Digital Commons Network^™

The Importance Of The Northeastern Gulf Of Mexico To Foraging Loggerhead Sea Turtles, Kristen M. Hart, Margaret M. Lamont, Autumn R. Iverson, Brian J. Smith

Wildland Resources Student Research

Identification of high-use foraging sites where imperiled sea turtles are resident remains a globally-recognized conservation priority. In the biodiverse Gulf of Mexico (GoM), recent telemetry studies highlighted post-nesting foraging sites for federally threatened loggerhead turtles (Caretta caretta). Our aim here was to discern loggerhead use of additional northern GoM regions that may serve as high-use foraging sites. Thus, we used satellite tracking and switching state-space modeling to show that the Big Bend region off the northwest Florida coast is a coastal foraging area that supports imperiled adult female loggerhead turtles tracked from different nesting subpopulations. From 2011 to …

Outstanding Questions In Flower Metabolism, Monica Borghi, Alisdair R. Fernie

Biology Faculty Publications

The great diversity of flowers, their color, odor, taste, and shape, is mostly a result of the metabolic processes that occur in this reproductive organ when the flower and its tissues develop, grow, and finally die. Some of these metabolites serve to advertise flowers to animal pollinators, other confer protection towards abiotic stresses, and a large proportion of the molecules of the central metabolic pathways have bioenergetic and signaling functions that support growth and the transition to fruits and seeds. Although recent studies have advanced our general understanding of flower metabolism, several questions still await an answer. Here, we have …

Influence Of Total Western Diet On Docosahexaenoic Acid Suppression Of Silica-Triggered Lupus Flaring In Nzbwf1 Mice, Kristen N. Gilley, Kathryn A. Wierenga, Preeti S. Chauhaun, James G. Wagner, Ryan P. Lewandowski, Elizbeth A. Ross, A. L. Lock, Jack R. Harkema, Abby D. Benninghoff, James J. Pestka

Animal, Dairy, and Veterinary Science Faculty Publications

Lupus is a debilitating multi-organ autoimmune disease clinically typified by periods of flare and remission. Exposing lupus-prone female NZBWF1 mice to crystalline silica (cSiO₂), a known human autoimmune trigger, mimics flaring by inducing interferon-related gene (IRG) expression, inflammation, ectopic lymphoid structure (ELS) development, and autoantibody production in the lung that collectively accelerate glomerulonephritis. cSiO₂-triggered flaring in this model can be prevented by supplementing mouse diet with the ω-3 polyunsaturated fatty acid (PUFA) docosahexaenoic acid (DHA). A limitation of previous studies was the use of purified diet that, although optimized for rodent health, does not reflect the …

Disconnect Within Agriculture And Ecosystem Climate Effects, Adaptations And Policy, Anastasia W. Thayer, Aurora M. Vargas, Thomas E. Lacher, Bruce A. Mccarl

Applied Economics Faculty Publications

Frequently, agriculture and ecosystems (AE) are seen as separate entities, causing entity specific solutions in response to threats. Anthropogenic climate change simultaneously stresses both agriculture and ecosystems along with their interactions. Induced increasing surface temperatures [1], altered precipitation [2], drought intensification [3], altered ground and surface water quantity/quality [4,5], and diminished soil moisture [6] force adaptations for AE, but these adaptations fail to be efficient when interdependencies are not considered. Additional adaptations will be necessary, as future projections anticipate even greater climate change [1].

The Comparative Cytotoxicity Of Riddelliine In Primary Mouse, Rat And Chick Hepatocytes, Bryan L. Stegelmeier, William S. Resager, Steven M. Colegate

Poisonous Plant Research (PPR)

Dehydropyrrolizidine alkaloid (DHPA) producing plants commonly poison livestock, wildlife and humans. Poisoning occurs when DHPAs are ingested as feed or food, or when they contaminate medicinal or herbal products. Direct toxicologic comparison of individual DHPAs is essential to estimate their actual health risks. This has been problematic due to varying models and difficulties in DHPA isolation or synthesis. In contrast, the macrocyclic DHPA riddelliine is readily isolated and it has been used as a benchmark to characterize different models of toxicity and carcinogenicity. Following earlier work with immortalized cell lines, the objective of this study was to characterize the effect …

Random Encounter And Staying Time Model Testing With Human Volunteers, Laura Garland, Eric Neilson, Tal Avgar, Erin Bayne, Stan Boutin

