Browsing Faculté des arts et des sciences – Département de sciences biologiques by Author "Amyot, Marc"
Now showing items 1-20 of 20
-
Cooking and co-ingested polyphenols reduce in vitro methylmercury bioaccessibility from fish and may alter exposure in humans
MeHg bioaccessibility is reduced by food preparation
Girard, Catherine; Charette, Tania; Leclerc, Maxime; Shapiro, Jesse; Amyot, Marc (Elsevier, 2017-10-31)Fish consumption is a major pathway for mercury exposure in humans. Current guidelines and risk assessments assume that 100% of methylmercury (MeHg) in fish is absorbed by the human body after ingestion. However, a growing body of literature suggests ... -
Differential effects of plant root systems on nickel, copper and silver bioavailability in contaminated soil
Nguyen, Thi Xuan Trang; Amyot, Marc; Labrecque, Michel (2017-02-28)A pot experiment was conducted to investigate the effect of diverse plant species (four herbaceous and four woody species) on the labile pool of six metals (Ag, Cu, Pd, Zn, Ni and Se) present in their rhizosphere. After three months of cultivation, ... -
An ecological microsystem to treat waste oil contaminated soil: Using phytoremediation assisted by fungi and local compost, on a mixed-contaminant site, in a cold climate
Robichaud, Kawina; Stewart, Katherine; Labrecque, Michel; Hijri, Mohamed; Cherewyk, Jensen; Amyot, Marc (Elsevier, 2019-03-29)As a result of anthropization and industrialization, northern remote communities face issues of soil contamination by mixtures of organic and inorganic contaminants. Soil bioremediation in cold environments is particularly challenging because of slower ... -
Effects of experimental thermocline and oxycline deepening on methylmercury bioaccumulation in a Canadian Shield lake
Perron, Tania; Chételat, John; Gunn, John; Beisner, Beatrix; Amyot, Marc (American Chemical Society, 2014-02-10)Environmental disturbances like deforestation or climate change may influence lake thermal and oxic stratification, thereby modifying cycles of contaminants such as mercury (Hg). In a lake naturally separated into three basins, the thermocline and ... -
Environmental drivers of rare earth element bioaccumulation in freshwater zooplankton
MacMillan, Gwyneth A.; Clayden, Meredith G.; Chételat, John; Richardson, Murray C.; Ponton, Dominic; Perron, Tania; Amyot, Marc (American Chemical Society, 2018-12-26)Human activities have resulted in significant release of rare earth elements (REEs) into the environment. However, the pathways of REEs from waters and soils into freshwater food webs remain poorly understood. Recent studies suggest that aquatic ... -
Fate and trophic transfer of rare earth elements in temperate lake food webs
Amyot, Marc; Clayden, Meredith G.; MacMillan, Gwyneth A.; Perron, Tania; Arscott-Gauvin, Alexandre (2017-05-05)Many mining projects targeting rare earth elements (REE) are in development in North America, but the background concentrations and trophic transfer of these elements in natural environments have not been well characterized. We sampled abiotic and food ... -
The fish or the egg : maternal transfer and subcellular partitioning of mercury and selenium in Yellow Perch (Perca flavescens)
Khadra, Mélissa; Caron, Antoine; Planas, Dolors; Ponton, Dominic; Rosabal, Maikel; Amyot, Marc (Elsevier, 2019-04-17)Mercury (Hg) is a trace element of particular concern since it is ubiquitous in the environment and because its methylated form (MeHg) readily bioaccumulates and biomagnifies in food webs. This latter process leads to elevated Hg concentrations in fish ... -
Freshwater sample preservation for the analysis of dissolved low molecular mass thiols
Leclerc, Maxime; Planas, Dolors; Amyot, Marc (Wiley, 2017)Low molecular mass (LMM) thiols are ubiquitous organosulfur peptides that play key roles in biogeochemical element cycling. These LMM thiols, found at low concentrations in the water column, are highly sensitive to oxidation and degradation processes ... -
High methylmercury in Arctic and subarctic ponds is related to nutrient levels in the warming eastern Canadian Arctic
MacMillan, Gwyneth A.; Girard, Catherine; Chételat, John; Laurion, Isabelle; Amyot, Marc (2015-06)Permafrost thaw ponds are ubiquitous in the eastern Canadian Arctic, yet little information exists on their potential as sources of methylmercury (MeHg) to freshwaters. They are microbially active and conducive to methylation of inorganic mercury, ... -
Local fungi, willow and municipal compost effectively remediate petroleum-contaminated soil in the Canadian North
Robichaud, Kawina; Girard, Catherine; Dagher, Dimitri; Stewart, Katherine; Labrecque, Michel; Hijri, Mohamed; Amyot, Marc (Elsevier, 2018-12-15)Low energy-input alternatives based on locally available products are needed for treating petroleum-hydrocarbon spills in northern regions. We tested the efficacy of three local biological components (municipal compost, white-rot fungus: Pleurotus ... -
