Theses and Dissertations
This collection includes both ASU Theses and Dissertations, submitted by graduate students, and the Barrett, Honors College theses submitted by undergraduate students.
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- All Subjects: Ecology
Description
The geologic epoch of the Anthropocene, or the age of human domination, is a metacondition animated by unprecedented planetary change. Global warming, regular mass extinction events, and ecological disaster wrought from human activity spell crisis for all planetary life while exacerbating dominative relations among the human species. Thus, the Anthropocene may be viewed as an age wherein spheres of precarity widen and (in)direct impacts of ecological disaster differentially harm populations predicated upon their predetermined social location under dominative governmental, economic, and social structures. This metacondition poses a challenge for activists, critical scholars, and critical pedagogues working toward social emancipation. To interpret and combat the complex and scalar logics of power in the Anthropocene, this critical/cultural, rhetoric, and performance project advances a turn toward what I term critical ecological rhetoric. Drawing inspiration from Félix Guattari’s The Three Ecologies and Raymie McKerrow’s critical rhetoric – two modes of theorizing which sought to articulate dominative relations under the metacondition of neoliberal hegemony –this critical ecosophical turn seeks to address power as dispersed across material, social, and psychological registers and as complexly entangled within the metacondition of the Anthropocene. An integral element of critical ecological rhetorical practice is demystifying the presence, construction, and defense of borders imposed within and between ecological registers, as such bordered constructs of difference serve to justify violent domination while concealing ecological logics of interconnectedness.Across three case studies which differently privilege one of three ecological registers, I demonstrate the dynamism of critical ecological rhetoric. In “Pyropolitical Phoenix,” materialist, elemental implications of governmentality in the urban ecology of Phoenix, Arizona are examined as a rhetorical circulation synecdochic of repressive relationships in urban ecologies under worsening conditions of climate change. In “I’m Real When I Shop My Face,” the circulation of glitch feminism by pop artist Sophie across digital media ecologies is examined to demonstrate capacities for queer worldmaking within cisnormative algorithmic architectures. In “All My Happiness Is Gone,” I examine my ecology of depression as enmeshed in complex genetic, social, and material entanglement.
ContributorsRife, Tyler (Author) / LeMaster, Loretta (Thesis advisor) / Wise, John (Thesis advisor) / McHugh, Kevin (Committee member) / Arizona State University (Publisher)
Created2021
Description
A description of numerical and analytical work pertaining to models that describe the growth and progression of glioblastoma multiforme (GBM), an aggressive form of primary brain cancer. Two reaction-diffusion models are used: the Fisher-Kolmogorov-Petrovsky-Piskunov equation and a 2-population model that divides the tumor into actively proliferating and quiescent (or necrotic) cells. The numerical portion of this work (chapter 2) focuses on simulating GBM expansion in patients undergoing treatment for recurrence of tumor following initial surgery. The models are simulated on 3-dimensional brain geometries derived from magnetic resonance imaging (MRI) scans provided by the Barrow Neurological Institute. The study consists of 17 clinical time intervals across 10 patients that have been followed in detail, each of whom shows significant progression of tumor over a period of 1 to 3 months on sequential follow up scans. A Taguchi sampling design is implemented to estimate the variability of the predicted tumors to using 144 different choices of model parameters. In 9 cases, model parameters can be identified such that the simulated tumor contains at least 40 percent of the volume of the observed tumor. In the analytical portion of the paper (chapters 3 and 4), a positively invariant region for our 2-population model is identified. Then, a rigorous derivation of the critical patch size associated with the model is performed. The critical patch (KISS) size is the minimum habitat size needed for a population to survive in a region. Habitats larger than the critical patch size allow a population to persist, while smaller habitats lead to extinction. The critical patch size of the 2-population model is consistent with that of the Fisher-Kolmogorov-Petrovsky-Piskunov equation, one of the first reaction-diffusion models proposed for GBM. The critical patch size may indicate that GBM tumors have a minimum size depending on the location in the brain. A theoretical relationship between the size of a GBM tumor at steady-state and its maximum cell density is also derived, which has potential applications for patient-specific parameter estimation based on magnetic resonance imaging data.
