Environmental Studies Commons^™

Effects Of Variable Density Thinning On Spatial Patterns Of Overstory Trees In Mt. Hood National Forest, Emma Huston

Environmental Science and Management Professional Master's Project Reports

Variable density thinning (VDT) is a method of restoration thinning that attempts to increase ecosystem resilience and spatial heterogeneity in forest stands to more closely resemble mosaic-like patterns characteristic of late-successional forests, which consist of clusters of multiple trees, individual trees, and gaps. This study examines the spatial patterning of overstory trees resulting from VDT of conifer forests in Mt. Hood National Forest in the western Cascade Mountains and compares these patterns with reference conditions. Stem maps were created from field surveys of study plots within one mature stand and six thinned stands designated as Late-Successional Reserve (LSR) with varying …

Contents, Discovery Editors

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.

Letter From The Dean, Deacue Fields

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

No abstract provided.

A Review Of Heat Stress Policies In The Context Of Climate Change And Its Impacts On Outdoor Workers: Evidence From Zimbabwe, Bigboy Ngwenya, Jacques Oosthuizen, Martyn Cross, Kwasi Frimpong, Cynthia N. Chaibva

Research outputs 2014 to 2021

Record-breaking summer heat events are increasing in frequency in Zimbabwe and 2016 was a particularly hot year with the country experiencing its worst heat wave event in decades. Currently, Zimbabwe has no coordinated public health response to deal with heat wave events and no specific data on heat-related morbidity and mortality. The country has no legislation for protecting workers against environmental heat exposure, particularly those most vulnerable who are employed in the informal sector. These workers are also at risk due to their outdoor work environments. The article outlines the state of climate and heat stresses in Zimbabwe, as benchmarked …

Conspicuously Concealed: Revision Of The Arid Clade Of The Gehyra Variegata (Gekkonidae) Group In Western Australia Using An Integrative Molecular And Morphological Approach, With The Description Of Five Cryptic Species, Luke Kealley, Paul Doughty, Mitzy Pepper, J. Scott Keogh, Mia Hillyer, Joel Huey

Research outputs 2014 to 2021

The methods used to detect and describe morphologically cryptic species have advanced in recent years, owing to the integrative nature of molecular and morphological techniques required to elucidate them. Here we integrate recent phylogenomic work that sequenced many genes but few individuals, with new data from mtDNA and morphology from hundreds of gecko specimens of the Gehyra variegata group from the Australian arid zone. To better understand morphological and geographical boundaries among cryptic forms, we generated new sequences from 656 Gehyra individuals, largely assigned to G. variegata group members over a wide area in Western Australia, with especially dense sampling …

Restoration Of Mauri (Life-Force) To Okahu Bay: Investigation Of The Cultural, Social, And Environmental Restoration, Emily Freilich

Pomona Senior Theses

This thesis investigated the restoration of mauri (life-force) to Ōkahu Bay, Auckland New Zealand. Ōkahu Bay is part of the land and waters of Ngāti Whātua Ōrākei, a Māori hapū (sub-tribe). Ngāti Whātua Ōrākei has been driving the restoration, restoring Ōkahu Bay based on their worldview, visions, and concerns. This vision and control of the restoration process allows them to bring in the hapū in sustainable engagement and have the long-term vision and commitment necessary for self-determination. However, while there has been progress with projects and improved decision-making authority, hapū members are still not seeing their whānau (family) swimming in …

Restoration Of Mauri (Life-Force) To Ōkahu Bay: Investigation Of A Community Driven Restoration Process, Emily Freilich

Pomona Senior Theses

This thesis investigated the restoration of mauri (life-force) to Ōkahu Bay, Auckland New Zealand. Ōkahu Bay is part of the land and waters of Ngāti Whātua Ōrākei, a Māori hapū (sub-tribe). Ngāti Whātua Ōrākei has been driving the restoration, restoring Ōkahu Bay based on their worldview, visions, and concerns. This vision and control of the restoration process allows them to bring in the hapū in sustainable engagement and have the long-term vision and commitment necessary for self-determination. However, while there has been progress with projects and improved decision-making authority, hapū members are still not seeing their whānau (family) swimming in …

