School of Environment and Sustainability
Permanent URI for this collection
Browse
Browsing School of Environment and Sustainability by Title
Now showing 1 - 20 of 48
Results Per Page
Sort Options
Item Above- and Below-Ground Carbon Sequestration in Shelterbelt Trees in Canada: A Review(MDPI, 2019) Mayrinck, Rafaella; Laroque, Colin; Amichev, Beyhan; Rees, Ken VanShelterbelts 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.Item 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, TimothyFish 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.Item “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, SheriIntersectional 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.Item 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, MaciejThe 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.Item 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, MarkusEnvironmental 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.Item Assessing the Readiness and Capacity of Biosphere Regions to Implement Equity, Diversity, and Inclusion - A Desktop Review(2024-09) Boakye-Danquah, John; Marfo, Crenda OThis 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.Item Behind the scenes with genomics researchers(Frontiers in Genetics, 2024-12) Mont'Alverne, Renata; Bradford, Lori; Buckmaster, Cheryl; Strickert, Graham; MacLean, Jason; Dupont, DianeAlthough 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.Item Bias-Corrected RADARSAT-2 Soil Moisture Dynamics Reveal Discharge Hysteresis at An Agricultural Watershed(MDPI, 2023) Lee, Ju Hyoung; Lindenschmidt, Karl-ErichSatellites 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.Item 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, HennerHydroxylation 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.Item 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, HelenFlow 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.Item Community Governance for Small Modular Reactor (SMR) Development: Lessons from Northern and Indigenous Energy Projects(The Northern Review, 2024) Iakovleva, MariiaRemote 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.Item 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, HelenObjective: 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.Item Connecting hydrological modelling and forecasting from global to local scales: Perspectives from an international joint virtual workshop(Journal of Flood Risk Management, 2023) Dasgupta, Antara; Arnal, Louise; Emerton, Rebecca; Harrigan, Shaun; Matthews, Gwyneth; Muhammad, Ameer; O'Regan, Karen; Pérez-Ciria, Teresa; Valdez, Emixi; van Osnabrugge, Bart; Werner, Micha; Buontempo, Carlo; Cloke, Hannah; Pappenberger, Florian; Pechlivanidis, Ilias G; Prudhomme, Christel; Maria-Helena, Ramos; Salamon, PeterThe unprecedented progress in ensemble hydro-meteorological modelling and forecasting on a range of temporal and spatial scales, raises a variety of new challenges which formed the theme of the Joint Virtual Workshop, ‘Connecting global to local hydrological modelling and forecasting: challenges and scientific advances’. Held from 29 June to 1 July 2021, this workshop was co-organised by the European Centre for Medium-Range Weather Forecasts (ECMWF), the Copernicus Emergency Management (CEMS) and Climate Change (C3S) Services, the Hydrological Ensemble Prediction EXperiment (HEPEX), and the Global Flood Partnership (GFP). This article aims to summarise the state-of-the-art presented at the workshop and provide an early career perspective. Recent advances in hydrological modelling and forecasting, reflections on the use of forecasts for decision-making across scales, and means to minimise new barriers to communication in the virtual format are also discussed. Thematic foci of the workshop included hydrological model development and skill assessment, uncertainty communication, forecasts for early action, co-production of services and incorporation of local knowledge, Earth observation, and data assimilation. Connecting hydrological services to societal needs and local decision-making through effective communication, capacity-building and co-production was identified as critical. Multidisciplinary collaborations emerged as crucial to effectively bring newly developed tools to practice.Item Continental-scale nutrient and contaminant delivery by Pacific salmon(Nature, 2024-10-09) Brandt, Jessica E.; Wesner, Jeff F.; Ruggerone, Gregory; Jardine, Timothy D; Eagles-Smith, Collin A.; Ruso, Gabrielle E.; Stricker, Craig A.; Voss, Kristofor A.; Walters, David M.The movement of large amounts of nutrients by migrating animals has ecological benefits for recipient food webs that may be offset by co-transported contaminants. Salmon spawning migrations are archetypal of this process, carrying