School of Environment and Sustainability

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A typology of transdisciplinary learning and capacity development in sustainability science: WHO IS DOING WHAT, WHERE, AND HOW?
(2024) Cockburn, Jessica; Reed, Maureen; Robson, James; Rosenberg, Eureta; Lotz-Sisitka, Heila; Mora-Sanchez, Constanza; Mvulane, Wandile
Above- and Below-Ground Carbon Sequestration in Shelterbelt Trees in Canada: A Review
(MDPI, 2019) Mayrinck, Rafaella; Laroque, Colin; Amichev, Beyhan; Rees, Ken Van
Shelterbelts have been planted around the world for many reasons. Recently, due to increasing awareness of climate change risks, shelterbelt agroforestry systems have received special attention because of the environmental services they provide, including their greenhouse gas (GHG) mitigation potential. This paper aims to discuss shelterbelt history in Canada, and the environmental benefits they provide, focusing on carbon sequestration potential, above- and below-ground. Shelterbelt establishment in Canada dates back to more than a century ago, when their main use was protecting the soil, farm infrastructure and livestock from the elements. As minimal-and no-till systems have become more prevalent among agricultural producers, soil has been less exposed and less vulnerable to wind erosion, so the practice of planting and maintaining shelterbelts has declined in recent decades. In addition, as farm equipment has grown in size to meet the demands of larger landowners, shelterbelts are being removed to increase efficiency and machine maneuverability in the field. This trend of shelterbelt removal prevents shelterbelt’s climate change mitigation potential to be fully achieved. For example, in the last century, shelterbelts have sequestered 4.85 Tg C in Saskatchewan. To increase our understanding of carbon sequestration by shelterbelts, in 2013, the Government of Canada launched the Agricultural Greenhouse Gases Program (AGGP). In five years, 27 million dollars were spent supporting technologies and practices to mitigate GHG release on agricultural land, including understanding shelterbelt carbon sequestration and to encourage planting on farms. All these topics are further explained in this paper as an attempt to inform and promote shelterbelts as a climate change mitigation tool on agricultural lands.
Applying a two-dimensional hydrodynamic model to estimate fish stranding risk downstream from a hydropeaking hydroelectric station
(Wiley Online Library, 2023) Glowa, Sarah; Kneale, Andrea; Watkinson, Douglas A.; Ghamry, Haitham K.; Enders, Eva; Jardine, Timothy
Fish stranding is of global concern with increasing hydropower operations using hydropeaking to respond to fluctuating energy demand. Determining the effects hydropeaking has on fish communities is challenging because fish stranding is dependent on riverscape features, such as topography, bathymetry and substrate. By using a combination of physical habitat assessments, hydrodynamic modelling and empirical data on fish stranding, we estimated the number of fish stranding over a 5-month period for three model years in a large Prairie river. More specifically, we modelled how many fish potentially stranded during the years 2019, 2020 and 2021 across a 16 km study reached downstream from E.B. Campbell Hydroelectric Station on the Saskatchewan River, Canada. Fish stranding densities calculated from data collected through remote photography and transect monitoring in 2021 were applied to the daily area subject to drying determined by the River2D hydrodynamic model. The cumulative area subject to change was 90.05, 53.02 and 80.74 km2 for years 2019, 2020 and 2021, respectively, from June to October. The highest number of stranded fish was estimated for the year 2021, where estimates ranged from 89,800 to 1,638,000 individuals based on remote photography and transect monitoring fish stranding densities, respectively, 157 to 2,856 fish stranded per hectare. Our approach of estimating fish stranding on a large scale allows for a greater understanding of the impact hydropeaking has on fish communities and can be applied to other riverscapes threatened by hydropeaking.Fish stranding is of global concern with increasing hydropower operations using hydropeaking to respond to fluctuating energy demand. Determining the effects hydropeaking has on fish communities is challenging because fish stranding is dependent on riverscape features, such as topography, bathymetry and substrate. By using a combination of physical habitat assessments, hydrodynamic modelling and empirical data on fish stranding, we estimated the number of fish stranding over a 5-month period for three model years in a large Prairie river. More specifically, we modelled how many fish potentially stranded during the years 2019, 2020 and 2021 across a 16 km study reached downstream from E.B. Campbell Hydroelectric Station on the Saskatchewan River, Canada. Fish stranding densities calculated from data collected through remote photography and transect monitoring in 2021 were applied to the daily area subject to drying determined by the River2D hydrodynamic model. The cumulative area subject to change was 90.05, 53.02 and 80.74 km2 for years 2019, 2020 and 2021, respectively, from June to October. The highest number of stranded fish was estimated for the year 2021, where estimates ranged from 89,800 to 1,638,000 individuals based on remote photography and transect monitoring fish stranding densities, respectively, 157 to 2,856 fish stranded per hectare. Our approach of estimating fish stranding on a large scale allows for a greater understanding of the impact hydropeaking has on fish communities and can be applied to other riverscapes threatened by hydropeaking.
