Digital Commons Network^™

Federal Government Shutdowns And Gateway Communities: Impacts On Businesses, Communities, And Workers’ Perceptions And Attitudes, Dean W. Zakrzewski

Landscape Architecture Undergraduate Honors Theses

This study aims to answer a presented gap in the literature on how gateway community workers and businesses are directly impacted by federal government shutdowns. Three gateway communities were selected as case-study communities for this research based on a set list of criteria, including size, proximity to urban centers, geographic context, and the prominence of their associated park. The selected communities are Bar Harbor, Maine; Estes Park, Colorado; and Moab, Utah. Community profiles were drafted for each community to understand them from a contextual level, including the breakdown of their workforce and other general descriptions of their communities. A combinational …

Adapting To Climate Change: Outdoor Recreation Impacts In New Hampshire, Visitor Coping Behaviors, & Provider Management Strategies, Madeleine Smith

Doctoral Dissertations

As of 2023, outdoor recreation participation in the United States (U.S.) reached a 15-year high, generating $1.2 trillion in economic output and supporting 5 million jobs. Concurrently, the contiguous U.S. experienced earth surface temperatures averaging above the 20th-century norm for the 27th consecutive year. Climate change presents increasing challenges for outdoor recreation, particularly in the Northeast and North Central U.S., where seasonal shifts, extreme weather events, and resource degradation are projected to acutely impact recreation patterns and management needs. New Hampshire (NH), where nearly 30% of the state is safeguarded for public use, relies heavily on outdoor recreation. As of …

Mortal Rivers: A Case Study Analysis Of Indigenous Water Sovereignty Within The Penobscot And Lakota Nations, 19th Century To Present, Moya S. Stringer

Honors Theses

Indigenous water sovereignty has long been a contested problem within the continent of Turtle Island. In 2016, the Lakota Nation globalized the message Water is Life through their movement against the Dakota Access Pipeline, an oil infrastructure that would put one of the continent’s largest watersheds at risk. The revolutionary fervor of the Water is Life movement travelled all the way to the Penobscot Nation in the Dawnland, a place we now call Maine. In an adjacent vein to the Lakota, the Penobscot people have spent the 21st century addressing damming projects and rampant pollution from the 1900s in a …

Teaching Wonder: Essays And Reflections From The National Parks System, James A. Hubbard

Dartmouth College Master’s Theses

In The Sense of Wonder (1965), acclaimed environmentalist Rachel Carson offers guidance for adults helping children explore nature and cultivate an enduring interest in the outdoors. Fondly drawing upon excursions in coastal Maine with her grandnephew Roger Christie, Carson illustrates the powerful impact of simply accompanying children in nature and letting their curiosity and questioning guide the adventure. Despite her immense knowledge in earth sciences, she made a concerted effort not to share technical vocabulary with Roger, believing that doing so might belittle his joy in their surroundings. Her work has inspired me throughout my career as a fourth grade …

Application Of Advanced Mathematical Approaches To The Interpretation Of Remote Sensing Observations Of The Surface Of Mars, John Randall Christian

Arts & Sciences Graduate Student Theses and Dissertations

Spectroscopic imagers have been used to analyze the surface of Mars at varying spatial scales in several distinct modalities, each of which provides different information about surface geology and geochemistry. In this dissertation, we take a closer look at two such spectroscopic imagers: the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) on board the Mars Reconnaissance Orbiter and the Planetary Instrument for X-ray Lithochemistry (PIXL) on board the Mars 2020 rover Perseverance. We apply new mathematical models to data collected by CRISM to infer physical properties from a complex (and therefore underutilized) portion of the spectrum, and to data collected …

Exploring Tensions Between Two Maine Landscapes: Toxic And Pristine, Caitlyn Elizabeth Hanley

Standard Theses

This thesis juxtaposes a historical account of environmental toxicity in Maine against the popular notion of Maine as a “Vacationland.” Maine is famous globally for its pristine aesthetics, iconic coastline, and vast wilderness. Because of this, tourism is amongst the largest economic sectors for Maine, much different from the complex industrial history that once drove the economy and built a strong foundation for the state. Public discourse advertises Maine as a “Vacationland,” capitalizing on its natural features while ignoring and even marginalizing the toxic history of Maine which is still impacting communities today. This idyllic visage of Maine contradicts the …

