Graduate Theses & Dissertations

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From Toronto to Africville
How can educators use drama to nurture an ability in their students to identify and challenge the discourses and practices that have historically perpetuated oppression and inequality within Canada — without miring them in those narratives of oppression? This dissertation discusses the work of De-Railed, a theatre group that worked with youth in Hamilton Rapids, a Toronto neighbourhood where a high percentage of residents experience racial discrimination and poverty, to create a play about the destruction of Africville, a historically Black community in Halifax, NS. Drawing from the methodologies of critical, performance, and imaginative ethnography; critical multiculturalism; theatre of the oppressed; and feminist critical pedagogy, this dissertation argues that while participants used the fictional and intersubjective nature of drama to express embodied and affective resistance to class- and race-based oppressions in Canada’s past and present, the play-building process also reproduced certain unequal disciplinary structures that De-Railed was attempting to challenge. Emphasizing the importance of creating space for young people’s expressions of negative affect and emotion, this dissertation considers both the potentialities and limitations of De-Railed’s application of theatre of the oppressed methods in enabling participants to engage in affective expressions of resistance that may not have been permissible or available in other areas of their lives. Author Keywords: Africville, feminist critical pedagogy, forum theatre, multiculturalism, performance ethnography, theatre of the oppressed
Habitat Characteristics, Density Patterns and Environmental Niches of Indo-Pacific Humpback Dolphins (Sousa chinensis) of the Pearl River Estuary and Eastern Taiwan Strait
The purpose of this thesis is to quantify the habitat characteristics, density patterns and environmental niches of two groups of Indo-Pacific humpback dolphins: Chinese white dolphins (CWD) of the Pearl River estuary (PRE), and Taiwanese white dolphins (TWD, =Taiwanese humpback dolphin, THD) found in the eastern Taiwan Strait (ETS). Much work has already been done on the habitat use of CWDs in parts of the PRE, so the purpose of my first two chapters was to advance knowledge of the TWD to a comparable level. Chapter 2 contains the first published description of the relatively shallow, inshore, estuarine habitat of the TWD. General environmental characteristics and observed group sizes were consistent with other populations of humpback dolphins, and group sizes were not correlated with the environmental variables measured during surveys. Chapter 3 investigated density patterns of TWDs, finding spatiotemporal heterogeneity across the study area. Humpback dolphin densities fluctuated from year to year, but some parts of the study area were consistently used more than others. Environmental characteristics again did not influence dolphin densities, though more dolphins than expected were sighted in waters adjacent to major land reclamations, which may be related to the location of these areas close to major rivers. In Chapter 4, niches of the TWD and CWDs found in the PRE were compared using species distribution models, which indicated significant niche overlap. This may be due to niche conservatism maintaining similar fundamental niches between the two groups since their historical split >10,000 years ago, or a result of the intrinsic biotic factors that influence occurrence data affecting the hypervolume dimensions of each realized niche in similar ways. Geographic predictions indicate that most of the TWD’s range has likely been surveyed, and that there may be connectivity between PRE humpback dolphins and at least one neighbouring putative population due to continuous predicted suitable habitat in waters that remain poorly surveyed. Overall, my thesis demonstrates that density patterns may vary over time, but on a broad temporal scale, these two allopatric groups of Indo-Pacific humpback dolphins have similar habitat requirements in geographically isolated, but environmentally similar locations. Author Keywords: density, habitat, Indo-Pacific humpback dolphin, niche overlap, Sousa chinensis, species distribution model
Effect Assessment of Binary Metal Mixtures of Ni, Cu, Zn, and Cd to Daphnia magna
Mixtures of metals occur in surface waters, toxicity of which has drawn world-wide attention due to their crucial role in both ecotoxicology and regulations. The present research was undertaken to study the acute toxicity of binary mixtures of Ni, Cu, Zn, and Cd to the freshwater organism, Daphnia magna. The experimental approach included single and binary metal toxicity tests based on the 48h acute toxicity bioassay of Environment Canada. The acute toxicity of single metals followed the order of Cd > Cu > Zn > Ni. Based on the calculated 48h EC50 value of single metals, a toxic unit (TU) approach was used to combine two metals in a binary mixture, in which 1TU was equal to the 48h EC50 value of a metal in single exposure. The toxicity of binary metal mixtures to D. magna followed the order of Cu-Cd > Cu-Zn > Zn-Cd > Cu-Ni > Zn-Ni > Cd-Ni, which demonstrated three types of toxicity (i.e., less than additive, additive, and greater additive). Predictions from additivity models (including concentration addition (CA) and independent action (IA) models), a generalized linear model (GLM), and a biotic-ligand-like model (BLM-like) were compared to the bioassay results. The CA and the RA models also predicted three types of toxicity of the binary metal mixtures (i.e., less than