“Are you prepared or not?”: An intersectional analysis of a community-engaged climate change vulnerability assessment and adaptation planning process with Tsáá? Ché Ne Dane
(Environmental Science and Policy, 2024-12-30) Sidloski, Michaela; Reed, Maureen; Andrews-Key, Sheri
Intersectional analyses of climate hazards have demonstrated that social dimensions play important roles in how people experience and respond to climate change and extreme weather events. Despite these insights, inter- sectional scholarship has faced criticism around its theoretical orientation and the resulting challenges of doing applied intersectional research to understand social dimensions of climate change. This article demonstrates the value of an intersectional feminist lens to community-level planning for climate change. Working with an Indigenous community in northern British Columbia, Canada, the research revealed that social dimensions including culture, age, gender, and spirituality combined in distinct and various ways to influence how the community framed the problem of climate change, expressed agency, understood impacts and vulnerability, and proposed responses. Attending to these dimensions throughout a community-engaged climate change vulnera- bility assessment and adaptation planning process illuminated differences among groups, while also exposing shared goals and areas of overlap among diverse perspectives and worldviews. Beyond exposing commonalities, consistent consideration of social dimensions also enhanced local adaptive capacity and shaped the planning and decision-making process by informing project framing and design, methods selection and participant recruit- ment, and developing meaningful outputs. We use this evidence to demonstrate the practical application of an intersectional lens and to explain how embedding consideration of social dimensions within climate change vulnerability assessment and adaptation planning processes can produce better contextualization, greater buy-in, and more meaningful outcomes for communities across Canada and beyond.
Assessing and Mitigating Ice-Jam Flood Hazards and Risks: A European Perspective
(MDPI, 2022) Lindenschmidt, Karl-Erich; Alfredsen, Knut Tore; Carstensen, Dirk; Choryński, Adam; Gustafsson, David; Halicki, Michał; Hentschel, Bernd; Karjalainen, Niina; Kögel, Michael; Kolerski, Tomasz; Korna´s-Dynia, Marika; Kubicki, Michał; Kundzewicz, Zbigniew; Lauschke, Cornelia; Marszelewski, Włodzimierz; Möldner, Fabian; Näslund-Landenmark, Barbro; Niedzielski, Tomasz; Parjanne, Antti; Pawłowski, Bogusław; Pińskwar, Iwona; Remisz, Joanna; Renner, Maik; Roers, Michael; Rybacki, Maksymilian; Szałkiewicz, Ewelina; Szydłowski, Michał; Walusiak, Grzegorz; Witek, Matylda Katarzyna; Zagata, Mateusz; Zdralewicz, Maciej
The assessment and mapping of riverine flood hazards and risks is recognized by many countries as an important tool for characterizing floods and developing flood management plans. Often, however, these management plans give attention primarily to open-water floods, with ice-jam floods being mostly an afterthought once these plans have been drafted. In some Nordic regions, ice-jam floods can be more severe than open-water floods, with floodwater levels of ice-jam floods often exceeding levels of open-water floods for the same return periods. Hence, it is imperative that flooding due to river ice processes be considered in flood management plans. This also pertains to European member states who are required to submit renewed flood management plans every six years to the European governance authorities. On 19 and 20 October 2022, a workshop entitled “Assessing and mitigating ice-jam flood hazard and risk” was hosted in Pozna´ n, Poland to explore the necessity of incorporating ice-jam flood hazard and risk assessments in the European Union’s Flood Directive. The presentations given at the workshop provided a good overview of flood risk assessments in Europe and how they may change due to the climate in the future. Perspectives from Norway, Sweden, Finland, Germany, and Poland were presented. Mitigation measures, particularly the artificial breakage of river ice covers and ice-jam flood forecasting, were shared. Advances in ice processes were also presented at the workshop, including state-of-the-art developments in tracking ice-floe velocities using particle tracking velocimetry, characterizing hanging dam ice, designing new ice-control structures, detecting, and monitoring river ice covers using composite imagery from both radar and optical satellite sensors, and calculating ice-jam flood hazards using a stochastic modelling approach.
