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Winter Wheat Biomass And Yield Estimation Using Unmanned Aerial Vehicle-Based And Venµs Satellite Imagery With Machine Learning Techniques, Marco S. Chiu Mr.

Electronic Thesis and Dissertation Repository

Monitoring crop productivity is crucial in precision agriculture, often using biomass and yield as metrics to measure crop health and growth status. This thesis aims to predict dry above-ground biomass using Unmanned Aerial Vehicle (UAV) multispectral imagery, derived vegetation indices (VI), plant height, leaf area index (LAI), and plant nutrient content ratios. Additionally, the thesis tests the viability of VENμS satellite data as an alternative to other popular multispectral satellite data for predicting winter wheat yield. Conducted in two winter wheat fields in southwestern Ontario, Canada, the study employed Random Forest (RF) and Support Vector Regression (SVR) machine learning models …

A Holistic Approach To Ecosystem Decline In Mosquito Lagoon, Florida, Stephanie A. Insalaco

Doctoral Dissertations

Examining the decline of an ecosystem should be done through a holistic and interdisciplinary lens to fully understand all factors which might contribute to this ecosystem imbalance. This dissertation focuses on the declining ecosystem of Mosquito Lagoon, Florida which started to see a significant decrease in health since the early 2010s due to a variety of factors. The dissertation is separated into three papers: quantifying the total decline of seagrass in Mosquito Lagoon from 2000 to 2020, the effects of this seagrass and overall ecosystem decline on stakeholders’ livelihoods, and the regrowth of seagrass in 2023 after the events of …

Learning From Burning: Connecting Fire Managers And Fire Scientists, Coleman Lloyd Little

All Theses

The fire community is one of transparency and learning, and embedded in its culture is an openness of sharing successes and failures in order to learn and adapt. United by a shared desire to effectively understand and utilize controlled burns to successfully extinguish wildfires and research their lasting effects, fire managers and fire scientists coexist in partnerships commonly referred to as knowledge exchange networks. This research examines one such network, the Consortium of Appalachian Fire Managers and Scientists (CAFMS), through the experiences of some of its members, serving to develop an understanding of how the consortium functions as a knowledge …

The Core Of It All: From The Forest To The Concrete Jungle, Ayo Andra J. Deas

Dissertations, Theses, and Capstone Projects

The Core of It All is a component of principle within Fasaha. The mission of Fasaha is to implement programming directed toward development of one’s Core through self-actualization. Self-Actualization is defined as bringing forth the total essential qualities of one’s own consciousness, character, and identity through positive behavior. Throughout this manuscript, principle is defined as the standard of natural essential qualities determining intrinsic consciousness, character and identity. Programming is defined as providing with intrinsic instructions for the automatic performance of a task.

Fasaha is a support service that enhances the existing organization’s service. Throughout this dissertation, it will be apparent …

Pre-Columbian Soil Management, Settlement, And Land Use In Amazonia: Insights Using Micro-Regional Predictive Modelling In Gurupá, Brazil., Lauren Zacks

Electronic Theses and Dissertations

The results of a micro-regional predictive model of terra preta sites in the municipality of Gurupá are presented here. A Maximum Entropy approach was selected and modified to fit a presence-background model, rather than a presence-absence model typical of binary classifications. 13 known terra preta sites were used as input samples for the relative suitability model, with explanatory variables in the respective categories of topography, hydrology, soil type and vegetation index. A 30m spatial resolution DEM served as the basis for the former two categories, while additional TauDEM analysis was performed for the hydrology category. A Sentinel-2A mosaicked quarterly composite …

Bad Water: A Critical Analysis Of Three Municipal Water Crises Through The Lens Of Political Ecology, Noelle Evelyn Schacht

Undergraduate Honors Thesis Collection

In this paper, I analyze the municipal water crises of Flint, Michigan; Toledo, Ohio; and Jackson, Mississippi through the lens of political ecology to determine how history, power, and society have shaped the troubled water system we see in the United States today. In cities around the US, citizens cannot access clean water, violating a basic human right. Policies have been implemented to protect citizens from consuming contaminated water but are poorly enforced. Additionally, despite knowledge of the ongoing problems including insufficient treatment, outdated infrastructure, and overly contaminated source water, little has been done to remedy the situation. The theoretical …

