A5053572535- Mercury impact and mitigation studies
- Heavy Metal Exposure and Toxicity
- Toxic Organic Pollutants Impact
- Environmental Toxicology and Ecotoxicology
- Heavy metals in environment
- Fish Ecology and Management Studies
- Marine animal studies overview
- Isotope Analysis in Ecology
- Air Quality and Health Impacts
- Reproductive biology and impacts on aquatic species
- Identification and Quantification in Food
- Environmental DNA in Biodiversity Studies
- Hydrology and Watershed Management Studies
- Geology and Paleoclimatology Research
- Coal and Its By-products
- Marine and coastal ecosystems
- Mining and Resource Management
- Aquatic Ecosystems and Phytoplankton Dynamics
- Petroleum Processing and Analysis
- Per- and polyfluoroalkyl substances research
- Soil and Water Nutrient Dynamics
- Soil erosion and sediment transport
- Computer Graphics and Visualization Techniques
- Groundwater and Isotope Geochemistry
- Geochemistry and Elemental Analysis
Government of Alberta
2018-2024
University of Calgary
2022-2024
Teck (Canada)
2024
Alberta Environment and Protected Areas
2017-2021
Institut National de la Recherche Scientifique
2011-2021
University of Michigan
2015-2019
University of Michigan Biological Station
2015-2019
Michigan Department of Natural Resources
2016-2017
Miami University
2006-2016
Woods Hole Oceanographic Institution
2007-2010
Since the last Arctic Monitoring and Assessment Programme (AMAP) effort to review biological effects of exposure organohalogen compounds (OHCs) in biota, there has been a considerable number new effect studies. Here, we provide an update on state knowledge OHC, also include mercury, and/or associated key marine terrestrial mammal bird species as well fish by reviewing literature published since AMAP assessment 2010. We aimed at updating how single but combined health are or can be mixtures...
Abstract An important provision of the Minamata Convention on Mercury is to monitor and evaluate effectiveness adopted measures its implementation. Here, we describe for first time currently available biotic mercury (Hg) data a global scale improve understanding efforts reduce impact Hg pollution people environment. Data from peer-reviewed literature were compiled in Global Biotic Synthesis (GBMS) database (>550,000 points). These provide foundation establishing biomonitoring framework...
Recent laboratory studies have demonstrated that environmentally realistic concentrations of dietary methylmercury can impair reproduction fish. To evaluate relations between reproductive success and biomarkers exposure, we fed juvenile fathead minnows (Pimephales promelas) one three diets contaminated with methylmercury: 0.06 (control), 0.87 (low), 3.93 (medium) μg Hg g-1 dry weight. At sexual maturity, fish were paired, allowed to reproduce, then analyzed for total mercury, plasma...
Threshold concentrations associated with adverse effects of dietary exposure to methylmercury (MeHg) were derived from published results laboratory studies on a variety fish species. Adverse related mortality uncommon, whereas growth occurred only at MeHg exceeding 2.5 µg g(-1) wet weight. behavior had wide range effective concentrations, but generally above 0.5 In contrast, reproduction and other subclinical endpoints that much lower (<0.2 wt). Field lack information exposure, yet available...
Human activities over the last several centuries have transferred vast quantities of mercury (Hg) from deep geologic stores to actively cycling earth-surface reservoirs, increasing atmospheric Hg deposition worldwide. Understanding magnitude and fate these releases is critical predicting how rates will respond future emission reductions. The most recently compiled global inventories integrated (all-time) anthropogenic are dominated by emissions preindustrial gold/silver mining in Americas....
Abstract Mercury is a toxic trace metal that can accumulate to levels threaten human and environmental health. Models empirical data suggest humans are responsible for great deal of the mercury actively cycling in environment at present. Thus, one might predict concentration fish should have increased dramatically since Industrial Revolution. Evidence support this hypothesis has been hard find, however, some studies suggested analyses show no change concentration. By compiling re‐analyzing...
Mountaintop removal coal mining leaves a legacy of disturbed landscapes and abandoned infrastructure with clear impacts on water resources; however, the intensity persistence this pollution remains poorly characterized. Here we examined downstream over century in Crowsnest Pass (Alberta, Canada). Water samples were collected two historical mines: Tent Mountain Grassy Mountain. hosts partially reclaimed surface mine that closed 1983. Selenium concentrations reached 185 μg/L lake below spoil...