Time Series Analysis Of Pseudo-Nitzschia Species Composition, Domoic Acid, And Environmental Conditions In The Gulf Of Maine From 2013-2020, Christina Chadwick

USF Tampa Graduate Theses and Dissertations

Phytoplankton are abundant in both fresh and marine waters and can form harmful algal blooms (HABs) by producing potent toxins that have devastating effects on human, wildlife, and economic health. The HAB-forming diatom genus, Pseudo-nitzschia, occurs globally and approximately half of the 59 currently identified species can produce the neurotoxin, domoic acid (DA). DA accumulates in shellfish and finfish and can cause Amnesic Shellfish Poisoning (ASP) in humans and DA Poisoning (DAP) in several species of wildlife, resulting in severe neurological dysfunction and mortality. Along with these health threats, DA toxicity is a major economic threat for shellfish and fish …

"Always A Rocky And Rippling Stream": The Penobscot River And War, 1604-1869, Mary Moody Mclean

Theses and Dissertations

This paper broadly examines how rivers can be used as a pawn in war and, more specifically, how the Penobscot River, located in Penobscot County, Maine, influenced significant battles in America and the fabric of the developing nation due to its geographical location and geological development. This analysis focuses on one critical aspect of the Penobscot River that motivated attacks: the fur, fish and lumber trades, all of which were established due to the proximity of the coast and how the land developed during the Holocene era.

My thesis illustrates how North Americans, British and French used the Penobscot River …

"It’S Just Another Thing”: Perceptions Of Well Water Quality And Barriers In An Arsenic Hot Spot, Linzy Rosen

Honors Theses

Privately owned water is the primary source of drinking water for 43 million Americans. Although residential or private wells are susceptible to a variety of contaminants, the Safe Drinking Water Act of 1974 positions individuals as responsible for the testing, remediation, and management of this water. Despite the elevated presence of arsenic in Maine, which is linked to various cancers, cardiovascular disease, and neurological damage, little is known about how private well owners perceive the safety and quality of their own water.

This study takes a qualitative approach to understanding concerns and opinions by conducting semi - structured interviews with …

Search And Rescue Missions On The Rise In U.S. National Parks, Sahalie Donaldson

Capstones

Across the country the number of search and rescue missions in national parks has been creeping up since 2018. While the number of missions being undertaken are up overall, some parks in particular have seen a dramatic spike in the number of people requiring rescue services, straining a patchwork, often volunteer-based search-and-rescue system. Some parks like Maine’s Acadia National Park, Zion National Park in Utah and the Grand Canyon National Park even experienced their busiest years to date in regards to the number of search and rescue calls they received.

Both former and current park rangers who go on search …

Novel Quantification And Localization Of Water And Solute Transporters In The Tissues Of The Spiney Dogfish (Squalus Acanthias), Tolulope B. Ojo

College of Graduate Studies: Theses & Dissertations

The dogfish, Squalus acanthias is a marine cartilaginous elasmobranch found in the North Atlantic and Pacific oceans. Dogfish synthesize and excrete urea as a product of nitrogen metabolism. They also convert ammonia into urea and retain this urea, such that their plasma is isosmotic or slightly hyperosmotic to the surrounding seawater. To facilitate the regulation of body fluid and to maintain ionic concentrations and osmotic pressure, Dogfish use ion and solute transporters (e.g., NCC, UT-1) and aquaporin water channel proteins. Studies have identified some of the aquaporin genes in the elasmobranch genome, but their functions are mostly uncharacterized. Recent transcriptomic …

Using Social Media To Assess The Impact Of Weather And Climate On Visitation To Outdoor Recreation Settings, Emily J. Wilkins

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

When people post photos on social media, these photos often contain information on the location, time, and date the photo was taken; all of this information is stored as metadata and is often never seen or used by the individuals posting the photos. This information can be used by researchers however, to understand the total number of visitors to parks and protected areas, as well as specific places people visit within those parks and protected areas. The first study in this dissertation reviews all the ways social media has been used to understand visitation and visitors’ experiences in parks. Researchers …

Genome-Wide Rnai Screen Of Kinase Pathways Regulating Rrt-1 Constitutive Cytoprotective Gene Expression, Jacob Bowie

