Graduate Theses & Dissertations

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Factors Controlling Peat Chemistry and Vegetation Composition in Sudbury Peatlands after 30 Years of Emission Reductions
Peatlands are prevalent in the Sudbury, Ontario region. Compared with the well documented devastation to the terrestrial and aquatic ecosystems in this region, relatively little work has been conducted on the peatlands. The objective of this research was to assess factors controlling peat and plant chemistry, and vegetation composition in 18 peatlands in Sudbury after over 30 years of emission reductions. Peatland chemistry and the degree of humification varies considerably, but sites closer to the main smelter had more humified peat and the surface horizons were enriched in copper (Cu) and nickel (Ni). Copper and Ni concentrations in peat were significantly correlated with Cu and Ni in the plant tissue of leatherleaf, although the increased foliar metal content did not obviously impact secondary chemistry stress indicators. The pH and mineral content of peat were the strongest determining factors for species richness, diversity and community composition. The bryophyte communities appear to be acid and metal tolerant, although Sphagnum mosses are showing limited recovery. Author Keywords: anthropogenic emissions, bryophytes, community comspoition, heavy metals, peatlands, wetland vegetation
Analyzing the Effectiveness of Social Movements Opposing Fossil Fuel Infrastructure
Blocking fossil fuel infrastructure projects like pipelines is increasingly being seen as a legitimate way for civil society groups to reduce global carbon emissions. This research project is an exploratory case study of the Trans Mountain pipeline in British Columbia and its opposition. My research question asks, ‘What has each tactic/strategy of opposition in the campaign to stop the Trans Mountain pipeline expansion accomplished, and how have they been effective? How can they be done more effectively?’ Through interviews and an autoethnography, my research explores the effectiveness of activists in this campaign. I analyze the results of my findings within social movement theory and other activist definitions of effectiveness from my literature review. The more significant findings from my research are that activists need to do a better job educating the public on the issue, need to direct more of their resources towards promoting a solution to the issue and make alliances with other movements and groups. This research project contributes to the literature on the effectiveness of oppositional strategies and tactics of pipeline resistance, as well as social movement theory. Author Keywords: British Columbia, pipeline, protest, strategy, tactic, Trans Mountain
Dynamics and Mechanisms of Community Assembly in a Mined Carolinian Peatland
Theoretical work on community recovery, development, stability, and resistance to species invasions has outpaced experimental field research. There is also a need for better integration between ecological theory and the practice of ecological restoration. This thesis investigates the dynamics of community assembly following peat mining and subsequent restoration efforts at Canada's most southerly raised bog. It examines mechanisms underlying plant community changes and tests predictions arising from the Dynamic Environmental Filter Model (DEFM) and the Fluctuating Resource Hypothesis (FRH). Abiotic, biotic and dispersal filters were modified to test a conceptual model of assembly for Wainfleet Bog. Hydrology was manipulated at the plot scale across multiple nutrient gradients, and at the whole bog scale using peat dams. Trends in time series of hydrological variables were related to restoration actions and uncontrolled variables including precipitation, evapotranspiration and arrival of beaver. Impacts of a changing hydrology on the developing plant community were compared with those from cutting the invasive Betula pendula. Transplanting experiments were used to examine species interactions within primary and secondary successional communities. Seedlings of B. pendula and the native Betula papyrifera were planted together across a peat volumetric water content (VWC) gradient. Impacts of beaver dams were greater than those of peat dams and their relative importance was greatest during periods of drought. Cutting of B.pendula had little effect on the secondary successional plant community developing parallel to blocked drains. Phosphorus was the main limiting nutrient with optimum levels varying substantially between species. Primary colonisers formed a highly stable, novel plant community. Stability was due to direct and indirect facilitative interactions between all species. Reduction in frost heaving was the major mechanism behind this facilitation. Interactions within the secondary successional community were mostly competitive, driven by light and space availability. However, restricted dispersal rather than competition limited further species recruitment. Predictions based on the DEFM were partially correct. A splitting of this model's biotic filter into competition and facilitation components is proposed. There was little support for the FRH based on nutrient levels and VWC. B. pendula had higher germination and growth rates, tolerance to a wider range of peat VWCs and a greater resistance to deer browsing than native birch. Peat mining, combined with restoration actions and the arrival of beaver has moved much of the bog back to an earlier successional stage circa 350+ years BP. Evidence points to B. pendula being a "back-seat driver" in the ecosystem recovery process. Indirect facilitation of a native by an exotic congener, mediated through herbivory, has not been described previously. Shifts in relative contributions of facilitation, competition and dispersal limitations to community assembly may be useful process-oriented measures for gauging progress in restoration. Author Keywords: Betula pendula, community assembly, competition, facilitation, peatland, restoration
Robert Bringhurst and Polyphonic Poetry