Interpreting Geochemical Sourcing In The Northwest Great Basin: The 26wa12962 Sample Study, Tyler Alexander Reinholt

Electronic Theses, Projects, and Dissertations

Located in Northwest Washoe County Nevada along the California and Nevada border, 26WA12962 is an upland spring site consisting of habitation debris and several thousand pieces of debitage on the surface. The purpose of this research project is to interpret energy dispersive x-ray fluorescence (EDXRF) results of 80 random samples of obsidian, and fine grain volcanics such as basalt and dacite from the excavations on 26WA12962 that were conducted in 2021. This thesis will investigate if there is a preference for a specific source, as well as assisting in gathering data within a lithic landscape. To accomplish this goal, I …

How Is Wildlife Poaching Changing In Uganda And How Can We Understand The Contribution Of Wildlife Protection Efforts At Multiple Scales: Murchison Falls National Park, Uganda., Ingrid Nyonza Nyakabwa

All Dissertations

Wildlife poaching is a critical global issue that poses significant threats to biodiversity, ecological balance, and the long-term sustainability of wildlife in Sub-Saharan Africa. The illicit trade in wildlife and their derivatives continues to grow, fueled by various socio-economic, cultural, and environmental factors. As the demand for wildlife products persists, it is imperative to understand the underlying causes, impacts, and potential solutions to combat this detrimental practice.

This research examined the dimensions of wildlife poaching in and around the area of Murchison Falls National Park in Uganda, the largest and oldest National Park in Uganda. Uganda has experienced success in …

A Mixed Methods Approach To Understanding The Links Between Mining, Climate Change And Selected Health Outcomes In India, Mary J. Cheruvillil

Dissertations and Theses

Despite ample evidence of the significant role that mining activities play in determining health outcomes, in India there is a dearth of comprehensive health studies that draw linkages between mining and health. The purpose of the following study is to investigate the impact of mining activities on population health in India using three different methods: ecological multivariable regression, exploratory spatial data analysis (ESDA) and content analysis of government documents using a phenomenological approach. The first aim uses the ecological multivariable regression to examine associations between mining activities and children’s malnutrition outcomes at the district level. Census data, the Demographic Health …

Economic And Policy Determinants Of National Abortion Rates: A Cross-National Study, Olufunke Akiyode

Dissertations & Theses (Open Access)

Abortion is as old as humanity and exists in all cultures. The number and rate of abortions differ among countries and regions of the world. Some determinants of abortion may include economic indicators and policy restrictiveness. This study analyzes the economic and policy determinants of abortion by evaluating the association of income and policy on abortion rates. It uses a panel data regression to examine the association between income, Gini Coefficient and abortion rates. Gini Coefficient measures income inequality, and GNI represents a country’s income. Publicly available longitudinal data obtained from the World Bank, United Nations, United Nations Population Development …

Left Inferior Frontal Gyrus Connectivity With The Dorsomedial Subsystem Of Default Network Tracks Real-World Conversation Behaviour, Dhaval M. Bhatt

Dartmouth College Master’s Theses

Social interactions are multifaceted, complex, and critical to social behaviour as they help gather information, develop social connections, and regulate social behaviour (Lakey & Orehek, 2011; Testard et al., 2021; Jolly & Chang, 2021). Among social interactions, conversations find a special place for humans due to the nuances associated with language, conversational behaviour (e.g., gestures), and context (e.g., where conversations occur and what is discussed). Researchers have studied aspects of single conversation behaviour, content related to conversations, and brain function (Sievers et al., 2020). However, little is known about the brain function of densely-sampled in-person conversation behaviour. Filling this gap …

The Green Core Of The Big Apple: The Significance Of Urban Green Spaces In New York City & Beyond, Grace Dailey

Student Theses 2015-Present

This paper addresses the politics of urban green spaces which includes the issue of their inequitable distribution as well as related issues that can arise when communities do not have access to such spaces. There are a variety of types of urban green spaces, however, this paper will be focused on public parks. Together, such outdoor spaces can create cultural, recreational, and community building opportunities that are able to improve environmental and human health. Chapter 1 presents data about the existence and usage of urban green spaces around the world and in New York City in particular. Chapter 2 uses …

