Graduate Theses & Dissertations


Eco-evolutionary Dynamics in a Commercially Exploited Freshwater Fishery
Fisheries assessment and management approaches have historically focused on individual species over relatively short timeframes. These approaches are being improved upon by considering the potential effects of both broader ecological and evolutionary processes. However, only recently has the question been raised of how ecological and evolutionary processes might interact to further influence fisheries yield and sustainability. My dissertation addresses this gap in our knowledge by investigating the role of eco-evolutionary dynamics in a commercially important lake whitefish fishery in the Laurentian Great Lakes, a system that has undergone substantial ecosystem change. First, I link the timing of large-scale ecological change associated with a species invasion with shifts in key density-dependent relationships that likely reflect declines in the population carrying capacity using a model selection approach. Then, using an individual-based model developed for lake whitefish in the southern main basin of Lake Huron, I demonstrate how ecosystem changes that lower growth and recruitment potential are predicted to reduce population productivity and sustainable harvest rates through demographic and plastic mechanisms. By further incorporating an evolutionary component within an eco-genetic model, I show that ecological conditions also affect evolutionary responses in maturation to harvest by altering selective pressures. Finally, using the same eco-genetic model, I provide a much-needed validation of the robustness of the probabilistic maturation reaction norm (PMRN) approach, an approach that is widely used to assess maturation and infer its evolution, to ecological and evolutionary processes experienced by exploited stocks in the wild. These findings together highlight the important role that ecological conditions play, not only in determining fishery yield and sustainability, but also in shaping evolutionary responses to harvest. Future studies evaluating the relative effects of ecological and evolutionary change and how these processes interact in harvested populations, especially with respect to freshwater versus marine ecosystems, could be especially valuable. Author Keywords: Coregonus clupeaformis, density-dependent growth, fisheries-induced evolution, individual-based eco-genetic model, Lake Huron, stock-recruitment
Tourism Around Yellowknife
Yellowknife, which began as a gold-mining town in the 1930s, developed into a modern city and the territorial capital. Yellowknife is a popular destination for tourism with yearly growing numbers that reflect aurora viewers, business travel, general touring and visiting friends and relatives. Consequently, tourism in the Yellowknife area is increasing in volume and is of growing economic significance. Municipal and territorial governments actively advance its expansion, with the City’s 2015-2019 Tourism Strategy directed at infrastructure and service enhancement. While diamond tourism, as envisioned in 2004, did not progress, the Indigenous population in the territory is developing and executing community-based tourism plans. Utilizing Grounded Theory, this study demonstrates that governmental and stakeholder support proves dedication and commitment to the local tourism industry for years into the future. Yellowknife and its citizens take firm measures to attract increasing numbers of visitors in recognition of the value of tourism to their community. Author Keywords: Aurora borealis, Diamond industry, Government involvement, Northwest Territories economy, Tourism, Yellowknife
Securitization, Borders, and the Canadian North
Canada takes a national approach to border management. While this ensures that security practices are consistent across the country, it also fails to consider that different regions in Canada may have their own border needs. This dissertation, therefore, seeks to determine if border management priorities in Northern Canada are the same as in Southern Canada, along the 49th parallel. To make this determination, three sets of federal government documents are analyzed. First, documents associated with the current Beyond the Border Action Plan are explored to better understand security priorities and if regions are considered. Next, documents that are associated with Northern security and regional governance are analyzed in order to illuminate regional security issues and determine where borders fit within this narrative. The final set of documents to be examined are Senate reports on Northern security, as they can provide a glimpse into how regional security agendas are set. Grounded theory is used to illicit key themes from all documents and political discourse analysis is applied to the Senate reports to assess the strength of securitizing arguments for the region. Securitization theory and the Copenhagen School’s five security sectors are used to frame the analysis. This approach allows for a more comprehensive understanding of the region’s security priorities and the extent of the interplay between the sectors. The concept of regional security complexes is also addressed to determine the extent to which bilateral border cooperation exists in the North. Analysis reveals that border security priorities are not the same in the North as they are in the South. For example, in the North, greater emphasis is placed on protecting maritime borders, whereas in the South, land and air borders are prioritized. Beyond the Border aligns more closely with the needs of the Southern border, thus leaving a policy and security gap in the North. Bilateral border and security cooperation are also much more prevalent in the South than in the North. This research concludes with three policy suggestions to close this gap and addresses the extent to which it is in Canada’s interest to work more closely with the United States in the North. Author Keywords: Arctic, Borders, Canada, Policy, Regions, Securitization theory
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
History Majors During the Humanities Crisis