Robert Bringhurst states that polyphonic art is a faithful, artistic reflection of the multiplicity of the world’s ecosystems. This ecocritical perspective recognizes that human art informs our understandings of the world, and therefore artists have a moral obligation towards that world. In Chapter One I argue that mimesis should be reclaimed as a useful literary category since all art, regardless of intentions, has an effect on both culture and the natural world. In Chapter Two I argue that by reconnecting publishing craft and philosophy, our books can serve to bring us more in tune with the structures of the natural world. I conclude in Chapter Three by asking how a counterpublic consciousness can be cultivated, and how Bringhurst’s mission of transforming culture might be fully realized. Altogether, this view of literature offers an antidote to Western culture’s destructive tendencies towards the natural world. Author Keywords: Bringhurst, ecocriticism, mimesis, poetry, polyphony, typography
University Aged Millennials' Attitudes and Perceptions Toward Vehicle Ownership and Car Sharing
Car-sharing may have the potential to contribute to a more sustainable transportation system. The current research sought to answer the question: what are university-aged Millennials' perceptions and attitudes toward the adoption of vehicle sharing and private vehicle ownership? The research consisted of hosting six interactive focus group sessions with Millennial students, who currently do not own vehicles. Using a qualitative approach, I analyzed the discussions through a social practice theory lens. I suggest that skills, meanings, materials, and social interactions have an influence on the way in which a transportation option is perceived by Millennials. The results revealed that social norms surrounding vehicle ownership and car sharing are being developed, shaped, changed, challenged and reconstructed. If car-sharing businesses, universities, and governments wish to progress toward a more sustainable transportation system, they should recognize the importance of marketing. Author Keywords: Car ownership, Car sharing, Millennials, Sustainability, Transportation, University
Community and conservation
Faced with the intersecting environmental crises of the 21st century, conservation organizations are searching for practices that produce better, more sustainable outcomes. However, they have often relied on forms of conservation which shore up rather than disrupt settler relationships to land in the form of fortress conservation and assumptions about the human-nature dualism. In this thesis, I examine a local land trust that intends to include community[-based] conservation into its conservation practices. In particular, I explore how the organization’s volunteers understand and construct the relationship between community and conservation, and the ways this might impact operations. Using a community-based research approach, interviews (n=17) were conducted. The findings indicate that the volunteers are demographically homogenous, leading to a homogenous, Western-science informed understanding of community[-based] conservation. This perspective views involvement of community as a direct trade-off with optimal ecological goals. As the volunteers wield uncommon power in organizational governance, difference in opinions toward missions or operations could lead to constraints on the organization. This study contributes to larger academic discourses on environmental volunteers, land trusts, and frames of conservation, and provides tangible recommendations to an organization attempting to include community[-based] conservation in its practices. Author Keywords: community-based conservation, environmental governance, environmental volunteers, frames of conservation, land trusts, power
Factors Influencing the Prioritization of Sites for Conservation on Private Land in Southern Ontario
Conservation organizations use strategic prioritization methods to order complex environments, evaluate landscapes, and distribute efficiently resources for conservation. This study explores how strategic prioritization decisions are made, drawing on a case study of the Nature Conservancy of Canada (NCC). This thesis identifies the factors affecting prioritization and their influence on the public perception of the NCC. The case study revealed that the NCC utilizes comprehensive science-based methods when prioritizing for conservation but its methods are also influenced by the 'opportunity function' (funding, threats, public/political support). How these factors are communicated depends on the audience (e.g. NCC Conservation Blueprints stress the scientific value of the environment; the NCC uses its media sources to emphasize the human-environment connection). These differences indicate the multi-dimensional nature of planning for conservation, its links to values emerging from science, politics, and society, and the need for collaborative conservation efforts and earning and maintaining public trust. Author Keywords: biodiversity conservation priorities, collaboration, Nature Conservancy of Canada, opportunity function, private conservation organizations, science-based conservation
Abundance and Distribution of Microplastics in Lake Scugog Catchment, Ontario
Plastic pollution is a growing concern, owing to its durability, ubiquity, and potential health impacts. The overall objective of this study was to assess the abundance and distribution of microplastics within Lake Scugog catchment, Ontario. This was fulfilled through two tasks (i) the development of a microplastic particle budget for the lake catchment, and (ii) the determination of the dry deposition of atmospheric microplastics in Port Perry, Ontario. The total input of microplastics into Lake Scugog (atmospheric deposition and stream inflow) was 2491 x106 mp/day, while the output (lake outflow and sedimentation) was 1761 x106 mp/day, suggesting that 29% of inputs were retained in the lake. The dry deposition of microplastics in Port Perry was 1257 mp/m2/day, which was high when compared to bulk deposition (37 mp/m2/day) in the same area. By quantifying the major pathways of microplastics better management techniques can be implemented. Author Keywords: Catchment, Dry Deposition, Microplastics, Ontario, Particle Budget, Plastic pollution
Understanding Dimensions of Environmental Sustainability in a Northern Indigenous Context