Mapping metal (Hg, As, Se), lipid and protein levels within fish muscular system in two fish species (Striped Bass and Northern Pike)
Charette, Tania; Rosabal, Maikel; Amyot, Marc (Elsevier, 2020-11-19)Current guidelines tend to limitfish consumption based on mercury (Hg) or monomethylmercury(MeHg) content infishflesh, without considering the presence of antagonist chemical elements thatcould modulate Hg toxicity. However, it is difficult to assess ... -
Mercury and selenium distribution in key tissues and early life stages of Yellow Perch (Perca flavescens)
Khadra, Mélissa; Planas, Dolors; Brodeur, Philippe; Amyot, Marc (Elsevier, 2019-07-26)Whereas early life stages are usually considered as particularly sensitive to both organic and inorganic contaminants, field studies assessing contaminant bioaccumulation in these stages are scarce. Selenium (Se) is thought to counteract Hg toxic effects ... -
Mercury, hydroquinone and clobetasol propionate in skin lightening products in West Africa and Canada
Gbetoh, Mètogbé Honoré; Amyot, Marc (2016-10-31)Skin lightening products are types of cosmetics (creams, gels, lotions and soaps) applied voluntarily on skin. Several of these products contain a variety of active ingredients that are highly toxic. Among those toxic agents, the present study focuses ... -
Mobilization and transformation of mercury across a dammed boreal river are linked to carbon processing and hydrology
de Bonville, Jérémy; Amyot, Marc; del Giorgio, Paul; Tremblay, Alain; Bilodeau, François; Ponton, Dominic; Lapierre, Jean‐François (Wiley, 2020-09-22)Reservoirs are known to accelerate the mobilization and cycling of mercury and carbon as aresult of flooding of terrestrial organic matter, which can lead to environmental concerns at local andbroader spatial scales. We explored the covariation of ... -
Photodemethylation of methylmercury in Eastern Canadian Arctic thaw pond and lake ecosystems
Girard, Catherine; Leclerc, Maxime; Amyot, Marc (2016-04-05)Permafrost thaw ponds of the warming Eastern Canadian Arctic are major landscape constituents and often display high levels of methylmercury (MeHg). We examined photodegradation potentials in high-dissolved organic matter (DOC) thaw ponds on Bylot ... -
Relationship between extracellular low-molecular-weight thiols and mercury species in natural lake periphytic biofilms
Leclerc, Maxime; Planas, Dolors; Amyot, Marc (American chemical Society, 2015-05-26)The uptake of mercury by microorganisms is a key step in the production of methylmercury, a biomagnifiable toxin. Mercury complexation by low molecular weight (LMW) thiols can affect its bioavailability and thus the production of methylmercury. Freshwater ... -
Role of organic matter and microbial communities in mercury retention and methylation in sediments near run-of-river hydroelectric dams
Millera Ferriz, Lise; Ponton, Dominic; Storck, Veronika; Bilodeau, François; Walsh, David; Leclerc, Maxime; Amyot, Marc (Elsevier, 2021-02-06)Run-of-river power plants (RoRs) are expected to triple in number over the next decades in Canada. These struc-tures are not anticipated to considerably promote the mobilization and transport of mercury (Hg) and its subse-quent microbial transformation ... -
Role of prey subcellular distribution on the bioaccumulation of yttrium (Y) in the rainbow trout
Cardon, Pierre-Yves; Roques, Olivier; Caron, Antoine; Rosabal, Maikel; Fortin, Claude; Amyot, Marc (Elsevier, 2019-12-13)Our knowledge of the processes leading to the bioaccumulation of rare earth elements (REE) in aquatic biota is limited. As the contamination of freshwater ecosystems by anthropogenic REE have recently been reported, it becomes increasingly urgent to ... -
Toxicity and subcellular fractionation of yttrium in three freshwater organisms : Daphnia magna, Chironomus riparius and Oncorhynchus mykiss
Cardon, Pierre-Yves; Triffault-Bouchet, Gaëlle; Caron, Antoine; Rosabal, Maikel; Fortin, Claude; Amyot, Marc (American Chemical Society, 2019-08-15)The demand for rare earth elements (REEs) has increased since the 1990s leading to the development of many mining projects worldwide. However, less is known about how organisms can handle these metals in natural aquatic systems. Through laboratory ... -
Understanding food web mercury accumulation through trophic transfer and carbon processing along a river affected by recent run-of-river dams
Ponton, Dominic; Lavoie, Raphaël; Leclerc, Maxime; Bilodeau, François; Planas, Dolors; Amyot, Marc (2021-02-03)Unlike large dams which favor methylation of Hg in flooded soils over long periods, run-of-river dams are designed to flood a limited area of soils and are therefore not expected to significantly affect mercury (Hg) cycling or carbon processing. We ...