Assessing the fate of brown trout (Salmo trutta) environmental DNA in a natural stream using a sensitive and specific dual-labelled probe
(Elsevier, 2019) Deutschmann, Björn; Müller, Anne-Kathrin; Hollert, Henner; Brinkmann, Markus
Environmental DNA (eDNA) analysis in the aquatic environment has emerged as a promising tool for diagnosis of the ecological status in comprehensive monitoring strategies and might become useful in context of the European Water Framework Directive (WFD) and other legislations to derive stressor-specific indicators. Despite many studies having made significant progress for the future use of eDNA in terms of ecosystem composition and detection of invasive/rare species in inland waters, much remains unknown about the transport and fate of eDNA under natural environmental conditions. We designed a specific dual-labelled probe to detect brown trout (Salmo trutta, L.) eDNA and used the probe to describe the fate of eDNA released from an aquaculture facility into the low mountain range stream Wehebach, Germany. The probe was shown to be specific to brown trout, as ponds housing rainbow trout (Oncorhynchus mykiss) did not test positive. Even though we observed different strengths of eDNA signals for three ponds containing different brown trout quantities, no significant correlation was found between biomass (kg/L) and eDNA quantity. Our results indicate that the release of DNA from brown trout might be life stage and/or age-dependent. The effluents of the aquaculture facility were a source of high levels of eDNA which resulted in the greatest abundance of brown trout eDNA directly downstream of the facility. Despite the natural occurrence of brown trout in the Wehebach, as shown by ecological investigations conducted by authorities of the federal state of North Rhine-Westphalia (Germany) and personal observations, we observed a significant decrease of relative abundance of eDNA in the Wehebach within the first 1.5 km downstream of the aquaculture. Our results suggest that concentrations of eDNA in running waters rapidly decrease under natural conditions due to dilution and degradation processes, which might have important implications for the utility of eDNA in environmental research.
Assessing the Readiness and Capacity of Biosphere Regions to Implement Equity, Diversity, and Inclusion - A Desktop Review
(2024-09) Boakye-Danquah, John; Marfo, Crenda O
This report present the findings of a desktop review sponsored by the TRANSECTS to examine the readiness and capacity of Biosphere Regions (BR) in Canada and other conservation organizations to implement Equity, Diversity and Inclusion (EDI). The search was limited to broad EDI considerations focusing on terms such as “equity”, “diversity”, “equality”, “inclusion”, “accessibility”, “justice”, “minority”, “reconciliation”, “SDG 5” and “SDG 10”. The findings revealed that majority of BRs and similar conservation organizations are actively engaging in reconciliation efforts. These efforts include collaborative planning with Indigenous communities, acknowledging traditional territories, providing services for Indigenous youth, and incorporating Indigenous knowledge into conservation and sustainability initiatives. The integration of EDI varies across BRs. Twelve BR websites included at least one reference to an EDI term, while five did not mention EDI terms. Key findings include: 66% of BRs referenced "diversity," primarily highlighting the inclusion of cultural knowledge in work practices and ensuring diverse representation among staff, board members, and volunteers. 28% of BRs mentioned "inclusion" as a core value, particularly in hiring practices, community engagement, and knowledge creation. 22% of BRs integrated "equity" into mission and vision statements, focusing on improving recruitment, promoting economic fairness, and ensuring justice for diverse community needs. Some also emphasized internal equity initiatives for staff. Only 6% of BRs referenced "accessibility," acknowledging the need for accommodations for people with disabilities in hiring practices. 22% of BRs referenced SDG 5 (gender equality) and SDG 10 (reduced inequalities). BRs primarily emphasized Indigenous Peoples and Youth in their equity efforts. Other equity groups, including women, people with disabilities, racialized/visible minorities, older adults, and 2SLGBTQ+ individuals, received comparatively less focus from BRs.
