Year: 2026, 2026
Member of: Trent University Graduate Thesis Collection
Abstract: <p>The diversification of mammals has been shaped by climatic fluctuations and geological changes over millions of years. Among them, shrews (Soricidae) stand out as one of the most diverse mammalian lineages. Shrews are found on most continents and have evolved remarkable adaptations at the species and population levels. Although evolutionary studies of shrews have been limited by a lack… more Year: 2026, 2026
Member of: Trent University Graduate Thesis Collection
Abstract: <p>The ᐃᓕᓕᐗᔅᑭᔾ | Ililiwaskiy (Moose Cree First Nation Territory) in Ontario's James Bay region has long faced industrial impacts on its ecosystems. Community concerns about mercury in culturally important fish prompted an interdisciplinary study bringing together chemical analysis and community knowledge. Researchers partnered with Moose Cree members through workshops, training, and… more Year: 2026, 2026
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Diversified agroecosystems supporting greater genetic, structural, and functional diversity improve soil health and ecosystem function. However, there is limited understanding of how multiple forms of diversification, such as mixing cover crop species and adding arbuscular mycorrhizal fungi (AMF), alter belowground carbon supply to soil. In a controlled environment experiment using… more Year: 2026, 2026
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Kaszecki, Emma, Thesis advisor (ths): Saville, Barry J, Thesis advisor (ths): Emery, R. J. Neil, Degree committee member (dgc): Morrsion, Erin N, Degree committee member (dgc): Thompson, Karen A, Degree granting institution (dgg): Trent University Abstract: <p>Acid mine drainage (AMD) and metal-contaminated tailings represent some of the most inhospitable aquatic environments on Earth, characterized by low pH, elevated metal concentrations, and chronic carbon limitation. Yet these systems support microbial consortia with remarkable resilience. Among the most conspicuous inhabitants is Euglena mutabilis, an acidophilic protist traditionally… more Year: 2026, 2026
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Kim, William David, Thesis advisor (ths): Huber, Robert J, Degree committee member (dgc): Donaldson, Michael, Degree committee member (dgc): Shafer, Aaron, Degree committee member (dgc): Saville, Barry, Degree granting institution (dgg): Trent University Abstract: <p>The neuronal ceroid lipofuscinoses (NCLs), collectively referred to as Batten disease, are a group of neurodegenerative diseases that affect all ages, primarily children. Batten disease is caused by mutations in 1 of the 13 ceroid lipofuscinosis neuronal (CLN) genes (CLN1-CLN8, CLN10-CLN14), each of which causes an NCL subtype when mutated. One of the NCL subtypes, CLN5 disease, is… more Year: 2026, 2026
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Lopez Aleman, Jose Alberto, Thesis advisor (ths): Dorken, Marcel E, Thesis advisor (ths): Freeland, Joanna R, Degree committee member (dgc): Shafer, Aaron AB, Degree committee member (dgc): DiLeo, Michelle F, Degree granting institution (dgg): Trent University Abstract: <p>Hybridisation is an important evolutionary mechanism with diverse outcomes, including the formation of new lineages, the exchange of alleles between species, or their extinction through genetic swamping. In some cases, hybrids exhibit higher fitness than their parental species, which can lead to hybrid invasions that threaten ecosystems. In North America, hybridisation between the native… more Year: 2026, 2026
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Seneviratne, Dev, Thesis advisor (ths): Martic, Sanela, Thesis advisor (ths): Emery, Neil, Degree committee member (dgc): Oleschuk, Richard, Degree committee member (dgc): Moorthy, Arun, Degree committee member (dgc): Burr, Wesley, Degree granting institution (dgg): Trent University Abstract: <p>Amyloid fibrils are fibrous protein aggregates that arise from misfolding and self-assembly processes, collectively referred to as amyloidosis. These aggregates are strongly associated with incurable neurodegenerative disorders, including Alzheimer's disease (AD), Parkinson's disease, and Amyotrophic Lateral Sclerosis (ALS). Elevated levels of Reactive Oxygen Species (ROS) and… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Blanchard, Dane Alexander, Thesis advisor (ths): Aherne, Julian, Thesis advisor (ths): Gordon, Mark, Degree committee member (dgc): Aherne, Julian, Degree committee member (dgc): Gordon, Mark, Degree committee member (dgc): Dang, Huy, Degree committee member (dgc): Koprivnjak, Jean-François, Degree committee member (dgc): Mangal, Vaughn, Degree granting institution (dgg): Trent University Abstract: <p>Chromophoric dissolved organic matter (CDOM), a chemically diverse family of organic compounds defined by their ability to absorb ultraviolet and visible light, is a critical constituent of numerous environmental systems, including freshwater lakes. Industrial operations in the Athabasca Oil Sands Region (AOSR, Alberta, Canada) are major sources of acidic inorganic gases and organic… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Decades of sulphur and nitrogen deposition acidified forest ecosystems across northeastern North America causing declines in pH and exchangeable base cation concentrations, negatively affecting biota. To assist natural recovery, researchers are investigating using alkaline soil amendments such as wood ash. However, much remains unknown about its use. This thesis evaluated the effects of… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Diversity of flowers in flowering plants is understood to facilitate mating success, and yet understanding the relationships between plant sexual diversity and mating patterns remains a challenge. In this thesis, I used Sagittaria latifolia, an aquatic plant with unique sexual systems, to investigate relationships between plant sexual diversity, mating patterns, and reproductive success… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Lau, Vincent, Thesis advisor (ths): Tanentzap, Andrew, Degree committee member (dgc): Emilson, Erik, Degree committee member (dgc): Stock, Naomi, Degree committee member (dgc): Moorthy, Arun, Degree committee member (dgc): Braga, Lucas, Degree granting institution (dgg): Trent University Abstract: <p>Climate-driven permafrost thaw releases microorganisms and dissolved organic matter (DOM) into northern lakes, where their interactions with microbial communities and seasonal processes shape greenhouse gas emissions. In a factorial experiment mixing DOM and microbes from thermokarst ponds and lakes, we found that both DOM and microbial identity strongly influenced degradation. Lake… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>This work presents a new online method using gas chromatography coupled to the multicollector-inductively coupled plasma-mass spectrometer for methylmercury (MMHg) isotope ratio measurement. An extraction method using distillation was developed that effectively extracted MMHg from up to 5 grams of sediment, imparting no isotope fractionation on MMHg during extraction. Isotope ratios from… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Agriculture may result in soil disturbances, including contamination by rare earth elements (REE) and trace elements (TEs) from agricultural inputs (e.g. fertilizers, pesticides). Regulations concerning agricultural inputs currently do not consider TE background concentrations, concurrent use of inputs, and emerging contaminants. Therefore, they may not sufficiently protect against TE… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>This thesis presents a case of the aquatic plant species Fanwort (Cabomba caroliniana) significantly naturalizing in Kasshabog Lake in bays where it had been invasive. This significant naturalization presents major implications for invasive species management and invasion biology because the naturalization of invasive species is a phenomenon that has been largely omitted from study… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Brown, Taylor Marie, Thesis advisor (ths): Burness, Gary, Degree committee member (dgc): Davy, Christina, Degree committee member (dgc): Mastromonaco, Gabriela, Degree committee member (dgc): Wilhelm, Sabina, Degree granting institution (dgg): Trent University Abstract: <p>Globally, fledglings of more than 50 seabird species are vulnerable to stranding in human settlements near their colonies as they