Although the concept of environmental sustainability has become increasingly popular, the literature offers little practical guidance to direct priorities or actions to support environmental sustainability in northern Indigenous communities. A case study in Hopedale, Nunatsiavut, and a systematic literature review was undertaken to understand: 1) what aspects of the local environment are of value to a northern Indigenous community; and 2) what does existing literature identify as key elements of a community-based approach to monitor valued aspects of the environment in a northern Indigenous context. Hopedale residents spoke to the importance of going off on the land and identified a number of categories of places in their local environment of importance to them, including: 1) valued areas for human-use, 2) areas to protect, 3) areas of environmental concern, and 4) areas to monitor. The systematic literature review highlighted trends on community-based monitoring (CBM) publications, and identified key 13 elements of CBM approaches that are pertinent to northern Indigenous communities. Insights from this study will inform environmental planning and management in the case community of Hopedale, as well as offer guidance to enhance current and future CBM activities in the North and elsewhere. Author Keywords: community-based monitoring, environmental sustainability, Inuit, Labrador, participatory mapping, systematic literature review
Nature without Balance
This thesis critically analyses the connection between ideology and nature, and in particular, aims to reflect on the dominant discourses on the topic of ecological crisis. The ecological thought framework that I adhere to rests on a combination of Frankfurt School and Žižekian theories. This combination is not without serious tensions and deviations; however, central to this project are the ways in which their respective works extensively critique ideology, and propose subversive alternatives to and new meanings of how we can conceptualize nature without domination. Dominant ideas and critiques of nature and natural history emerged during the Enlightenment era, and as Adorno argues, fell victim to a “reduction ad hominem,” or the claim that in order to free oneself, one must dominate, appropriate, and master nature. I claim that the extreme choices in environmental politics today - namely organic populism on one hand and increased technological intervention on the other - fail to account for the ways ‘nature’ is a socio-historical construct, and moreover, is situated within a false reality wherein the ‘essence of existence’ is reduced to technological mastery. What we encounter in this cautionary armoury of paradoxical approaches to nature, then, is the ideological currents of established belief systems. By exposing the illusions within the concept nature, such as the argumentative persuasion that there exists an inherent balance, the elementary cell of ideology reveals itself alongside revolutionary possibilities. Author Keywords: Crises, Critical Theory, Ideology, Nature, Slavoj Zizek, Theodor Adorno
Investigation of Air Recirculation and Thermal Efficiency within a Climate Controlled Passage
Historically, entrances have been used for passage between two separate temperature environments, such as moving from inside to outside of a building. Energy loss through entrances is a cause for concern, as it has been known to increase energy consumption to replace the lost energy; and with the exchange of air masses and cold air entering the building, human discomfort may occur. In this research, thermal efficiency and air circulation within a Conventional Entrance (CE) and Climate Controlled Passage (CCP) are compared. A small scale model of the CE and CCP was constructed to examine forty-eight energy exchange conditions, emulating those found through an entrance between a temperature controlled lab and the model. Instruments such as a power meter, a flow explorer laser Doppler anemometer, and thermocouples were used to measure and compare the energy consumption, velocity vectors, and temperature energy within the entrance. Results indicate that the CCP did retain thermal energy compared to the CE. The CE developed sloped isotherm lines and air flow that enabled and maintained thermal exhaust. Conversely, the CCP developed horizontal isotherm lines and a two-layer density current to recirculate and retain thermal energy. The research demonstrates that it is possible to increase energy efficiency of entrances in many applications. Author Keywords: Air Recirculation, Building, Entrance, Oven, Thermal Energy Efficiency, Two-layer Density Current
On Forests, Witness Trees, and Bears
This dissertation is about Forests, their loss and the grieving that arises from their loss. The loss of ancient and old-growth forests by way of clearcutting and or anthropogenically driven disturbances, including climate change, presents the quandary of loss of both biological and cultural diversity. Following Umeek’s/E. Richard Atleo’s term, I suggest that “dis-ease” in the dominant relationship to forests in parts of the Western world significantly rests within inherited cultural and political pasts at play in the present, carried in much of the language and lifeways of modern Anglophone societies today. I do so by a critical topographical exploration of thematic patterns that go back to the Epic of Gilgamesh, the oldest written account of deforestation in the history of Western civilization. I offer at the center of my inquiry a collection of witness trees as North American case studies. Each tree is a witness object, a station from which I confront and explore social-ecological grief as it has accumulated over time from English colonization, with one focusing on Indigenous cultural reclamation and place-based ecological co-management. Lastly, I turn to a multispecies exploration of social-ecological grief, using bears in North America as a face for reflection and consider who and what more is lost when old forests are degraded and gone. By asking the place question—“what place is this?”—of forests, or the Forest Question, my dissertation is thus an exploration of the connection and responsibilities to other place-based human and other-than-human communities in a rapidly changing climate. Author Keywords: critical topography, environmental grief, forests, multispecies, social-ecological relations, witness trees

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Format: 2024/03/28