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Description
Desert ecosystems are one of the fastest urbanizing areas on the planet. This rapid shift has the potential to alter the abundances and species richness of herbivore and plant communities. Herbivores, for example, are expected to be more abundant in urban desert remnant parks located within cities due to anthropogenic activities that concentrate food resources and reduce native predator populations. Despite this assumption, previous research conducted around Phoenix has shown that top-down herbivory led to equally reduced plant biomass. It is unclear if this insignificant difference in herbivory at rural and urban sites is due to unaltered desert herbivore populations or altered activity levels that counteract abundance differences. Vertebrate herbivore populations were surveyed at four sites inside and four sites outside of the core of Phoenix during fall 2014 and spring 2015 in order to determine whether abundances and richness differ significantly between urban and rural sites. In order to survey species composition and abundance at these sites, 100 Sherman traps and 8 larger wire traps that are designed to attract and capture small vertebrates such as mice, rats, and squirrels, were set at each site for two consecutive trap nights. Results suggest that the commonly assumed effect of urbanization on herbivore abundances does not apply to small rodent herbivore populations in a desert city, as overall small rodent abundances were statistically similar regardless of location. Though a significant difference was not found for species richness, a significant difference between small rodent genera richness at these sites was observed.
ContributorsAlvarez Guevara, Jessica Noemi (Co-author) / Ball, Becky A. (Co-author, Thesis director) / Hall, Sharon J. (Co-author) / Bateman, Heather (Committee member) / School of Sustainability (Contributor) / School of Mathematical and Natural Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
In recent years, ecologists have begun to study the effects of urbanization on species diversity. While urban areas generally suffer decreased biodiversity, some species, termed “urban exploiters”, not only live in the city but depend on urban resources to thrive. It is hypothesized that urban exploiters may succeed in part due to phenotypic plasticity, in which organisms rapidly adjust their physiology or behavior to adapt to novel environmental contexts. In the city, it may be adaptive to display thermal plasticity, as the urban heat island effect caused by concrete and asphalt infrastructure prevents cooling at night. In this study, we observed the decorated cricket Gryllodes sigillatus, an invasive urban exploiter found in metropolitan Phoenix, in two separate experiments. We hypothesized that heat tolerance and activity are both plastic traits in this species. In Experiment 1, we predicted that knock-down time, a measure of heat tolerance, would be negatively affected by acclimation to a laboratory environment. Our results suggest that heat tolerance is affected by recent thermal regimes and that laboratory acclimation decreases knock-down time. In Experiment 2, we predicted that activity would increase with temperature until a point of extreme heat, at which point activity would decline. Statistical analysis for the second experiment reveals that activity decreases at 33°C, a natural urban extreme. This suggests either that 33°C is a thermal limit to physiology or that G. sigillatus is able to alter its behavior to exploit local thermal heterogeneity.
ContributorsVannan, Annika (Author) / Johnson, James Chadwick (Thesis director) / Angilletta, Michael (Committee member) / Barrett, The Honors College (Contributor) / School of Mathematical and Natural Sciences (Contributor) / School of Social and Behavioral Sciences (Contributor)
Created2015-05
Description
The spread of urbanization leads to habitat fragmentation and deterioration and changes the composition of ecosystems for species all over the world. Different groups of organisms are impacted differently, and insects have experienced loss in diversity and abundance due to changing environmental factors. Here, I collected seed beetles across 12 urban and rural sites in Phoenix, Arizona, to analyze the effects of urbanization and habitat variation on beetle diversity and abundance. I found that urbanization, host tree origin, and environmental factors such as tree diversity and density had no impact on overall beetle diversity and abundance. Beetles were found to have higher density on hosts with a higher density of pods. In assessing individual beetle species, some beetles exhibited higher density in rural sites with native trees, and some were found more commonly on nonnative tree species. The observed differences in beetle density demonstrate the range of effects urbanization and environmental features can have on insect species. By studying ecosystem interactions alongside changing environments, we can better predict the role urbanization and human development can have on different organisms.
