Theses (Geography)
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Item Optimization of C- and L-band synthetic aperture radar for all-season rift detection: A case study of the Larsen C Ice Shelf(2025) McDougall, Kali Ann; Scharien, RandallMore than half of ice mass loss from Antarctica occurs through calving of large tabular icebergs along rifts at the outer margins of ice shelves, which can lead to ice shelf destabilization and collapse. Synthetic aperture radar (SAR) sensors provide the greatest potential utility for the study of calving-related mechanisms by offering year-round, all-weather imaging and penetration of surface snow. To fully utilize SAR for rift detection, the constraints on fracture detectability posed by surface melt, and radar frequency and polarization, must be characterized. We examined dual-pol (HH and HV) Sentinel-1 C-band frequency (5.4 GHz) and PALSAR-2/SAOCOM L-band frequency (1.2 GHz) SAR images of the Gipps Ice Rise rift system on the Larsen C Ice Shelf during the 2020-2021 melt year. Rift geometry was characterized using the ATL06 land ice height product from ICESat-2, and surface melt was identified using a fixed threshold applied to Advanced Scatterometer (ASCAT) imagery. A Kolmogorov-Smirnov test was performed on ice type classes to determine their spectral separability in SAR images throughout the melt year. To further evaluate the performance of different SAR configurations on rift detection, pixel-based and image object-based Random Forest classifications were tested during late winter and late melt conditions. Overall, rifts that are filled with mĆ©lange are difficult to discriminate from the surrounding firn across seasons. Greater consistency in rift detection is found using L-band frequency compared to C-band, with enhanced L-band capability in winter in the presence of a thick ice mĆ©lange layer. In general, HV polarization provides greater separability between ice types compared to HH polarization and improves the detection of rifts through most of the melt year, apart from the late melt stage. Lastly, an object-based approach is superior to a pixel-based approach for the application of machine learning to automate rift detection using SAR. Optimizing the full potential of C- and L-band SAR for rift detection, and the development of an object-based machine learning detection method, will lay the groundwork for future automated rift detection and calving studies. Here a bottom-up assessment of SAR-based rift detection is presented, which provides a useful foundation for future algorithm development and the implementation of a standardized rift detection method.Item Detection of coccolithophore bloom development in the Salish Sea, Canada: Leveraging reflectance data from autonomous shipborne in situ radiometers and Sentinel-3A with a random forest classifier(2025) Wang, Ziwei; Costa, MayciraPhytoplankton are the primary producers in the ocean, forming the base of the marine food web. Among them, coccolithophores hold particular significance due to their ability to form extensive blooms and their unique role in oceanic calcium and carbonate cycling, as well as related biogeochemical processes. Current limitations in using satellite imagery to derive accurate phytoplankton data, such as chlorophyll concentrations and phytoplankton functional types stem from insufficient in situ reflectance measurements to develop models and validate satellite reflectance. To address this, we deployed a suite of hyperspectral radiometers equipped with autonomous solar tracking capability, collectively known as SAS Solar Tracker (Satlantic Inc./Sea-Bird, denoted as SAS-ST hereafter), atop a commercial ferry traversing the Salish Sea, Canada. We specified the optimal geometry for SAS-ST installation, as well as the identification and flagging of unfavourable meteorological conditions, correction for sun glint and skylight contributions, mitigation of structural interferences, and subsequent application of bidirectional reflectance distribution function (BRDF) corrections to ensure optimal data quality. Assessment of the final data quality was conducted using a quality assurance method that considers spectral shape similarity, revealing that approximately 92% of the acquired reflectance data aligned well with the global database, indicating high quality. During the data collection period of this research in the summer of 2016, an unprecedented coccolithophore bloom occurred in the Salish Sea area. Coccolithophores, a distinctive phytoplankton species, are encased in calcium carbonate plates called coccoliths, which can be shed into the water during later stages of the blooms, significantly augmenting water reflectance. Based on its unique spectral features, our research successfully identified the presence of the coccolithophore bloom and further categorized the bloom spectra into growing and decaying stages. The hyperspectral reflectance SAS-ST data were initially convolved to the Sentinel-3A OLCI 10 spectral bands spanning 400 to 709 nm. Comparison of Sentinel-3A OLCI satellite spectra with SAS-ST in situ data revealed that reflectance acquired by the OLCI satellite was underestimated, particularly in the 400-443 nm range and the decaying bloom category. Consequently, we developed an adapted machine learning algorithm based on wavelengths ranging from 490 nm to 709 nm, which increased the overall prediction accuracy for OLCI-measured coccolithophore spectra from 0.794 to 0.891, and enhanced the Kappa coefficient from 0.14 to 0.60. By leveraging data from autonomous