marine-derived materials to inland ecosystems where they stimulate local productivity but also enhance contaminant exposure. Pacific salmon abundance and biomass are higher now than in the last century, reflecting substantial shifts in community structure8 that probably altered nutrient versus contaminant delivery. Here we combined nutrient and contaminant concentrations with 40 years of annual Pacific salmon returns to quantify how changes in community structure influenced marine to freshwater inputs to western North America. Salmon transported tonnes of nutrients and kilograms of contaminants to freshwaters annually. Higher salmon returns (1976–2015) increased salmon-derived nutrient and contaminant inputs by 30% and 20%, respectively. These increases were dominated by pink salmon, which are short-lived, feed lower in marine food webs than other salmon species, and had the highest nutrient-to-contaminant ratios. As a result, the delivery of nutrients increased at a greater rate than the delivery of contaminants, and salmon inputs became more ecologically beneficial over time. Even still, contaminant loadings may represent exposure concerns for some salmon predators. The Pacific salmon example demonstrates how long-term environmental changes interact with nutrient and contaminant movement across large spatial scales and provides a model for exploring similar patterns with other migratory species.Item Development of an ice-jam flood forecasting modelling framework for freeze-up/winter breakup(IWA Publishing, 2023) Das, Apurba; Budhathoki, Sujata; Lindenschmidt, Karl-ErichRiver ice-jams can create severe flooding along many rivers in cold regions. While ice-jams often form during the spring breakup, the midwinter breakup can cause ice-jamming and flooding. Although many studies have already been focused on forecasting spring ice-jam flooding, studies related to forecasting mid-winter breakup jamming and flooding severity are sparse. The main purpose of this research is to develop a stochastic framework to forecast the severity of mid-winter ice-jam flooding along the transborder (New Brunswick/Maine) Saint John River of North America. A combination of hydrological (MESH) and hydraulic model (RIVICE) simulations was applied to develop the stochastic framework. A mid-winter breakup along the river that occurred in 2018 has been hindcasted as a case study. The result shows that the modelling framework can capture the real-time ice-jam severity. The results of this research will help to improve the capacity of ice-jam flood management in cold regions.Item Dietary shifts may underpin the recovery of a large carnivore population(Biology Letters, 2022) Campbell, Mariana A.; Udyawer, Vinay; Jardine, Timothy; Fukuda, Yusuke; Kopf, R. Keller; Bunn, Stuart; Campbell, HamishSupporting the recovery of large carnivores is a popular yet challenging endeavour. Estuarine crocodiles in Australia are a large carnivore conservation success story, with the population having extensively recovered from past heavy exploitation. Here, we explored if dietary changes had accompanied this large population recovery by comparing the isotopes δ13C and δ15N in bones of crocodiles sampled 40 to 55 years ago (small population) with bones from contemporary individuals (large population). We found that δ13C and δ15N values were significantly lower in contemporary crocodiles than in the historical cohort, inferring a shift in prey preference away from marine and into terrestrial food webs. We propose that an increase in intraspecific competition within the recovering crocodile population, alongside an increased abundance of feral ungulates occupying the floodplains, may have resulted in the crocodile population shifting to feed predominantly upon terrestrial food sources. The number of feral pigs consumed to sustain and grow crocodile biomass may help suppress pig population growth and increase the flow of terrestrially derived nutrients into aquatic ecosystems. The study highlights the significance of prey availability in contributing to large carnivore population recovery.Item Differential Controls of Greenhouse Gas (CO2, CH4, and N2O) Concentrations in Natural and Constructed Agricultural Waterbodies on the Northern Great Plains(American Geophysical Union (Client Organisation), Wiley (Commercial Publisher), 2023) Jensen, Sydney; Webb, Jackie; Simpson, Gavin; Baulch, Helen; Leavitt, Peter; Finlay, KerriInland waters are hotspots of greenhouse gas (GHG) cycling, with small water bodies particularly active in the production and consumption of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). However, wetland ponds are being replaced rapidly by small constructed reservoirs in agricultural regions, yet it is unclear whether these two water body types