Ecology Center Publications

Ecology and management programs designed to track population trends over time increasingly are using passive monitoring methods to estimate terrestrial mammal densities. Researchers use motion‐sensing cameras in mammal studies because they are cost‐effective and advances in statistical methods incorporate motion‐sensing camera data to estimate mammal densities. Density estimation involving unmarked individuals, however, remains challenging and empirical tests of statistical models are relatively rare. We tested the random encounter and staying time model (REST), a new means of estimating the density of an unmarked population, using human volunteers and simulated camera surveys. The REST method produced unbiased estimates of density, regardless …

Network Structure Of Vertebrate Scavenger Assemblages At The Global Scale: Drivers And Ecosystem Functioning Implications, Esther Sebastián-González, Zebensui Morales-Reyes, Francisco Botella, Lara Naves-Alegre, Juan M. Pérez-García, Patricia Mateo-Tomás, Pedro P. Olea, Marcos Moleón, Jomar M. Barbosa, Fernando Hiraldo, Eneko Arrondo, José A. Donázar, Ainara Cortés‐Avizanda, Nuria Selva, Sergio A. Lambertucci, Aishwarya Bhattacharjee, Alexis L. Brewer, Erin F. Abernethy, Kelsey L. Turner, James C. Beasley, Travis L. Devault, Hannah C. Gerke, Olin E. Rhodes Jr., Andrés Ordiz, Camilla Wikenros, Barbara Zimmermann, Petter Wabakken, Christopher C. Wilmers, Justine A. Smith, Corinne J. Kendall, Darcy Ogada, Ethan Frehner, Maximilian L. Allen, Heiko U. Wittmer, James R. A. Butler, Johan T. Du Toit, Et Al.

Wildland Resources Faculty Publications

The organization of ecological assemblages has important implications for ecosystem functioning, but little is known about how scavenger communities organize at the global scale. Here, we test four hypotheses on the factors affecting the network structure of terrestrial vertebrate scavenger assemblages and its implications on ecosystem functioning. We expect scavenger assemblages to be more nested (i.e. structured): 1) in species‐rich and productive regions, as nestedness has been linked to high competition for carrion resources, and 2) regions with low human impact, because the most efficient carrion consumers that promote nestedness are large vertebrate scavengers, which are especially sensitive to human …

Modelling Eurasian Beaver Foraging Habitat And Dam Suitability, For Predicting The Location And Number Of Dams Throughout Catchments In Great Britain, Hugh A. Graham, Alan Puttock, William W. Macfarlane, Joseph Michael Wheaton, Jordan T. Gilbert, Róisín Campbell-Palmer, Mark Elliott, Martin J. Gaywood, Karen Anderson, Richard E. Brazier

Watershed Sciences Faculty Publications

Eurasian beaver (Castor fiber) populations are expanding across Europe. Depending on location, beaver dams bring multiple benefits and/or require management. Using nationally available data, we developed: a Beaver Forage Index (BFI), identifying beaver foraging habitat, and a Beaver Dam Capacity (BDC) model, classifying suitability of river reaches for dam construction, to estimate location and number of dams at catchment scales. Models were executed across three catchments, in Great Britain (GB), containing beaver. An area of 6747 km² was analysed for BFI and 16,739 km of stream for BDC. Field surveys identified 258 km of channel containing beaver …

Utah State University Commencement, 2020 – Main Campus, Utah State University

Commencement Programs

133rd Annual Commencement of Utah State University

Perceptions And Behavioral Intentions Of Utah 4-H Equine Program Leaders In Teaching Equine Safety To Youth, Katelyn M. Huffman

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

There is an inherent risk associated with working with youth and large equine. The Utah 4-H Equine program is a volunteer-based program that seeks to properly educate youth on equine husbandry, this includes the topic of safe equine handling practices. The purpose of this study was to explore the perceptions and behavioral intentions of Utah 4-H Equine Program leaders about teaching equine safety, including attitudes, perceived behavioral controls and subjective norms. The survey instrument consisted of multiple choice, fill in the blank, and six-point Likert scale questions regarding personal demographics, experience teaching equine safety, attitudes towards safety, perceived behavioral controls, …

Exploring Park Quality In Urban Setting With Environmental Justice, Alternative Measurements, And Social Interaction, Shuolei Chen

