Search Results - "LEAN, D. R. S"

Global Increases in Ultraviolet B Radiation: Potential Impacts on Amphibian Development and Metamorphosis by Croteau, M. C., Davidson, M. A., Lean, D. R. S., Trudeau, V. L.

“…Levels of ultraviolet B radiation (UVBR) reaching the Earth’s surface have increased since the 1970s as a result of stratospheric ozone depletion caused by the…”
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Temporal Trends and Spatial Variability of Mercury in Four Fish Species in the Ontario Segment of the St. Lawrence River, Canada by Goulet, Richard R, Lalonde, J. D, Chapleau, F, Findlay, S. C, Lean, D. R. S

“…The Massena (New York) and Cornwall (Ontario) region has a long history of Hg discharge into the St. Lawrence River. The objectives of this study were to…”
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Gross Photoreduction Kinetics of Mercury in Temperate Freshwater Lakes and Rivers:  Application to a General Model of DGM Dynamics by O'Driscoll, N. J, Siciliano, S. D, Lean, D. R. S, Amyot, M

“…Previous published measurements of mercury photoreduction are for net-photoreduction, since photooxidation processes occur simultaneously. In this research we…”
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Using the INCA-Hg model of mercury cycling to simulate total and methyl mercury concentrations in forest streams and catchments by Futter, M.N., Poste, A.E., Butterfield, D., Dillon, P.J., Whitehead, P.G., Dastoor, A.P., Lean, D.R.S.

“…We present a new, catchment-scale, process-based dynamic model for simulating mercury (Hg) in soils and surface waters. The Integrated Catchments Model for…”
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Microbial Reduction and Oxidation of Mercury in Freshwater Lakes by Siciliano, Steven D, O'Driscoll, Nelson J, Lean, D. R. S

“…The evasion of elemental mercury represents a significant pathway for reducing the level of this potentially toxic material in aquatic ecosystems. The evasion…”
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The influence of forestry activity on the structure of dissolved organic matter in lakes: Implications for mercury photoreactions by O'Driscoll, N.J., Siciliano, S.D., Peak, D., Carignan, R., Lean, D.R.S.

“…It is well known that dissolved organic matter (DOM) increases in lakes associated with forestry activity but characterization of the DOM structure is…”
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Effect of Dissolved Organic Carbon on the Photoproduction of Dissolved Gaseous Mercury in Lakes:  Potential Impacts of Forestry by O'Driscoll, N. J, Lean, D. R. S, Loseto, L. L, Carignan, R, Siciliano, S. D

“…The production of dissolved gaseous mercury (DGM) in freshwater lakes is induced by solar radiation and is also thought to be linked to processes mediated by…”
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Factors affecting methylmercury distribution in surficial, acidic, base-metal mine tailings by Winch, S., Praharaj, T., Fortin, D., Lean, D.R.S.

“…The most toxic form of Hg commonly of concern in the environment is methylmercury (MeHg), as it accumulates in living tissues and bioconcentrates in food webs…”
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Continuous Analysis of Dissolved Gaseous Mercury and Mercury Volatilization in the Upper St. Lawrence River:  Exploring Temporal Relationships and UV Attenuation by O'Driscoll, Poissant, Canário, Ridal, Lean, D. R. S

“…The formation and volatilization of dissolved gaseous mercury (DGM) is an important mechanism by which freshwaters may naturally reduce their mercury burden…”
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Dissolved Gaseous Mercury Concentrations and Mercury Volatilization in a Frozen Freshwater Fluvial Lake by O’Driscoll, N. J, Poissant, L, Canário, J, Lean, D. R. S

“…In situ mesocosm experiments were performed to examine dissolved gaseous mercury (DGM), mercury volatilization, and sediment interactions in a frozen…”
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Mercury empirical relationships in sediments from three Ontario lakes by Ethier, A.L.M., Scheuhammer, A.M., Blais, J.M., Paterson, A.M., Mierle, G., Ingram, R., Lean, D.R.S.

