Digital Commons Network^™

Low Secondary Risks For Turkey Vultures From A Sodium Nitrite Toxic Bait For Wild Pigs, Justin A. Foster, John C. Kinsey, Michael J. Lavelle, Kurt C. Vercauteren, Nathan P. Snow

United States Department of Agriculture Wildlife Services: Staff Publications

An acute and orally‐delivered toxic bait for wild pigs (Sus scrofa) containing sodium nitrite (SN) is being developed and tested for potential registration in the U.S. We evaluated oral toxicity of SN and risk of secondary consumption in a common avian scavenger, the turkey vulture (Carthartes aura), by 1) conducting an acute oral toxicity test (LD₅₀) for turkey vultures by oral gavage, and 2) allowing turkey vultures to feed on whole carcasses and digestive tracts of wild pigs that died from consuming SN‐laden bait. Captive tests were conducted during fall 2016 and spring 2017 in the …

A Method For Characterizing Disease Emergence Curves From Paired Pathogen Detection And Serology Data, Joshua Hewitt, Grete Wilson-Henjum, Derek T. Collins, Jourdan M. Ringenberg, Christopher A. Quintanal, Robert Pleszewski, Jeffrey C. Chandler, Thomas J. Deliberto, Kim M. Pepin

United States Department of Agriculture Wildlife Services: Staff Publications

1. Wildlife disease surveillance programs and research studies track infection and identify risk factors for wild populations, humans and agriculture. Often, several types of samples are collected from individuals to provide more complete information about an animal's infection history. Methods that jointly analyse multiple data streams to study disease emergence and drivers of infection via epidemiological process models remain underdeveloped. Joint-analysis methods can more thoroughly analyse all available data, more precisely quantifying epidemic processes, outbreak status, and risks.

2. We contribute a paired data modelling approach that analyses multiple samples from individuals. We use ‘characterization maps’ to link paired data …

Comparing Efficiencies Of Population Control Methods For Responding To Introductions Of Transboundary Animal Diseases In Wild Pigs, Nathan P. Snow, Benjamin Smith, Michael J. Lavelle, Michael P. Glow, Kayleigh Chalkowski, Bruce R. Leland, Sarah Sherburne, Justin W. Fischer, Keely J. Kohen, Seth M. Cook, Hatton Smith, Kurt C. Vercauteren, Ryan S. Miller, Kim M. Pepin

United States Department of Agriculture Wildlife Services: Staff Publications

Introductions of transboundary animal diseases (TADs) into free-ranging wildlife can be difficult to control and devastating for domestic livestock trade. Combating a new TAD introduction in wildlife with an emergency response requires quickly limiting spread of the disease by intensely removing wild animals within a contiguous area. In the case of African swine fever virus (ASFv) in wild pigs (Sus scrofa), which has been spreading in many regions of the world, there is little information on the time- and cost-efficiency of methods for intensively and consistently culling wild pigs and recovering carcasses in an emergency response scenario. We compared the …

Temporal And Spatial Influences On Fawn Summer Survival In Pronghorn Populations: Management Implications From Noninvasive Monitoring, Cole A. Bleke, Eric M. Gese, Juan J. Villalba, Shane B. Roberts, Susannah S. French

United States Department of Agriculture Wildlife Services: Staff Publications

Monitoring vital rates allowsmanagers to estimate trends in growth rates of ungulate populations. However, connecting the influence of nutrition on ungulate demography is challenging. Noninvasive sampling offers a low-cost, low-effort alternative for measuring nutritional indices, allowing for an increased understanding of the mechanistic relationships between environmental factors, nutrition, and specific population vital rates. We examined the temporal influence of intrinsic and extrinsic factors on pronghorn (Antilocapra americana) fawn recruitment. We collected fresh fecal samples from adult female pronghorn in five subpopulations spanning three sampling periods associated with critical maternal life-history stages (late gestation, early lactation, breeding season) for …

Susceptibilities And Viral Shedding Of Peridomestic Wildlife Infected With Clade 2.3.4.4b Highly Pathogenic Avian Influenza Virus (H5n1), J. Jeffrey Root, Stephanie M. Porter, Julianna B. Lenoch, Jeremy W. Ellis, Angela M. Bosco-Lauth