Behind the scenes with genomics researchers
(Frontiers in Genetics, 2024-12) Mont'Alverne, Renata; Bradford, Lori; Buckmaster, Cheryl; Strickert, Graham; MacLean, Jason; Dupont, Diane
Although lab-coat genomics scientists are highly skilled and involved in pioneering work, few studies have examined their perceptions on what they do, and how they relate with others in interdisciplinary work. Recognizing that gap, we were curious to talk with scientists about their current work and positionalities related to the use of genomics for bioremediation. Using unstructured open-ended interviews and thematic analysis, we interviewed researchers with diverse genomics-related expertise. Emerging topics were grouped into two broad categories akin to Bronfenbrenner’s nested developmental model: microsystem matters, comprising technical advances, barriers, and localized concerns; and macrosystem matters, exploring wider reflections and the philosophies of genomics and society. At the microsystem level, findings revealed differences of opinion about methodological steps, but there was agreement about the incompleteness of databases and the absence of established reference values. These two problems may not only impact a project’s progress but also the ability to gauge success, affecting budgeting, human resource needs, and overall stress. At the macrosystem level, scientists voiced concerns about how different social groups perceive and accept genomics applications, as those tend to be viewed by lay persons as genetic interventions. Another focus was on how academic publication slows progress because it is orientated toward positive results while gaps in knowledge could be filled by publishing negative results or methodological barriers. This study underscores scientists’ self-awareness within the genomics discipline, acknowledging how their beliefs and biases shape research outcomes. It illuminates critical reflections essential for navigating societal and scientific landscapes in genomics research.
Bias-Corrected RADARSAT-2 Soil Moisture Dynamics Reveal Discharge Hysteresis at An Agricultural Watershed
(MDPI, 2023) Lee, Ju Hyoung; Lindenschmidt, Karl-Erich
Satellites are designed to monitor geospatial data over large areas at a catchment scale. However, most of satellite validation works are conducted at local point scales with a lack of spatial representativeness. Although upscaling them with a spatial average of several point data collected in the field, it is almost impossible to reorganize backscattering responses at pixel scales. Considering the influence of soil storage on watershed streamflow, we thus suggested watershed-scale hydrological validation. In addition, to overcome the limitations of backscattering models that are widely used for C-band Synthetic Aperture Radar (SAR) soil moisture but applied to bare soils only, in this study, RADARSAT-2 soil moisture was stochastically retrieved to correct vegetation effects arising from agricultural lands. Roughness-corrected soil moisture retrievals were assessed at various spatial scales over the Brightwater Creek basin (land cover: crop lands, gross drainage area: 1540 km2) in Saskatchewan, Canada. At the point scale, local station data showed that the Root Mean Square Errors (RMSEs), Unbiased RMSEs (ubRMSEs) and biases of Radarsat-2 were 0.06~0.09 m3/m3, 0.04~0.08 m3/m3 and 0.01~0.05 m3/m3, respectively, while 1 km Soil Moisture Active Passive (SMAP) showed underestimation at RMSEs of 0.1~0.22 m3/m3 and biases of 􀀀0.036~􀀀0.2080 m3/m3. Although SMAP soil moisture better distinguished the contributing area at the catchment scale, Radarsat-2 soil moisture showed a better discharge hysteresis. A reliable estimation of the soil storage dynamics is more important for discharge forecasting than a static classification of contributing and noncontributing areas.