shipborne In situ SAS-ST and Sentinel-3A OLCI, my research overcomes current limitations of coccolithophore detection algorithms in coastal waters impacted by river plumes, while also providing new insights into coccolithophore dynamics and potentially enhancing their remote sensing.Item Virtual reality (VR) storytelling: Building awareness and reducing stigma towards waste pickers(2025) Ebrahimi, Bita; Gutberlet, Jutta; Baniasadi, AmiraliThis thesis explores the potential of Virtual Reality (VR) storytelling as an innovative tool to challenge dominant narratives, build critical awareness, reduce stigma, and foster empathy towards marginalized and stigmatized communities. Grounded on decolonial and critical frameworks, and drawing on Paulo Freireās problem-posing education and conscientization, the study investigates how Virtual Reality (VR) storytelling can bridge the gap between abstract understanding and emotional engagement, supporting social inclusion and knowledge democracy. This research chose to work with waste pickersā community, who often experience marginalization, exclusion from policy decisions, and societal devaluation, despite their significant contributions to environmental sustainability. Through a participatory collaboration, with a waste pickersā community in SĆ£o Paulo, Brazil, the research integrates Virtual Reality (VR) Storytelling with Community-Based Research (CBR). Following official coordination and respective ethical procedures, visual data are collected, including 360-degree video footage capturing the work environment of the waste pickers and their personal narratives. This combination of qualitative data (interviews and visual documentation) forms the core of the primary data integrated into a VR simulation. The VR simulation created for this project allows users to experience the actual workplace of waste pickers and listen to their stories narrated by the waste pickers themselves in an intimate setting as if they were truly present in that environment. The final simulation has been showcased in three different venues in Canada. Impressively, audience feedback, both verbal and written, highlights that the developed method has a strong potential to contribute to critical education of people, by challenging preconceived notions, enhancing public awareness and fostering empathy among the participants. Finally, based on the integration of VR storytelling with community engagement, this thesis argues that immersive storytelling would help us go beyond traditional learning processes and serve as a powerful medium for mobilizing knowledge, building critical awareness, ultimately fostering a more equitable and inclusive society.Item Exploring food waste in universities: A case study of the University of Victoria and the Jaramogi Oginga Odinga University of Science and Technology(2025) Wuntah, John; Gutberlet, JuttaThis thesis explores the socio-cultural and systemic drivers of food waste among university students at the University of Victoria (UVic) in Canada and Jaramogi Oginga Odinga University of Science and Technology (JOOUST) in Kenya. Drawing on Social Practice Theory (SPT) and Political Ecology (PE) theoretical frameworks, the research investigates how cultural norms, institutional policies, and infrastructural factors contribute to food waste in these academic environments. Using a combination of focus groups, photo narratives, and semi-structured interviews with students, faculty, and food service personnel, the findings reveal that food waste is shaped by large portion sizes, dissatisfaction with taste, limited storage options, and social and cultural norms. At UVic, the rigid meal plan system promotes over-serving, while JOOUSTās pay-as-you-eat system, though seemingly fairer, carries the risk of over-purchasing, influenced by communal dining practices. The study emphasizes that addressing food waste in higher education institutions requires a holistic approach that goes beyond individual behaviors to consider the broader cultural and systemic factors at play. By recognizing the influence of both student practices and institutional constraints, this thesis highlights the need for targeted, context-specific interventions to foster sustainable food consumption and waste reduction on university campuses.Item Housing insecurity and housing rights in times of financialization and global health emergency: Lessons from communities in Brazil(2025) Dias, Sharon Darling de AraĆŗjo; Rose-Redwood, Reuben Skye; Barbosa, Jorge LuisCommunities across the world have been heavily impacted by two interconnected crises: a lack of adequate housing and the Covid-19 pandemic. As some of the primary measures to contain the spread of the coronavirus relied on proper hygiene procedures as well as physical and social isolation and lockdowns, those already in a precarious housing situation and under financial distress suffered during the Covid-19 pandemic in a singular manner needing to be further supported. My research investigates the interplay between precarious housing and the global pandemic in times of ongoing financialization of housing rights, and how this has affected low-income households in Brazil generally and low-income women, gender diverse people and racialized people in particular. To accomplish the goals of this study, I used a community-based participatory approach and partnered with local organizations and community leaders to study housing during the Covid-19 pandemic. Virtual data collection occurred between 2021 and early 2022 followed by in-person fieldwork