leave their nests for the first time. This phenomenon has been attributed to attraction toward and disorientation by artificial light at night (ALAN). Grassroots rescue programs find more birds in illuminated locations than in dark ones, but it is unclear to… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>The Lesser Yellowlegs (Tringa flavipes) is a steeply declining shorebird that breeds across boreal North America. I studied nest survival in Anchorage, Alaska, USA and Churchill, Manitoba, Canada and nest site selection factors in Churchill. Nests were monitored at each site and daily nest survival rates (DSR) were calculated based on a maximum likelihood approach. Overall nest survival… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Microplastics are intricate plastic particles (<5 mm in length) with complex chemical mixtures that are pervasive globally. Nonetheless, our understanding of microplastic contamination in the Canadian Arctic is limited. Therefore, this thesis aimed to investigate the concentration and characteristics of microplastics in and surrounding the community of Iqaluit, Nunavut. Our… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>In an effort to improve upon existing analytical methods, electrochemical sensors offer portable, cost-effective alternatives to traditional lab-based techniques. Recent advances in supramolecular chemistry offer a unique alternative to achieve high selectivity while also benefitting from facile scaling for mass production. Thus, by incorporating host-guest chemistry with electrochemical… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>DNA methylation (DNAm) is a useful indicator of phenotypic expression and diversity, and can potentially inform adaptations to environmental changes. This thesis uses epigenetic techniques to investigate the mechanisms underlying phenotypic variation in white-tailed deer, black bear, and mountain goat, with a particular focus on age and body size. In the second chapter, we aimed to… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Smith, Ewart Anthony, Thesis advisor (ths): Emery, Neil NE, Thesis advisor (ths): Narine, Suresh SN, Degree committee member (dgc): Martic, Sanela SM, Degree committee member (dgc): Kisiala, Anna AK, Degree granting institution (dgg): Trent University Abstract: <p>The study examines the phytochemical and phytohormone profiles of two ecotypes of Doliocarpus dentatus (Capadulla) from Guyana with an emphasis on their potential therapeutic applications, particularly in the context of erectile dysfunction. The research concentrates on the red and white ecotypes, which are visibly differentiated by the colouration of their inner and outer bark; moreover… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>DNAJC5, an HSP40 member, supports synaptic vesicle release and protein folding byactivating HSP70 ATPase activity. In humans, it localizes to presynaptic terminals and
endomembrane compartments that are involved in protein trafficking. Mutations in DNAJC5
cause CLN4 disease, a rare adult-onset Batten disease. Dictyostelium discoideum, a model for
neurodegenerative research, encodes a… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Prewer, Erin, Thesis advisor (ths): Kyle, Christopher J, Degree committee member (dgc): Donaldson, Michael, Degree committee member (dgc): Shafer, Aaron, Degree committee member (dgc): Saville, Barry, Degree granting institution (dgg): Trent University Abstract: <p>Molecular and genomic tools provide a deeper understanding of the ecology and evolution of species and their capacity to adapt to changing selective pressures, where diversity is presumedly linked to higher fitness and evolutionary potential. Molecular tools can also illustrate how historical processes affect contemporary genetic variation to predict how current population trends may… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Baecklund, Tristan Mackenzie, Thesis advisor (ths): Kyle, Christopher J, Degree committee member (dgc): Donaldson, Michael, Degree committee member (dgc): Shafer, Aaron, Degree committee member (dgc): Brown, Glen, Degree granting institution (dgg): Trent University Abstract: <p>Heterogeneous environments impose discordant selective pressures on natural populations, where disparate biotic/abiotic factors and variable population connectivity, yield mosaic patterns of genetic variation on the landscape. The ability to maintain or change genetic mosaics of populations becomes key to persistence, as species increasingly need to adapt to rapidly changing… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Bare, Evan, Thesis advisor (ths): Murray, Dennis, Thesis advisor (ths): Hossie, Thomas, Degree committee member (dgc): Bogart, Jim, Degree committee member (dgc): Wilson, Chris, Degree granting institution (dgg): Trent University Abstract: <p>Measuring biodiversity has become increasingly complex as biologists and ecologists have gradually learned more about how biotic systems are structured and interact. Given the wide range of tools, techniques and approaches now in use to quantify biological diversity, it is useful to consider different "dimensions of diversity" to classify these measurements and provide context… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Frog virus 3 (FV3) belongs to the genus Ranavirus within the Iridoviridae family.Its 105,903 base genome encodes 98 open reading frames (ORFs), including ORF 97R, a
putative apoptosis regulator sharing 31% structural similarity with the anti-apoptotic Bcl-
2 family protein, myeloid cell leukemia 1 (Mcl-1). 97R contains a BH1 domain,
implicated in apoptosis regulation, and a predicted C-… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Methylobacterium spp., a dominant and functionally conserved group of plant-associated bacteria, have long been recognized for their roles in promoting host growth, stress tolerance, and phytohormone modulation. This body of work collectively repositions Methylobacterium not only as a plant growth-promoting genus but also as a promising agent of microbiome-mediated crop protection.… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>A meta-analysis revealed that while there is often a greater degree of contamination of soils and sediments with metals, contamination by mercury (Hg) is a large concern owing to its toxicity at low concentrations. The case study in Guyana characterized Hg and concentrations of other metals (As, Cd, Co, Cu, Mn, Ni, Pb, and Zn) in soil and sediment within gold mined areas. Metal… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Bonnett, Sarah, Thesis advisor (ths): Nol, Erica, Thesis advisor (ths): Smith, Paul A, Degree committee member (dgc): Nol, Erica, Degree committee member (dgc): Smith, Paul A, Degree committee member (dgc): Brown, Glen, Degree granting institution (dgg): Trent University Abstract: <p>Climate change affects birds' reproductive ecology by altering breeding timing, distribution, and habitat suitability. Snowmelt patterns complicate these changes affecting habitat availability and suitability for birds and their arthropod prey. Snow varies as a function of both large-scale climate patterns and local-scale topography. I used elevational gradients as a proxy for local… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Innovative strategies to manage copious waste streams by upcycling feedstocks to valorized products which are then used in environmental remediation applications is an attractive circular economy model. This thesis explores this approach using waste wood generated from the milling of Chlorocardium rodiei (greenheart), a tropical hardwood species abundant in Guyana. We evaluate the… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Forests play a critical role in the global carbon cycle, acting as carbon sinks that remove and store an estimated 0.4 to 4.1 Pg of atmospheric carbon annually. However, historical acid deposition and timber harvesting have disrupted nutrient cycles, leading to nutrient-deficient soils that hinder tree growth, particularly for sugar maple (Acer saccharum), a keystone species in Ontario… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>The TATA-binding protein (TBP) is a key regulator of eukaryotic transcription initiation. The TBP homolog from Giardia intestinalis (gTBP) is highly divergent among all TBPs; notably lacking three of the four phenylalanine residues to unwind double- stranded DNA. I show that gTBP preferentially binds to single-stranded DNA (ssDNA) in two modes based on sequence and protein