Using Renewable Energy To Increase Tribal Sovereignty: A Feasibility Study For A Biomass Energy Plant On The Cocopah Reservation, Lauren Katrina D'Souza

CMC Senior Theses

Native American reservations in the United States are often located on mineral-rich lands, making them a target for fossil fuel development in already socioeconomically disadvantaged areas. As environmentally damaging as they are, coal and oil industries can bring invaluable jobs and money to isolated reservations, causing tribes to rely on fossil fuels for mere economic survival. In these instances of corporations or the federal government exploiting Native American labor and land, tribes lose the most fundamental principle of tribal governance: tribal sovereignty. Replacing fossil fuels and securing energy independence with a stable, renewable energy source is key to reclaiming that …

Cooperative Conservation To Enhance Human–Wildlife Interactions, Terry A. Messmer

Human–Wildlife Interactions

This is the editors commentary

Can The Vaquita Be Saved From Extinction?, Gerardo Rodríguez-Quiroz, Wenceslao Valenzuela-Quiñonez, Héctor A. González-Ocampo, Alfredo Ortega-Rubio

Human–Wildlife Interactions

The vaquita (Phocoena sinus) is considered the world’s most endangered marine mammal. It is the smallest member of the porpoise family endemic to the upper part of the Gulf of California. The current population is estimated at less than 30 individuals. The primary reasons for the species decline includes limited habitat and incidental mortalities associated with illegal gillnet fishing activities. Since 2008, the Mexican government has taken environmental and economic actions to protect the vaquita’s focusing in reducing by-catch deaths to zero. In 2015, a federal Agreement decreed by the Secretaría de Agricultura, Ganadería, Desarrollo Rural, Pesca y …

A Call For Proactive Human–Bear Conflict Mitigation, Annabella R. Helman

Human–Wildlife Interactions

This commentary serves as a call to action for the creation of proactive mitigation efforts to lessen human–bear conflict based on comprehensive predictive data models.

Zoning And Complementary Incentives To Protect Farmland: A Case For Missoula County, Kaitlin Mccafferty

Graduate Student Theses, Dissertations, & Professional Papers

Urban sprawl reflects an inefficient use of land that diminishes both rural landscapes and quality of life turning farms, ranches and open space into siloed suburban communities. This results in less walkable cities with more traffic and air pollution, among other negative consequences. Farmland constitutes a particularly important resource that often faces degradation or loss due to sprawl. Higher quality agricultural soils are particularly desirable for development because they are flat and well-drained. Farmland is also important for urban communities concerning food security, environmental health, and economic well being. As American cities continue to grow, farmland around urban areas has …

Environmental Links To Ectopic Kidney Diseases, Firas Alhasson

Theses and Dissertations

Nonalcoholic fatty liver disease (NAFLD) is the most common liver disease in the western culture and worldwide. Its morbidity has been raising and it has become a burden on the public health. NAFLD is associated with other metabolic diseases such as Diabetic Mellitus and hypertension. NAFLD is a wide spectrum of symptoms, from an accumulation of fat in the liver (cirrhosis) to production of scar tissue (Fibrosis). The liver along with other distal organs such as the kidney and cardiovascular system can be damaged as ectopic manifestations of NAFLD. Contamination of drinking water with Cyanobacterium toxin (Microcystin) and water disinfection …

Analyzing Stakeholders’ Workshop Dialogue For Evidence Of Social Learning, Amanda L. Bentley Brymer, J. D. Wulfhorst, Mark W. Brunson

Environment and Society Faculty Publications

After much debate and synthesis, social learning scholarship is entering an era of empirical research. Given the range across individual-, network-, and systems-level perspectives and scales, clear documentation of social learning processes is critical for making claims about social learning outcomes and their impacts. Past studies have relied on participant recall and concept maps to document perceptions of social learning process and outcome. Using an individual-centric perspective and importing ideas from communication and psychology on question-answer learning through conversational agents, we contribute an expanded conceptual framework and qualitative analytical strategy for assessing stakeholder dialogue for evidence of social learning. We …