Master's Theses

Environmental stress disrupts cellular homeostasis leading to proteostasis disruptions which must be correct by rapid reprogramming of transcription and translation mediated by the translation machinery of which tRNA and aminoacyl tRNA synthetases are particularly important. Our aim in this study was to conduct a genome-wide RNAi kinase screen of a long-lived and stress-resistant rrt-1(gc47) (MC240) C. elegans mutant that constitutively, under naïve conditions, expresses a GFP reporter for gpdh-1, which is required for survival during hypertonic stress, but not expressed under naïve, non-stress conditions. Our approach was to administer RNAi by feeding, and we used 382 RNAi clones, including genome-wide …

Selling Eden: Economic Development And Conservation In Mount Desert Island And Acadia National Park, Christina Gail Arflack

Electronic Theses and Dissertations Archive

This history of Mount Desert Island, Maine and Acadia National Park examines the issues and conflicts that arose as Mount Desert Island and the town of Bar Harbor grew from a quiet coastal village into a resort community. By tracing the developmental history of the island, this work places the creation of the national park within the context of decades of preceding development of the community as a tourist attraction. This region, now known for its beauty and the wealthy visitors it draws, hosted competing factions of local citizens and summer residents who often held disparate views regarding the islands …

Necessary Evil : How Student Loans Are Incorporated Into People's Everyday Lives, Abby J. Stivers

Legacy Theses & Dissertations (2009 - 2024)

Student loan levels in the United States have risen since their inception by the Federal Government in 1958 and they continue to rise today. Economists and the general public are at odds about what this means. The public narrative, as evidenced by news coverage, op-eds, social movements and polling data, suggest that student loans have become a “crisis” that negatively impacts the lives of young Americans. Economists, meanwhile, argue that there is no “crisis” with student loans. They argue instead that the notion of “crisis” is fueled by the fear of the growing dollar amount that student loans represent and …

Finding Novel Therapeutics For Blood Cancer Chemotherapy And Immunotherapy, Jin Li

Doctoral Dissertations

This thesis focuses on identification and development of novel small molecule therapeutics for blood cancer. The studies presented herein examine two classes of novel compounds with different mechanisms: tropolones as chemotherapies (Chapters II and III) and phosphoantigens as immunotherapies (Chapters IV-VII).

A library of α-tropolone derivatives was tested for anti-proliferative effects on a panel of hematological malignancies demonstrating preference towards cells of T cell lineage. Through investigating different compounds, some structure activity relationships for compound potency were determined. As a class, the mechanism of action was reliant upon the caspase pathway, p53 regulation, Akt, mTor, and iron. The α-substituted tropolones …

Quantification Of Aqp11 Paralog Expression In The Osmoregulatory Organs Of Anguilla Rostrata, Keith C. Kurt

College of Graduate Studies: Theses & Dissertations

Osmoregulation is facilitated by using an assortment of ion and water channels to assist acclimation to changing conditions and to maintain cellular homeostasis. Euryhaline fish can be found in both seawater and freshwater (SW and FW) environments. Expression of ion and water channels have been experimentally demonstrated to change as a fish acclimates to different environmental conditions. Relatively recently, a new group of water channels has been discovered that are primarily intracellular and includes aquaporin 11 (AQP11). Typically, AQPs are located on the cell plasma membrane to allow water to flow in and out of the cell by osmosis to …

Experimental Evidence That The Non-Native European Fire Ant Alters Invertebrate Communities, Madeson C. Goodman

Biology Theses

Successful non-native species can reduce native species richness through both direct and indirect competition. Many invasive ants, such as the European fire ant (Myrmica rubra), are particularly successful invaders due to their ability to form multi-nest, multi-queen “supercolonies” that appear to displace native ant and non-ant invertebrate fauna in invaded regions. Myrmica rubra has invaded the Northeastern United States, including Tifft Nature Preserve in Western New York, but its seemingly negative impacts on local invertebrate communities have only been assessed using correlative studies, making it difficult to determine whether these ants directly displace native ants and invertebrates or …

The Effects Of Nutrient Limitation On Toxin Production For The Harmful Algal Bloom Species, Pseudo-Nitzschia, In The Gulf Of Maine, Julia M. Park

Honors Theses

Pseudo-nitzschia is a pennate marine diatom that produces the neurotoxin domoic acid (DA). Domoic acid accumulates in the digestive tract of filter feeders and becomes concentrated at higher trophic levels. When DA concentrations reach critical levels, consumption of toxic shellfish can induce a condition known as Amnesic Shellfish Poisoning (ASP), which has been responsible for the deaths of marine mammals, seabirds and humans. This study worked to respond to a toxic Pseudo-nitzschia bloom in the Gulf of Maine during the fall of 2016, with the goal of quantifying and identifying Pseudo-nitzschia spp. in the bloom region and to determine the …