concentration… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Mutations in the CLN7 (MFSD8) gene, causes CLN7 disease, a subtype of neuronal ceroid lipofuscinosis. MFSD8 is a lysosomal transmembrane protein that transports chloride across membranes. Experimentation regarding Dictyostelium discoideum revealed that mfsd8 deficiency altered lysosomal enzyme activity. During starvation, the aggregation of mfsd8¬¬- cells was delayed, and cells formed… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Microsatellites and microhaplotypes are genetic markers that, through DNA amplicon sequencing, generate genotypes to distinguish between individuals from wildlife populations. Here, these markers were sequenced in caribou (Rangifer tarandus) specimens using Oxford Nanopore's MinION DNA sequencer for the first time. Microsatellite loci previously sequenced with an Illumina MiSeq were… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Trait variation in wild populations is shaped by the interaction of genetics and the environment. Given these interactions, this thesis explored trait variation in white-tailed deer from two angles: one focused on broad-scale environmental factors, the other on fine-scale genetic mechanisms. The first chapter investigated how climate and habitat variation influence antler size,… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Since the mid-Pleistocene, evolutionary histories of North American species were shaped by extreme climatic oscillations involving major range and habitat shifts at a rapid pace. The peopling of the continent and the subsequent human colonisation waves created further pressures affecting North American faunal and plant populations. Cervidae (deer family) are a diverse group which arrived… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Rare earth elements (REEs) are in high demand globally for the green transition and high technologies. The growing demand leads to their release into aquatic ecosystems from various point and non-point sources, which creates urgency to investigate their fate and enrichment. This thesis further investigates the biogeochemical fate and REE uptake mechanisms throughout aquatic ecosystems.… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Flavohemoglobins are enzymes primarily implicated in nitrosative stress due to their high nitric oxide (NO) dioxygenase activity and transcriptional upregulation in response to NO. Giardia intestinalis assemblages A, B, and E possess flavohemoglobins (gFlHb) that may function beyond their NO dioxygenase activity, potentially contributing to oxidative stress regulation, as transcriptional… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Increasing wildfire frequency, driven by climate change, can change the concentration andcomposition of dissolved organic matter (DOM) exported from land into receiving waters by
removing terrestrial vegetation, changing soil hydrology, and interrupting microbial degradation.
In this thesis, I tested how wildfire impacts the molecular composition and reactivity of DOM. I
compared DOM… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Understanding habitat needs of a species is critical, especially for species reintroduced to an area or expanding their range. I evaluated roost tree selection and survival probability of GPS-tagged eastern wild turkeys (Meleagris gallopavo silvestris) from 2017–2020 and 2022 in Peterborough County, Ontario, Canada. Fine-scale roost tree selection was associated with larger trees, with… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Andreas, Peter Frank, Thesis advisor (ths): Emery, R.J. N, Degree committee member (dgc): Beresford, David V, Degree committee member (dgc): Kisiala, Anna B, Degree committee member (dgc): Morrison, Erin N, Degree granting institution (dgg): Trent University Abstract: <p>Using Drosophila deficiency (Df) and Over Expression (OE) (GAL4/UAS>dCas9-VPR; sgRNA) gene systems, it was demonstrated that Dmel_CG31381 and Dmel_CG11089 are functional tRNA isopentenyltransferase (EC 2.5.1.8) genes (tRNA IPT1 and IPT2) critical to the first committed step in insect cytokinin biosynthesis. IPT Df mutants showed significant decreases in total CK levels and IPT1/… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Lowes, William Holden Hubert, Thesis advisor (ths): Brenner, Ingrid, Degree committee member (dgc): Woodend, Kirsten, Degree committee member (dgc): West, Sarah, Degree committee member (dgc): Moayedi, Yas, Degree granting institution (dgg): Trent University Abstract: <p>Heart failure (HF) is a condition with several possible etiologies that influence patient symptomatology, including response to exercise. The purpose of this review was to assess how cardiopulmonary exercise testing (CPET) parameters used for risk stratification differ and are associated with mortality and adverse cardiac events in patients with different HF etiologies. We completed a… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Migration, space use, and phenology play key roles in shaping avian populations and are therefore critical for conservation. My thesis examines the migration strategies and non-breeding spatial requirements of Virginia's beach-nesting American Oystercatchers (Haematopus palliatus), as well as the nesting phenology of mid-Atlantic American Oystercatchers and Piping Plovers (… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Crop losses due to pathogens, pests, and weeds account for 20–40% of global production, with fungal pathogens responsible for the most significant yield reductions and economic impact. The diseases caused by fungi spread through dormant spores, which protect its genetic material under adverse conditions. Dormancy is maintained until favorable germination conditions are met. Despite their… more Year: 2025, 2025
Member of: Trent University Graduate Thesis Collection
Abstract: <p>This thesis aimed to address potential sources of bias in electronic fish tagging studies in order to advance the methods used by future studies. I first provided a review and meta-analysis of intracoelomic tagging effects in fishes, summarizing the existing literature and assessing the extent to which previously identified research gaps have been filled. I also included the first large-… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Many communities in Canada rely on water sourced from boreal forest headwaters for their drinking water. The Boreal Shield Ecozone is highly susceptible to climate change which threatens to exacerbate the effects of natural and human-driven disturbances such as wildfire, insect infestation and harvesting on water quality. Therefore, examining source water quality in headwater catchments… more Full Text: The effects of forest disturbance on dissolved organic carbon in the Algoma region, central Ontario A Thesis Submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Master of Science in the Faculty of …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Penney, Chantelle, Thesis advisor (ths): Wilson, Chris C, Thesis advisor (ths): Burness, Gary, Degree committee member (dgc): Scott, Graham, Degree committee member (dgc): Craig, Paul, Degree committee member (dgc): Freeland, Joanna, Degree granting institution (dgg): Trent University Abstract: <p>Climate change is a major conservation concern, especially for many cold-adapted species. The rate of warming due to climate change will likely outpace adaptive responses, and many populations will likely need to rely on phenotypic plasticity to cope with environmental warming. It is currently unclear whether plasticity in physiological responses to warming will be sufficient to offset… more Full Text: WITHIN-GENERATION AND TRANSGENERATIONAL THERMAL PLASTICITY IN COLD-ADAPTED SALMONIDS OF THE GENUS SALVELINUS A Thesis Submitted to the Committee on Graduate Studies in Partial Fulfilment of the Requirements for the Degree of Doctor of Philosophy in the …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Acoustic communication is vital for mediating interactions between individuals and their environment. From echolocating bats to isolated rodent pups, ultrasonic vocalizations are a useful mechanism for producing localized and cryptic acoustic signals. Flying squirrels have been demonstrated to produce almost exclusively ultrasonic calls which is rare in both squirrels and mammals, though… more Full Text: The ecological, evolutionary, and behavioural context of ultrasonic vocalizations in flying squirrels A Thesis Submitted to the Committee on Graduate Studies in