Noninvasive Collection Of Saliva In Panthera Leo : Creation And Validation Of A Novel Technique For Health Assessment In Captive African Lions (Panthera Leo), Elizabeth Sgambelluri

Antioch University Dissertations & Theses

Very little research exists concerning direct correlations between alterations in stress stimuli and direct effects on carnivore physiology. Many studies have researched and documented what factors correlate to increased stress levels in predator species. Lacking, however, are studies observing the specific physiologic influences of increased glucocorticoid concentrations in those individuals. Furthermore, methods for monitoring and assessing health or immune function in many carnivore species often involve invasive techniques, such as physical restraint, blood sampling, and chemical immobilization. This study aimed to create, evaluate, and describe a new device for noninvasive collection of saliva for health assessment. The device itself was …

Smallholder Farmers, Environmental Change And Adaptation In A Human-Dominated Landscape In The Northern Highlands Of Rwanda, Apollinaire William

Antioch University Dissertations & Theses

Climate change and crop intensification are key challenges to the livelihoods and wellbeing of the majority of rural smallholder farmers in developing countries, particularly in human-dominated, climate-sensitive landscapes such as the northern highlands of Rwanda where issues of fluvial floods, soil erosion pose serious threats to the livelihoods of smallholder farmers. In this mixed methods study conducted between August and December 2015, I explored smallholder farmers’ perceptions by examining what barriers might hinder the process of agroforestry adoption by smallholder farmers, what socio-economic and physical factors and attitudes influence crop choices, motivations for smallholder farmers’ willingness to plant trees within …

Influences Of Forest Edges And Human Activities On The Dry Season Ranging Patterns Of Chimpanzees (Pan Troglodytes Schweinfurthii) In Nyungwe National Park, Rwanda, Enathe Hasabwamariya

Antioch University Dissertations & Theses

Great apes, our closest biological relatives are threatened globally by the increasing anthropogenic pressures on their habitat. The major threats to the eastern chimpanzees (Pan troglodytes schweinfurthii) are hunting for bush meat and illegal trade in chimpanzee infants, habitat loss or fragmentation and disease transmission (IUCN, 2010). Nyungwe National Park (NNP), Rwanda has a population of chimpanzees that face several threats, including hunting for bushmeat, habitat degradation from forest fires and human-wildlife conflicts, and much of these impacts are concentrated at forest edges. The main objectives of this research were to assess the use of forest edges by chimpanzees along …

Searching The Internet To Estimate Deer Population Trends In The U.S., California, And Connecticut, G. Webb

Faculty Research, Scholarly, and Creative Activity

Information for decision making may be publicly available, but costly to obtain. As an experiment in environmental scanning, the internet was searched on a daily basis over several years to collect information and provide analysis related to decisions on deer management. The process discovered that, contrary to common assumptions, the U.S. deer population has apparently been falling since about the year 2000 based on analysis of available state data that had not been aggregated. In some cases, state population estimates were created using standard procedures on available data. Results indicate that differences in survey methods appear to be relatively constant …

Learning To Live With Wolves: Community-Based Conservation In The Blackfoot Valley Of Montana, Seth M. Wilson, Elizabeth H. Bradley, Gregory A. Neudecker

Human–Wildlife Interactions

We built on the existing capacity of a nongovernmental organization called the Blackfoot Challenge to proactively address wolf (Canis lupus)-livestock conflicts in the Blackfoot Valley of Montana. Beginning in 2007, wolves started rapidly recolonizing the valley, raising concerns among livestock producers. We built on an existing program to mitigate conflicts associated with an expanding grizzly bear population and worked within the community to build a similar program to reduce wolf conflicts using an integrative, multi-method approach. Efforts to engage the community included one-on-one meetings, workshops, field tours, and regular group meetings as well as opportunities to participate in …

Illegal Wildlife Hunting And Trade In Southern Belize: An Assessment Of Impacts And Drivers, Blakely Rice