additive, additive, and greater than additive). However, the CA model mostly overestimated the toxicity of binary mixtures. Predictions from the GLM supported the inclusion of the interaction between two metals in a mixture to predict the toxicity of binary metal mixtures. The binary metal toxicity was also predicted using a BLM-like model based on the calculated concentrations of free ionic forms of the metals, affinity constants, and toxic potency of each metal. In this model, it was hypothesized that the toxicity of metal mixture is the result of competition of metals with Ca2+ at biotic ligands, which can lead to whole-body deficiency of Ca2+ in D. magna. The BLM-like model provided the toxic potency of single metals with the following order, Cu > Cd > Zn > Ni. Although the prediction of the BLM-like model was not in good agreement with the observed toxicity of binary metal mixtures, an overestimation of risk of mixture toxicity was obtained using this model, which could be promising for use in environmental risk assessment. Author Keywords: biotic ligand model, concentration addition, Daphnia magna, independent action, metal toxicity, modeling
Making Mockeries, Making Connections
Parody has been a strategy within cultural production since the ancient Greeks: “paraodia” referred to a song sung alongside the main narrative thread of a dramatic work; the prefix “para-” also signifies “against.” In A Theory of Parody: The Teachings of Twentieth-century Art Forms, Linda Hutcheon offers this core definition: parody is “a form of repetition with ironic critical distance, marking difference rather than similarity … [with] tension between the potentially conservative effect of repetition and the potentially revolutionary impact of difference” (xii). This and other aspects of Hutcheon’s theory guide my interpretations of works by three contemporary artists working in Canada: Sybil Lamb’s novel I’ve Got a Time Bomb; Ursula Johnson’s (Mi’kmaq) three-part exhibition Mi’kwite’tmn (Do You Remember); and Kent Monkman’s (Cree and Irish) exhibition Shame and Prejudice: A Story of Resilience. I argue that the presence of parodic elements in these artists’ works enables them to do two things: to claim spaces that enable recognition of their subject positions, and to critique an aspect of hegemonic norms in contemporary society. I read Lamb’s novel as a critique of the heteronormative gender binary via parody of the picaresque genre and of heteronormative discourse/language. Certain pieces in Monkman’s exhibition parody the epistemological and display strategies of traditional Eurocentric anthropological museums and archives, as can Johnson’s work; her sculptural-installations may also be read as parodying the traditions of Mi’kmaw basket-making. The work of both artists critiques colonial narratives that sought (and may still seek) to denigrate and/or erase Indigenous peoples; such narratives of cultural genocide were both tacitly and directly propagated by museums. I analyze these three artists’ works, considering key features of parody (ambiguity; irony and “double-voicedness”; trans-contextualization; and humour), and their effects (defamiliarization; ontological instability; complicity; and laughter). Parody challenges the post-structuralist emphasis on the “decoder,” (viewer/reader) reinstating the “encoder” (artist/author) as agent. Decoders recognize their complicity within the context of the hegemonic narrative, whether the heteronormative gender binary or colonialism, and may come to shift perception – as per Hutcheon’s “potentially revolutionary impact.” Author Keywords: contemporary art, Indigenous art, museum history, parody, picaresque, transgender literature
wind tunnel based investigation of three-dimensional grain scale saltation and boundary-layer stress partitioning using Particle Tracking Velocimetry
Aeolian transport of sand particles is an important geomorphic process that occurs over a significant portion of the earth’s land surface. Wind tunnel simulations have been used for more than 75 years to advance the understanding of this process; however, there are still several principles that lack validation from direct sampling of the sand particles in flight. Neither the three-dimensional dispersion of, nor the momentum carried by particles in flight have been properly measured. This has resulted in the inability to validate numerical particle dispersion models and the key boundary-layer momentum partitioning model that serves as the framework for understanding the air-sand feedback loop. The primary impediment to these measurements being made is a lack of tools suited for the task. To this end, this PhD aims to improve existing particle tracking technology, thus enabling the collection of particle measurements during wind tunnel experiments that would address the aforementioned knowledge gaps. Through the design and implementation of the Expected Particle Area Searching method, a fully automated particle tracking velocimetry system was developed with the capability to measure within ½ grain diameter of the bed surface under steady state transport conditions. This tool was used to collect the first 3-D data set of particle trajectories, from which it was determined that a mere 1/8th of sand transport is stream aligned and 95% is contained within ± 45o of the mean wind direction. Particles travelling at increasing spanwise angles relative to the stream aligned flow were found to exhibit different impact and ejection velocities and angles. The decrease in the number of particles with increasing height in the saltation cloud, very close to the bed is observed to transition from a power to a linear relation, in contrast to previous literature