ContributorsHarris, Duane C. (Author) / Kuang, Yang (Thesis advisor) / Kostelich, Eric J. (Thesis advisor) / Preul, Mark C. (Committee member) / Crook, Sharon (Committee member) / Gardner, Carl (Committee member) / Arizona State University (Publisher)
Created2023
Description
The most advanced social insects, the eusocial insects, form often large societies in which there is reproductive division of labor, queens and workers, have overlapping generations, and cooperative brood care where daughter workers remain in the nest with their queen mother and care for their siblings. The eusocial insects are composed of representative species of bees and wasps, and all species of ants and termites. Much is known about their organizational structure, but remains to be discovered.
The success of social insects is dependent upon cooperative behavior and adaptive strategies shaped by natural selection that respond to internal or external conditions. The objective of my research was to investigate specific mechanisms that have helped shaped the structure of division of labor observed in social insect colonies, including age polyethism and nutrition, and phenomena known to increase colony survival such as egg cannibalism. I developed various Ordinary Differential Equation (ODE) models in which I applied dynamical, bifurcation, and sensitivity analysis to carefully study and visualize biological outcomes in social organisms to answer questions regarding the conditions under which a colony can survive. First, I investigated how the population and evolutionary dynamics of egg cannibalism and division of labor can promote colony survival. I then introduced a model of social conflict behavior to study the inclusion of different response functions that explore the benefits of cannibalistic behavior and how it contributes to age polyethism, the change in behavior of workers as they age, and its biological relevance. Finally, I introduced a model to investigate the importance of pollen nutritional status in a honeybee colony, how it affects population growth and influences division of labor within the worker caste. My results first reveal that both cannibalism and division of labor are adaptive strategies that increase the size of the worker population, and therefore, the persistence of the colony. I show the importance of food collection, consumption, and processing rates to promote good colony nutrition leading to the coexistence of brood and adult workers. Lastly, I show how taking into account seasonality for pollen collection improves the prediction of long term consequences.
The success of social insects is dependent upon cooperative behavior and adaptive strategies shaped by natural selection that respond to internal or external conditions. The objective of my research was to investigate specific mechanisms that have helped shaped the structure of division of labor observed in social insect colonies, including age polyethism and nutrition, and phenomena known to increase colony survival such as egg cannibalism. I developed various Ordinary Differential Equation (ODE) models in which I applied dynamical, bifurcation, and sensitivity analysis to carefully study and visualize biological outcomes in social organisms to answer questions regarding the conditions under which a colony can survive. First, I investigated how the population and evolutionary dynamics of egg cannibalism and division of labor can promote colony survival. I then introduced a model of social conflict behavior to study the inclusion of different response functions that explore the benefits of cannibalistic behavior and how it contributes to age polyethism, the change in behavior of workers as they age, and its biological relevance. Finally, I introduced a model to investigate the importance of pollen nutritional status in a honeybee colony, how it affects population growth and influences division of labor within the worker caste. My results first reveal that both cannibalism and division of labor are adaptive strategies that increase the size of the worker population, and therefore, the persistence of the colony. I show the importance of food collection, consumption, and processing rates to promote good colony nutrition leading to the coexistence of brood and adult workers. Lastly, I show how taking into account seasonality for pollen collection improves the prediction of long term consequences.
ContributorsRodríguez Messan, Marisabel (Author) / Kang, Yun (Thesis advisor) / Castillo-Chavez, Carlos (Thesis advisor) / Kuang, Yang (Committee member) / Page Jr., Robert E (Committee member) / Gardner, Carl (Committee member) / Arizona State University (Publisher)
Created2018
Description
In recent decades, marine ecologists have conducted extensive field work and experiments to understand the interactions between bacteria and bacteriophage (phage) in marine environments. This dissertation provides a detailed rigorous framework for gaining deeper insight into these interactions. Specific features of the dissertation include the design of a new deterministic Lotka-Volterra model with n + 1 bacteria, n
+ 1 phage, with explicit nutrient, where the jth phage strain infects the first j bacterial strains, a perfectly nested infection network (NIN). This system is subject to trade-off conditions on the life-history traits of both bacteria and phage given in an earlier study Jover et al. (2013). Sufficient conditions are provided to show that a bacteria-phage community of arbitrary size with NIN can arise through the succession of permanent subcommunities, by the successive addition of one new population. Using uniform persistence theory, this entire community is shown to be permanent (uniformly persistent), meaning that all populations ultimately survive.