Partial Fulfilment of the Requirements for the Degree of Doctor of Philosophy in the Faculty …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>The Wabigoon River is known for an historic mercury (Hg) pollution source, caused by a chlor-alkali facility operating in the 1960s. As legacy Hg contamination continues to cause serious adverse health effects to the local communities living in the Wabigoon River region, it is imperative to undertake additional research to understand the deposition and transport of historical mercury in… more Full Text: Assessing Mercury and Methylmercury levels in the Wabigoon River with special aten�on on mercury methyla�on A Thesis Submited to the Commitee on Graduate Studies in Par�al Fulfilment of the Requirements for the Degree of Doctor of Philosophy in the Faculty …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Solmundson, Kirsten, Thesis advisor (ths): Wilson, Paul, Thesis advisor (ths): Bowman, Jeff, Degree committee member (dgc): Patterson, Brent, Degree committee member (dgc): Manseau, Micheline, Degree granting institution (dgg): Trent University Abstract: <p>Globally, wildlife populations are experiencing increasing rates of range loss, population decline, and extinction. Caribou (Rangifer tarandus) have experienced dramatic declines in both range and population size across Canada over the past century. Boreal caribou (R. t. caribou), one of twelve Designatable Units, have lost approximately half of their historic range in the last 150 years… more Full Text: CONSERVATION GENOMICS OF THE LAKE SUPERIOR CARIBOU A dissertation submitted to the Committee on Graduate Studies in partial fulfilment of the requirements for the degree of Doctor of Philosophy in the Faculty of Arts and Science TRENT UNIVERSITY …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>A key knowledge gap in aeolian transport research concerns the adjustment of saltation processes to the extreme conditions found within high-latitude regions. A series of wind tunnel experiments were carried out under full climate control and over a wide range in humidity. Particle entrainment and transport within shearing flows of varied wind speed were monitored over beds of varied… more Full Text: i INVESTIGATION OF DYNAMICS OF PARTICULATE TRANSPORT UNDER VARYING CLIMATE CONDITIONS A thesis submitted to the Committee of Graduate Studies in partial fulfillment of the requirements for the Degree of Master of Science in the Faculty of Arts and Science …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>In Ontario, farmers commonly use a MZ (Maize (Zea mays L.))-SB (Soybean (Glycine max))/WW (Winter wheat (Triticum aestivum)) – CC (mixed cover crop) rotation to maximize economic benefits. This study aimed to investigate the short-term impacts of the crop rotation phases and their associated management practices in this diversified cash crop rotation on soil health and the abundance of… more Full Text: SOIL HEALTH AND SOIL MICROBIAL RESPONSES TO CASH CROP MANAGEMENT IN ONTARIO A Thesis Submitted to the Committee on Graduate Studies In Partial Fulfillment of the Requirements for the Degree of Master of Science in the Faculty of Arts and Science TRENT …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Roy, Tyler, Thesis advisor (ths): Vreugdenhil, Andrew AV, Degree committee member (dgc): Parnis, Mark MP, Degree committee member (dgc): Shetranjiwalla-Merchant, Shegufta SM, Degree committee member (dgc): Rafferty, Steven SR, Degree granting institution (dgg): Trent University Abstract: <p> Naphthenic acids are a major contaminant of concern and a focus of much research around remediation of oil sand process affected waters, OSPW. Using activated carbon adsorbents are an attractive option given their low cost of fabrication and implementation. A deeper evaluation of the effect naphthenic acid structural differences have on uptake affinity is warranted. In this thesis an in… more Full Text: The Characterization of Model Naphthenic Acid Adsorption onto Activated Carbons: Effects of both Textural and Functional Properties A Thesis submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Doctor …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>The detection of ciguatoxins (CTXs) in biological samples is challenging due to their low concentrations, the presence of various congeners, and the absence of standardized methods. This study uses high resolution mass spectrometry (HRMS) with P-CTX-3B as a reference standard. The protonated molecules ([M+H]+) were most prevalent, especially when acetonitrile/water was utilized,… more Full Text: Advancements and Challenges in Ciguatoxin Detection: Developing a HighResolution Mass Spectrometric Method for the Identification of P-CTX-3B A Thesis Submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirements for the Degree …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Northern flying squirrels (NFS) are mycophagous specialists (fungi-dominated diet) thatmay be displaced with southern flying squirrel (SFS) range expansion, thereby limiting
fungal dispersal in forest communities. To understand the implications of squirrel
species turnover on mycophagy, we investigated the home ranges of both flying squirrel
species who are living in stable sympatry. We… more Full Text: Movement patterns, food availability, and fungal diets of sympatric flying squirrels in the Kawartha Highlands A Thesis Submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Master of Science in the …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>The Great Lakes represent nearly a fifth of the global freshwater surface supply, and support culturally, economically, and ecologically important fish species such as Walleye (Sander vitreus). With water temperatures projected to rise by several degrees in the coming century, understanding the energetic impacts on fishes is crucial for effective habitat and fisheries management. I… more Full Text: Calibration of accelerometer transmitters for estimating field metabolic rates in walleye (Sander vitreus) A Thesis Submitted to the Committee of Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Master of Science in the …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Long-term avian population declines, particularly for the avian insectivore guild, are a conservation concern. With widespread and continuing population trends, climate change and its negative effects on avian food resources is a plausible cross-species driver. My goal was to evaluate whether bottom-up trophic effects of climate change could be influencing avian populations. I used a… more Full Text: Bottom-up pathways for arthropods and forest breeding birds in a southern Ontario forest. A thesis submitted to the Committee on Graduate Studies in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Faculty of Arts and …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>The neuronal ceroid lipofuscinoses (NCLs), commonly known as Batten disease, are a family of fatal neurodegenerative disorders that primarily affect children. Several subtypes of NCLs have been reported, each being caused by a mutation in a distinct ceroid lipofuscinosis neuronal (CLN) gene; this results in aberrant lysosome function and the accumulation of lipoprotein aggregates (known… more Full Text: Insights from Dictyostelium: Examining the role of cellular stress in Batten disease A Thesis Submitted to the Committee of Graduate Studies in Partial Fulfillment of the Requirements for Degree of Master of Science in the Faculty of Arts and Science …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Taylor, Courtney Erin, Thesis advisor (ths): Dunlop, Erin S, Degree committee member (dgc): Lauzon, Ryan, Degree committee member (dgc): Raby, Graham, Degree committee member (dgc): Rennie, Michael, Degree granting institution (dgg): Trent University Abstract: <p>Lake Huron's food web has experienced drastic changes in response to multiple stressors including declines in offshore productivity, decreased trophic transfer efficiency and a transformation of the benthic food web. However, how these changes have affected the diets and isotopic niches of predatory fish is largely unexplored. My diet study analysed stomach contents from five… more Full Text: Regional diet and isotopic niche of predatory fish following a regime shift in Lake Huron A Thesis Submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Master of Science in the Faculty of Arts and …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Giardia intestinalis is the causative agent of a