Bioactivation of Quinolines in a Recombinant Estrogen Receptor Transactivation Assay Is Catalyzed by N-Methyltransferases
(ACS Publications, 2019) Brinkmann, Markus; Barz, Bogdan; Carrière, Danielle; Velki, Mirna; Smith, Kilian; Meyer-Alert, Henriette; Müller, Yvonne; Thalmann, Beat; Bluhm, Kersti; Schiwy, Sabrina; Hotz, Simone; Salowsky, Helena; Tiehm, Andreas; Hecker, Markus; Hollert, Henner
Hydroxylation of polyaromatic compounds through cytochromes P450 (CYPs) is known to result in potentially estrogenic transformation products. Recently, there has been an increasing awareness of the importance of alternative pathways such as aldehyde oxidases (AOX) or N-methyltransferases (NMT) in bioactivation of small molecules, particularly N-heterocycles. Therefore, this study investigated the biotransformation and activity of methylated quinolines, a class of environmentally relevant N-heterocycles that are no native ligands of the estrogen receptor (ER), in the estrogen-responsive cell line ERα CALUX. We found that this widely used cell line overexpresses AOXs and NMTs while having low expression of CYP enzymes. Exposure of ERα CALUX cells to quinolines resulted in estrogenic effects, which could be mitigated using an inhibitor of AOX/NMTs. No such mitigation occurred after coexposure to a CYP1A inhibitor. A number of N-methylated but no hydroxylated transformation products were detected using liquid chromatography–mass spectrometry, which indicated that biotransformations to estrogenic metabolites were likely catalyzed by NMTs. Compared to the natural ER ligand 17β-estradiol, the products formed during the metabolization of quinolines were weak to moderate agonists of the human ERα. Our findings have potential implications for the risk assessment of these compounds and indicate that care must be taken when using in vitro estrogenicity assays, for example, ERα CALUX, for the characterization of N-heterocycles or environmental samples that may contain them.
Blooms and flows: Effects of variable hydrology and management on reservoir water quality
(Wiley Open Access (Commercial Publisher); Ecological Society of America (Society Publisher), 2023) Painter, Kristin; Venkiteswaran, Jason J.; Baulch, Helen
Flow management has the potential to significantly affect ecosystem condition. Shallow lakes in arid regions are especially susceptible to flow management changes, which can have important implications for the formation of cyanobacterial blooms. Here, we reveal water quality shifts associated with changing source water inflow management. Using in situ monitoring data, we studied a seven-year time span during which inflows to a shallow, eutrophic drinking water reservoir transitioned from primarily natural landscape runoff (2014–2015) to managed flows from a larger upstream reservoir (Lake Diefenbaker; 2016–2020) and identified significant changes in cyanobacteria (as phycocyanin) using generalized additive models to classify cyanobacterial bloom formation. We then connected changes in water source with shifts in chemistry and the occurrence of cyanobacterial blooms using principal components analysis. Phycocyanin was greater in years with managed reservoir inflow from a mesotrophic upstream reservoir (2016–2020), but dissolved organic matter (DOM) and specific conductivity, important determinants of drinking water quality, were greatest in years when landscape runoff dominated lake water source (2014–2015). Most notably, despite changing rapidly, it took multiple years for lake water to return to a consistent and reduced level of DOM after managed inflows from the upstream reservoir were resumed, an observation that underscores how resilience may be hindered by weak resistance to change and slow recovery. Environmental flows for water quality are rarely defined, yet we show that trade-offs exist between poor water quality via elevated conductivity and DOM and higher bloom risk, depending on water source. Our work highlights the importance of source water quality, not just quantity, to water security, and our findings have important implications for water managers who must protect ecosystem services while adapting to projected hydroclimatic change.
Bridging the Gap: Advancing Ecological Risk Assessment from Laboratory Predictions to Ecosystem Reality
(ACS Publications, 2024-10-07) 廖, 伟; Hou, Lin; Liu, Na; Xu, Jian; Zhang, Xiaowei; Hollert, Henner; Johnson, Andrew; Giesy, John; Wu, Fengchang
The evolution of ecological risk assessment (ERA) for contaminants has been a topic that has continued to evolve over the past 30 years, but it is important to ask ourselves whether it remains up to date. Initially, the process focused on sub-individual end points; ERA has since expanded to encompass landscape-level analyses. After focusing entirely on single substances, we now recognize the reality of exposure to contaminant mixtures. Assessment techniques have progressed from a simplistic risk quotient method to more sophisticated probabilistic approaches as the library of chemical monitoring and toxicity test data has expanded. The probabilistic approaches, where they can be applied, have reduced uncertainty, yet the link to real outcomes in the field is rarely established.
