Karen R Murray, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 38
Design and methods of the U.S. Geological Survey Northeast Stream Quality Assessment (NESQA), 2016 Design and methods of the U.S. Geological Survey Northeast Stream Quality Assessment (NESQA), 2016
During 2016, as part of the National Water-Quality Assessment Project (NAWQA), the U.S. Geological Survey conducted the Northeast Stream Quality Assessment (NESQA) to investigate stream quality in the northeastern United States. The goal of the NESQA was to assess the health of wadeable streams in the region by characterizing multiple water-quality factors that are stressors to aquatic...
Authors
James F. Coles, Karen Riva-Murray, Peter C. Van Metre, Daniel T. Button, Amanda H. Bell, Sharon L. Qi, Celeste A. Journey, Rich W. Sheibley
Response of mercury in an Adirondack (NY, USA) forest stream to watershed lime application Response of mercury in an Adirondack (NY, USA) forest stream to watershed lime application
Surface waters in Europe and North America previously impacted by acid deposition are recovering in conjunction with declining precursor emissions since the 1980s. Lime has been applied to some impacted watersheds to accelerate recovery. The response to liming can be considered a proxy for future recovery from acid deposition. Increases in dissolved organic carbon concentrations have...
Authors
Geoffrey D. Millard, Charles T. Driscoll, Douglas A. Burns, Mario R. Montesdeoca, Karen Riva-Murray
Variation in fish mercury concentrations in streams of the Adirondack region, New York: A simplified screening approach using chemical metrics Variation in fish mercury concentrations in streams of the Adirondack region, New York: A simplified screening approach using chemical metrics
Simple screening approaches for the neurotoxicant methylmercury (MeHg) in aquatic ecosystems may be helpful in risk assessments of natural resources. We explored the development of such an approach in the Adirondack Mountains of New York, USA, a region with high levels of MeHg bioaccumulation. Thirty-six perennial streams broadly representative of 1st and 2nd order streams in the region...
Authors
Douglas A. Burns, Karen Riva-Murray
A new look at liming as an approach to accelerate recovery from acidic deposition effects A new look at liming as an approach to accelerate recovery from acidic deposition effects
Acidic deposition caused by fossil fuel combustion has degraded aquatic and terrestrial ecosystems in North America for over four decades. The only management option other than emissions reductions for combating the effects of acidic deposition has been the application of lime to neutralize acidity after it has been deposited on the landscape. For this reason, liming has been a part of...
Authors
Gregory B. Lawrence, Douglas A. Burns, Karen Riva-Murray
The Northeast Stream Quality Assessment The Northeast Stream Quality Assessment
In 2016, the U.S. Geological Survey (USGS) National Water-Quality Assessment (NAWQA) is assessing stream quality in the northeastern United States. The goal of the Northeast Stream Quality Assessment (NESQA) is to assess the quality of streams in the region by characterizing multiple water-quality factors that are stressors to aquatic life and evaluating the relation between these...
Authors
Peter C. Van Metre, Karen Riva-Murray, James F. Coles
Hydraulic and biochemical gradients limit wetland mercury supply to an Adirondack stream Hydraulic and biochemical gradients limit wetland mercury supply to an Adirondack stream
Net fluxes (change between upstream and downstream margins) for water, methylmercury (MeHg), total mercury (THg), dissolved organic carbon (DOC), and chloride (Cl) were assessed twice in an Adirondack stream reach (Sixmile Brook, USA), to test the hypothesized importance of wetland-stream hydraulic and chemical gradients as fundamental controls on fluvial mercury (Hg) supply. The 500 m...
Authors
Paul M. Bradley, Douglas A. Burns, Judson Harvey, Celeste A. Journey, Mark E. Brigham, Karen Riva-Murray
Science and Products
Filter Total Items: 38
Design and methods of the U.S. Geological Survey Northeast Stream Quality Assessment (NESQA), 2016 Design and methods of the U.S. Geological Survey Northeast Stream Quality Assessment (NESQA), 2016
During 2016, as part of the National Water-Quality Assessment Project (NAWQA), the U.S. Geological Survey conducted the Northeast Stream Quality Assessment (NESQA) to investigate stream quality in the northeastern United States. The goal of the NESQA was to assess the health of wadeable streams in the region by characterizing multiple water-quality factors that are stressors to aquatic...
Authors
James F. Coles, Karen Riva-Murray, Peter C. Van Metre, Daniel T. Button, Amanda H. Bell, Sharon L. Qi, Celeste A. Journey, Rich W. Sheibley
Response of mercury in an Adirondack (NY, USA) forest stream to watershed lime application Response of mercury in an Adirondack (NY, USA) forest stream to watershed lime application
Surface waters in Europe and North America previously impacted by acid deposition are recovering in conjunction with declining precursor emissions since the 1980s. Lime has been applied to some impacted watersheds to accelerate recovery. The response to liming can be considered a proxy for future recovery from acid deposition. Increases in dissolved organic carbon concentrations have...
Authors
Geoffrey D. Millard, Charles T. Driscoll, Douglas A. Burns, Mario R. Montesdeoca, Karen Riva-Murray
Variation in fish mercury concentrations in streams of the Adirondack region, New York: A simplified screening approach using chemical metrics Variation in fish mercury concentrations in streams of the Adirondack region, New York: A simplified screening approach using chemical metrics
Simple screening approaches for the neurotoxicant methylmercury (MeHg) in aquatic ecosystems may be helpful in risk assessments of natural resources. We explored the development of such an approach in the Adirondack Mountains of New York, USA, a region with high levels of MeHg bioaccumulation. Thirty-six perennial streams broadly representative of 1st and 2nd order streams in the region...
Authors
Douglas A. Burns, Karen Riva-Murray
A new look at liming as an approach to accelerate recovery from acidic deposition effects A new look at liming as an approach to accelerate recovery from acidic deposition effects
Acidic deposition caused by fossil fuel combustion has degraded aquatic and terrestrial ecosystems in North America for over four decades. The only management option other than emissions reductions for combating the effects of acidic deposition has been the application of lime to neutralize acidity after it has been deposited on the landscape. For this reason, liming has been a part of...
Authors
Gregory B. Lawrence, Douglas A. Burns, Karen Riva-Murray
The Northeast Stream Quality Assessment The Northeast Stream Quality Assessment
In 2016, the U.S. Geological Survey (USGS) National Water-Quality Assessment (NAWQA) is assessing stream quality in the northeastern United States. The goal of the Northeast Stream Quality Assessment (NESQA) is to assess the quality of streams in the region by characterizing multiple water-quality factors that are stressors to aquatic life and evaluating the relation between these...
Authors
Peter C. Van Metre, Karen Riva-Murray, James F. Coles
Hydraulic and biochemical gradients limit wetland mercury supply to an Adirondack stream Hydraulic and biochemical gradients limit wetland mercury supply to an Adirondack stream
Net fluxes (change between upstream and downstream margins) for water, methylmercury (MeHg), total mercury (THg), dissolved organic carbon (DOC), and chloride (Cl) were assessed twice in an Adirondack stream reach (Sixmile Brook, USA), to test the hypothesized importance of wetland-stream hydraulic and chemical gradients as fundamental controls on fluvial mercury (Hg) supply. The 500 m...
Authors
Paul M. Bradley, Douglas A. Burns, Judson Harvey, Celeste A. Journey, Mark E. Brigham, Karen Riva-Murray