in the second half of 2022. Additionally, I deployed a mixed-method approach using statistical survey at the country scale, and purposeful and snowball sampling techniques for qualitative data collection. I further analyzed the case of residents living in impoverished communities and in low-income, large-scale housing complexes in Brazil, focusing on Fortaleza Metro Region, the capital of CearĆ” state in northeast Brazil. As results, this research has found complex urban social dynamics in low-income communities in times of pandemic such as the challenges of living in inadequate housing, territorial disputes affecting residentsā everyday life, and chains of solidarity and mutual aid despite the general state of precarity. This study critically analyzes residentsā perspectives on precarious housing and housing development. Hence, a compilation of the respondentsā narratives and perceptions of their everyday life experience as marginalized groups in the context of Covid-19 have pointed to recommendations co-created by community partners and individual participants envisioning the improvement of housing development that target the most vulnerable, and for reviving a progressive housing policy in Brazil, which points to housing needs being addressed through community-based approaches to urban development rather than more mega-projects that build thousands of housing units in peripheral lands. This enables urban and housing development planning and actions that consider the experiences, shocks, knowledge and perspectives of vulnerable residents in post-pandemic times as well as the possibility to use the results for improving community development, pandemic preparedness and housing development for the poor.Item Flushed away: How low and high magnitude turbidity currents affect the bathymetry, morphology and, sedimentation in the Nass Delta submarine channel(2025) Parkinson, Felix; Kwoll, EvaTurbidity currents, a type of sediment density flow, are one of the largest mechanisms of sediment transport in the ocean. They often incise submarine channels that can confine flows and allow them to runout long distances. However, these flow events are poorly understood as they are difficult to monitor directly, and therefore questions remain about how different magnitudes of flow move sediment while interacting with seafloor morphology. The aim of this study was to address some of these knowledge gaps by investigating sediment change in the Nass Delta submarine channel system, a region that had not previously been studied. Here, repeat bathymetric surveys from 2020, 2021, and 2023 were used to calculate bathymetric change to quantify erosion and deposition in the submarine channel system caused by turbidity currents. The results from the first bathymetric change interval (2020-2021) showed little net-change and instead sediment was āshuffledā down system by turbidity currents. This was expressed as predominantly deposition at the head of the channel, an approximate balance of erosion and deposition throughout most of the length of the channel and minor deposition on the lobe. During the second interval (2021-2023), the channel was dominated by erosion, similar to āflushingā flows observed in other channel systems, and the lobe complexes showed net deposition that was an order of magnitude higher than the previous interval. This was interpreted to represent three magnitudes of flows that were either dissipative with a short runout distance, in an auto-suspension state with balanced erosion and deposition, or in an ignition state. These flows resulted in substantial changes to in-channel morphology including aggradation up to 7 m/year and migration up to 70 m/year of crescentic bedforms, up-channel knickpoint migration up to 371 m/year, and the widening of channel bends by up to 45 m/year. Knickpoints were shown to influence the highest rates of erosion in both bathymetric survey intervals. However, only during the erosive, or āflushingā, interval were knickpoints created or removed. The āflushingā interval also caused a channel avulsion which reactivated a distributary channel that had been previously blocked. Here, the term āthresholding flowsā is proposed to describe turbidity currents that change the channel equilibrium state. Although there were no direct measurements of turbidity currents, observations of river discharge, tidal predictions and mass wasting in the canyon indicate that the most likely triggers were either convective settling and remobilization of sediment on the delta or slope failures at the delta lip or canyon. Two facies of turbidite deposits were identified in sediment cores: Facies 1 sand beds, which were interpreted as deposits from higher magnitude flows with the Ta, Tb, Tc, and Td Bouma intervals and Facies 2 sand laminations, which were interpreted as deposits from smaller magnitude flows with Td and Te Bouma intervals. These deposits were dated by creating an age-depth model using excess 210Pb activity, 137Cs activity and 14C ages. This gave a return interval of 25 years for Facies 1 and 10 years for Facies 2 in the mid-channel reaches and 85 years for Facies 1 and 15 to 40 years for Facies 2 in the distal basin meaning that high- and low-density turbidity currents travel up to 22 km from the Nass Delta. These results show that the Nass Delta submarine channel system experiences frequent turbidity current activity that is comparable to other delta submarine channel systems such as the Squamish Delta and Bute Inlet systems, both over short (~1 year) and long (100s