diarrheal disease in mammals, but the mechanisms of disease pathogenesis are unclear. While proteins secreted by Giardia affect the host cells, the potential of hormone secretion has not been investigated to date. Cytokinins (CKs) are classified as phytohormones, but little is known about their role beyond plants. Mass spectrometry-based… more Full Text: The effect of cytokinins on the metabolite secretome of Giardia intestinalis during trophozoite growth, nutrient deprivation, and encystation A thesis submitted to the Committee of Graduate Studies in partial fulfillment of the requirements for the degree …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Animal migration is defined as the seasonal movement from one independent and non-overlapping range to another. Understanding how and why animals migrate is important not only to understand their life history processes but also for informing other important ecological processes such as the spread of wildlife disease and habitat alteration. Animal migrations have been impacted by human… more Full Text: i Assessing the drivers of white-tailed deer (Odocoileus virginianus) migration: Exploring changing predation risk and food availability in an Ontario population A Thesis Submitted to the Committee on Graduate Studies in Partial Fulfillment of the …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Muskrat populations are declining across North America. In recent decades, hybrid cattail Typha x glauca has been invading wetlands in North America. This invasion is degrading wetland habitat, leading to reduced interspersion of water and vegetation. Muskrats are wetland-obligates and their populations are positively linked to marsh interspersion. Therefore, muskrat populations may be… more Full Text: Impacts of invasive hybrid cattail Typha x glauca and reduced marsh interspersion on muskrats (Ondatra zibethicus) in North America A thesis submitted to the Committee on Graduate Studies in partial fulfillment of the requirements for the degree of Master …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Fungi are a diverse group of organisms that play crucial roles in various ecological processes and have immense economic importance. Understanding the intricate mechanisms underlying fungal growth and development is fundamental to harnessing their potential and exploring their applications in different fields. Signalling molecules, such as hormones, have been identified as key regulators… more Full Text: The search for myco-hormones in the metabolome of the model organism Sordaria macrospora via LC-MS/MS. A Thesis Submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirement for the Degree of Master of Science In the Faculty of …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Animals are essential to freshwater biogeochemistry and productivity. Through their excretion, aquatic consumers release bioavailable nutrients and carbon that can vary with animal taxonomic rank, trophic position, and abiotic factors such as light and nutrient supply. In fresh waters, light and nutrient supply is often modulated by dissolved organic matter (DOM), a "murky"… more Full Text: Animal-mediated elemental cycling across time, space, and animal functional traits A Dissertation Submitted to the Committee of Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in the Faculty of Arts and …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Knight, Caitlyn, Thesis advisor (ths): Kapron, Carolyn, Degree committee member (dgc): Tobin, Stephanie, Degree committee member (dgc): Huber, Robert, Degree committee member (dgc): West, Sarah, Degree granting institution (dgg): Trent University Abstract: <p>Cadmium is a toxic metal that has detrimental effects on blood vessel development and function. To examine the effect of varying concentrations of cadmium on angiogenesis, two in vitro assays were used. First, developing yolk sac blood vessels were studied in gestation day 8 mouse embryos exposed to medium alone, 1.25, or 1.75 μM cadmium chloride (CdCl2). Embryos exposed to 1.25 μM… more Full Text: Concentration-Dependent Effects of Cadmium on Mouse Angiogenesis In Vitro A Thesis Submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Science in the Faculty of Arts and Science TRENT UNIVERSITY …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Phosphorus is the growth-limiting nutrient in freshwater environments. Dissolved organic phosphorus (DOP) refers to phosphorus within dissolved organic matter (DOM). Much of DOP is bioavailable, but it is poorly understood due to its complexity. This thesis explores the export DOP to Lake Erie from its tributaries, by investigating its speciation and concentration seasonally through… more Full Text: DISSOLVED ORGANIC PHOSPHORUS AND DISSOLVED ORGANIC MATTER IN LAKE ERIE AND ITS TRIBUTARIES A Thesis Submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Master of Science in the Faculty of Arts and …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Wetlands are highly susceptible to the invasion of invasive species. The invasive hybrid cattail (Typha × glauca) is prevalent in the southeastern Prairie Pothole Region (PPR) wetlands. However, concerns arise about its recent proliferation in the northwestern PPR without maternal T. angustifolia. To determine taxonomic distribution, I used species-specific PCR-RFLP and microsatellite… more Full Text: Range Expansion of Invasive Hybrid Cattails (Typha × Glauca) in the Prairie Pothole Region A Thesis submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Master of Science in the Faculty of Arts and …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>I investigated the climate vulnerability of a cold-water salmonid by observing the upper thermal tolerance of brook trout (Salvelinus fontinalis) across multiple life stages. Using hatchery- and wild-ancestry fish, I assessed variation in thermal tolerances and carryover effects within and among brook trout life stages and populations that were reared under varying winter thermal regimes… more Full Text: Impacts of embryo incubation temperature on ontogenic thermal tolerance of brook trout (Salvelinus fontinalis) A Thesis submitted to the Committee on Graduate Studies In Partial Fulfillment of the Requirements for the Degree of Master of Science in the …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>ABSTRACT</p><p>Development of Forest Degradation Indicators from Long-term Trajectories of Multispectral Satellite Images, and their Projections into the Future
under Climate Change, in Ontario, Canada</p><p>Md. Mozammel Hoque</p><p>Ontario forests are affected by natural and anthropogenic disturbances leading to forest degradation, which significantly… more Full Text: Development of Forest Degradation Indicators from Long-term Trajectories of Multispectral Satellite Images, and their Projections into the Future under Climate Change, in Ontario, Canada A Dissertation Submitted to the Committee on Graduate Studies in …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Giardia intestinalis is a parasitic protozoan that possesses a flavohemoglobin (gFlHb), an enzyme that plays a role in the detoxification of reactive nitrogen species (RNS) and reactive oxygen species (ROS) via its nitric oxide dioxygenase (NOD) activity as well as its NADH-oxidase activity. This enzyme is a potential target for imidazole-based antigiardial drugs that act as ligands of… more Full Text: Rapid Assays to Test for Flavohemoglobin Inhibitors A thesis submitted to the Committee of Graduate Studies in partial fulfillment of the requirements for the degree of Master of Science in the Faculty of Arts and Science Trent University Peterborough, …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Eutrophication is an ongoing global problem and agriculture is an important non-point source of nutrient loading. Specifically, nitrogen (N) and phosphorus (P) losses from agricultural landscapes continue to drive water quality issues. In southern Ontario, agriculture has intensified in recent decades, with major expansions of cash crop production and extensive tile drainage (TD).