that observed an exponential decay with coarser vertical resolution. The first direct measurements of particle-borne stress were captured over a range of wind velocities and were compared with earlier fluid stress measurements taken using Laser Doppler Anemometry. In support of established saltation theory, impacting particle momentum is found to contribute strongly to particle entrainment under equilibrium conditions. In opposition to established theory, however, particle-borne stress was found to reach a maximum above the surface and does not match the change in air-borne stress with increasing distance from the surface. Near surface splashed particles, measured herein for the first time, appear to play a greater role in stress partitioning than previously thought. This study suggests that research is needed to investigate the role of bed load transport on stress partitioning, to differentiate between airborne trajectory types, and to develop particle tracking tools for field conditions. Author Keywords: Aeolian Transport, Eolian Transport, Particle Tracking Velocimetry, Saltation, Stress Partitioning, Wind Tunnel Simulation
Finding Space, Making Place
Independent music venues are important hubs of social activity and cultural production around which local punk scenes are both physically and conceptually organized. Through interactions with participants over extended periods of time, these spaces become meaningful places that are imbued with the energy, history and memories of local music scenes. When a venue is shut down, local punk scenes experience a temporary disruption as participants struggle to begin the process of re-establishing a new autonomous social space free from outsider interference. Therefore, moving from the local, to the national, to the international, from the small and personal to the vast and global, as well as from the physical to the virtual, this dissertation illustrates the actual, everyday practices of local scenes across Canada, addressing the larger issue of the loss of alternative music venues occurring on a global scale and the resulting impact on punk scene participants. Through the use of ethnographic research methods such as participant observation, photographic documentation, interviews and surveys, this dissertation engages with contemporary punk scene participants in order to give voice to those often ignored in grand narratives of punk history. As such, traditional concepts of punk as a utopic countercultural space are challenged to reveal the complexity and diversity that exists within contemporary local punk scenes, where participants often experience equal amounts of cooperation, competition, tension and struggle. By choosing to engage with contemporary experiences and interpretations of punk culture, this research addresses the changing landscape of local scenes, as punk participants attempt to carve out spaces of representation for themselves in an exceedingly mediated world. Author Keywords: Canada, music venues, punk, scene, social space, subculture
New Interpretations from Old Data
Range contractions and expansions are important ecological concepts for species management decisions. These decisions relate not only to rare and endangered species but to common and invasive species as well. The development of the broad spatiotemporal extent models that are helpful in examining range fluctuations can be challenging given the lack of data expansive enough to cover the time periods and geographic extents needed to fit the models. Archival records such as museum databases and harvest data can provide the spatiotemporal extent needed but present statistical challenges given they represent presence-only location information. In this thesis, I used maximum entropy and Bayesian hierarchical occupancy algorithms fitted with archival presence-only records to develop spatiotemporal models covering broad spatial and temporal extents for snowshoe hare and Canada lynx. These two algorithm types are well suited for presence-only data records and can be adapted to include biological and physical processes, thus improving the ecological realism of the models. Using these modelling methods, I found the extent of occurrence (EOO) and area of occupancy (AOO) varied greatly over time and space for both snowshoe hare and Canada lynx, suggesting that management decisions for these species should include consideration of these variations. While the presence-only data were appropriate for model development and understanding changing values in EOO and AOO, it sometimes lacked the locational accuracy and precision needed to create fine scale ecological analyses, thus resulting in somewhat coarse but potentially relevant conclusions. Author Keywords: Area of occupancy, Bayesian hierarchical models, Canada lynx, Extent of occurrence, Presence-only data, Snowshoe hare
“At least I can feel like I’ve done my job as a mom”