Capstone Collection

The use of wildlife as a resource is a common practice in all countries around the world, however, illegal activities are contributing to various environmental and social altercations amongst the involved communities and individuals, both directly and indirectly. This has led to the generalized global narrative on illegal wildlife hunting and trade as a “good vs. bad” convention. Although legal frameworks are in place to manage hunting and trade sustainably, governments and organizations often find themselves struggling to protect wildlife from illegal hunters, often facing dangerous situations thus the establishment of militarized conservation units. To date, most of the focus …

Science And Sentiment: Affecting Change In Environmental Awareness, Attitudes, And Actions Through The Daily Nature Project, Elizabeth D. Haynes Poronsky

The Transdisciplinary STEAM+ Journal

Knowledge about what motivates pro-environmental behavior is important to organizations that seek to encourage environmental stewardship. Research suggests that targeting emotions and beliefs about nature can be more effective in changing environmental actions than increasing knowledge. Daily Nature, a site on the social media platform Facebook, features a daily nature photograph, a quote from a notable historical person and a related lyrical written passage. The popularity of this site lends credence to the appeal of interdisciplinary formats, and underscores the benefits of encouraging emotional and aesthetic ties to nature.

Effect Of Metal Ion Substitution On Electrochemical Properties Of Cobalt Oxide For Energy Applications, Dalal Alqahtani

Electronic Theses & Dissertations

Metal oxides are being used for various applications, such as batteries, supercapacitors, and catalysts. This research is mainly to produce high-performance energy storage devices capable of working at high temperatures and causing no pollution in the environment. To this end, the effect of metal ion substitution on the electrochemical properties of Co₃O₄ for energy applications was studied. Different metal oxides, such as FeCo₂O₄, MnCo₂O₄, Co₃O₄, NiCo₂O₄, CuCo₂O_4, and ZnCo₂O₄, were synthesized using a hydrothermal …

Greening The Gateway Cities: Summer Internship With The Clark University Human Environment Regional Observatory (Hero) And Massachusetts Department Of Conservation And Recreation (Dcr), Zhiwen Zhu

Sustainability and Social Justice

This report provides a detailed account of my internship experience with the Clark University Human-Environment Regional Observatory (HERO) and Massachusetts Department of Conservation and Recreation (DCR) in the summer of 2017. This internship concerns the urban tree health assessment in three ‘Greening the Gateway’ cities in Massachusetts. During the internship, I conducted tree survey field work, database management, mapping, tree survey data analysis and urban tree plantation benefits microclimate simulation. During the internship I worked with the professors and students at Clark University and University of Massachusetts, Amherst, and the staff from Department of Conservation and Recreation (DCR), Worcester Tree …

Horticulture For Pollinator Conservation, Carter M. Westerhold

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Pollinators worldwide are declining. Consequently, the agricultural and ecological services these insects provide are in danger of being lost. Land use intensification, via urbanization, has greatly influenced this decline in pollinators. Luckily, through targeted horticultural practices, stable populations of pollinators can be sustained within urban areas. The horticultural practices of planting diverse floral resources and managing pollinator habitat in urban areas can sustain these populations. Two studies were conducted with the intent to identify horticultural knowledge gaps that could be reduced to aid in pollinator conservation efforts. First, a study to compare Nebraska native and non-native ornamental plants was conducted. …

Evaluating Social Network Dynamics Of Bigg’S Killer Whales (Orcinus Orca) And Vessel Traffic Within A Transboundary Region: Implications For Conservation Management, Courtney Smith

Dissertations

The social lives of animals are defined by group dynamics based on the nature and strength of associations and movements between individuals, often resulting in highly complex and interconnected social networks. However, understanding of how environmental variables may shape this structure is poorly understood. Within the inland waters of Washington State and southern Vancouver Island, British Columbia, mammal-eating Bigg’s (transient) killer whales occur in relatively small, but stable social groups. Group size and occurrence in recent years has increased, coinciding with a growing whale watching industry. Given the central importance of the social network within killer whale population dynamics, such …

Philosophy Bakes No Bread, Babette Babich

Articles and Chapters in Academic Book Collections

Philosophy Bakes No Bread

Far from baking bread, far from practical applicability, philosophy traditionally sought to explain the world, ideally so. Thus, when Marx argued that it was high time philosophy “change the world,” his was a revolutionary challenge. Today, philosophy is an analytic affair and analytic philosophers seek less to explain the world than to squirrel out arguments or, more descriptively, to resolve the minutiae of this or that name problem. Faced with diminishing student demand, analytic philosophers have taken to urging that everyone from primary school students to scientists be required to study (analytic) philosophy. Just so, applied …