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

With rapid urbanization, urban green resources, such as parks have become important assets for quality of life in urban settings. Parks provide urban residents with both physical and psychological health benefits through various mechanisms such as physical activity and social interaction. Quality is an important non-spatial dimension of urban parks and has started to gain attention among researchers. To better understand park quality in an urban setting, additional knowledge should be explored. This dissertation studies the quality of urban parks from three different perspectives: 1) the equal distribution of park quality resources and its relationship to environmental justice issues, 2) …

What In Tarnation? Monitoring Animal Entrapments At The Rozel Tar Seeps, Mary Sanchez, Cayla Martin, Jaimi Butler, David Kimberly, Foad Yousef

Utah Space Grant Consortium

The Great Salt Lake (GSL) is one of the largest migratory stops for many species of birds in North America. At Rozel Point, along the banks of the Great Salt Lake, there are tar seeps where some species of birds have gotten entrapped and died. These petroleum seeps are both naturally occurring and human created. The temperature that the seeps become sticky, the possibility of prey animals drawing predators in, and the appearance of the tar seeps are all important aspects of why birds are drawn to these seeps. Using motion sensor cameras and temperature monitoring devices, the animals that …

The Impact Of Robotic Milking Systems: The Case Of The Rocky Mountain Region, Garret Nelson

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

The increasing adoption of automatic milking systems (AMS) in the U.S. has caused interest in determining if they are truly beneficial to the farmers who install them. The focus in this study is to identify the monetary value of AMS for dairies in the Rocky Mountain region and the estimated value of the non-monetary benefits. Using a mixed methods approach to create a survey; information was gathered from farmers in the Rocky Mountain region who are using AMS. The results reveal that monetary benefits from production and labor savings are lacking in themselves to provide positive net present values (NPVs) …

A Temporal Information-Theoretic Model Of Suboptimal Choice, Paul J. Cunningham

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Humans and animals often make decisions not in their long-term best interest. In one example, called suboptimal choice, pigeons sacrifice food for food-predictive stimuli. The study of suboptimal choice can reveal insights into the role of reward-predictive stimuli in maladaptive decision-making that characterizes numerous behavioral disorders. However, there is currently little evidence that rats engage in suboptimal choice, thereby raising questions about the species-generality of suboptimal choice. According to the temporal information-theoretic model, developed in Chapter 2, suboptimal choice emerges when pigeons pay more attention to the bits of temporal information conveyed by food-predictive stimuli than the rate of food …

Investigating Novel Biomarkers Associated With Aki Diagnosis And Risk, Lars Lofgren, Natalie Silverton

Utah Space Grant Consortium

Acute kidney injury (AKI) is a common complication associated with cardiac surgery. Those patients who develop AKI have increased hospital costs, hospital LOS and odds of death. The current diagnostic criteria rely on serum creatinine measurements and urine output data. Serum creatinine is not renal specific. It is known that there are other factors that influence serum creatine concentrations other than renal injury. Serum creatinine levels are measured as concentrations which means large changes in fluid balance may alter the serum creatinine measurement. Urine output is not a reliable measurement of renal injury either. During surgery it is common to …

Development And Validation Of A Synchronous Model To Simulate Skeletal Muscle Damage Due To Spaceflight Ionizing Radiation And Microgravity, Lori M. Caldwell

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

Astronauts traveling or researching in space are subject to a harsh environment that includes high levels of ionizing radiation and microgravity. Ionizing radiation is dangerous to overall health because it causes double-stranded DNA breaks, increases the production of free radicals or reactive oxygen species, and leads to an enhanced risk of cardiovascular disease and cancer over a person’s lifetime. Similarly, microgravity is hazardous to astronaut health because humans require gravity to maintain a healthy heart and muscular and vascular systems.

Both ionizing radiation and microgravity have been studied individually in previous research, but there is a lack of information on …

Interspecific Differences In Stressor Tolerance Drive Community-Level Changes In A Small Aquatic Ecosystem, Jennifer M. Weathered

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

The global human population is expected to reach 9.8 billion by 2050 and an increase in food yield will be needed to provide for the future generations. Insects are among the biggest threats to food production and are therefore the subject of intense chemical control through the application of pesticides. The ability of insects to evolve resistance to pesticides after repeated use has been documented. However, how evolved responses affect individuals’ behaviors, their interactions with others, and how these factors impact overall patterns in distribution remains relatively unexplored in the bromeliad.