ContributorsPaduano, Gabrielle (Author) / Savalli, Udo (Thesis director) / Sweat, Ken (Committee member) / Division of Teacher Preparation (Contributor) / School of Mathematical and Natural Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
Description
The objective of the research was to simulate interdependencies between municipal water-power distribution systems in a theoretical section of the Phoenix urban environment that had variable population density and highest ambient temperature. Real-time simulations were run using the Resilient Infrastructure Simulation Environment (RISE) software developed by Laboratory for Energy and Power Solutions (LEAPS) at ASU. The simulations were run at estimated population density to simulate urbanism, and temperature conditions to simulate increased urban heat island effect of Phoenix at 2020, 2040, 2060, and 2080 using the IEEE 13 bus test case were developed. The water model was simulated by extrapolated projections of increased population from the city of Phoenix census data. The goal of the simulations was that they could be used to observe the critical combination of system factors that lead to cascading failures and overloads across the interconnected system. Furthermore, a Resilient Infrastructure Simulation Environment (RISE) user manual was developed and contains an introduction to RISE and how it works, 2 chapters detailing the components of power and water systems, respectively, and a final section describing the RISE GUI as a user. The user manual allows prospective users, such as utility operators or other stakeholders, to familiarize themselves with both systems and explore consequences of altering system properties in RISE by themselves. Parts of the RISE User Manual were used in the online "help" guide on the RISE webpage.
ContributorsSchadel, Suzanne (Author) / Johnson, Nathan (Thesis director) / Hamel, Derek (Committee member) / School of International Letters and Cultures (Contributor) / School of Sustainable Engineering & Built Envirnmt (Contributor) / School of Sustainability (Contributor) / Barrett, The Honors College (Contributor)
Created2018-12
Description
With increasing urbanization, organisms face a myriad of novel ecological challenges. While the eco-evolutionary dynamics of urbanization are currently receiving a great deal of attention, the effect of urban disturbance on the microbiome of urban organisms is relatively unstudied. Indeed, studies of the microbiome may illuminate the mechanisms by which some species thrive after urbanization (pest implications), while other species go locally extinct (biodiversity implications). We investigated the gut microbiome of the Western black widow spider (Latrodectus hesperus). L. hesperus is an ideal model system as they are a pest species of medical importance in urban ecosystems, often forming dense urban infestations relative to the sparse populations found in their native Sonoran Desert. To gain insight into the composition of the microbiome in L. hesperus and its potential function, we sampled 4 urban, 4 desert, and 2 laboratory-reared spiders, and high-throughput sequencing of the 16S rRNA V4 region was used to investigate the diversity of gut microbiota. Dominant bacterial phyla across all samples were Firmicutes, Proteobacteria, and Actinobacteria. While desert widows showed more gut microbial diversity than urban widows, the difference was not statistically significant. The relative abundance of taxonomic classes Blastocatellia, Acidobacteriia, and Thermoleophilia detected in desert spiders was especially higher than those in urban and laboratory-reared spiders. However, urban spiders had a higher relative abundance of taxonomic class Actinomycetia. Differences in widow gut microbiome diversity improves our understanding of how features unique to a habitat, like prey diversity and soil microbes, may be shaping their microbiome. Additionally, this work further highlights the impact urbanization has on biodiversity loss, which indirectly develops a new biomarker for differentiating between urban and desert black widow spiders based on their gut microbiome.
ContributorsAsrari, Hasti (Author) / Johnson, Chad (Thesis director) / Sandrin, Todd (Committee member) / Barrett, The Honors College (Contributor) / School of Mathematical and Natural Sciences (Contributor) / School of Life Sciences (Contributor)
Created2022-12
Description
Forensic science is the application of science to matters of law, especially criminal investigation and procedure. ForenSICK Science, on the other hand, is an educational YouTube channel. It was created in early 2019 after listening to two people on a podcast confidently preach surprisingly inaccurate information about forensic science. My goal in the creation of the channel was to give people the proper information regarding the practice. This goal grew to encompass several different fields including continued education practices, informal and nonformal learning, and combating “science speak.” Using YouTube as a tool in this journey was the first step in combating forensic inaccuracies.