This qualitative case study explored the experience of members and associates of one university history department in order to examine the phenomena of choosing and working within the history major in the context of current declines in humanities enrolment. Drawing on interviews with 7 professors, 8 student majors, and 10 professional staff, it analyzed beliefs about how students should choose their majors, benefits of historical thinking, the current climate of crisis in history, and resources to support history students. Participants agreed that students should choose a major based on intrinsic factors and shared a common vision of the meaning and importance of historical thinking. However, participants experienced tension between these intrinsic values and extrinsic pressures regarding the humanities crisis and the efficacy of student-support resources. These results have implications for understanding pressures felt by current humanities students and for developing new resources to better support history majors. Author Keywords: case study, choice of major, historical thinking, history department, humanities crisis, student affairs
Ludic Fictions, Lucid Games
This thesis elucidates the role of play and games—the ludic—in Julio Cortázar’s novel Hopscotch (1966; translation of Rayuela, 1963) through a range of resonant theories. Literary gameplay dominates the formal, linguistic, affective, reflexive, and thematic dimensions of Hopscotch, which are analyzed through concepts borrowed from play theorist Roger Caillois, among others, and literary theorists including Mikhail Bakhtin and Wolfgang Iser, whose ludic theories of fiction begin to map the field of ludic fiction. The analysis positions Hopscotch as an exemplar of the ludic counter-tradition within the novel, a perennial tendency from Don Quixote to postmodernism and beyond. Hopscotch, like other ludic fictions, enacts a complex convergence of the ludic and the lucid. It provokes active reading over passive consumption, diminishes the hegemonic function of serious mimesis to elevate other forms of gameplay, notably chance, competition, vertigo, and enigma, to dominant positions, and ultimately demonstrates a profound affinity between play and critical consciousness. Author Keywords: Bakhtin, Cortazar, Iser, Ludic, Novel, Play
Uncovering the Barriers to Sustainable Music Consumption
The study sought to uncover the motivations influencing collectors when they buy recorded music. These motivations were analyzed through the lenses of environmental, economic, and cultural sustainability. Trent Radio Programmers were interviewed because of their frequent use of recorded music, sizable collections, and active participation in the local music scene. The study identified disconnects between artist, industry, and consumer motivations that hinder the achievement of a sustainable system. Environmental sustainability was not considered, while the artists’ economic and cultural sustainability were. This finding translates to the idea that in the music industry, to strengthen cultural sustainability, economics must be supported, which requires environmental impact. This research has the potential to catalyze critical conversations about digital media, artist welfare, and the state of the music industry. Author Keywords: College Radio, Cultural Sustainability, Economic Sustainability, Environmental Sustainability, Music Collecting
cis-Cytokinins from the tRNA-degradation pathway impact the phenotype and metabolome of Arabidopsis thaliana
Cis-isomers of the cytokinin plant hormone family are thought to have low activity or impact on plant growth and development. Mutants with independent silencing of the pathway leading to cis-CK (cis-cytokinin) were investigated at the phenotype and metabolite levels. Phenotypic deviations were noted in trichome development, fresh weight, rosette diameter, number of non-rosette leaves, shoot height, delayed flowering, flower number, and carotenoids. Exploratory metabolomic analysis detected a number of metabolite features that have been associated with CK, auxin, and ABA (abscisic acid) activity. Evidence from both phenotype and metabolomic analysis support the hypothesis that cis-CK production is biologically important for plant growth and development. Author Keywords: arabidopsis, cytokinin, IPT, metabolmics
spatial and temporal distribution of tabanid (Chrysops, Hybomitra and Tabanus) species in the Nakina district of northwestern Ontario
This thesis focused on expanding knowledge of Hybomitra, Chrysops and Tabanus (Diptera: Tabanidae) distributions north of Lake Nipigon, Ontario, in a managed boreal forest. As land use and climate changes accelerate, there is increased pressure to increase knowledge from which to monitor changes. In 2011 and 2012, 8928 individuals representing, 44 species were captured using sweep netting. Major northward range extensions were observed for Chrysops shermani, C. aberrans and Tabanus fairchildi. Smaller range extensions and in-fills were observed for another 15 species. 23 species had exntensions to their previously known seasonal range. C. carbonarius was the only species that showed an extension to both sides of its season. In general, harvested stands had 50% more individuals and 30% greater species richness than younger stands. A possible link between stand age and interspecific competition was identified. Information has been provided to build baseline of species richness, relative abundance and distribution of Tabanid flies. Author Keywords: diptera, distribution, natural history, northern Ontario, species range, tabanid
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
Epicentres, Elites, and Entanglement
This thesis investigates the similarities and differences between the tropical epicenters of South and Southeast Asia during the Charter State era, 800- 1400 CE. This study can inform scholars about the relationship between “people and place” by examining the ground plans, activities, and people associated with each epicenter. By using the comparative approach and entanglement theory, this study will examine the ancient states of Central and East Java, Dai Viet in North Vietnam, the Cham in Central Vietnam, the Chola of South India, and the Sinhalese of Sri Lanka. The ancient Maya of tropical Belize will be used as a cross-cultural comparator, which would not have had any contact with the other charter states. An extensive literature review and on-site visitations were necessary to provide the background and date to accomplish these goals. The results indicate striking similarities between tropical epicenters across the Charter States that developed out of the entanglements between humans and things. This thesis will help to further our understanding of tropical urbanism and the nature of epicenters in tropical environments. Author Keywords: Anuradhapura, Caracol, Entanglement, Thang Long, Thanjavur, Urbanism


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