debate and discourse of local and foreign socioscientific issues (SSI). The specific research questions were, (1) what is the extent of the participants’ place attachment to the island of Puerto Rico, (2) are there differences in SSR between groups working with local and foreign SSI, (3) is there a correlation between place attachment and SSR, (4) are there differences in SSR between scenarios after SSI negotiation, and (5) do negotiation and discourse improve after SSI …

Impact Of Autoclaved Aerated Concrete (Aac) On Modern Constructions: A Case Study In The New Egyptian Administrative Capital, Esraa Ahmed Khalil

Theses and Dissertations

Building materials selection is critical for the sustainability of any project. The choice of building materials has a huge impact on the built environment and the cost of projects. Building materials emit huge amount of carbon dioxide (CO2) due to the use of cement as a basic component in the manufacturing process and as a binder which harm our environment. Energy consumption from buildings has increased in the last few years; a huge amount of energy is being wasted from using unsustainable building and finishing material as well as from the process of heating and cooling of buildings. In addition, …

Projected Impacts Of Climate Change On Risk Of Spring Frost And Fire Blight For Malus Domestica, Paul J. Racco

Theses and Dissertations

The impact of climate change is projected for apple phenology, frost attrition, and fire blight risk under the highest emissions scenario through the 21st century.

At-Home Childcare Providers’ Perceptions Of Gardening With Children, Erin Lauckner

Theses and Dissertations

Children do not consume recommended amounts of fruits and vegetables, which has been correlated with negative health consequences. Gardening with children has been shown to positively impact children’s consumption of these foods. While research investigating gardening with children exists, much of this has been conducted with teachers and children in schools, and limited research has been conducted with childcare providers and preschool-aged children. Little research has been conducted about this topic with in-home childcare providers and the children under their care. This pilot study utilized a cross-sectional mixed methods research design through an online survey instrument. A convenience sample of …

Constraints On Phytoplankton Abundance And Cyanotoxin Production In The Tidal Freshwater James River, Brittany Ann Moretz

Theses and Dissertations

The tidal freshwater James River exceeds chlorophyll-a (CHL-a) water quality standards and the cyanotoxin microcystin is commonly present. Efforts to control harmful algal blooms in the James have brought about significant reductions in nitrogen and phosphorus inputs, but chlorophyll levels have not changed. In order to better understand the factors constraining harmful algal blooms in this system, we performed three factorial mesocosm experiments that tested how light (ambient, enhanced), mixing (weak mixing, well-mixed), and the availability of dissolved inorganic nitrogen (pre/post NH₄⁺ reductions) influence the abundance of phytoplankton (CHLa, particulate organic carbon [POC]) and cyanotoxin production (microcystin, anatoxin) …

Design Hub: Activating Community By Design, Ed Williams

Theses and Dissertations

MOTIVATION

At the turn of the century, Robert Putnam (2000, 27) wrote “...a powerful tide bore Americans into ever deeper engagement in the life of their communities, but a few decades ago that tide reversed and we were overtaken by a treacherous rip current.” Putnam is describing a loss of “social capital” throughout American society. Research suggests that many of our contemporary issues are the result of a decline in “social capital,” or “community.”

This pervasive lack of community is thought to be detrimental to “educational performance, safe neighborhoods, equitable tax collection, democratic responsiveness, everyday honesty, and even our health …

Environmental Governance For Whom? Examining The Political, Institutional, Fiscal, And Legal Determinants Of State Environmental Agency Budget Policy In The Us, Andrew R. Duggan

Theses and Dissertations

Budgets are a prospective tool of governance, and appropriations are a planning vehicle reflecting: bureaucracies’ values, complex interactions, collective preferences, political influences, and available resources. Research spanning 30 years finds that environmental pollution is a key determinant of environmental budgets in the US, though myriad factors, actors, and subsystems are important to consider. Due to federalism and devolution of responsibilities and authorities, environmental governance falls largely to the states. While the dynamics that shape state environmental budget policy have received scholarly interest, theoretically-driven examinations of environmental appropriations remain limited within the public budgeting and environmental policy literature.