It is shown that a modified version of the original NIN Lotka-Volterra model with implicit nutrient considered by Jover et al. (2013) is permanent. A new one-to-one infection network (OIN) is also considered where each bacterium is infected by only one phage, and that phage infects only that bacterium. This model does not use the trade-offs on phage infection range, and bacterium resistance to phage. The OIN model is shown to be permanent, and using Lyapunov function theory, coupled with LaSalle’s Invariance Principle, the unique coexistence equilibrium associated with the NIN is globally asymptotically stable provided that the inter- and intra-specific bacterial competition coefficients are equal across all bacteria.
Finally, the OIN model is extended to a “Kill the Winner” (KtW) Lotka-Volterra model
of marine communities consisting of bacteria, phage, and zooplankton. The zooplankton
acts as a super bacteriophage, which infects all bacteria. This model is shown to be permanent.
+ 1 phage, with explicit nutrient, where the jth phage strain infects the first j bacterial strains, a perfectly nested infection network (NIN). This system is subject to trade-off conditions on the life-history traits of both bacteria and phage given in an earlier study Jover et al. (2013). Sufficient conditions are provided to show that a bacteria-phage community of arbitrary size with NIN can arise through the succession of permanent subcommunities, by the successive addition of one new population. Using uniform persistence theory, this entire community is shown to be permanent (uniformly persistent), meaning that all populations ultimately survive.
It is shown that a modified version of the original NIN Lotka-Volterra model with implicit nutrient considered by Jover et al. (2013) is permanent. A new one-to-one infection network (OIN) is also considered where each bacterium is infected by only one phage, and that phage infects only that bacterium. This model does not use the trade-offs on phage infection range, and bacterium resistance to phage. The OIN model is shown to be permanent, and using Lyapunov function theory, coupled with LaSalle’s Invariance Principle, the unique coexistence equilibrium associated with the NIN is globally asymptotically stable provided that the inter- and intra-specific bacterial competition coefficients are equal across all bacteria.
Finally, the OIN model is extended to a “Kill the Winner” (KtW) Lotka-Volterra model
of marine communities consisting of bacteria, phage, and zooplankton. The zooplankton
acts as a super bacteriophage, which infects all bacteria. This model is shown to be permanent.
ContributorsKorytowski, Daniel (Author) / Smith, Hal (Thesis advisor) / Gumel, Abba (Committee member) / Kuang, Yang (Committee member) / Gardner, Carl (Committee member) / Thieme, Horst (Committee member) / Arizona State University (Publisher)
Created2016
Description
Performing the Electrical traces the histories and futures of electrical discovery and knowledge through cultural performances, socio-political assemblages, and the more-than-human worldmaking functions of energy in general and electricity in particular, or what I refer to as energy-as-electricity. This project seeks to transform how energy-as-electricity is perceived, and thereby to re-vision the impact that energy-rich relationships might have ecologically—in both the social and environmental senses of the word. As a practice-led inquiry I use my scenographic sensibilities in combination with performance studies and energy humanities lenses to identify how energy-scapes form through social performances, material relations, and aesthetic/ritualistic interventions. This approach allows me to synthesize vastly different scales of energy-as-electricity performatives and spatialities and propose alternative framings which work towards decolonizing and re-feminizing energy-rich relationships. This research considers the way power flows, accumulates, and transforms through performance as embodied expression, practice and eventful doings of human and more-than-human agents. It asks: if place is practiced space (Henri Lefebvre), how can decolonizing and re-feminizing energy-rich relationships transform normative power relationships (or power geometries, as cultural geographer Doreen Massey refers to such globalized interconnections)—which are formed through electricity, technologies and colonial-capitalism? I ground this inquiry as an ecological intervention in order to investigate how performing with electricity differently (both in collective imaginations and quotidian interactions), can change the ways that electricity is produced and consumed in the time of the Anthropocene, Capitalocene, and Plasticene. The following study produces written and tacit knowledge that expands the framing of energy-rich relationships shared between human and more-than-human performatives. My provocation is that experiential encounters are critical for expanding the ontological plurality of energy-as-electricity with ecological a/effect. Drawing on the insights of performance scenographer Rachel Hann, I demonstrate that scenographic methodologies in an expanded field, along with embodied sensing, provide productive insights into this endeavor of expansion. This project both serves as a space making/space keeping provocation and offers a methodology for devising more desirable futures.
ContributorsFoster Gluck, Geneva (Author) / Underiner, Tamara (Thesis advisor) / Hunt, Kristin (Committee member) / McHugh, Kevin (Committee member) / Arizona State University (Publisher)
Created2020