Voici les éléments 1-20 de 32
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Une addition à la flore du Québec : Monarda punctata var. villicaulis (Lamiaceae)
(Ottawa Field Naturalists Club, 1994)Une population de Monarde ponctuée (Monarda punctata var. villicaulis) fut trouvée pour la première fois au Québec, dans la région du Haut-Saint-Laurent. Cette population, qui comprend plus d’une centaine d’individus, déplace légèrement la limite ... -
Biodiversite microfongique du Fagus grandifolia dans une forêt ancienne : bioindicateurs et structure mycosociologique
(Ottawa Field Naturalists Club, 2001)En Amérique du Nord, l’étude de la biodiversité des micromycètes dans les forêts anciennes représente un potentiel incontournable et largement inexploré. Le présent inventaire nous a permis de mettre en évidence la biodiversité microfongique, ... -
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
(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
(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
(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 ... -
Edge effects on vegetation in rights-of-way
(Elsevier, 1997)As a result of an increasing use of ecological methods for the control of vegetation in rights-of-way, it has become necessary to understand the natural processes that are likely to facilitate or hinder management objectives. Several factors may ... -
Effects of experimental thermocline and oxycline deepening on methylmercury bioaccumulation in a Canadian Shield lake
(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
(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
(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)
(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 ... -
Forked Three-awned Grass, Aristida basiramea Engelm. ex Vasey : a new addition to the flora of Quebec
(Ottawa Field Naturalists Club, 2004)A population of Forked Three-awned Grass (Aristida basiramea Engelm. ex Vasey; Poaceae) was found for the first time in Quebec, on a sand barren of the Cazaville region (Haut-Saint-Laurent). The only other region where this species is known in Canada ... -
Freshwater sample preservation for the analysis of dissolved low molecular mass thiols
(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 ... -
The Haut-Saint-Laurent wilderness at the time of settlement based on Sellar’s History. Part I : Wildlife
(Société Historique de la Vallée de la Châteauguay = Chateauguay Valley Historical Society, 2004) -
The Haut-Saint-Laurent wilderness at the time of settlement based on Sellar’s History. Part II : Forests and wetlands.
(Société Historique de la Vallée de la Châteauguay = Chateauguay Valley Historical Society, 2006) -
High methylmercury in Arctic and subarctic ponds is related to nutrient levels in the warming eastern Canadian Arctic
(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, ... -
The history and tree stratum of an old-growth forest of Haut-Saint-Laurent region, Quebec
(Natural Areas Association, 1992)An old-growth forest of presettlement origin was recently discovered at the northern limit of the Eastern Deciduous Forest (sensu Braun 1950) of North America, in an area that is extensively affected by logging, land clearing, and agriculture. In a ... -
Increasing phytoremediation efficiency and reliability using novel omics approaches
(Cell Press, 2014-04-12)Phytoremediation is a cost-effective green alternative to traditional soil remediation technologies, but has experienced varied success in practice. The recent omics revolution has led to leaps in our understanding of soil microbial communities and ... -
The level of pollination specialization affects the relationship between the shape of flowers and the bills of their hummingbird pollinators in Antillean Gesneriaceae
(The University of Chicago Press, 2022-01-27)Premise of research. Pollinators are known to impose strong selection on floral shape. Particularly well studied is the relationship between the flowers of hummingbird-pollinated plant species and the bills of their pollinators. However, no studies to ... -
Local fungi, willow and municipal compost effectively remediate petroleum-contaminated soil in the Canadian North
(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)
(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 ...