Using panel data …

The Influence Of Breeding Density On Female Aggression, Parental Care, And Ornamentation In A Secondary-Cavity Nesting Warbler, Elsa B. Chen

Theses and Dissertations

Tradeoffs between individual survival and reproductive success associated with aggressive behaviors are a driving force of evolution, but these tradeoffs are often overlooked for aggressive conspecific interactions between females. For avian males, it is well documented that more aggressive individuals tend to provide less parental care. In the few studies that address this in females, the tradeoffs seem to be more context-dependent, varying due to factors such as predation pressure and habitat quality. The relationship between female ornamentation and aggression is similarly understudied, but evidence suggests that both aggression and ornamentation are important traits involved in social selection – the …

Comparing Coastal Storm Impact To Decadal Change In Barrier Island Ecosystems, Philip A. Tuley

Theses and Dissertations

Highly dynamic coastal systems respond to disturbance events with a combination of topographic and vegetative changes. Sea level rise impacts on barrier islands have been quantified, but storm effects on vegetation are limited. Here we quantified barrier island vegetation change in response to an isolated storm event and compared to long-term periods. We hypothesized that disturbance-resisting areas with high woody vegetation cover and/or high foredune elevation would experience minimal transitions after a storm event, whereas disturbance-reinforcing areas with low vegetation cover and low foredune elevation would experience greater transitions between ecosystem states after a storm event. Patterns of dissonance were …

Plant-Pollinator Associations In An Eastern Serpentine Savannah And The Effects Of Overbrowsing, Allyson Richins

Theses and Dissertations

Chapter 1: Native plant response to deer overbrowsing in a serpentine savannah

Plants are particularly vulnerable to physical disturbance in low productivity areas, due to a high cost of replacing lost plant tissue. In the eastern United States, serpentine grasslands are fragmented ecosystems with high concentrations of rare endemic plant species, low concentrations of soil nutrients, and uncontrolled deer overpopulation. This study assessed functional responses of native angiosperms in a rare eastern serpentine savannah to selective deer browsing. Plant count, flower count, floral area, vegetative area, and plant height of 10 serpentine plant species were compared inside and outside of …

Assessing The Feasibility Of Freshwater Mussel Restoration In Urban Streams., John-Reid Ryan

Theses and Dissertations

Abstract

The main objective of this study was to determine whether introduced freshwater mussels (Alewife floater, Utterbackiana implicata) can survive and grow in urban streams in the James River watershed. A secondary objective was to assess differences in U. implicata survival and growth of in the context of differing water quality and food resource conditions among three urban sites and three rural sites. Results from this study show large differences in growth and survivorship of mussels across sites. Higher survivorship was observed among mussels stocked into rural streams (35% and 44%) in comparison to urban streams (3%, 6% and 14%). …

Taxa Specific Responses To Flooding Shape Patterns Of Abundance In A River Rock Pool Metacommunity, Charles R. Stunkle

Theses and Dissertations

Connectivity and habitat area are important landscape characteristics that drive patterns of abundance and diversity across scales. However, responses to connectivity and patch size are dependent on species traits. Riverine landscapes are highly dynamic both spatially and temporally with hydrologic connectivity being a major driver of abundance and diversity. Here we modeled densities of the Virginia river snail and skimmer dragonfly nymphys, two taxa with differences in their dispersal abilities and life histories, as a function of flooding, patch area, and season in over 300 riverine rock pools. We found key differences in how each taxon responded to these predictors …

Evidence Of Local Adaptation To Climate In An Invasive Ectotherm: A Study On The Eurasian Gypsy Moth (Lymantria Dispar) In North America, Phillip M. Gibbs

Theses and Dissertations

Invasive species exist in nearly every ecosystem both terrestrial and aquatic. Improving our understanding of the mechanisms that shape the ability of these organisms to physiologically cope with their surroundings will be crucial to preparing for future impacts of climate change. The Gypsy Moth (Lymantria dispar) has been expanding its range across North America over the last 100+ years since its arrival in Medford, Massachusetts. This study quantifies upper thermal limits (UTL) across 8 different populations of L. dispar in North America and seeks to determine if signals of local adaptation to climate across a latitudinal gradient may …

Analysis Of Teaching Styles, Adult Learning Theories, And Factors Influencing Teaching Style Preferences In Adult Education Instructors: Implication For Practice, Beatrice Chemaiyo Lele