Bridging theory and practice through Transdisciplinary Learning Labs to build sustainability competencies in higher education
(World Environmental Education Congress, 2024) Rosenberg, Eureta
Broadening the spectrum of conflict and coexistence: A case study example of human-wolf interactions in British Columbia, Canada
(PLoS One, 2025-02) Doney, Ethan; Frank, Beatrice; Clark, Douglas A
Coexistence has seen an explosive rise within conservation social science scholarship. While this represents an exciting shift in the field, many academics are still skeptical. Some scholars have expressed concerns around the omission of “conflict”, naïveté, and impracticality associated with coexistence literature. In this paper, we aim to demonstrate that critiques of coexistence often stem from reductionism and decontextualization, process inefficiencies and/or inequities, failure to address and prioritize human well-being as a goal, and a lack of tools to foster open, collaborative dialogue. We draw on a case study of human-wolf interactions in the Pacific Rim National Park Reserve Region, British Columbia, Canada, to illustrate how coexistence efforts can, and should, prioritize “conflict”, be attentive to the real challenges of sharing spaces with wildlife, and encourage collaborative, inclusive processes that work toward tangible, actionable outcomes. We conducted 32 semi-structured interviews with residents from diverse backgrounds and levels of experience with wolves in the region. From these interviews, we articulated novel, co-developed, contextual definitions of human-wolf conflict and coexistence in the region. We then developed a collaborative tool for visualizing behavioral and cognitive elements of human-wildlife interactions through open and inclusive dialogue, using real examples from these research interviews. The research findings highlight three main principles: (1) that conflict and coexistence are contextual and should be understood as such, (2) that coexistence requires collaborative processes that pay attention to equity and inclusivity, and (3) that there are frameworks or tools that can help facilitate discussions toward practical outcomes of coexistence projects. We believe that this paper helps to disambiguate coexistence and reinforce that coexistence requires focused attention to the well-being of people as much as wildlife.
Can Monitoring and Evaluation Advance our Education, Advocacy and Action?
(Environmental Education Association of Southern Africa (EEASA), 2023) Rosenberg, Eureta
A reflective question posed as part of an NRF CoP Project of the Environmental Learning Research Centre at Rhodes University - Towards Transformative Monitoring, Evaluation and Learning in Landscapes
Chronic radium-226 bioaccumulation and toxicity in the aquatic invertebrate Daphnia magna
(Springer, 2025-01-06) Lacroix-Durand, Charlotte; Janz, David; Liber, Karsten
Mining operations in Canada, including uranium mining and milling, generate by-products containing radionuclides, including radium-226 (226Ra), a long-lived, bioaccumulative calcium (Ca2+) analog. Despite strict discharge regulations, there is limited evidence to suggest that current thresholds for 226Ra adequately protect aquatic organisms. Furthermore, Canada lacks a federal water quality guideline for 226Ra, underscoring the need for protective limits to safeguard aquatic ecosystems. Hence, this research aimed to generate data on 226Ra toxicity to the model aquatic invertebrate Daphnia magna. For this purpose, two 21-day chronic toxicity tests with D. magna were conducted, with survival and reproduction as the endpoints, as well as a reduced water hardness experiment, a multigenerational study, and a bioaccumulation assay. These experiments demonstrated that a high activity concentration (nominal 50 Bq/L) of 226Ra can significantly impact the survival of D. magna. 226Ra was also found to bioaccumulate in D. magna with a BAF of 72.8. Since the Canadian Metal and Diamond Mining Effluent Regulations (MDMER) monthly mean effluent limit is currently set at 0.37 Bq 226Ra /L, the limit for composite samples at 0.74 Bq/L 226Ra, and the limit for grab samples at 1.11 Bq/L 226Ra, it is unlikely that toxic effects to aquatic cladocerans like D. magna from 226Ra will be observed downstream of Canadian mines and mills.