The aquatic insect communities housed in water-holding tropical plants …

Exposure Of Phlebotomus Argentipes To Alpha-Cypermethrin, Permethrin, And Ddt Using Cdc Bottle Bioassays To Assess Insecticide Susceptibility, Jacob Rex Andersen

Undergraduate Honors Capstone Projects

Background: Insecticide resistance for sand flies is a concern since sand flies are vectors for Leishmania spp. parasites which cause leishmaniasis affecting millions of people each year. The CDC bottle bioassay is used to assess resistance by comparing known insecticide diagnostic doses and diagnostic times from an insecticide-susceptible population. The objective of this study was to determine diagnostic doses and diagnostic times for α-cypermethrin and the lethal dose for 50% and 90% mortality for α-cypermethrin, permethrin, and DDT for Phlebotomus argentipes.

Methods: The CDC bottle bioassays were performed in 1,000 mL glass bottles with 15-25 sand flies from a laboratory …

The Response Of Male Bumblebees To A Putative Queen Pheromone, Xavier K. Haemmerle

Undergraduate Honors Capstone Projects

Queen pheromones are chemical signals produced by the dominant reproductive female in many species of eusocial insects. These pheromones are vital for maintaining a reproductive division of labor. Two evolutionary scenarios may describe the origin of queen pheromones. Sensory exploitation describes a scenario where the pheromone is produced to take advantage of a preexisting sensory bias in a population. An alternative scenario is that the recipient of the pheromone has an adapted response to a preexisting chemical signal. There is a growing body of evidence that cuticular hydrocarbons that act as queen pheromones are co-opted from ancient fertility signals that …

'Queertility', Daniel Thomas Bixby Sykes

Undergraduate Honors Capstone Projects

Daniel Sykes, an Anthropology student at Utah State University used his Honors Capstone opportunity to understand the evolution of reproduction over the course of two semesters. During Fall of 2019, he focused on overviewing what Biological Archaeologists, Biologists, and Chemists understand of the evolution of various forms of reproduction from the distant past. During the Spring, he focused on the cutting edge allopathic research in fertility treatments and some of the social implications. Sykes posits that human society has the opportunity to treat infertility in the queer (lgbtqia+) community, given these up-and-coming treatments, even those forms of infertility that arise …

Literary Labyrinths: Reading Like A Detective, Emma A. Hallock

Undergraduate Honors Capstone Projects

Studying literature is like walking through a labyrinth of interpretative possibilities. So, it is no mystery why an English major would be fascinated with detectives; they seem to show the way out of the literary labyrinth. Like detectives, literary critics look for clues in the texts they study and interpret them to find meaning. However, many critics argue that detectives make bad models, and that reading like a detective leads to interpretations that are at best boring and at worst dangerous. It is not clear whether detectives are the best literary critics or the worst. To make sense of this …

Jefferson's Sensitivities: How Thomas Jefferson's Discussions Of Race And Slavery Are Influenced By Audience, Andrea B. Carlquist-Sagers

Undergraduate Honors Capstone Projects

Thomas Jefferson is often presented as an enigma. He who wrote that “all men are created equal” also owned over six hundred slaves during the course of his life. Jefferson was a man of immense complexity and intelligence and, as such, his beliefs cannot be presented in simplified terms. Although his contradictory positions on race and slavery were common during his time, his hypocrisy received critique from contemporaries. Jefferson was a famously sensitive man, and in order to avoid judgement from his peers, he often either censored himself or used eloquent but empty words to satisfy his disparagers. Some historians …

Demystification Of Graph And Information Entropy, Bryce Frederickson

Undergraduate Honors Capstone Projects

Shannon entropy is an information-theoretic measure of unpredictability in probabilistic models. Recently, it has been used to form a tool, called the von Neumann entropy, to study quantum mechanics and network flows by appealing to algebraic properties of graph matrices. But still, little is known about what the von Neumann entropy says about the combinatorial structure of the graphs themselves. This paper gives a new formulation of the von Neumann entropy that describes it as a rate at which random movement settles down in a graph. At the same time, this new perspective gives rise to a generalization of von …

Emergent Seedling Spatial Patterns Following Insect Seed Predation In A Simulated Population, Justin Tirrell