The Role Of Sharks In The Human Ecological Systems Of Isla Cedros, Baja California, Alyssa Canoff

Electronic Theses, Projects, and Dissertations

Remains of sharks are found worldwide in various archaeological contexts, but generally, the relationships between humans and sharks have been rare research topics. This thesis will present and discuss the shark remains found during the archaeological investigations at Isla Cedros, an island off the Pacific coast of the Baja California peninsula. I will discuss the distinct species of sharks in the assemblage, the types of remains, the contexts they were found in, and incorporate what is known about each species to interpret the diverse types of relationships humans have with sharks at Cedros. By incorporating human-behavioral ecology and symbolic behavior …

Hibernating Tricolored Bats At A Southeastern Recreation Site: Microsite Use And Public Perceptions, Rebecca Brown

All Theses

High bat mortality from white-nose syndrome (WNS) has increased the need to manage hibernation sites. Management decisions should be based on science, and when sites are accessible to the public, also need to consider human dimensions. We used Stumphouse Tunnel, a recreation site and tricolored bat (Perimyotis subflavus) hibernaculum in northwestern South Carolina, as a case study to understand potential conflicts between conservation and recreation. The population declined by 90% after the arrival of white-nose syndrome (WNS), followed by stabilization and slight increases. Because the increase was associated with more bats roosting in the publicly accessible section, a potential …

Factors That Affect Home Range Of Timber Rattlesnakes (Crotalus Horridus) In Northwest Arkansas, Bannon Gallaher

Graduate Theses and Dissertations

Conservation of animal populations requires knowledge of their habitat and spatial needs. Quantifying spatial requirements involves the analysis of home range. We examined the effects of sex, body size (SVL), body condition (log mass/log SVL), and year on home range in Timber Rattlesnakes (Crotalus horridus) in Northwest Arkansas. Individual locality data from an ongoing, 22+ year radio-telemetry study in Madison Co., Arkansas were analyzed using both minimum convex polygon (MCP) and Kernel Density Estimates (KDE). Plots of the number of sequential observations versus home range (MCP and KDE) determined that a minimum of 25 locations per individual per active season …

Predicting Groundwater Spring Locations From Topographic And Climatic Data Using Maxent Modeling, Ayten Ece Koc

USF Tampa Graduate Theses and Dissertations

The World Resources Institute reveals that 17 countries face extremely high levels of water stress. Moreover, with increasing population and industrialization, the gap between water supply and demand increases day by day around the world. Groundwater is a key freshwater source, and springs are important resources as they enable to access groundwater. Therefore, it is crucial to monitor, protect, and manage groundwater springs. The first step in spring management is to recognize and define freshwater resources and to determine the locations of groundwater springs that serve as natural discharge points. Traditionally, field studies have been employed to determine the locations …

Projecting The Effects Of Climate Change And Urbanization On Longleaf Pine Stands In The Florida Flatwoods, Lilian Grace Hutchens

Theses and Dissertations

The southeastern United States once held millions of hectares of highly connected longleaf pine ecosystem. In a dramatic range reduction, longleaf pine now occupies less than 5% of its original extent, its remnant patches existing within a matrix of human-dominated land uses. Conservation planning for longleaf pine ecosystems is complicated given the ecosystem’s reliance on fire and the broad spatial and temporal scales at which longleaf pine management must operate. Planning timelines for longleaf pine management extend into the end of the 21st century, a period during which climate, fire regimes, and land cover are all expected to change, influencing …

Environmental Drivers Of Dispersal In Black-And-White Ruffed Lemurs (Varecia Variegata), Amanda Mancini

Dissertations, Theses, and Capstone Projects

Dispersal is a fundamental aspect of primates’ lives, influencing population connectivity through gene flow, driving community structure and assembly, and having important consequences for adaptation and speciation. Primates disperse within an environmental context, with both intervening and local environmental factors affecting the motivation, capacity, timing, and success of dispersal at all phases. Direct evaluations of primate dispersal are challenging given the rarity of dispersal events and the large distances that animals often settle from their departure site, therefore indirect measures– such as the use of population genetic data– are more common.