United States Department of Agriculture Wildlife Services: Staff Publications

We tested the ability of six peridomestic wildlife species to replicate a highly pathogenic (HP) clade 2.3.4.4b AIV (H5N1) isolated in the United States during 2022. All tested species replicated and shed virus, at least to some degree. Of the six species evaluated (house sparrows (Passer domesticus), European starlings (Sturnus vulgaris), feral pigeons (Columba livia), striped skunks (Mephitis mephitis), Virginia opossums (Didelphis virginiana), and cottontails (Sylvilagus sp.)), striped skunks and Virginia opossums shed the highest viral titers of 106.3 PFU/mL and 105.0 PFU/mL, respectively. Overall, the results of this …

Torque Teno Sus Virus 1: A Potential Surrogate Pathogen To Study Pig-Transmitted Transboundary Animal Diseases, Xiaolong Li, Brandon M. Parker, Raoul K. Boughton, James C. Beasley, Timothy J. Smyser, James D. Austin, Kim M. Pepin, Ryan S. Miller, Kurt C. Vercauteren, Samantha M. Wisely

United States Department of Agriculture Wildlife Services: Staff Publications

Understanding the epidemiology and transmission dynamics of transboundary animal diseases (TADs) among wild pigs (Sus scrofa) will aid in preventing the introduction or containment of TADs among wild populations. Given the challenges associated with studying TADs in free-ranging populations, a surrogate pathogen system may predict how pathogens may circulate and be maintained within wild free-ranging swine populations, how they may spill over into domestic populations, and how management actions may impact transmission. We assessed the suitability of Torque teno sus virus 1 (TTSuV1) to serve as a surrogate pathogen for molecular epidemiological studies in wild pigs by investigating …

Common Grackle (Quiscalus Quiscula) Predation Of A Great Lakes Piping Plover (Charadrius Melodus) Nest And Its Conservation Implications, Jade R. Arneson, Dennis A. Peloquin, Thomas G. Prestby, Sarah P. Saunders

United States Department of Agriculture Wildlife Services: Staff Publications

Common grackle (Quiscalus quiscula) was observed consuming eggs from an exclosed (protected) Great Lakes piping plover (Charadrius melodus) nest in the lower bay of Green Bay, Lake Michigan in Wisconsin, USA during June 2023. The observation, captured by a trail camera, is the first photographic documentation of grackle predation in any of the three piping plover breeding populations. This behavior adds common grackle to the suite of egg predators and has critical implications for this shorebird species, particularly in the Great Lakes region where piping plover is listed as federally endangered and common grackles are relatively …

Trichinella Murrelli Identified In Red Foxes (Vulpes Vulpes) In Pennsylvania, Usa, Jitender Dubey, Peter C. Thompson, Larissa S. De Araujo, Aditya Gupta, Sasha Kay, Oliver C. H. Kwok, Jaquin Battle, Kyle R. Van Why, Justin D. Brown, Benjamin Rosenthal

United States Department of Agriculture Wildlife Services: Staff Publications

Trichinella infections have been eliminated from pork where pigs are raised in biosecure facilities, but wildlife infections persist. Trichinella murrelli is the primary zoonotic species in wild carnivores in the United States, having been identified in several species of omnivores and carnivores. Here, we document its occurrence in seven of 21 (33.3%) red foxes (Vulpes vulpes) from six counties in Pennsylvania. Encysted Trichinella juveniles were detected in muscle squashes (< 5 g samples) of all seven foxes, and in histological sections of the tongue and limb muscle of three. Juveniles from muscle squashes were pooled and tested in a multiplex PCR capable of differentiating all Trichinella species native to the USA; all samples contained only T. murrelli. This is the first identification of T. murrelli in red foxes from Pennsylvania, …

The Influence Of Social And Spatial Processes On The Epidemiology Of Environmentally Transmitted Pathogens In Wildlife: Implications For Management, Aakash Pandey, Chris Wojan, Abigail Feuka, Meggan E. Craft, Kezia Manlove, Kim M. Pepin