Mercury contamination of fish is a global problem. Consumption contaminated the primary route methylmercury exposure in humans and detrimental to health. Newly mandated reductions anthropogenic mercury emissions aim reduce atmospheric deposition thus concentrations fish. However, factors other than are important for bioaccumulation In lakes Isle Royale, U.S.A., reduced rates sulfate since Clean Air Act 1970 have caused decline levels that safe human consumption, even without discernible...
Methylmercury (MeHg) is a known neurotoxic agent, but the mechanisms by which MeHg may act on reproductive pathways are relatively unknown. Several studies have indicated potential changes in hormone levels as well declines vertebrates with increasing dietary exposure.The purpose of this study was to identify alterations gene expression associated exposure, specifically those previously observed reproduction and biomarkers. Fathead minnows, Pimephales promelas, were fed one three diets that...
Mercury (Hg) is a ubiquitous environmental contaminant and potent neurotoxin. In aquatic environments, Hg can be transformed into methylmercury (MeHg), which bioaccumulates in food webs, including fish. Methylmercury has been shown to transfer from female fish developing eggs; however, relatively little known regarding the effects of maternally transferred MeHg on embryos. The present study evaluated fathead minnow (Pimephales promelas) Embryos were collected adult fatheads exposed for 30 d...
Abstract Melano‐macrophage aggregates, collections of specialized cells the innate immune system fish, are considered a general biomarker for contaminant toxicity. To elucidate further relationship between macrophage aggregates and metals exposure, yelloweye rockfish ( Sebastes ruberrimus ), long‐lived species, were sampled from east west coasts Prince Wales Island, Alaska. Metals concentrations in livers (inorganic Hg, methyl mercury, Se, Ni, Cd, Cu, Zn) spleens Hg mercury) determined, as...
Lead and mercury have long histories of anthropogenic use release to the environment extending into preindustrial times. Yet, timing, magnitude, persistence emissions remain enigmatic, especially for mercury. Here, we quantify tropical lead deposition over past ∼3000 years using a well-dated sediment core from small crater lake (Lake Antoine, Grenada). Preindustrial increases in concentrations can be explained by varying inputs watershed mineral organic matter, which turn reflect...
Lake sediment serves as a natural archive of historical biological information. The use sedimentary DNA (sedDNA), form environmental (eDNA) shed by aquatic organisms and preserved in sediment, has been instrumental reconstructing past faunal composition communities. However, the low abundance fish sedDNA often humic-rich nature lake sediments create methodological challenges for accurate detection target using quantitative polymerase chain reaction (qPCR)-based approaches. Herein, we present...
This study describes the use of a 15 000 gene microarray developed for toxicological model species, Pimephales promelas , in investigating impact acute and chronic methylmercury exposures male gonad liver tissues. The results show significant differences individual genes that were differentially expressed response to each treatment. In liver, total 650 exhibited significantly ( P < 0·05) altered expression with greater than two‐fold from controls exposure 267 exposure. A majority these...
Mercury (Hg) contamination is a global issue with implications for both ecosystem and human health. In this study, we use new approach to link Hg exposure health effects in spotted gar (Lepisosteus oculatus) from Caddo Lake (TX/LA). Previous field studies have reported elevated incidences of macrophage centers liver, kidney, spleen fish high concentrations Hg. Macrophage are aggregates specialized white blood cells that form as an immune response tissue damage, considered general biomarker...
Few studies have investigated the effects of mercury (Hg) on wild fish from remote areas, even though these can high total Hg concentrations. In Kejimkujik National Park and Historic Site (KNPNHS), Nova Scotia, Canada, concentrations in many yellow perch (Perca flavescens) currently exceed estimated threshold level for adverse (0.2 µg g(-1) (wet wt), whole body). To determine whether exposure is adversely affecting general health fish, authors collected male female fall 2009 2010 12 lakes...
Knowledge of Hg speciation in tissue is valuable for assessing potential toxicological effects fish. Direct analyzers, which use thermal decomposition and atomic absorption spectrometry, have recently gained popularity determining organic after procedural solvent extraction from some environmental media, although quantitative recovery lipid-rich materials, such as fish liver, has been problematic. The authors developed a new method by liver muscle estimated the difference between direct...