Undergraduate Honors Capstone Projects

Tropical vertebrate species have faced increasing pressures from hunters, causing many to become locally extinct. I used an agent-based model (NEDD) to investigate the influence of dispersal and insect seed predation on seedling survival. Statistical dispersal kernels were used to simulate the dispersal of seeds. The NEDD model generates survival and spatial data from parameter sets, which were chosen based on a Latin-Hypercube experimental design. Spatial point analysis was performed on the output data to identify trends in spatial clustering patterns as the parameter space was changed. The results of this investigation suggest that there is a positive association between …

Shared Roots: An Examination Of The Interconnectedness Of Cultures And Nations Manifest Through Art And Design, Hannah Baldwin

Undergraduate Honors Capstone Projects

Design creates culture. Culture shapes values. Values determine the future.— Robert L. Peters

The way that people influence their surroundings through art and design is a fascinating lens through which to view culture and history. Visual arts, including architecture, illustrate how cultures meld and shape one another’s histories and values as they come in contact. Pattern making, in particular, is found in every culture as a way of recording and making sense of the patterns of life. This project seeks to highlight the interconnectedness of cultures by examining the history and cultures of three European countries through the lens of …

Bookscapes: A Study In The Interconnectivity Of Landscape And Narrative Visualization And Communication In Landscape Architecture, Tonya Randall

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

The fields of landscape architecture and literacy have the potential to be linked through a simulated environment. Through this connection, opportunity for education arises. This thesis creates and describes a program called Bookscapes, which presents a narrative inside a simulated landscape for the purpose of communicating landscape architecture/urban planning principles.

Bookscapes is a stand-alone computer program designed using theories in education and guidelines for virtual and restorative environments (including Huang’s elements, Kaplan’s Attention Restoration Theory for restorative environments, constructivist theory of situational learning) and the revolving design process in landscape architecture’s communication to clients through 3D modeling.

This thesis first …

New Perspectives On Promoting Efl Teaching And Learning In Oman, Jihan Sulaiman Al Naabi

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

This portfolio is an accumulation of work that the author accomplished during her study in the program of Master of Second Language Teaching at Utah State University. It is an outcome of the author’s personal teaching experiences, insights gained from her master’s study, and several class observations as well.

The portfolio comprises three primary portions: (1) teaching perspectives, (2) research perspectives, and (3) an annotated bibliography. The teaching perspectives revolve around the author’s beliefs on the role of both teachers and students in L2 classrooms, the communicative teaching of grammar, and the value of a positive learning environment. The research …

Usu Equine-Assisted Activities And Therapies Facilities Designed Master Plan, Lindsie C. Smith

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Equine-Assisted Activities and Therapies (EAAT) is recognized as a therapeutic approach for persons with disabilities. The USU Animal, Dairy, and Veterinary Sciences Department provides EAAT instruction and services; however, they do not have the appropriate facilities to model best-practices in the delivery of these services. This design research entailed the development of a phased masterplan to support the instruction and delivery of equine-assisted activities and therapies in an innovative and accessible environment that supports animal-assisted intervention and natural equine behaviors.

The methodology used to approach the master plan design was derived from Norman K. Booth’s (1990) design process, as described …

Harvest: Poems, Brittney Allen

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Louise Glück wrote, “the actual making of art is a revenge on circumstance.” The risk, she goes on, is in the possibility of shame. Writing poetry then becomes an act of courage, purchased with sacrifice or loss. “Courage, in this usage, alludes to a capacity for facing down the dark forces.”

In Harvest, a poetry chapbook, the speaker takes revenge on the circumstances of her life by being blunt, bare, and brave on the page. She contends with a male-dominated society and abusive childhood as she moves into adulthood and the supposed saving grace of a marriage. The speaker confesses …

An Investigation Of Pictography And Verbal Rehearsal On College Students’ Recall Of Expository Texts, Joshua Woodruff

All Graduate Plan B and other Reports, Spring 1920 to Spring 2023

Purpose: This study investigated the effects of pictography with and without verbal rehearsal on informational recall of two types of expository texts. This study is part of a research program to further develop a treatment for younger students with language impairment called Sketch-and-Speak.

Procedure: 66 undergraduate students between the ages of 18 and 40 were tested on recall of concrete versus abstract expository texts in a randomized group experiment across three conditions: pictography with and without verbal rehearsal versus re-reading. Participants were trained on the assigned testing condition and then proceeded to the experimental procedure. In the experimental procedure, …