The field of landscape genetics enables researchers to combine …

Tree Removal From An Encroached Coastal Grassland Restores Soil Bacterial Communities Before Fungal Communities, Ka Ki Law

Master's Theses

Woody species encroachment depletes historic grassland biodiversity and degrades ecosystem function around the world. In particular, the encroaching trees can shift soil properties and microbial communities, which play critical roles in plant health and global nutrient cycling. Little is known about how removing encroached trees affects soil ecosystems, however. Over the last century, Pinus radiata and Hesperocyparis macrocarpa (non-native to the area) both encroached into coastal prairies at Rancho Corral de Tierra in California, and selected trees were removed in 2017 and 2018 to restore grassland habitats. To examine the impacts of encroachment and removal on the soil ecosystem, I …

State Level Mental Health Education Compared To Suicide-Related Behavior In Adolescents, 2019, Sonia Rao

Honors Theses

Objective: Determining correlations between state level mental and emotional health (M&E) education and suicide prevention (SP) education to suicide-related behaviors (I.e. feeling sad or hopeless, suicide ideation, making a suicide plan, suicide attempt, suicide attempt treated by medical personnel, and death by suicide) within high school adolescents aged 15-19 within the United States in 2019.

Methods: State level education policies, M&E and SP, were retrieved from the National Association of State Boards of Education (NASBE). Self-reported adolescent suicide related behaviors were retrieved from the 2019 Youth Risk Behavior Surveillance System (YRBSS). Data on deaths by suicide of youth aged 15-19 …

Carnivore And Ungulate Occurrence In A Fire-Prone Region, Sara J. Moriarty-Graves

Cal Poly Humboldt theses and projects

Increasing fire size and severity in the western United States causes changes to ecosystems, species’ habitat use, and interspecific interactions. Wide-ranging carnivore and ungulate mammalian species and their interactions may be influenced by an increase in fire activity in northern California. Depending on the fire characteristics, ungulates may benefit from burned habitat due to an increase in forage availability, while carnivore species may be differentially impacted, but ultimately driven by bottom-up processes from a shift in prey availability. I used a three-step approach to estimate the single-species occupancy of four large mammal species: mountain lion (Puma concolor), coyote …

Habitat Value Of Stormwater Retention Basins For Avian Species In The South San Francisco Bay, Maya D. Briones

Master's Theses

Shorebird populations are declining worldwide due to habitat fragmentation, degradation, and loss. A potential, understudied set of resources that might be used to benefit waterfowl, especially breeding shorebirds, are artificial wetlands such as stormwater retention basins. This study evaluated the habitat value of stormwater retention basins in the San Francisco Bay Area by measuring species abundance, richness, and behavior. Seston, or biota and other suspended material, was collected and tested for mercury contents. Additionally, the habitat features within each basin were recorded and tracked for changes over a year. The stormwater retention basins supported a higher diversity of bird species …

Comparison Of Water Column Properties Derived From An Autonomous Underwater Vehicle And Satellite Based Sources In Lake Michigan, David Bennion

Master's Theses and Doctoral Dissertations

Autonomous underwater vehicles (AUVs) are an emerging technology increasingly being employed in geoscience and ecosystem research in the Great Lakes, capitalizing on their ability to sample large areas fitted with a variety of sensors. Previous to AUV use, chlorophyll measurements were either collected at discrete locations accessed by boats or derived from satellite remote sensing data. An advantage of AUVs is the ability to detect the presence of subsurface formations such as a deep chlorophyll layer or directly measure features such as the extent of the photic zone, which provides the opportunity to compare these in situ measured features to …

Using Extended Two-Step Floating Catchment Area To Map Children’S Level Of Access To Physical Books In West Virginia, Heather A. Maxey

Graduate Theses, Dissertations, and Problem Reports

The state of West Virginia lacked a comprehensive, in-depth analysis of the availability of physical books across the state. Access to reading material is vital to a child’s educational development as well as lifelong learning beyond childhood. To guide policy decisions and planning for outreach which addresses reading levels and beyond, I mapped levels of access stemming from socioeconomic barriers, spatial barriers, and an integrated index of both types of barriers. To map spatial access, I utilized a modified Extended Two-Step Floating Catchment Area model, deriving techniques from Hong et al’s 2023 article addressing access for health care in WV. …