years) timescales, and therefore presents both an excellent study site for investigating turbidity current dynamics and poses a considerable hazard to seafloor infrastructure.Item How communities thrive and foster sustainable livelihoods ā An exploratory community-based research with Koforidua Zongo(2024) Zachari, Danae; Tremblay, CrystalIn this thesis, I present an explorative community-based research with members of the Zongo community in the city of Koforidua, Ghana. Drawing on the community-based participatory research (CBPR) theoretical framework, including principles on co-production of knowledge and Indigenization of research, I use in-depth conversations and photo-narratives to explore, with participants, factors that enable individuals and their community to foster health, wellbeing, and sustainable livelihoods. The portrayal of Zongo communities in academic and grey literature has traditionally focused on socioenvironmental issues, thus creating a deficit-based, and incomplete, story of the dynamic lifeworlds and multiple worldviews within Koforidua Zongo (KZ). In contrast, participantsā insights highlight the communityās vibrancy, and its multidimensional sociopolitical, economic, and cultural wealth. The study amplifies participants' voices on the multiple, interconnected, positive factors fostering health and wellbeing at a personal, and community level. Participantsā insights show how shared language, belief system, values, and cultural practices stimulate social cohesion. In addition, they offer narratives of mutual aid and empowerment through examples of how the community operates and mobilizes to support one another. Drawing on what participants shared, I discuss how community members perceive health and wellbeing in a relational manner, in addition to how they understand thriving as a communal process, with the shared responsibility to build mutually supportive and beneficial relations for all.Item Fire regime change in high-value temperate forested watersheds: a paleoecological investigation in the Greater Victoria Water Supply Area (GVWSA) on southern Vancouver Island, British Columbia(2024) Horrelt, Daniel Ross; Bone, Christopher; Brown, KendrickClimate change is driving a global increase in wildfire that is disproportionately impacting temperate coniferous forests. These trends are forecast to continue with regional increases in area burned and extreme fire weather; however, the uncertainty associated with modelling the future extent and magnitude of change in complex fire systems remains a challenge for researchers. Examining historical fire regimes through paleoecological reconstructions of climate, vegetation, and fire can offer insights and can help validate models of future fire environments by characterizing potential analogues in the past. This study investigates the susceptibility of northern coastal temperate forests on Vancouver Island, Canada, to both past and future wildfire disturbance. Sediment cores were extracted from three lakes along a regional east-west precipitation gradient within a high-value forested water supply area. Supplemental data from a previously cored fourth lake within the water supply were also analysed. A comparison between warm-dry early- and cool-moist late-Holocene intervals was used to delineate spatio-temporal changes in fire regime. The results indicate that precipitation was lower in the past, with more open forests that were dominated by invaders and resisters ā two important fire-related plant functional types. The wettest, western-most site experienced the greatest change and had frequent fires in the early-Holocene. This highlights the extent of fire regime shift and suggests that forests currently less predisposed to fire may become vulnerable in the future, the implications of which concern fire probability simulations and management actions to reduce wildfire risk to water supply.Item Spatiotemporal distribution, abundance, and persistence of kelp forests in the Broughton Archipelago, British Columbia, Canada(2024) Man, Long Ching; Costa, MayciraKelp forests are highly productive coastal ecosystems on 25% of the worldās coastlines, providing key biogenic habitats in nearshore ecosystems. These ecosystems are experiencing variable changes worldwide, ranging from detrimental impacts from climate change and pollution to trophic collapses. Still, in British Columbia (BC), Canada, the kelp distribution and drivers of kelp change remain largely unknown in many locations. Thus, local-scale studies are needed to understand kelp dynamics to inform marine spatial planning decisions for coastal practitioners. In particular, the Broughton Archipelago, BC, located in KwakwakaŹ¼wakw territories, supports floating kelp forests of various species compositions and sizes in a spatially explicit environmental gradient across an outer archipelago subregion and an inner fjord subregion. The Mamalilikulla First Nation, ā'NaĢ±mgĢ±is First Nation, and the Kwikwasutāinuxw/Haxwaāmis First Nation, who formed the Broughton Aquaculture Transition Initiative (BATI), are interested in the status and trends of kelp forests due to their utility as juvenile salmon habitat. This research investigates kelp forests' spatiotemporal distribution, abundance, and persistence in the Broughton Archipelago. We first identify environmental and biotic variables that drive spatial differences in kelp forest distribution and abundance. We achieved this by mapping floating kelp abundance (giant kelp: Macrocystis pyrifera, bull kelp: Nereocystis luetkeana) at 31 focal sites