Theses and Dissertations

The teacher is the most influential and important variable in the classroom for student achievement. Therefore, the need for teachers to identify and utilize best teaching practices is fundamental to a progressing society. Despite the literature advocating and proposing the student-centered approach as the preferred method of teaching in adult education, most empirical studies indicate that teachers employed the traditional teacher-centered approach. The purpose of this study was to examine the teaching style preferences of adult education instructors and the influence of gender, age, participation in professional development in adult education, years of teaching experience, teaching subject, and levels of …

Regional Drivers Of Organic Carbon Age In Lotic Systems Of The Conterminous United States, Kaycee Faunce

Theses and Dissertations

Rivers play a critical role in global carbon (C) budgets despite their comparatively small surface area. A significant portion of the terrestrial C that they receive is transformed, re-mineralized, or stored during transit to the ocean. Radiocarbon (∆¹⁴C) data show that a fraction of riverine organic C (OC) has been pre-aged in the terrestrial environment. Lateral export of carbon from these aged pools may contribute to atmospheric carbon dioxide emissions through microbial and photochemical oxidation. However, little is known about the regional climatic, anthropogenic, and landscape factors that promote the mobilization of aged OC to rivers. This study …

Stimulated Growth Response To Sand Burial Of A Coastal Shrub, D. Nicole Keller

Theses and Dissertations

Drivers of vegetation zonation on barrier islands are complex and interconnected. Sand burial is a strong driver in dynamic coastal systems, especially in the foredune community. However, it is not well understood how burial impacts the interdunal swales communities and it is especially difficult to separate the effects of burial from salinity. Climate change is altering the frequency of overwash events as well as expanding the range of the native shrub, Morella cerifera, on the Virginia barrier islands. To accurately forecast island response to climate change it is important to understand how the shrub responds to sand burial. Juvenile …

Bee Diversity Of Three Appalachian Shale Barren Sites, Olivia C. Latham

Theses and Dissertations

Insect pollination is vital to ecosystem function. However, climate change, habitat loss, pesticides, and a variety of other anthropogenic sources are contributing to a decline in pollinator diversity. Fragile small ecosystems with a high composition of specialized plant species that rely on specific pollinators such as Appalachian shale barrens, are especially at risk of losing biodiversity. This study combines the use of active sweep net sampling of endemic shale barren forbs and passive trap methods over the course of a bloom season (April-August) in three barren sites to identify bee community populations and visitation relationships between pollinator species and endemic …

Trajectory Optimization And Design For A Large Number Of Unmanned Aerial Vehicles, Jenna Elisabeth Newcomb

Theses and Dissertations

An unmanned aerial vehicle (UAV) swarm allows for a more time-efficient method of searching a specified area than a single UAV or piloted plane. There are a variety of factors that affect how well an area is surveyed. We specifically analyzed the effect both vehicle properties and communication had on the swarm search performance. We used non-dimensionalization so the results can be applied to any domain size with any type of vehicle. We found that endurance was the most important factor. Vehicles with good endurance sensed approximately 90% to 100% of the grid, even when other properties were lacking. If …

Investigating The Relationship Of Copd, Lung Cancer, And Polycyclic Aromatic Hydrocarbons From Ambient Air Pollution, Daniel John Kilpatrick

Theses and Dissertations

Polycylic aromatic hydrocarbons (PAHs) are a group of chemically-related compounds with a well-established body of evidence of adverse human health impacts. Additionally, there is a growing area of research on the health outcomes following PAH exposure via air pollution, specifically with chronic obstructive pulmonary disorder (COPD) and lung cancer. The purpose of this dissertation was to investigate the strength of associations among PAHs, COPD, and lung cancer from ambient (outdoor) air pollution. The first objective was to determine if there is a potential environmental link among PAHs, COPD, and lung cancer occurrence among nonsmokers using data from the National Health …

Using Long Time Series Of Satellite Remote Sensing Data To Assess The Impact Of Climate And Anthropogenic Changes In The Mesopotamian Marshes, Iraq, Reyadh Albarakat