United States Department of Agriculture Wildlife Services: Staff Publications

Social and spatial structures of host populations play important roles in pathogen transmission. For environmentally transmitted pathogens, the host space use interacts with both the host social structure and the pathogen’s environmental persistence (which determines the timelag across which two hosts can transmit). Together, these factors shape the epidemiological dynamics of environmentally transmitted pathogens. While the importance of both social and spatial structures and environmental pathogen persistence has long been recognized in epidemiology, they are often considered separately. A better understanding of how these factors interact to determine disease dynamics is required for developing robust surveillance and management strategies. Here, …

Bayesian Integrated Species Distribution Models For Hierarchical Resource Selection By A Soaring Bird, Ryo Ogawa, Guiming Wang, L. Wes Burger, Bronson Strickland, J. Brian Davis, Fred L. Cunningham

United States Department of Agriculture Wildlife Services: Staff Publications

Migratory birds exhibit seasonal geographic range (hereafter, range) dynamics during the annual cycle. Few studies have examined how migratory birds select their habitats for range occupancy at the species level and space use at the individual level simultaneously. We hypothesized that environmental variables directly related to fitness components would affect the range occupancy probabilities of migrants, whereas environment variables related to movements and flights would affect the space use intensities of migrants. We built Bayesian integrated species distribution models (ISDMs) to evaluate the effects of climate conditions, wind conditions, and landcover compositions on the seasonal range dynamics of American white …

Agricultural And Ecological Resources Safeguarded By The Prevention Of Wild Pig Population Expansion, Colin Jareb, Kim M. Pepin, Ryan S. Miller, Stephanie A. Shwiff, Sophie C. Mckee

United States Department of Agriculture Wildlife Services: Staff Publications

Wild pigs (Sus scrofa) are one of the most destructive invasive species in the United States, known for causing extensive damage to agricultural commodities, natural resources, and property, and for transmitting diseases to livestock. Following the establishment of the National Feral Swine Damage Management Program (NFSDMP) in 2014, the expansion of wild pig populations has been successfully slowed. This paper combines two modeling approaches across eight separate models to characterize the expansion of wild pig populations in the absence of intervention by the NFSDMP and forecasts the value of a subset of resources safeguarded from the threat of …

Raccoon Density Estimation From Camera Traps For Raccoon Rabies Management, Amy J. Davis, Wesley C. Dixon, Richard B. Chipman, Amy T. Gilbert, Jacob E. Hill, James C. Beasley, Olin E. Rhodes Jr., Guha Dharmarajan

United States Department of Agriculture Wildlife Services: Staff Publications

Density estimation for unmarked animals is particularly challenging, yet density estimates are often necessary for effective wildlife management. Raccoons (Procyon lotor) are the primary terrestrial wildlife reservoir for Lyssavirus rabies within the United States. The raccoon rabies variant (RRVV) is actively managed at landscape scales using oral rabies vaccination (ORV) within the eastern United States. To effectively manage RRVV, it is important to know the density of raccoons to appropriately scale the density of ORV baits distributed on the landscape. We compared methods to estimate raccoon densities from camera‐trap data versus more intensive capture‐mark‐recapture (CMR) estimates across 2 …

Surveillance Of Highly Pathogenic Avian Influenza Virus In Wild Canids From Pennsylvania, Usa, Kevin D. Niedringhaus, Taylor C. Chan, Ashley Mcdowell, Lauren Mxwell, Madison Stevens, Lane Potts, Erica Miller, Eman Anis, Kyle Van Why, Thomas Keller, David Stallknecht, Rebecca L. Poulson, Kaitlyn Bahrs, Justin D. Brown

United States Department of Agriculture Wildlife Services: Staff Publications

The avian influenza virus is a global pathogen with significant health and economic implications. While primarily a pathogen of wild and domestic birds, recent outbreaks of the H5N1 highly pathogenic avian influenza virus (HPAIV) clade 2.3.4.4b have caused mortality in a wide variety of mammals, including members of the Canidae family, on multiple continents. Despite sporadic mortality events globally, the epidemiology and pathobiology of H5N1 HPAIV in wild canids remains poorly defined. During 2022–2024, 41 wild canid carcasses (diagnostic cases), including 23 red foxes and 18 gray foxes, were tested for the influenza A virus (IAV) via PCR, with five …