across the environmental gradient using unmanned aerial vehicle and high-resolution satellite imagery, compiling environmental data from in-situ sources and environmental models, and characterizing grazer (sea urchins, Strongylocentrus spp. and Mesocentrotus franciscanus) and predator (sunflower sea stars, Pycnopodia helianthoides) abundances from remotely operated vehicle footage. Second, we investigate the spatiotemporal persistence and resilience of kelp forests in the face of climate change. This was achieved by creating long-term (1984 to 2023) and short-term (2016 to 2023) time series of floating kelp areas in association with environmental drivers of change using medium- (30 m) to high- (3 m) resolution satellite imagery, and spatially combining yearly kelp areas to identify spatial patterns of kelp persistence. Overall, we found that the lower sea-surface temperatures, flatter bottom slopes, and higher tidal current speeds typical of the archipelago subregion were positively associated with kelp abundance; whereas the warmer sea-surface temperatures, steeper bottom slopes, and lower tidal current speeds found in the fjord subregion were negatively associated with kelp abundance, reinforcing the known spatial patterns of kelp distribution and abundance found in other studies across the BC coast. Biotically, sea urchin and Pycnopodia abundances did not significantly affect kelp abundance, likely due to low abundances of sea urchins. Kelp forests were temporally persistent, with most kelp areas displaying increases or no change in kelp areas, and kelps were more persistent in their centers than the edges of each kelp bed. These findings provide a baseline understanding of kelp distribution, abundance, persistence, and their associated environmental and biotic drivers in the Broughton Archipelago. Ultimately, this can inform kelp forest conservation and management decisions such as kelp harvesting and kelp restoration for by local communities and First Nations, and contribute to a broader regional understanding of the spatiotemporal patterns of kelp forests in the Northeast Pacific Ocean.Item Using acoustics to explore fin whale (Balaenoptera physalus velifera) ecology and habitat in British Columbia(2024) Rannankari, Lynn; Duffus, David Allan; Burnham, Rianna E.Globally, fin whales (Balaenoptera physalus) were heavily targeted by commercial whaling. Despite this, some populations are recovering; their numbers are increasing in the Southern Hemisphere and North Atlantic. Fin whales are listed as vulnerable on the International Union for Conservation of Nature (IUCN), although populations worldwide show varying degrees of recovery. Fin whales were once the most abundant large cetacean species off the coast of British Columbia (BC). They are currently listed under Canadaās Species at Risk Act (SARA) as Threatened, although their status is currently in consideration for downlisting following recommendations by the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) in 2019. Although fin whales may be returning to coastal areas in BC, efforts to track their recovery in their core habitat, in deeper waters and off the shelf break, has been limited. Much of what is known about their habitat use, ecology and seasonal movements come from details from historical catch records, with recent designated studies looking to refine this knowledge. In this thesis, I consider the potential recovery of fin whales and use acoustic recordings from two study sites in BC waters to analyze their vocalizations. If populations are recovering in BC, recording and analyzing their acoustic behaviour as they rebuild their social and physical connectivity can provide clues to how they are responding after decades of removals. Primarily driven by the considerable number of fin whale vocalizations observed in the acoustic recordings, I create a comparative analysis of fin whale call types to provide finer resolution to the spatial and temporal distributions of vocalizations. The presence of 20 Hz and 40 Hz call types, associated with breeding and foraging behaviour, respectively, were analyzed to determine fin whale habitat use. This comparison analysis indicated fin whales use coastal and offshore areas very differently; considerably higher call presence of both types was observed offshore, and song patterning was only present here. The diverse range of call parameters observed within the 40 Hz call type, particularly from the offshore study location, led to further analysis for the potential for sub-division within this call type. Cluster analysis indicates the structure of 40 Hz call types is more varied than previously recognized and determines five subcategories within the 40 Hz type based on call features. I further explore the potential of subcategories within this call type by analyzing the relative presence of fin whale 40 Hz calls over daily, monthly and seasonal time periods to better understand drivers of the variability. Fin whale song patterns in the offshore acoustic recordings at Clayoquot Slope suggest BC waters are used for courtship, breeding and calving. The difference in song structures may suggest at least two populations using these waters. Although the dominant song pattern structure matched previous findings for the west coast of North America, considerable change in pattern timing was evident. Additionally, new song patterns not previously described for this region were found. Overall, knowledge on whale acoustic use and the value of acoustics to their ecology is still over-simplified, but our