Evolution Of Two Genomes: Impact Of Sequence Divergence On Mitochondrial Function, Tara Zeynep Baris

Open Access Dissertations

The oxidative phosphorylation pathway (OxPhos) is the only pathway where proteins are encoded by both the mitochondrial and nuclear genomes. It is also responsible for creating the majority of ATP used by animal cells. The critical role this pathway plays in animal cells, and it’s reliance on two genomes makes it a perfect system to study the co-evolution of the mitochondrial and nuclear genomes. Using Fundulus heteroclitus, an ectotherm inhabiting a steep thermal cline along the eastern coast of the United States, I explore the effect of temperature on the evolution of this important pathway, as well as the associations …

A Guide For Assessing Older Adults’ Needs On Maine Islands, Beatrice Byrne

Muskie School Capstones and Dissertations

This template may help Maine island communities identify older adults’ needs and island resources, in order to allow older adults to age in the island communities.

Three interviews with island health leaders, one community conversation with older islanders, and one pilot test provided information about what to include in the template.

The template includes a demographic survey, guides for conducting semi-structured interviews and group conversations with older adults and caregivers, a guide and worksheet for analyzing the data, a guide for assessing community resources, a guide for dissemination, and a list of additional resources.

Dna Barcoding Reveals A New Morphotype Of The Sugar Kelp, Saccharina Latissima, Dallin Brimley, Zakery Ford, Travis Gould, Brandon Guerra, Emily Haggett, Ian Jones, Elyse Johnson, Ken Peterson, Matthew Prout

Thinking Matters Symposium Archive

Phytoplankton blooms follow predictable annual cycles in the Gulf of Maine, characterized by a large spring bloom and a smaller bloom in the fall. Marine phytoplankton form the foundation of primary production in Gulf of Maine waters, and thus community changes in composition, and abundance could have cascading effects on our coastal ecosystems.

We set out to monitor the community composition, diversity, and abundance of the spring micro-phytoplankton bloom, at a Friends of Casco Bay water quality monitoring site, in South Portland, Maine. The Gulf of Maine is experiencing accelerated warming rates, and this type of monitoring can aid in …

Methylmercury Bioaccumulation In Spotted Salamanders (Ambystoma Maculatum) In Southern Ohio, Rachel Alex Walker

Browse all Theses and Dissertations

Mercury (Hg) is a volatile element increasing in concentration in the environment as a result of anthropogenic emissions. Microorganisms can transform mercury into monomethylmercury (MMHg), the form of Hg that bioaccumulates, biomagnifies, and can harm humans and wildlife. Most studies of MMHg bioaccumulation in wildlife have focused on aquatic organisms due to consumption of fish being the primary route of human exposure to MMHg. However, organisms in terrestrial ecosystems also are exposed to MMHg that may impact ecosystem biodiversity, food-web dynamics, and organisms and ecosystem health. I investigated bioaccumulation and maternal transfer of MMHg in spotted salamanders (Ambystoma maculatum) captured …

Ecotourism Social Enterprise: Learning From The Global South, Jessica Bailey

Capstone Collection

Community-Based Ecotourism (CBET) in developing countries has become a popular solution to environmental, social, and economic issues. This study seeks to address how CBET models from the Global South could be implemented in the U.S. ecotourism context, using social entrepreneurship models. Research was completed through a variety of sources including academic journals and government databases, exploring the importance of ecotourism, and a comparison of ecotourism in the Global South to ecotourism in the Global North. The method for analysis was conducted through qualitative interviews with social entrepreneurs working in ecotourism in Uganda, Indonesia, Nepal, India, Costa Rica, Chile, and Brazil. …

The Inuit Vs. The Steamboat: Human Exhibitionism And Popular Concerns About The Effects Of The Market Revolution In The Early Republic, Ryan Bachman