Chronic Radium-226 Toxicity to and Oxidative Stress in the Aquatic Invertebrate Chironomus dilutus
(Oxford University Press, 2025-01-12) Lacroix-Durand, Charlotte; Janz, David; Liber, Karsten
The mining industry, including uranium mining and milling, is of high importance in Canada. It is, however, important to consider that ore processing can result in the creation of by-products that contain radionuclides such as radium-226 (226Ra). Even with the strict discharge regulations in place, there is limited evidence to suggest that the current Canadian regulatory thresholds for 226Ra are protective for aquatic life. This concern underscores the importance of generating toxicity data for 226Ra, as no federal Canadian water quality guidelines for 226Ra currently exist to safeguard aquatic ecosystems. The potential ecological risks of 226Ra are significant due to its high mobility under typical environmental conditions, long half-life (t1/2 ~ 1,600 years), bioaccumulative properties, and similarity to calcium (Ca2+). Considering this, the primary objective of this research was to gather data on the toxicity of 226Ra to the aquatic invertebrate Chironomus dilutus. For this purpose, a partial life cycle experiment was conducted, with larval growth, survival and pupation, and emergence and sex ratio of emerged adults, as the experimental endpoints. In addition, an assessment of oxidative stress as a potential cause of toxicity was performed. These experiments revealed that elevated activity concentrations of 226Ra (25.5 Bq/L) can significantly impact the growth of C. dilutus. However, none of the other nonlethal endpoints were significantly affected by 226Ra exposure, and there was no evidence of oxidative stress in exposed C. dilutus. Finally, 226Ra was shown to adsorb onto the silica sand used as a substrate for all experiments and desorbed following acid extraction.
Collaboratively training transdisciplinary scholars and practitioners: Exploring challenges and opportunities in the COVID-19 pandemic context.
(International Transdisciplinarity Conference: Creating Spaces And Cultivating Mindsets For Learning And Experimentation., 2021-09) Reed, Maureen; Cockburn, Jessica; Mora, Constanza; Mvulane, Wandile; Robson, James; Rosenberg, Eureta; Lotz-Sisitka, Heila
Community Governance for Small Modular Reactor (SMR) Development: Lessons from Northern and Indigenous Energy Projects
(The Northern Review, 2024) Iakovleva, Mariia
Remote Indigenous communities in northern Canada often suffer from energy insecurity and energy poverty. In developing local clean energy production, there is an obvious benefit for government and industry partnering with these communities. However, the record of these partnerships is poor, with some failing to produce the expected benefits and others failing to get off the ground at all. This article is based on a study of four case studies of renewable energy projects in Indigenous communities in northern Saskatchewan and Alberta, in which I interviewed community project leaders to understand why these communities were interested in energy projects, what they hoped to achieve, and their experience with their partners. I also interviewed government and industry partners. While the results underline the importance of Indigenous intermediaries who can move easily between the communities and the larger energy production context, they also reveal a fundamental misalignment of expectations between Indigenous communities and their partners. Recent discussions about the potential for small modular nuclear reactors (SMRs) in remote communities have generally focused on features of the technology rather than on aspects of the social context of Indigenous communities. I argue that, for communities to fully understand the advantages and drawbacks of this technology, much more attention needs to be paid to the construction of a safe space where communities can frame the discussion within Indigenous world views and lived experience. I offer some policy suggestions for how this space can be constructed and protected.
Comparative analysis of cadmium uptake and distribution in contrasting canadian flax cultivars
(BMC, 2020) House, Megan; Young, Lester W.; Liu, Xia; Liber, Karsten; Diederichsen, Axel; Booker, Helen
Objective: Humans consume low quantities of cadmium (Cd), a non-nutritive and potentially toxic heavy metal, primarily via the dietary intake of grains. A trial experiment was conducted to investigate physiological and developmental differences in Cd content in four flax cultivars (‘AC Emerson’, ‘Flanders’, ‘CDC Bethune’, and ‘AC McDuff’) as part of a study to provide information that will assist in the breeding of low Cd-accumulating flax cultivars. Our objective was to identify varietal differences in the uptake and distribution of Cd in various tissues among flax cultivars grown in naturally Cd-containing soil in a controlled environment. Results: Cadmium concentration was dependent on genotype, developmental stage, and tissue type, as well as their interaction. Cadmium concentration was higher in roots and leaves, relative to all other tissues, with a general trend of decreasing Cd content over time within leaves and stems. Notably, the concentration of Cd was higher in ‘AC Emerson’ relative to ‘AC McDuff’ across tissues and ages, including the seeds, while the concentration of ‘Flanders’ was higher than in ‘AC McDuff’ in seeds and other reproductive organs but similar in roots and leaves. The results suggest varietal differences in the mechanisms that determine Cd content in seeds.

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