Returning To Physical Activity Following Injury: Exploring Psychological Readiness In Middle-Aged Adults, Hunter Martin

Theses and Dissertations (Comprehensive)

Previous researchers have focused on a variety of psychological aspects of injury rehabilitation in the context of returning to competitive sport (Ardern et al., 2016; Donald, 2019; Podlog et al., 2022; Webster et al., 2018). Return to sport decisions have been largely based on physical assessment and functional ability tests with little focus on psychological elements of recovery (Podlog et al., 2015). The existing literature on psychological readiness (PR) to return to sport has grown in recent years, primarily exploring the experiences of young adult athletes aged 18-30 (Podlog et al., 2022). There has been no previous research exploring the …

Experiences Of Peer Interaction Amongst Autistic Lgbtq+ Youth In Secondary Institutions, Brianna Comeau

Theses and Dissertations (Comprehensive)

This study uncovered the experiences of LGBTQ+ youth on the autism spectrum in Ontario secondary institutions and examined how their interactions with peers shape identity, mental health, well-being, and social belonging. This qualitative research involved interviewing six autistic LGBTQ+ youth across Ontario over Zoom. The study was guided by constructivism, critical theory, neurodiversity, and intersectionality. Results suggest that participants faced discrimination through microaggressions, peer victimization, and stereotyping, which led to feeling less safe in their school environments. Participants also had positive, affirming experiences relating to other peers standing up for them and recognizing their identities, as well as through supporting …

Market Information, Human Behaviour, And Policy: Dissecting The Trucking Freight Spot Markets In Three Essays, Shervin Espahbod

Theses and Dissertations (Comprehensive)

This multidisciplinary dissertation seeks to provide a theoretically and practically informed, contemporary understanding of the mechanisms of trucking freight spot markets in North America. This thesis builds upon background from technology and policy innovations in markets and adopts an increasingly broader interdisciplinary lens in operational sciences. To this end, I consulted a broad range of literature, designed and conducted three experiments, and completed a theoretical review. The work, presented in the form of three essays, showcases the workings of trucking freight spot markets and operational sciences at large from a comprehensive perspective, emphasizing the role of information, human cognitive biases, …

Variation In Mainland Northwest Territories Late-Winter Muskox (Ovibos Moschatus) Density Estimations And Habitat Associations Above And Below Treeline., Charlotte Rentmeister

Theses and Dissertations (Comprehensive)

The Arctic and Sub-Arctic ecosystems are seeing accelerated changes in temperature, landcover, and consequently species abundance and distributions. Reliable distributions, and associated population density estimates, are essential for effective conservation and management efforts. Growing concerns from northern communities regarding the relationship between muskox and declining caribou populations strengthens the need for updated information on muskox populations within mainland Northwest Territories (NWT). The first objective for my research was to quantify and map updated winter estimates of abundance, density, and distribution of muskoxen within three recent survey regions located in mainland NWT, using a multiple covariate distance sampling method (MCDS), paired …

Unexpected Ring Opening Reactions, Solid-State Structures, And A Chemiluminescent Reaction, L Hiscock

Theses and Dissertations (Comprehensive)

Functional π-materials involve the use of an aromatic π-system to carry out a function such as electron transport (organic electronics), absorbing and emitting photons (dyes, fluorescent materials), self-assembly (discotic liquid crystals), or sensors for various analytes. Our lab has recently published the syntheses of heteroaromatic derivatives of tetrafluoroterephthalonitrile (TFTP, 2.24) synthesised via nucleophilic aromatic substitution chemistry. The prepared derivatives have displayed fluorescent (e.g. 2.2)1 and liquid crystalline (1.0)2 properties, as well as displaying close π-π interactions in the solid state (2.8).3 As the materials we are synthesising all belong to the class of aromatic compounds, an introduction to aromaticity and …

Effect Of Rare Earth Element Mixtures On Daphnia Magna, Celine Do

Theses and Dissertations (Comprehensive)