… more Full Text: Effects of tile drainage, seasonality, and cash crop rotation on edge-of-field nitrogen and phosphorus losses from southern Ontario Watersheds A thesis submitted to the Committee on Graduate Studies In partial fulfillment of these thesis requirements for …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Population cycles are characterized by predictable temporal oscillations in population size and are influenced by densities of both predators and prey. These oscillations are influenced by the predator functional response, i.e. the influence of prey density on predator kill rate. The Canada lynx (Lynx canadensis) is a predatory mammal with cyclic northern populations driven by snowshoe… more Full Text: Behavioural responses of Canada lynx (Lynx canadensis) to cyclic declines in the snowshoe hare (Lepus americanus) A Dissertation Submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Doctor of …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>We studied the physiological and molecular responses of lab-grown Daphnia pulex to shifts in dietary (carbon, nitrogen, phosphorus, and cyanobacteria) and growth media (calcium) nutrient supply using a set of potential biomarkers via qPCR. Each examined nutrient had a strong effect on Daphnia mass-specific growth rate, and we found significant dose-dependent effects of treatment level (… more Full Text: GENES RESPOND IN A DOSE-DEPENDENT MANNER TO NUTRITIONAL STRESS IN THE FRESHWATER ZOOPLANKTER, DAPHNIA PULEX A Thesis Submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Master of Science in the …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Due to climate change and managed care, birds may face interacting effects of novel diets and environmental temperatures. I examined how captive zebra finches (Taeniopygia guttata) responded to a 6-month acclimation to either thermoneutral or cool temperatures when provided with saturated or unsaturated fatty acid enriched diets. Body mass was lower on the unsaturated fatty acid diet,… more Full Text: DIETARY FATTY ACID CONTENT CHANGES THE LONG-TERM ACCLIMATION RESPONSE OF A CAPTIVE BIRD (TAENIOPYGIA GUTTATA) TO AMBIENT TEMPERATURES A Thesis Submitted to the Committee on Graduate Studies In Partial Fulfillment of the Requirements for the Degree of …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Agricultural and urban land uses have been linked to the recent resurgence of eutrophication and salinization issues in the lower Great Lakes. This thesis examined the relationship between watershed land use and stream nitrate-nitrogen (NO3-N), total phosphorus (TP), and chloride (Cl) concentrations across southern Ontario. Using a self-organizing map analysis, the watersheds were… more Full Text: EVALUATING THE RELATIONSHIPS BETWEEN LAND USE AND STREAM NUTRIENT AND CHLORIDE CONCENTRATIONS ACROSS SOUTHERN ONTARIO A thesis submitted to the Committee of Graduate Studies in partial fulfilment of the requirements for the Degree of Master of Science in …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Recovery of forest soils from chronic acidification can be enhanced with the use of non-industrial wood ash (NIWA). Non-industrial wood ash is alkaline and contains high concentrations of macronutrients, but trace metal concentrations must be evaluated to limit risk of metal toxicity following application. Additionally, understanding how different forest ecosystem components respond to… more Full Text: Biogeochemical Responses to a Non-Industrial Wood Ash Addition in a SouthCentral Ontario Forest A thesis submitted to the Committee of Graduate Studies in partial fulfillment of the requirements for the degree of Master of Science in the Faculty of Arts …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>I used 31 years of Semipalmated Plover (Charadrius semipalmatus) population data to assess the effects of vital rates on a local breeding population of plovers in Churchill, Manitoba, Canada. I used three similar Bayesian Integrated Population Models (IPMs), with the last a coupled IPM population viability analysis (PVA) approach to predict the impact of changing spring temperatures on… more Full Text: Thirty Years of Local Semipalmated Plover (Charadrius semipalmatus) Population Dynamics in Churchill, Manitoba, Canada: A Long-Term Study on Factors Influencing the Rate of Population Change Over Time A Thesis submitted to the Committee on Graduate …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Quantifying the impacts of environmental conditions on the abundance of wildlife populations is important for making informed management decisions in the face of increasing environmental threats. Managers require robust tools to estimate abundance and density of wildlife rapidly and with precision. Within the context of studying white-tailed deer, I evaluated the use of camera-traps and… more Full Text: Remote Camera-traps as a Management Tool: Estimating Abundance and Landscape Effects on the Density of White-tailed Deer A Thesis Submitted to the Committee of Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Master of Science …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Hybridization contributes to the genetic diversity and can impact speciation. This study investigates the genetic evidence of recent hybridization under climate change in sympatric populations of northern and southern flying squirrels in Ontario. Using low-coverage whole-genome sequences, my research examines the existing population structure and measures the genomic variation of the… more Full Text: 1 2 3 GENOMIC SIGNATURES OF SPECIATION IN SYMPATRIC FLYING SQUIRRELS 4 5 6 7 8 9 A Thesis Submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Master of Science in the Faculty of Arts and Science 10 …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Bonar, Maegwin, Thesis advisor (ths): Northrup, Joseph M, Thesis advisor (ths): Shafer, Aaron BA, Degree committee member (dgc): Koen, Erin, Degree committee member (dgc): Schaefer, James, Degree granting institution (dgg): Trent University Abstract: <p>Animal migrations are ubiquitous and one of the most threatened ecological processes globally. Because of the multifaceted nature of migration – seasonal movements between home ranges – it can be difficult to tease apart the underlying mechanisms influencing this behaviour. It is necessary to understand these mechanisms, not only to deepen our fundamental understanding of migration in… more Full Text: The ecology and evolution of animal migration – an integrative approach to the drivers of phenotypic variation A dissertation submitted to the Committee on Graduate Studies in partial fulfillment of the requirements for the degree of Doctor of Philosophy …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Blondin, Anne, Thesis advisor (ths): Nol, Erica, Degree committee member (dgc): Drever, Mark, Degree committee member (dgc): Flemming, Scott, Degree committee member (dgc): Burness, Gary, Degree granting institution (dgg): Trent University Abstract: <p>Many species of shorebirds depend on stopover sites to rest and refuel during their long-distance migrations. To determine how shorebirds use migratory stopover sites, we tracked three species of shorebirds at two stopover sites in British Columbia, Canada from 2018-2021 during northward and southward migration using automated telemetry. Western Sandpipers (Calidris mauri) stayed longer… more Full Text: Length of stay and habitat use of shorebirds at two migratory stopover sites in British Columbia, Canada A thesis submitted to the Committee on Graduate Studies in partial fulfillment of the requirements for the degree of Master of Science in the Faculty …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>This study examines the atmospheric (synoptic) controls on snowmelt and snow-free season carbon dioxide (CO2) fluxes at Daring Lake, Northwest Territories. Atmospheric circulation patterns were derived from 500 hPa geopotential height and classified using the self-organizing maps artificial neural network. Snowmelt timing was not found to be influenced by atmospheric circulation patterns… more Full Text: THE INFLUENCE OF ATMOSPHERIC CIRCULATION ON SNOWMELT AND CARBON FLUXES IN THE CANADIAN LOW ARCTIC A Thesis Submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Master of Science in the Faculty of Arts …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Dissolved organic matter (DOM) plays a vital role in lake ecosystems, yet its temporal and spatial variations in lakes remain poorly understood. This study investigates DOM dynamics in boreal lakes during the warm season and the Laurentian Great Lakes ice during winter. Sampling 10 boreal lakes in early and late June 2022, revealed subtle changes in DOM in the epilimnion and hypolimnion… more Full Text: Spatiotemporal patterns of dissolved organic matter in Boreal Shield lakes and ice of the Laurentian Great Lakes A Thesis submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirement for the Degree of Master of Science in the …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Glyphosate burndown and tillage, followed by the cultivation of cash crops, are frequently used techniques in LUC from perennial cropping systems (PS) to annual cropping systems (AS). Agricultural LUC can result in the loss of soil nitrogen (N) via emission of nitrous oxide (N2O), a potent greenhouse gas (GHG). The purpose of this thesis is to investigate the short-term impacts of… more Full Text: SHORT-TERM IMPACTS OF AGRICULTURAL LAND USE CHANGE ON SOIL HEALTH AND NITROGEN CYCLING MICROBIAL COMMUNITIES A Thesis Submitted to the Committee on Graduate Studies In Partial Fulfillment of the Requirements for the Degree of Master of Science in the …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Advanced generation/backcrossed (non-F1) hybrids can be challenging to identify when their traits are similar to those of parental taxa, F1 hybrids, or both. This is particularly evident in the North American hybrid zone involving Typha latifolia, T. angustifolia, F1 T. × glauca and non-F1 hybrids. Cattails are challenging to differentiate based on gross morphological characteristics.