Theses and Dissertations

In the recent past, the Mesopotamia region has been rich in all forms of biological diversity, characterized by a fertile living environment and natural habitats full of rare birds, wild animals, aquatic animals, and diverse plants. Its natural abundance and geographical location have allowed it to be break or transit point for millions of migratory birds from Russia to South Africa. It is a breeding ground for many species of Persian Gulf fish. Despite all this historical, environmental and economic richness, they have been neglected as a result of the combination of a number of human and climatic factors, which …

Estimation Problems For Pooled Data, Xichen Mou

Theses and Dissertations

In epidemiological applications, individual specimens (e.g., blood, urine, etc.) are often pooled together to detect the presence of disease or to measure the concentration level of a specific biomarker. Due to the advantage of cost efficiency, pooled data are also seen in diverse areas such as genetics, animal ecology, and environmental science. With pooled data, individual observations are masked and new statistical methods are needed to estimate characteristics such as disease prevalence, the underlying density function of a biomarker, etc. We focus on three estimation problems for pooled data. Chapters 2 and 3 propose nonparametric estimators for the density function …

Aesthetic Perception Of Urban Spaces: New York, Timur Pozhidaev

Theses and Dissertations

Aesthetic perception is an important field of interest in many aspects of everyday human life. It affects individual and social unconscious behavior and is strongly related to the decision-making processes in the human mind. The current study can serve as an important prototype for planning purposes and social and environmental justice among the regional units of New York City. With the current scientific sphere lacking a comprehensive methodology for assessing social superstructure, an aesthetic framework has the potential for success in evaluating the aspects of sustainable and resilient urban development.

Observation Of Visitors At A Chimpanzee (Pan Troglodytes Schweinfurthii) Ecotourism Site Reveals Opportunity For Multiple Modes Of Pathogen Transmission, Darcey Glasser

Theses and Dissertations

Chimpanzee (Pan troglodytes) tracking is a popular ecotourism activity across Sub-Saharan Africa, offering visitors a personal wildlife experience. However, chimpanzee ecotourism may increase the risk of disease transmission between chimpanzees and people. This study assessed how tourist behaviors might facilitate cross-species disease transmission in Kibale National Park, Uganda.

A Smartphone App Survey To Encourage Sustainable And Healthy Travel Mode Choices, Paul Rivers

Theses and Dissertations

Can access to carbon footprint and health [calorie and fat burn] information influence transportation behavior? Survey methods are used in conjunction with a smartphone GPS mobile app to measure transportation tendencies in weekdays – weekends, and willingness to undertake modal shift based on app experience over one week.

Electrochemical Modification Of Granular Activated Carbon And Carbon Nanofibers To Determine Effect On Adsorption, Jose E. Martinez Sanchez

Theses and Dissertations

Granular activated carbon and carbon nanofiber samples were tested as is and electrochemically modified to determine the effect on adsorption. An electrochemical cell was used to modify the carbon samples. The samples were then used in bench bottle tests with 2,4-dinitrotoluene (DNT), brilliant blue (BB) dye, and methylene blue (MB) dye solutions and sampled over time intervals. An ultraviolet–visible spectrophotometer was used to analyze the results of the bottle bench tests. The results indicated that electrochemically modified coal-based carbons’ adsorption were improved 25% over the adsorption of the as is carbon samples prior to modification. The electrochemical modification increased adsorption …

Exploring Local Environmental Factors Influencing Geographic Distribution Of Black-Legged Tick Questing Activity, Chong Di

Theses and Dissertations

The deer tick (Ixodes scapularis or I. scapularis), also known as the black-legged tick, is the primary vector that transmits Lyme Disease (LD) in Northeastern United States. To contain the geographic expansion of Lyme disease ticks across the US in recent decades, ecological studies have been conducted to understand the biotic and abiotic environmental factors affecting tick activity. We observed in preliminary surveys that the tick host-seeking activity varies across small local areas. The primary objective of this project is to identify the environmental factors that impact deer tick questing activities at the micro-geographic scale. From 2017-2018, we …

Climatic Variables Are Strong Predictors Of Allonursing And Communal Nesting In Primates, Alexandra Louppova

Theses and Dissertations

Allomaternal care (AMC) is widespread throughout the primate order, previous studies have focused on benefits and costs to individuals. However, our understanding of environmental impacts on AMC behaviors in primates is still limited. Our study examines how ecology and environmental factors can predict certain AMC behaviors more than others.