understanding increases with deeper study. Some of my observations and understanding of various fin whale acoustic signals have yet to be described in the current literature. Fin whales have a more complicated acoustic repertoire than previously thought and the variety of calls observed indicates BC is an important habitat for recovering populations.Item Forest stand hydrological recovery of snow accumulation and ablation investigated using simultaneous localization and mapping (SLAM) enabled LiDAR(2024) Potter, Cydne Rae; Peters, Daniel Lee; Niemann, OlafForest-snow interactions were analyzed using fine-resolution mobile terrestrial LiDAR in four stands representing increasing forest maturity ranging from a recently replanted clearcut to a mature forest in the interior cedar ā hemlock biogeoclimatic zone of the southern Selkirk Mountain range in British Columbia, Canada. LiDAR-derived models representing peak snow depth and daily ablation were used to assess the impact of sampling intensity on stand-level averages and to determine sampling distances required to capture between-stand differences and within-stand variability. The process of hydrological recovery, a term which describes the return of snow accumulation and ablation processes in regenerating forests to pre-disturbance conditions, was investigated at the scale of individual trees and for the full stand. Outcomes from this study better quantify the influence of tree growth on peak SWE and ablation rate at both the tree and stand level for north aspect mixed conifer stands. The process of negative ablation recovery in early juvenile stands reported in previous studies is herein clearly observed. The methods used increase transferability of outcomes to stands where canopy characteristics (i.e., height, crown cover, and heterogeneity) differ from the reference sites considered here.Item Human recreation in protected areas impacts spatial dynamics and risk-resource trade-offs among a wildlife community(2024) Harbo, Victoria; Bone, ChristopherLarge mammals play critical roles in maintaining ecosystem balance, but their need for expansive, undisturbed habitat makes them particularly vulnerable to human activities. Protected areas are designed to conserve biodiversity by providing refuges for wildlife. However, within these areas, large mammals remain at risk from disturbances due to the growing trend of non-consumptive outdoor recreation. Understanding the effects of human presence on mammal communities and large carnivores like cougars (Puma concolor) is essential for informing effective land and wildlife management. This thesis addresses this need by examining how human presence affects cougarsā risk-resource trade-offs, and then broadening the scope to assess human impacts on a community of large mammals. Data were collected from an array of 48 camera traps across the public-access Sooke Hills Wilderness Area Park (SHWA) and the restricted-access Greater Victoria Water Supply Area (GVWSA) on southern Vancouver Island. In Chapter 2, cougar occurrence was evaluated through competing hypotheses related to habitat, prey, and anthropogenic risk. These results were used to predict cougar occurrence across a network of roads and trails within the study area. Cougar occurrence was best explained by habitat and risk at a 750-meter buffer, where cougars avoided human presence but were more willing to tolerate this risk when their preferred habitat was available in the same area. In Chapter 3, I assessed how a community of large mammals, including Columbian black-tailed deer (Odocoileus hemionus columbianus), Roosevelt elk (Cervus canadensis roosevelti), cougar (Puma concolor), black bear (Ursus americanus), and grey wolf (Canis lupus) responded to landscape heterogeneity, heterospecificsā detection frequency, and land-use restrictions. Differences in community composition between the SHWA and GVWSA revealed that all wildlife species avoided public-access sites, with a clear difference in community composition due to access restrictions. Carnivore species overlapped spatially, suggesting reduced spatial partitioning due to human activity. This thesis shows that site-level human activity can alter risk-resource trade-offs for large carnivores, which can scale upwards to shift species distributions. Given the vulnerability of large mammals to disturbance, it is crucial to consider the impacts of non-consumptive activities on both apex predators and entire wildlife communities.Item Sharing the catch; Social and environmental correlates of body condition in threatened Northern Resident killer whales(2024) Kay, Sharon; Darimont, Chris T.Effective conservation and management should consider a speciesā social dynamics, given that resource scarcity can lead to intragroup conflict. When food is limited, the reallocation of shared resources may incur costs for group members who depend on provisioning or for members that provide shared food. Resident Killer Whales share prey within their stable kin-based groups (matrilines), but little is known about how social group composition might influence allocation of shared prey and associated individual physiological condition. Using drones, we collected aerial images to estimate body condition of Northern Resident Killer Whales over ten years (2014-2023) to evaluate the health of individuals, some across multiple years (n = 175 individuals from 39 matrilines), in a population of approximately 345 whales. Our first objective was to examine the association between individual body condition and the composition