This study examines the household foodwork of low-income mothers in Peterborough, Ontario and considers how community food initiatives (CFIs) such as community gardens and good food box programs can support these women in their efforts to feed their families adequately. I draw on multiple data sources: interviews with representatives from Peterborough CFIs; interviews with and illustrations by 21 local low-income mothers; debrief sessions following participants’ tours of CFIs; and my ongoing involvement with two local food networks. The mothers’ extensive foodwork considerations, strategies, and struggles reflect an engagement with three main ideals that are placed further out of reach through poverty and food insecurity. Women experienced pressure through these ideals: the “good mother,” to take primary responsibility for their children’s well-being through food; the “good consumer,” to participate in society as individual consumers; and the “good food program participant,” to avoid indications of over-reliance on food programs. Each ideal reflects the neoliberal exaltation of self-sufficiency and its flipside, the vilification of dependence. The research results highlight the need for CFIs to focus on the broader, systemic discursive and material challenges that can hamper the foodwork of all low-income mothers, in addition to addressing the immediate needs of their own participants. Towards this goal, Peterborough CFIs employ principles of universality, social inclusion, democratic processes, and broadening of social imaginaries. In their efforts, CFIs must navigate between cultivating collectivity and interdependence on the one hand, and engaging with this familiar, individualizing neoliberal ethos on the other hand. This study provides insights about the subjectivities of low-income mothers that may be useful for CFI programming as well as more analytic examinations of the role and impact of CFIs. It also reveals the common feminization, devaluation, and under resourcing of the food-related work of both mothers and CFIs. In doing so, the study points to the urgent need for broad dialogue and political action regarding poverty, dependence, caring labour, and the roles of citizens and the state in ensuring that households can adequately feed themselves. Author Keywords: Community Food Initiatives, Community Food Programs, Domestic Labour, Food Insecurity, Gendering of Caring Labour, Household Food Work
Bringing Knowledges Together
The natural world and environmental issues present critical points of convergence between Indigenous and non-Indigenous people and their knowledge systems. This qualitative study engaged with 18 Indigenous and non-Indigenous environmental practitioners in interview conversations to explore their experiences in cross-cultural environmental collaborations. The research undertakes a complexity theory approach to answer the following research questions: 1.a) What skills, values, knowledges and approaches do environmental practitioners need to enable Western and Indigenous knowledge systems to come together in addressing environmental challenges? 1. b) What does effectiveness and/or success look like in cross-cultural environmental collaboration? 2. How can post-secondary and professional development educational programs impart the skills, values, knowledges and approaches that their students need to effectively engage in work that brings together Indigenous and non-Indigenous people and their knowledge systems in addressing environmental challenges? This study applied multiple lenses to analyze and interpret the data. The author’s own reflections as both a practitioner and researcher working and teaching in crosscultural environmental contexts were a central component of the study. Through this analysis a set of skills, values, knowledges, approaches, attributes, and roles emerged. The findings reaffirm the importance of respect, relationship, responsibility, and reciprocity as central values in Indigenous praxis and identify additional values. The application of a critical theory lens illuminated that subtle racism and microaggressions influence environmental collaboration between Indigenous and non-Indigenous people. The study proposes a curriculum and program design for post-secondary and professional development contexts, that draws upon multiple pedagogies to prepare learners to work cross-culturally in respectful ways. These findings are relevant to environmental practitioners currently working in the field and contribute to a further articulation of an emerging Indigenous Environmental Studies and Sciences (IESS) pedagogy. Author Keywords: Cross-cultural collaboration, Curriculum Development, Environmental Education, Indigenous Studies, Professional Development
Time to adapt
To better understand species’ resilience to climate change and implement solutions, we must conserve environments that maintain standing adaptive genetic variation and the potential generation of new beneficial alleles. Coding trinucleotide repeats (cTNRs) providing high-pace adaptive capabilities via high rates of mutation are ideal targets for mitigating the decline of species at risk by characterizing adaptively significant populations. Ultimately, adaptive genetic information will inform the protection of biological diversity below the species level (i.e., “Evolutionarily Significant Units” or “ESUs”). This dissertation investigates cTNRs within candidate genes to determine their prevalence and influence under selection in North American mammals. First, I evaluated the potential for somatic mosaicism in Canada lynx (Lynx canadensis), and found that tissue-specific mosaicism does not confound cTNR genotyping success in lynx. Second, I assessed a selection of clock gene cTNRs across characterized mammals and found that these repeats are abundant and highly variable in length and purity. I also identified preliminary signatures of selection in 3 clock gene cTNRs in 3 pairs of congeneric North American mammal species, highlighting the importance of cTNRs for understanding the evolution and adaptation of wild populations. I further evaluated the influence of selection on the NR1D1 cTNR within Canada lynx sampled across Canada using environmental correlation, where I estimated the variation in NR1D1 cTNR alleles explained by environmental and spatial variables after removing the effects of neutral population structure. Although most variation was explained by neutral structure, environment and spatial patterns in eastern lynx populations significantly explained some of the variation in NR1D1 alleles. To examine the role of island populations in the generation and distribution of adaptive genetic variation, I used 14 neutral microsatellites and a dinucleotide repeat within a gene linked to mammalian body size, IGF-1, and found that both genetic drift and natural selection influence the observed genetic diversity of insular lynx. Finally, I estimated the divergence dates of peripheral lynx populations and made recommendations towards the conservation of Canada lynx; high levels of genetic differentiation coupled with post-glacial colonization histories and patterns of divergence at cTNR loci suggest at least 4 ESUs for Canada lynx across their range. Author Keywords: adaptation, Canada lynx, candidate genes, coding trinucleotide repeats, evolution, natural selection