The Evergreen Challenges Of Healing: An Evaluation Of Urban Green Space In Harambee, Kacee Ochalek

Theses and Dissertations

Urban green space initiatives have emerged in low- and middle-income cities as a solution to disinvestment, the production of more positive public health metrics, and a tool of community engagement. While the production of urban greening provides ample room for applause, The City of Milwaukee’s Healing Spaces Initiative model regarding the ongoing construction of green space and the implementation of maintenance creates challenges that perpetuate racist capitalistic notions of the neoliberal project. This paper presents reports from participant observation, document analysis, and 17 qualitative interviews with representatives of the City of Milwaukee, community partners, garden leaders, and residents. The data …

A Quantitative Examination Of The Influence Of Social And Structural Communication Variables On The Social Connectedness Of People Experiencing Homelessness, Shawn Michael Evans

Graduate Theses and Dissertations

This thesis examined the influence of social and structural communication variables on the perceived social connectedness of people experiencing homelessness in the Northwest Arkansas (NWA) and Joplin, Missouri areas. This study employed the ecological perspective of communication infrastructure theory (CIT; Ball-Rokeach et al., 2001) and a communication perspective which envisions communicative interaction as constitutive of social experience. Using survey data from 166 participants, this study examined 11 research questions and hypotheses drawn from extant literature on homelessness, social connectedness, and CIT. ANOVAs, t-tests, and hierarchical multiple regression analyses revealed a complex relationship between individuals and the communicative environment. This study …

Studies Of Roseau Cane Dieback In The Lower Mississippi River Delta Based On Remote Sensing Data Including Landsat, Worldview, And Drone, Nan Shang

LSU Doctoral Dissertations

This research focused on the Roseau cane (Phragmites australis) dieback assessment in the lower MRD of Louisiana and introduced a comprehensive and systematic multi-source remote sensing method for assessing wetland and Roseau cane dieback and habitat dynamics analysis from three scale levels from large-scale to small scale.

Large-scale historical vegetation/land change analyses were conducted in the lower MRD based on Landsat in the past two decades (2001 - 2021). A strong increasing trend of vegetation was found since 2005. Around 51 km² ofdieback area was detected which accounts for 11% of the overall vegetation coverage. This research …

The Developmental Importance Of Napping In Preschool Children, Adam T. Newton

Electronic Thesis and Dissertation Repository

Most children cease napping between 2- and 5-years-old. Little is known about the predictors or outcomes related to this cessation, or the interrelation of different components of nap behavior. Four empirical studies were conducted to investigate the developmental importance of napping among preschool children.

Studies 1 and 2 used a large, longitudinal sample of Canadian children to investigate the predictors (Study 1) and outcomes (Study 2) related to early nap cessation. Early nap cessation was defined as stopping daytime sleep before three years old. In Study 1, parents reported on their own, child, and family functioning at two timepoints (0-1 …

Motor Vehicle Collisions In London, Ontario: Estimating The Influence Of The Built Environment And Children’S Potential Exposure, David Lui

Electronic Thesis and Dissertation Repository

Motor vehicle collisions are the leading cause of death for children and youth worldwide. To effectively target interventions to improve child safety, it is necessary to identify where motor vehicle collisions occur most often and what factors make these areas more hazardous. Study #1 maps collisions in London, Ontario (2010-2019) and identifies hotspots using a network kernel density estimation method within a GIS. Logistic regression analysis revealed that bike lanes were negatively associated with hotspots, while sidewalks were positively associated. Study #2 estimated children’s risk of being exposed to a motor vehicle collision while commuting to and from school, by …

Investigating The Relationships Between Socioeconomic Status, Kratom Legislation, And The Covid-19 Pandemic On Opioid Overdose Mortality In The United States., Lyndsey Blair

Electronic Theses and Dissertations

Background: 585,000 people have died from an opioid overdose in the US between 1999 and 2020. The current opioid epidemic has been described as a quadruple wave of overdoses, due in part to the changes in prescription and illicit opioid supply as well as the underlying social and structural factors that led to a subsequent increase in demand. In order to mitigate the opioid epidemic through prevention and protection strategies, we must first understand the social and structural factors that are driving the increase in opioid misuse and abuse. To better understand the socioeconomic factors, we described socioeconomic profiles of …