exhibit similar physical, chemical, and environmental controls of GHG content and fluxes. Here, we compared the content and regulatory mechanisms of all three major GHGs in 20 pairs of natural wetland ponds and constructed reservoirs in Canada's largest agricultural region. Carbon dioxide content was associated primarily with metabolic indicators in both water body types; however, primary production was paramount in reservoirs, and heterotrophic metabolism a stronger correlate in wetland ponds. Methane concentrations were correlated positively with eutrophication of the reservoirs alone, while competitive inhibition by sulfur-reducing bacteria may have limited CH4 in both waterbody types. Contrary to expectations, N2O was undersaturated in both water body types, with wetlands being a significantly stronger and more widespread N2O sink. Varying regulatory processes are attributed to differences in age, depth, morphology, and water-column circulation between water body types. These results suggest that natural and constructed water bodies should be modeled separately in regional GHG budgets.Item Ecotoxicity of NSO-heterocycles (NSO-HET) and short-chained alkyl phenols (SCAP) commonly detected in contaminated groundwater(Society of Environmental Toxicology and Chemistry, 2019) Brinkmann, Markus; Schneider, Anna-Lena; Bluhm, Kerstin; Schiwy, Sabrina; Lehmann, Gunnar; Deutschmann, Björn; Müller, Axel; Tiehm, Andreas; Hollert, HennerNitrogen, sulfur, or oxygen heterocyclic aromatic hydrocarbons (NSO-HETs) and short-chained alkyl phenols (SCAPs) are commonly detected in groundwater at contaminated sites and in the surrounding environment. It is now scientific consensus that these chemicals pose a risk to human and ecosystem health. However, toxicity data are comparably fragmentary, and only few studies have addressed the ecotoxicity of NSO-HETs and SCAPs in a systematic and comparative fashion. To overcome this shortcoming, we tested 18 SCAPs, 16 NSO-HETs, as well as the homocyclic hydrocarbons indane and indene in the Microtox® assay with Aliivibrio fischeri, the growth inhibition test with Desmodesmus subspicatus, the acute immobilization assay with Daphnia magna, as well as the fish embryo toxicity test with embryos of the zebrafish (Danio rerio). Because of the physicochemical properties of the tested chemicals (limited water solubility, volatility, and sorption to test vessels), actual exposure concentrations in test media and their dissipation over time were analytically quantified by means of gas chromatography with mass spectrometry. Analytically corrected effect levels (median effect and lethal concentrations) ranged from 0.017 to 180 mg L–1, underlining the environmental relevance of some NSO-HETs and SCAPs. Para-substituted phenols showed the overall greatest toxicities in all 4 toxicity tests. We provide, for the first time, a complete high-quality data set in support of better environmental risk assessments of these chemicals.Item Effects of ontogeny and invasive crayfish on feeding ecology and mercury concentrations of predatory fishes.(2019) Prestie, Kate; Phillips, Iain; Chivers, Doug; Jardine, TimItem Evaluating innovation in transdisciplinary sustainability education: TRANSECTS’ international learning labs(MedPharm Publications, 2024-09-26) Rosenberg, Eureta; Cockburn, Jessica; Reed, Maureen; James, Wendy; Gengelbach, Jana; Walk, HeikeEvaluative research can advance sustainability education through the learning it can enable, at micro and systems levels. This proposition is explored by examining evaluation practice in a 6-year international programme entitled Transdisciplinary Education Collaboration for Transformations in Sustainability involving universities and biosphere reserves/regions in Germany, South Africa and Canada. A Transdisciplinary International Learning Lab (TILL) was evaluated using a theory-based evaluation approach and interviews, focus groups and questionnaires that yielded qualitative data. Through meta-reflection, we concluded that our TILL had elements of a Field School, rather than a Learning Lab, and that our curriculum required more explicit deliberation among programme developers and implementers towards a deeper and shared understanding of pedagogical assumptions and more congruent practice of transdisciplinary and transformative sustainability education. The reflective, theory-based approach enabled learning from evaluation and was captured in a shared refinement of the theory of change, which makes it explicit that learning from pedagogical innovations is not only for students but also for academics. The paper is an invitation to other innovators in sustainability science, education and evaluation in higher education, to share related findings.
- «
- 1 (current)
- 2
- 3
- »