… more Full Text: Accuracy and reliability of microscopic characteristics to identify Typha species and their hybrids A thesis submitted to the Committee on Graduate Studies in partial fulfilment of the requirements for the degree of Master of Science in the Faculty of …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Although stormwater management ponds (SWMPs) are frequently used to mitigate flooding in urban areas, we still do not fully understand how these systems impact water quality in a watershed. Currently, most research focuses on the effectiveness of SWMPs to retain nutrients during high flows, even though there is potential for internal nutrient releases to occur in these systems during low… more Full Text: NUTRIENT DYNAMICS AND STOICHIOMETRY IN STORMWATER MANAGEMENT PONDS A Dissertation Submitted to the Committee on Graduate Studies in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy in the Faculty of Arts and Science. TRENT …
Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Blondin, Anne, Thesis advisor (ths): Nol, Erica, Degree committee member (dgc): Drever, Mark, Degree committee member (dgc): Flemming, Scott, Degree committee member (dgc): Burness, Gary, Degree granting institution (dgg): Trent University Abstract: <p>Many species of shorebirds depend on stopover sites to rest and refuel during their long-distance migrations. To determine how shorebirds use migratory stopover sites, we tracked three species of shorebirds at two stopover sites in British Columbia, Canada from 2018-2021 during northward and southward migration using automated telemetry. Western Sandpipers (Calidris mauri) stayed longer… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Advanced generation/backcrossed (non-F1) hybrids can be challenging to identify when their traits are similar to those of parental taxa, F1 hybrids, or both. This is particularly evident in the North American hybrid zone involving Typha latifolia, T. angustifolia, F1 T. × glauca and non-F1 hybrids. Cattails are challenging to differentiate based on gross morphological characteristics.… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Glyphosate burndown and tillage, followed by the cultivation of cash crops, are frequently used techniques in LUC from perennial cropping systems (PS) to annual cropping systems (AS). Agricultural LUC can result in the loss of soil nitrogen (N) via emission of nitrous oxide (N2O), a potent greenhouse gas (GHG). The purpose of this thesis is to investigate the short-term impacts of… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Although stormwater management ponds (SWMPs) are frequently used to mitigate flooding in urban areas, we still do not fully understand how these systems impact water quality in a watershed. Currently, most research focuses on the effectiveness of SWMPs to retain nutrients during high flows, even though there is potential for internal nutrient releases to occur in these systems during low… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>I investigated the climate vulnerability of a cold-water salmonid by observing the upper thermal tolerance of brook trout (Salvelinus fontinalis) across multiple life stages. Using hatchery- and wild-ancestry fish, I assessed variation in thermal tolerances and carryover effects within and among brook trout life stages and populations that were reared under varying winter thermal regimes… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Many communities in Canada rely on water sourced from boreal forest headwaters for their drinking water. The Boreal Shield Ecozone is highly susceptible to climate change which threatens to exacerbate the effects of natural and human-driven disturbances such as wildfire, insect infestation and harvesting on water quality. Therefore, examining source water quality in headwater catchments… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Long-term avian population declines, particularly for the avian insectivore guild, are a conservation concern. With widespread and continuing population trends, climate change and its negative effects on avian food resources is a plausible cross-species driver. My goal was to evaluate whether bottom-up trophic effects of climate change could be influencing avian populations. I used a… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Quantifying the impacts of environmental conditions on the abundance of wildlife populations is important for making informed management decisions in the face of increasing environmental threats. Managers require robust tools to estimate abundance and density of wildlife rapidly and with precision. Within the context of studying white-tailed deer, I evaluated the use of camera-traps and… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>I used 31 years of Semipalmated Plover (Charadrius semipalmatus) population data to assess the effects of vital rates on a local breeding population of plovers in Churchill, Manitoba, Canada. I used three similar Bayesian Integrated Population Models (IPMs), with the last a coupled IPM population viability analysis (PVA) approach to predict the impact of changing spring temperatures on… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Eutrophication is an ongoing global problem and agriculture is an important non-point source of nutrient loading. Specifically, nitrogen (N) and phosphorus (P) losses from agricultural landscapes continue to drive water quality issues. In southern Ontario, agriculture has intensified in recent decades, with major expansions of cash crop production and extensive tile drainage (TD).… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Muskrat populations are declining across North America. In recent decades, hybrid cattail Typha x glauca has been invading wetlands in North America. This invasion is degrading wetland habitat, leading to reduced interspersion of water and vegetation. Muskrats are wetland-obligates and their populations are positively linked to marsh interspersion. Therefore, muskrat populations may be… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Hybridization contributes to the genetic diversity and can impact speciation. This study investigates the genetic evidence of recent hybridization under climate change in sympatric populations of northern and southern flying squirrels in Ontario. Using low-coverage whole-genome sequences, my research examines the existing population structure and measures the genomic variation of the… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Wetlands are highly susceptible to the invasion of invasive species. The invasive hybrid cattail (Typha × glauca) is prevalent in the southeastern Prairie Pothole Region (PPR) wetlands. However, concerns arise about its recent proliferation in the northwestern PPR without maternal T. angustifolia. To determine taxonomic distribution, I used species-specific PCR-RFLP and microsatellite… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>In Ontario, farmers commonly use a MZ (Maize (Zea mays L.))