Rare earth elements (REEs) are increasingly being used in modern technologies and as such, there is an increasing concern for the potential environmental risk associated with anthropogenic contamination. In addition to there being very little data available for individual REEs, there is also a lack of knowledge concerning mixtures. The objective of my study was to investigate the chronic effects of lanthanum (La) and yttrium (Y) as well as the acute effects of neodymium (Nd), praseodymium (Pr) and Y as a single metal and as a mixture to Daphnia magna. Standard 21-d chronic tests and 48-h single metal acute …

Examining The Mental Health Experiences Of Lgbtq+ Identifying Muslim Students In Ontario’S Post-Secondary Institutions, Bushra Ahmed

Theses and Dissertations (Comprehensive)

This qualitative study explores the unique mental health experiences of Ontario’s LGBTQ+ Muslims in post-secondary settings. The study looks at how LGBTQ+ Muslim students’ mental wellness (i.e., sense of belonging, feeling affirmed in their intersecting identities of being Muslim and belonging to LGBTQ+ community) is affected as they try to navigate systemic barriers and make space for themselves in various settings (i.e., academic, LGBTQ+ affirming spaces, Muslim-specific spaces, student services) on campuses in Ontario, Canada. The study sample consists of four LGBTQ+ identified Muslim students across post-secondary institutions in Ontario and participants discussed their emotional, mental, and sense of belonging …

Grammatical Aspect, Temporal Adverbs, And Situation Models, Valerie Hemeon

Theses and Dissertations (Comprehensive)

Grammatical aspect and temporal cues have been shown to impact discourse processing. To explore this further, we contrasted temporal adverbs that move narrative timelines forward or backward. Although previous research has examined timelines independently, it was yet to be explored how timeline adverbs impact discourse processing when grammatical aspect and temporal cues are also manipulated. The experiment involved a sentence-completion task which allowed us to measure availability of target discourse concepts in situation models. Results showed main effects for grammatical aspect, temporal shifts, and narrative timeline directions. Three two-way interactions were found. The results demonstrated support for the iconicity assumption …

Leadership And Emergent Faith Communities In Canada: A Phenomenological Study, Anne Anderson

Theses and Dissertations (Comprehensive)

The purpose of this study is to explore how participants within emergent faith communities in Canada experience leadership. Through a phenomenological approach, members from five emergent faith communities across Canada have been interviewed in a semi-structured format. Emerging themes of transformational leadership, community along with belonging, and possible future areas of research will be discussed.

The Wilderness Which Never Was: A History Of The Białowieża Forest 1850–1947, Rafal Stolarz

Theses and Dissertations (Comprehensive)

Located on both sides of the Polish-Belarusian border in north-eastern Poland, the Białowieża forest is the largest remaining remnant of the vast primeval forest that once covered most of Europe. It is also home to Europe’s biggest land animal—the European bison. Over the past century Polish governments, as well as modern-day Polish and European environmental groups, have promoted the forest as the “last European wilderness.” Even today, the public regularly protests and decries news of human encroachment on the forest. Yet in reality, the Białowieża forest has been exploited and studied by humans for centuries, making it one of the …

The Prevalence And Consequences Of Gender-Based Violence Among Trans And Non-Binary University Students In Ontario, Jia Qing Wilson-Yang

Theses and Dissertations (Comprehensive)

Community studies documenting gender-based violence (GBV) experienced by trans and non-binary (TNB) people often find differences in prevalence across TNB subgroups. Studies of TNB university students tend to treat them as a homogenous group, thus gender differences in terms of subgroups are unknown. Using data collected from TNB Ontario university students, I examined the prevalence and impacts of GBV across three TNB subgroups (trans man spectrum, trans women spectrum, and gender queer/non-binary). Specifically, reflecting subtle and overt forms of GBV, among each subgroup I explored the frequency of trans environmental microaggressions, trans interpersonal microaggressions, and victimization, and their relationship with …

Mainstream Media Portrayal Of Banishment And Nation-Imposed Punishment, Keely Ormond

Theses and Dissertations (Comprehensive)

“In a traditional village, we wouldn’t have a teepee with no door on it and throw somebody in there. We wouldn’t cast them out, because banishment meant death. What we had to do was restore relationships” – Ryan Beardy (Thorpe, 2022).