“…Total mercury (THg), methyl mercury (MeHg), total organic carbon (TOC), sediment bulk density (SBD), redox potential (Eh) and percent fines measurements were…”
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Assessment of thyroid system disruption in Rana pipiens tadpoles chronically exposed to UVB radiation and 4- tert-octylphenol by Croteau, M.C., Davidson, M., Duarte-Guterman, P., Wade, M., Popesku, J.T., Wiens, S., Lean, D.R.S., Trudeau, V.L.

“…Many studies have considered recent increases in ultraviolet B radiation (UVBR) and endocrine disrupting chemicals polluting the environment as possible…”
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Hydrogen Peroxide Formation: The Interaction of Ultraviolet Radiation and Dissolved Organic Carbon in Lake Waters Along a 43-75⚬N Gradient by Scully, N. M., McQueen, D. J., Lean, D. R. S., Cooper, W. J.

“…Hydrogen peroxide (H2O 2) formation rates (nM h-1), photoproductive capacity (nM W-1 h-1 m-2), and H2O2formation efficiency (φH2O2) were measured on water…”
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Investigation of pathogenic Escherichia coli and microbial pathogens in pulp and paper mill biosolids by Croteau, M. C., Renner, V. E., Archibald, F., Langlois, V. S., Cahn, J., Ridal, J., Trudeau, V. L., Lean, D. R. S.

“…Biosolids produced from pulp and paper mill wastewater treatment have excellent properties as soil conditioners, but often contain high levels of Escherichia…”
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Effects of Nutrients and Planktivorous Fish on the Phytoplankton of Shallow and Deep Aquatic Systems by Proulx, M., Pick, F. R., Mazumder, A., Hamilton, P. B., Lean, D. R. S.

“…The response of phytoplankton to nutrient (N, P) and planktivorous fish additions (Phoxinus sp.) was compared between two sets of enclosures (8 m in diameter)…”
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Effects of Fish and Plankton on Lake Temperature and Mixing Depth by Mazumder, A., Taylor, W. D., McQueen, D. J., Lean, D. R. S.

“…A comparative study of small temperate lakes ($<20$ square kilometers) indicates that the mixing depth or epilimnion is directly related to light penetration…”
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Potential causes of enhanced transfer of mercury to St. Lawrence River Biota: implications for sediment management strategies at Cornwall, Ontario, Canada by Ridal, J. J., Yanch, L. E., Fowlie, A. R., Razavi, N. R., Delongchamp, T. M., Choy, E. S., Fathi, M., Hodson, P. V., Campbell, L. M., Blais, J. M., Hickey, M. B. C., Yumvihoze, E., Lean, D. R. S.

“…We examined factors and pathways involved in the transfer of mercury (Hg) to the food web in St. Lawrence River embayments near Cornwall, Ontario, where…”
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Physical and chemical limnology of northern boreal lakes, Wood Buffalo National Park, northern Alberta and the Northwest Territories, Canada by MOSER, K. A, SMOL, J. P, LEAN, D. R. S, MACDONALD, G. M

“…Physical and chemical variables were measured in 35 lakes from Wood Buffalo National Park, northern Alberta and the Northwest Territories, Canada. Of these…”
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Continuous analysis of dissolved gaseous mercury in freshwater lakes by O'Driscoll, N.J., Siciliano, S.D., Lean, D.R.S.

“…The concentration of dissolved gaseous mercury (DGM) in freshwaters changes more quickly than the 40-min processing time of current analytical methods. A new…”
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The effects of ultraviolet-B radiation on freshwater ecosystems of the Arctic: Influence from stratospheric ozone depletion and climate change by Perin, S, Lean, D RS

“…Depletion of stratospheric ozone, the principal atmospheric attenuator of ultraviolet-B (UVB) radiation, by man-made chemicals has raised scientific and public…”
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