of their matrilines, while accounting for salmon availability. Our second objective was to evaluate if mothers with more offspring had lower body condition, and if this relationship depended on their offspring sex. Using two candidate model sets of generalized mixed effect models, we found that social variables influenced body condition. Specifically, males showed declines in body condition as the proportion of juveniles in the matriline increased, while females either showed no change or increased in condition. These sex-specific patterns suggest that males may receive reduced investment through prey sharing in families with more dependent young. Additionally, we found a negative relationship between the body condition of adult females and the number of offspring they have, indicating that adult females may also incur costs in provisioning offspring. Interestingly, these patterns did not depend on salmon abundance. Our results demonstrate how sociality can influence individual health and provides insights into intragroup conflict and parental investment in a species with lifelong parental care and high social stability.Item Social influence on vessel behaviour around cetaceans in the waters of Northeast Vancouver Island(2024) Gladwell, Alison; Darimont, Chris T.When managing human behaviour around wildlife, regulations are often designed to mitigate disturbance to vulnerable species. Yet, patterns and drivers of compliance with such regulations are poorly understood. In partnership with the Marine Education and Research Society, we assessed local compliance rates and examined patterns underlying vessel-whale encounters by observing vessel behaviours around marine mammals. In the summers of 2022 and 2023 (n = 475 observation hours, 902 interactions between marine mammals and boats), we assessed motorized vessel compliance to Canadaās Marine Mammal Regulations and examined a suite of boater behaviours relating to humpback (Megaptera novaeangliae) and killer whales (Orcinus orca) in Northeast Vancouver Island. Recreational and ecotour vessels had similar rates of compliance (85 and 87%, respectively), with the lowest compliance rates around killer whales (74%). Complementary modelling showed that closer distances between vessels and whales were associated with vessels that spent more time with an animal or that were idle. In contrast, greater distances from the whales were associated with interactions involving a higher number of vessels. Assessing other measures of potential disturbance, we found that the number of vessels surrounding an animal varied by study site and was higher in encounters after VHF radio communication about the focal whale compared to encounters without mention. Finally, the time a vessel spent with a whale was higher for vessels at idle and slow/medium speeds compared to vessels travelling at faster speeds. Results from this work can inform geographic and practical areas of focus for education, enforcement and policy development.Item Insights into cetacean habitat use in British Columbia using visual and acoustic methods(2024) DeMeyer, Roanan; Duffus, David Allan; Burnham, Rianna E.Cetaceans play critical roles in marine ecosystems as top predators and ecosystem engineers. In British Columbia (BC), cetacean populations are recovering from industrial whaling and responding to other anthropogenic pressures, such as vessel noise, climate change, and ship strikes. Protecting these populations requires knowledge of their habitat use patterns to inform effective management. In this thesis, I use visual and acoustic methods to contribute to the historical and current knowledge of cetacean habitat use in BCās waters. In Chapter 2, I use visual data gathered via transect line surveys offshore of Clayoquot Sound, BC, between 1993 and 2007. These surveys yielded observations of eleven cetacean species. Analyses of habitat variables indicated significant interspecific differences in habitat use, a negative correlation between Dallās porpoise group size and sea-surface temperature, and an increased offshore distance for the southward gray whale migration. Interannual changes in sighting rates reflected known population dynamics, while seasonal changes supported inshore-offshore movement patterns for Dallās porpoise and Pacific white-sided dolphins. In Chapter 3, I use acoustic data gathered from two hydrophones deployed on the east and west coasts of Haida Gwaii in Gwaii Haanas National Park Reserve, National Marine Conservation Area Reserve, and Haida Heritage Site from August 2018 to August 2019. Manual analyses of these data were used to identify cetacean call and vessel presence. At least eight species were identified and foraging, breeding, and migratory habitat uses were inferred from call timing and behavioural associations of call types. The maximum frequencies of the loudest identified vessel noise were measured and overlap with cetacean call frequencies, as well as the co-occurrence of cetacean calls and vessels, suggest the potential for call masking and disturbance. Large and small vessels were more common on the west and east coasts, respectively, and these findings inform site-specific noise management recommendations. In Chapter 4, I use these acoustic data to provide insights into the gray whale migration route and habitat use, since these are poorly understood in northern BC. Gray whales were only detected during the northward migration on the east coast, suggesting that the migrations primarily occurred outside the hydrophone detection ranges. The visual and