ContributorsByrne, Mckenna Noel (Author) / Kobojek, Kimberly (Thesis director) / Wentzel, Bonnie (Committee member) / College of Health Solutions (Contributor) / School of Film, Dance and Theatre (Contributor) / School of Mathematical and Natural Sciences (Contributor) / Watts College of Public Service & Community Solut (Contributor) / Barrett, The Honors College (Contributor)
Created2020-05
Description
The process of communicating science between the general public and scientific community has been marked by several challenges in the modern setting. Namely, scientists’ trepidation toward misinterpretation, jeopardization of professional reputability, and perception of two distinct arenas of communication has led to the perpetuation of the deficit model of communication. This model is exceptionally limiting as it effectively removes the scientists from the public sphere and can have devastating societal repercussions. The dialogue model of communication is a much more effective communicative model for the modern setting but has been met with resistance in its adoption. As communication as a whole is grounded in multiple foundational disciplines of psychology, philosophy, linguistics, and other fields, it would be apparent that the adoption of the principles of polymathy would serve to better prepare scientists to engage in mass communication with the public. As polymathy is a lifelong pursuit, the implementation of narrative training into collegiate undergraduate science curriculum would serve as a particularly potent beginning. That is, narrative's ability to reach near-universal audiences, enhance the recall and comprehension of complex subject matter, and forge an empathetic connection essential to effective communication is uniquely suited in ensuring a more effective communicative dynamic between the scientific community and the general public. As such, this thesis serves to advocate the adoption of narrative-based communicative training into undergraduate science curriculum not as separate courses, but rather as direct incorporation. This would serve to both revitalize polymathy in the modern age and prepare the next generation of scientists to be better equipped for the public dialogue.
ContributorsCoker, Keaton M (Author) / Ramsey, Ramsey E. (Thesis director) / Wentzel, Bonnie (Committee member) / School of Social and Behavioral Sciences (Contributor) / School of Mathematical and Natural Sciences (Contributor) / Barrett, The Honors College (Contributor)
Created2020-05
Description
Cosmic horror distinguishes itself from standard horror in large part because of the things that it finds horrifying. Cosmic horror, like any horror, attaches itself to external experience. Powerful technologies’ ability to reshape our perspective are the ideal choice for this anchor point. Beyond the Wall of Sound is a podcast that seeks to unify the existential dread and scientific imaginings inherent in cosmic horror and weird fiction, with dystopian visions of technological futures. The podcast uses the strange and horrifying mind of HP Lovecraft, as revealed through his short stories, to shed light on the horrifying, revealing and absurd imaginaries that drive and emerge unintentionally from current pursuits in science and technological innovation. In this essay, I describe the roots of horror and its relevance and therefore applicability to human experience. I then exemplarily relate the practical mode of thought that created one of the podcast’s episodes, which take’s Lovecraft’s The Thing on the Doorstep and the authors fears of the future as a lens to discuss and reflect upon the technology of body switching. The podcast is presented as an important piece of science communication in the face of increasing misinformation and a rolling technological wave. The project is affected by the strength of Lovecraft’s influences over time, and ultimately is itself a vehicle for and a deconstruction of that influence. Ultimately, the purpose of this podcast is not to horrify, but to inspire people to do good and remain educated despite the horrors of a pessimistic and uncaring existence.
ContributorsMillea, Paul (Author) / Maynard, Andrew (Thesis director) / Withycombe-Keeler, Lauren (Committee member) / School of Sustainability (Contributor) / School for the Future of Innovation in Society (Contributor) / Barrett, The Honors College (Contributor)
Created2019-05
Description
My Honors Thesis/ Creative Project was an collection of art pieces that were based on a research done at West Campus in Dr. Weidner's forensic entomology laboratory. In this research, two swine carcasses were place outdoors for 21 days during the four seasons. The goal was to collect insects that approached and colonized the carcasses. The collected data can be used to determine the TOC (time of colonization) of some insects; thus, it can help to calculate the PMI (postmortem interval). Different collection were used like larvae rearing, pitfalls, netting, and hand collection. The larvae were reared into adulthood and then identified into a species. The rest of the insects were identified into orders. To present this information, the data collected from the two carcasses was combined to make the presentation easier to understand. I created four circular canvases to present the collection of flies in each check. It shows both flies were reared and which were seen or collected. The other series of work that I sculpted were 120 ceramics flowers to represent the insects orders that were observed in each season and check. During my thesis defense, I presented the research project, and how my project can help people understand this research.
ContributorsMunoz Zavala, Jaira (Author) / Weidner, Lauren (Thesis director) / Meeds, Andrew (Committee member) / Neubauer, Mary (Committee member) / Barrett, The Honors College (Contributor) / School of Mathematical and Natural Sciences (Contributor) / School of Art (Contributor)
Created2023-12
ContributorsMunoz Zavala, Jaira (Author) / Weidner, Lauren (Thesis director) / Meeds, Andrew (Committee member) / Neubauer, Mary (Committee member) / Barrett, The Honors College (Contributor) / School of Mathematical and Natural Sciences (Contributor) / School of Art (Contributor)
Created2023-12