The following project examines the representation of Indigenous traditions, customs, and issues in Canadian mainstream media. Specifically, this project is interested in the portrayal of banishment as an Indigenous practice in Canadian mainstream news outlets. This project is based on an interpretive paradigm informed by grounded theory and concepts of media framing, postcolonialism, settler colonialism and restorative justice. Nineteen …

Overcoming The Unseen: Understanding Diverse Canadian Workers’ Well-Being During The Beginning Of The Coronavirus Pandemic, Tyler M. Pacheco

Theses and Dissertations (Comprehensive)

Canadian workers were severely affected by the onset of the coronavirus (COVID-19) pandemic. The rapid spread of the pathogen across Canada resulted in several work-related consequences (e.g., temporary/indefinite layoffs and business closures, mandatory working-from-home) that could have impacted workers’ well-being during this turbulent period. Research available at the start of this dissertation process, and even more recently published studies, primarily explored general trends in workers’ negative well-being during COVID-19, not examining the distinct realities that diverse workers, including more marginalized ones, may have experienced. Across three manuscripts, several theories from diverse disciplines (positive, developmental, community, and industrial-organizational psychology, public health) …

Making The Pluriverse Visible: World-Making On The Saugeen (Bruce) Peninsula, Lauren Judge

Theses and Dissertations (Comprehensive)

This dissertation argues that visual artists who live and work on the Saugeen (Bruce) Peninsula, in Ontario, Canada, are co-creating artworks with non-humans, which is evidence of more-than-human world-making. Such co-creative experiences are the result of, and catalysts for the kinds of enchantment our human worlds need to form meaningful and holistic connections with non-humans, effectively creating a more inclusive pluriverse. After reviewing interdisciplinary literature in posthuman studies, creative geography, arts-based practices, environmental humanities, Indigenous knowledges, and political ontology, I designed my research to include a combination of qualitative methodologies and methods, including autoethnography and research-creation, to investigate fourteen visual …

From The Invisible Man To Cozy Closets: Gender Diverse Student Narratives In Ontario Catholic Schools, Yvonne Runstedler

Theses and Dissertations (Comprehensive)

In the province of Ontario, Catholic schools have public funding from the Ministry of Education and ecclesial oversight from the local Catholic diocese. Transgender students who attend these schools experience both governmental spaces and religious ones. The inherent secular and theological tensions responsive to Two-Spirit, Lesbian, Gay, Bisexual Transgender, intersex, Asexual, and other queer-identities [2SLGBTQIA+] students are the overarching contexts of this study. While many Catholic school boards have completed publicly-facing acts of inclusion for 2SLGBTQIA+ students, such as raising the Pride Flag in June in recent years, there is a scarcity of literature responsive to how transgender students make …

Shifting Blame And Gendered Differences: A News Media Study Of The Characterization Of Police Sexual Violence, Brittany Nieman

Theses and Dissertations (Comprehensive)

This thesis offers a critical analysis of media representations of police sexual violence cases in Canada. This paper looks to fill the gap on media representations of police sexual violence cases and to contribute to long standing literature on gendered issues in policing. Symbolic interactionism, framing theory, and critical feminist ideologies make up the theoretical background for this work. Using Altheide and Schneiders (2012) Qualitative Document Analysis Process, a media analysis was conducted on 104 Canadian news articles revolving around police sexual violence cases occurring on Canadian policing services. This study primarily revealed a dichotomy in representations of the complainant …

Indigenous Wholistic Abolition: Visioning Indigenous Queer, Two-Spirit & Indigiqueer Futures, Giselle Dias

Theses and Dissertations (Comprehensive)

As a queer Métis, activist and organizer in the field of prisoners’ rights, penal abolition, and transformative justice, I have been interested in learning about how Indigenous peoples’ relationship with Aki (Land) grounds abolition theory and guides the ways that I and other Indigenous abolitionists engage in abolition. As part of this process, I wanted to speak to other Indigenous queer, Two-Spirit, trans, non-binary, and/or Indigiqueer (Q2STNBI) people about their visions of abolition and abolitionist futures through a relational Land-based lens. Therefore, I used a methodology that centres Métis worldviews and community organizing and is grounded in the ethics of …