Coral Species Distribution And Percent Cover Of Sessile Organisms On Protected And Non-Protected Coral Reefs In Digir, Buga, Dubbir, And Kanir Kinnidup, Guna Yala, Panama, Sarah Paulson

Independent Study Project (ISP) Collection

Coral reefs are the most productive, biodiverse ecosystems in the ocean despite covering only <.5% of the ocean floor. In today’s changing climate, coral reefs face a multitude of threats including ocean warming, coral bleaching, ocean acidification, overfishing, increasing human population, and coral mining, among others. One way to protect coral reefs is to establish a marine protected area to limit damage and contamination. This study aimed to examine coral species distribution as well as percent cover of sessile organisms and substrates including coral, fire coral, algae, and sponges on protected and non-protected reefs in order to attempt to analyze the effect of protection on coral reefs in Guna Yala, Panama. Based on the data collected, protected areas had higher algae cover (P<.01, df=107), lower coral cover (P<.0001, df=138), and a higher relative abundance of corals with a “weedy” life history such as Porites astreoides (P<.05, df=80). The data also showed that uninhabited islands tended to have significantly higher average coral cover (P<.0001, df=146) and lower average algae cover (P<.0001, df=161), as well as lower relative abundance of P. astreoides (P<.01, df=134). When the protected site sampled was compared to an unprotected site that was around the same island, the protected area was found to have higher coral cover (P<.01, df=71) and lower algae cover (P<.05, df=72) than the unprotected area. Ultimately, lack of human population and protected status were found to be positive factors for coral reef health, and future study should be done to further examine the relationship between these two factors.

After The Flood: Fish Farming And Climate Change Adaptation In Chitwan, Nepal, Signe Stroming

Independent Study Project (ISP) Collection

Last summer, Nepal’s Terai region experienced some of the worst flooding in recent memory. Climate change is expected to increase the number of natural disasters that Nepal experiences in coming years, and more vulnerable demographics will be more adversely affected. Fish farming is a highly profitable and slowly growing industry based primarily in the Terai, that many believe is less vulnerable to climate-related risks than conventional forms of agriculture, and thus a possible livelihood adaptation strategy. In this study, I conducted semi-structured interviews with ten farmers in Madi, Chitwan, to understand the daily challenges and threats to fish farming, the …

An Ethnobotanical Examination Of Traditional Medicine In Ngezi Forest Reserve, Tyler Tsang

Independent Study Project (ISP) Collection

Traditional medicine is an important aspect of the both the culture and health of communities worldwide. Ngezi Forest Reserve is a protected area on Pemba Island which is part of the Zanzibar Archipelago. This forest contains a wealth of botanical diversity which includes many species of medicinal plants. Traditional healers (waganga) use these medicinal plants to heal members of the community. Interviews and forest walks with these healers were supplemented by consultations with a botanist to determine medicinal value of the forest and the surrounding areas. In compiling information from 15 healers in the area, 98 species of medicinal plants …

Hydrology And Macroinvertebrates As Biological Indicators- An Integrated Study Of The Río Zamora Watershed, Loja, Ecuador, Isabel Ryde

Independent Study Project (ISP) Collection

Water quality and access is under grave threat in Ecuador, yet remains poorly studied. Macroinvertebrates were used as biological indicators to study water quality around Reserva Natural Madrigal del Podocarpus, Loja Province, Ecuador. Data on macroinvertebrates was combined with hydrologic measurements of stream functions. Macroinvertebrate sampling was conducted from 6 sites within the Upper Río Zamora watershed. Geologic outcrops were observed along several roadcuts and stream banks. Hydrologic data was collected by measuring discharge, elevation change, and finding the highest permanent spring. The EPT index (number of EPT individuals and percentage of EPT individuals) and the BMWP/Colombia Index for macroinvertebrates …