Code of Bimadiziwin
Indigenous peoples and organizations have a long history of incorporating cultural knowledge and teachings into program and organizational design and structure. The approach to incorporating cultures into Indigenous organizations is not uniform, nor is the ways that they are understood. This dissertation focuses on Nogojiwanong Friendship Centre, in Peterborough Ontario and their approach to incorporating Indigenous cultures into their organization from 2010-2014. The intention of this dissertation is to build knowledge of Indigenous perspectives of organizational structure, grounded in Anishinabe teachings. The teaching circle, vision- time – feeling –movement, guides my learning process and the structure of the dissertation. In using an Anishinabe framework the importance of relationships and the Anishinabe clan system are foundational to my understanding, and will be discussed at length. The purpose and goal of this research is twofold. First, to show the complexity, intentionality and depth to an Indigenous research process; a process that is often nuanced in the literature. Second, to show how Anishinabe thought can (and does) provide a framework for a service delivery organization, in its governance and program and service delivery. The thesis of this dissertation is that Anishinabe knowledge is not always visible to outsiders, but it was present at Nogojiwanong Friendship Centre in the ways they approached research, governed themselves and delivered programs and services. Key Words: Indigenous Knowledge, Indigenous Governance, Indigenous Research Ethics, Indigenous Research Framework Author Keywords: Indigenous Governance, Indigenous Knowledge, Indigenous Research Ethics, Indigenous Research Framework
Fate and Effects of Silver Nanoparticle Addition in a Lake Ecosystem
The potential release of nanoparticles into aquatic environments is raising global concerns. As antimicrobials, silver nanoparticles (AgNPs) are among the most prominent form in use. Despite this, their fate, long-term toxicity, and ecological relevance have yet to be investigated largely under natural settings with seasonality and environmental complexity. To better understand the environmental significance, we released AgNPs into Lake 222 at the Experimental Lakes Area over two years. AgNPs remained suspended in the water column and were detected throughout the lake and in the lower food web. Total Ag concentrations ranged from below 0.07 to 18.9 μg L-1 in lake water, and were highly dynamic seasonally both in the epilimnion and hypolimnion depending on the physical, chemical and biological conditions of the lake. Approximately 60% of the measured Ag mass in October was present in the sediment in 2014 and 50% in 2015 demonstrating relatively high sedimentation and removal from the water column. During winter months, Ag was largely absent in the water column under the ice. After ice melt and before summer stratification, Ag concentrations increased in the lake suggesting AgNPs may not be tightly bound to the sediment and are able re-enter the water column during spring mixing events. Despite temporal variation, total Ag was highly synchronous across spatial locations for both years, indicating rapid dispersal upon lake entry. When investigating AgNP sizes using spICPMS, size distributions were similar across spatial locations, with the 40-60 nm size class constituting approximately 60% of all particles identified. Large aggregates (>100 nm) and dissolved Ag were infrequently detected within the lake. Ag accumulated in the lower food web ranging from 0.27-16.82 μg Ag mg C-1 in the bacterioplankton and 0.17-6.45 μg Ag mg C-1 in algae (particulate fraction). Partial least squares models revealed the highest predictors of Ag accumulation were dissolved nutrients including DOC, TDN, TDP in bacterioplankton. Major predictors for particulate Ag included temperature, dissolved oxygen, and sampling date. The diversity of predictors among biological compartments emphasizes the importance of understanding the role of environmental complexity within the lower food web. Despite Ag accumulation we did not detect strong negative effects on the lake food web. An increase in particulate and bacterioplankton chlorophyll-a occurred after addition in contrast to reference lakes, which may indicate a hormetic response to low dose AgNP concentrations. Our findings provide the first whole-lake perspective regarding Ag fate and toxicity, suggesting small scale experiments may overestimate environmental responses. Author Keywords: Ecotoxicity, Fate, Lower food web, Silver Nanoparticles, Whole-lake addition

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Graduate student theses produced at Trent University. You may also browse theses and dissertations by year, program, or author.

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