Masters Theses, 2010-2019

In the early nineteenth century, a new form of human exhibitionism spread through eastern American cities. While public displays featuring live human beings had existed since the colonial era, these new shows specifically focused on Native Americans. This paper examines one such show, the Inuit Exhibition of 1820-1821, as a case study of this phenomena. Primarily through the use of contemporary newspaper accounts, this project argues that shows like the Inuit Exhibition occurred within a cultural context that legitimized the practice of human exhibitionism as a genuine, post-Enlightenment method of educating citizens about the natural world. Furthermore, so-called “Indian Exhibitions” …

Environmental Toxicants And Unsaturated Fatty Acids Alter Toxicant Sensitivity And Allocation Of Polar Lipids In Daphnia Magna, Namrata Sengupta

All Dissertations

Daphnia is a commonly used test organism in toxicology, ecology, and evolution. HR96 is a CAR/PXR/VDR ortholog in invertebrates, and a promiscuous endo- and xenobiotic nuclear receptor involved in acclimation to toxicants. Daphnia HR96 is activated by chemicals such as atrazine and linoleic acid (LA) (n-6 fatty acid), and inhibited by triclosan and docosahexaenoic acid (DHA) (n-3 fatty acid). HR96 is also a key regulator of Magro, Niemann Pick genes, and other genes involved in cholesterol and triacylglycerol uptake, metabolism, and transport. We hypothesized that Daphnia magna exposed to HR96 activators will increase their lipid resources and in turn either …

The Response Of Molting Homarus Americanus To Ocean Acidification Projections, Erin Lyn Mclean

Open Access Master's Theses

Marine calcifiers, especially those in their larval and juvenile stages, are thought to be most vulnerable to ocean acidification (OA) due to the effects of carbon dioxide (CO₂) on growth and shell mineralogy. However, recent evidence is contradictory. We monitored molting activity, length and weight in early benthic phase juvenile American lobster Homarus americanus (Milne-Edwards 1837) under elevated CO₂ conditions (500 µatm, 1100-1300 µatm, and 2000-2700 µatm) to determine how OA affects growth at this life stage. Molted shells were analyzed for magnesium (Mg²⁺) and calcium (Ca²⁺) content by laser ablation inductively coupled …

E Pluribus Unum: What Individual Whales Can Tell Us About Enigmatic Species Distribution And Social Organization, Tanya Marie Lubansky

Dissertations

Large whales have historically been difficult to study and many aspects of their ecology remain unknown especially at the long -term population level. The ability to identify individual whales based on natural markings provides the opportunity to track individuals over time and space; this data may offer more insight into the ecology of whales than previously imagined. This study demonstrates use of photo-identification data to model both social structure and habitat selection, minimizing the need for invasive research and greatly increasing the sample size used in such endeavors. A conditional logistic model is written for a 20-year sightings dataset on …

Molecular Characterization Of Hemoglobin Protein In Larvae Of 4th Instar Chironomidae For Evaluating Environmental Quality, Jun Taek Oh

Seton Hall University Dissertations and Theses (ETDs)

Studying environmental quality is a challenging task. It is a complicated exercise since the environment is constantly influenced by numerous variables such as climate change, anthropogenic activities, and unexpected natural disasters. Traditionally, exposure to chemical pollutants depended on chemical and physical analysis of environmental media. Unfortunately, this approach has not taken into consideration bioavailability of the chemical(s) of interest to exposed organisms and/or modification of the chemical (bioactivation/detoxification) by the organism. Benthic macroinvertebrates (BMIs) have been chosen as bioindicators for numerous environmental biomonitoring programs geared towards the assessment of aquatic ecosystems. Biomonitoring requires a more subtle measure – a biomarker …

Application Of A Bioenergetics Framework For Assessing Sub-Lethal Effects Of Pollutants In The Freshwater Mussel Elliptio Complanata, Christopher G. Goodchild

All Theses And Dissertations

Although biomarkers are frequently used to assess sublethal effects of contaminants, a lack of mechanistic linkages to higher-level effects limits the predictive power of biomarkers. Bioenergetics has been proposed as a framework for linking cellular effects to whole-animal effects. We investigated sublethal effects of exposure to wastewater treatment facility effluent in freshwater mussels in situ, thereby capturing ecologically relevant exposure conditions. Our study focused on the energetic biomarker AMP-activated protein kinase (AMPK), while also considering more traditional biomarkers like heat shock proteins (HSP70), and antioxidant enzymes (i.e., superoxide dismutase (SOD), glutathione-S-transferase (GST)). We examined biomarkers at mRNA and protein levels. …