acoustic monitoring conducted in this thesis contributes to cetacean conservation by advancing our understanding of cetacean habitat use and vessel presence in BC.Item Mapping coastal habitats using an imaging spectrometer(1993) Zacharias, MarkItem Monitoring spatial and temporal patterns structuring eelgrass (Zostera marina L.) fish diversity in Clayoquot Sound(2003) Yakimishyn, Jennifer Lee-AnnThe linking of temporal variability in biodiversity with spatial scale is an integral component of marine conservation. In this study, I evaluated the interplay between the temporal variability in fish communities and local-to-regional environmental properties measured for eelgrass beds (Zostera marina) found in southern Clayoquot Sound, British Columbia. Effective monitoring of the temporal variability in eelgrass fish diversity required: 1) triplicate beach seine sets on a rising low tide, 2) sampling in early spring, early summer and late summer, and 3) diel sampling. The analysis of eelgrass fish data required alpha diversity measures (e.g. species richness and taxonomic distinctness), beta diversity measures ( e.g. taxonomic similarity), and multivariate methods to detect subtle temporal and between-site differences. Additional temporal changes in eelgrass fish diversity were evaluated in response to changes in local eelgrass bed properties and to regional changes in hydrodynamic energy. I found, in late spring, fish diversity differed between sites but these differences were not explained by eelgrass properties or hydrodynamic energy. However, in late summer, fish diversity appeared to be related to regional hydrodynamic energy but the explanatory power of local environmental and eelgrass variables was not high. Further research addressing additional abiotic variables and the influence of biotic processes is recommended.Item A preliminary seismic microzonation of Victoria, British Columbia(1974) Wuorinen, ValEarthquakes represent the most serious catastrophic natural hazard in the Victoria area. The city is in Zone 3, the highest Canadian risk category, and an earthquake capable of generating intensity VIII on the Modified Mercalli Scale is postulated with a return period of one hundred years. However, because of differences in local ground conditions, the actual intensity of shaking during an earthquake may be expected to vary considerably. A seismic microzonation map showing this anticipated spatial variation in intensity is obviously required to enable decision makers to evaluate possible alternatives in reducing the harmful effects of future earthquakes. This study aims to provide such a microzonation of the city of Victoria. It is based on a geomorphological, investigation of local bedrock topography and Quaternary stratigraphy, and includes an intensity survey of the last earthquake, occurring in 1946, which caused extensive damage in the city. From a study of borehole data, city engineering reports, pre-development maps, and fieldwork, a three dimensional overview of the city's geomorphology was obtained and mapped. By interviewing persons who had been in Victoria during the 1946 earthquake, over two hundred intensity ratings for that event, ranging from III to VII, were obtained. An attempt was then made to explain the spatial variations in intensity by correlation with possible causal variables. A strong correlation was found to occur between intensity experienced and round conditions, so providing the basis for the development of a three-zone microzonation map of Victoria. On this model, intensities lower than average can be expected in areas where bedrock appears within ten feet of the surface, while in contrast higher than average intensities are anticipated in areas underlain by thick Victoria clay. Over one-half of Victoria falls into the first category, while only small areas of unfavourable ground have been identified. At present, the only human adjustments to the seismic hazard in Victoria appear to be the application of earthquake-resistant building regulations to major structures and individual insurance policies. It is hopedĀ that the microzonation map included in this study may serve to heighten the perception of risk and so stimulate a greater range of social adjustments.Item Neoglaciation and dendroglaciology at the Saskatchewan glacier, Banff National Park, Canadian Rocky Mountains(2002) Wood, Christopher AndrewThe purpose of this study was to examine the Neoglacial history of the Saskatchewan Valley in BanffNational Park. Geomorphic history was explored through an examination of exposed facies and a proxy climate record was established during a two-century interval of the Neoglacial Advance using dendroclimatological techniques. An exposed Neoglacial subfossil forest was discovered in the proglacial environment of the Saskatchewan Glacier. This in-situ forest was sampled extensively, as were other detrital logs in the area. The samples were then identified to species and built into floating tree-ring chronologies. Of three sampled species, only subalpine fir formed a significantly strong chronology that could be statistically analysed. Nearby living forests were sampled to build master chronologies that could be compared to meteorological climate records and examined for their response to local climate. The derived response function for the living subalpine fir chronology established that July temperature was the primary variable determining tree-growth. This response function was then applied to floating chronology to establish a proxy-climate record of July temperature.