-SB (Soybean (Glycine max))/WW (Winter wheat (Triticum aestivum)) – CC (mixed cover crop) rotation to maximize economic benefits. This study aimed to investigate the short-term impacts of the crop rotation phases and their associated management practices in this diversified cash crop rotation on soil health and the abundance of… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Roy, Tyler, Thesis advisor (ths): Vreugdenhil, Andrew AV, Degree committee member (dgc): Parnis, Mark MP, Degree committee member (dgc): Shetranjiwalla-Merchant, Shegufta SM, Degree committee member (dgc): Rafferty, Steven SR, Degree granting institution (dgg): Trent University Abstract: <p> Naphthenic acids are a major contaminant of concern and a focus of much research around remediation of oil sand process affected waters, OSPW. Using activated carbon adsorbents are an attractive option given their low cost of fabrication and implementation. A deeper evaluation of the effect naphthenic acid structural differences have on uptake affinity is warranted. In this thesis an in… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>The detection of ciguatoxins (CTXs) in biological samples is challenging due to their low concentrations, the presence of various congeners, and the absence of standardized methods. This study uses high resolution mass spectrometry (HRMS) with P-CTX-3B as a reference standard. The protonated molecules ([M+H]+) were most prevalent, especially when acetonitrile/water was utilized,… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>The Great Lakes represent nearly a fifth of the global freshwater surface supply, and support culturally, economically, and ecologically important fish species such as Walleye (Sander vitreus). With water temperatures projected to rise by several degrees in the coming century, understanding the energetic impacts on fishes is crucial for effective habitat and fisheries management. I… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Recovery of forest soils from chronic acidification can be enhanced with the use of non-industrial wood ash (NIWA). Non-industrial wood ash is alkaline and contains high concentrations of macronutrients, but trace metal concentrations must be evaluated to limit risk of metal toxicity following application. Additionally, understanding how different forest ecosystem components respond to… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Acoustic communication is vital for mediating interactions between individuals and their environment. From echolocating bats to isolated rodent pups, ultrasonic vocalizations are a useful mechanism for producing localized and cryptic acoustic signals. Flying squirrels have been demonstrated to produce almost exclusively ultrasonic calls which is rare in both squirrels and mammals, though… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Solmundson, Kirsten, Thesis advisor (ths): Wilson, Paul, Thesis advisor (ths): Bowman, Jeff, Degree committee member (dgc): Patterson, Brent, Degree committee member (dgc): Manseau, Micheline, Degree granting institution (dgg): Trent University Abstract: <p>Globally, wildlife populations are experiencing increasing rates of range loss, population decline, and extinction. Caribou (Rangifer tarandus) have experienced dramatic declines in both range and population size across Canada over the past century. Boreal caribou (R. t. caribou), one of twelve Designatable Units, have lost approximately half of their historic range in the last 150 years… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Giardia intestinalis is a parasitic protozoan that possesses a flavohemoglobin (gFlHb), an enzyme that plays a role in the detoxification of reactive nitrogen species (RNS) and reactive oxygen species (ROS) via its nitric oxide dioxygenase (NOD) activity as well as its NADH-oxidase activity. This enzyme is a potential target for imidazole-based antigiardial drugs that act as ligands of… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Penney, Chantelle, Thesis advisor (ths): Wilson, Chris C, Thesis advisor (ths): Burness, Gary, Degree committee member (dgc): Scott, Graham, Degree committee member (dgc): Craig, Paul, Degree committee member (dgc): Freeland, Joanna, Degree granting institution (dgg): Trent University Abstract: <p>Climate change is a major conservation concern, especially for many cold-adapted species. The rate of warming due to climate change will likely outpace adaptive responses, and many populations will likely need to rely on phenotypic plasticity to cope with environmental warming. It is currently unclear whether plasticity in physiological responses to warming will be sufficient to offset… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Estimation of population abundance from samples has inherent practical challenges. Moreover, analytical methods to estimate abundance may vary in statistical assumptions and prediction uncertainties. I evaluated the performance of design-based and model-based methods to estimate Canada geese (Branta canadensis) abundance based on aerial fixed-width transect surveys in the Hudson Bay… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Northern flying squirrels (NFS) are mycophagous specialists (fungi-dominated diet) thatmay be displaced with southern flying squirrel (SFS) range expansion, thereby limiting
fungal dispersal in forest communities. To understand the implications of squirrel
species turnover on mycophagy, we investigated the home ranges of both flying squirrel
species who are living in stable sympatry. We… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Cytokinins (CKs) are adenine derivative molecules that are present in all kingdoms of life. CKs are known to have a role in cell growth and development in plants. However, the role of CKs in vertebrate systems is not well understood. Frog virus 3 (FV3) is a type species of the Iridioviridae family, genus Ranavirus. FV3 is a major contributor to the amphibian population decline in North… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Wildlife translocation programs are widely employed as a strategy to reintroduce extirpated species into regions they once inhabited but no longer do. Reintroduction programs can be successful at re-establishing extirpated populations and also provide unique opportunities to study post-reintroduction population dynamics and behavioural ecology. The wild turkey (Meleagris gallopavo) is a… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>The Wabigoon River is known for an historic mercury (Hg) pollution source, caused by a chlor-alkali facility operating in the 1960s. As legacy Hg contamination continues to cause serious adverse health effects to the local communities living in the Wabigoon River region, it is imperative to undertake additional research to understand the deposition and transport of historical mercury in… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Name(s): Creator (cre): Bonar, Maegwin, Thesis advisor (ths): Northrup, Joseph M, Thesis advisor (ths): Shafer, Aaron BA, Degree committee member (dgc): Koen, Erin, Degree committee member (dgc): Schaefer, James, Degree granting institution (dgg): Trent University Abstract: <p>Animal migrations are ubiquitous and one of the most threatened ecological processes globally. Because of the multifaceted nature of migration – seasonal movements between home ranges – it can be difficult to tease apart the underlying mechanisms influencing this behaviour. It is necessary to understand these mechanisms, not only to deepen our fundamental understanding of migration in… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>This study examines the atmospheric (synoptic) controls on snowmelt and snow-free season carbon dioxide (CO2) fluxes at Daring Lake, Northwest Territories. Atmospheric circulation patterns were derived from 500 hPa geopotential height and classified using the self-organizing maps artificial neural network. Snowmelt timing was not found to be influenced by atmospheric circulation patterns… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>ABSTRACT</p><p>Development of Forest Degradation Indicators from Long-term Trajectories of Multispectral Satellite Images, and their Projections into the Future
under Climate Change, in Ontario, Canada</p><p>Md. Mozammel Hoque</p><p>Ontario forests are affected by natural and anthropogenic disturbances leading to forest degradation, which significantly… more Year: 2024, 2024
Member of: Trent University Graduate Thesis Collection
Abstract: <p>Arctic breeding shorebirds are often considered alternate or secondary prey to avian and terrestrial predators that primarily feed on cyclic populations of rodents. Predation risk can strongly influence habitat selection; however, there is limited understanding of how nest placement by shorebirds and subsequent risk of nest predation are affected by spatiotemporal patterns involving the… more
