Karen R Murray, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 38
Intra- and inter-basin mercury comparisons: Importance of basin scale and time-weighted methylmercury estimates Intra- and inter-basin mercury comparisons: Importance of basin scale and time-weighted methylmercury estimates
To assess inter-comparability of fluvial mercury (Hg) observations at substantially different scales, Hg concentrations, yields, and bivariate-relations were evaluated at nested-basin locations in the Edisto River, South Carolina and Hudson River, New York. Differences between scales were observed for filtered methylmercury (FMeHg) in the Edisto (attributed to wetland coverage...
Authors
Paul M. Bradley, Celeste A. Journey, Mark E. Bringham, Douglas A. Burns, Daniel T. Button, Karen Riva-Murray
Mercury bioaccumulation studies in the National Water-Quality Assessment Program--biological data from New York and South Carolina, 2005-2009 Mercury bioaccumulation studies in the National Water-Quality Assessment Program--biological data from New York and South Carolina, 2005-2009
The U.S. Geological Survey National Water-Quality Assessment Program conducted a multidisciplinary study from 2005–09 to investigate the bioaccumulation of mercury in streams from two contrasting environmental settings. Study areas were located in the central Adirondack Mountains region of New York and the Inner Coastal Plain of South Carolina. Fish, macroinvertebrates, periphyton...
Authors
Karen M. Beaulieu, Daniel T. Button, Barbara C. Scudder Eikenberry, Karen Riva-Murray, Lia C. Chasar, Paul M. Bradley, Douglas A. Burns
Shallow groundwater mercury supply in a coastal plain stream Shallow groundwater mercury supply in a coastal plain stream
Fluvial methylmercury (MeHg) is attributed to methylation in up-gradient wetland areas. This hypothesis depends on efficient wetland-to-stream hydraulic transport under nonflood and flood conditions. Fluxes of water and dissolved (filtered) mercury (Hg) species (FMeHg and total Hg (FTHg)) were quantified in April and July of 2009 in a reach at McTier Creek, South Carolina to determine...
Authors
Paul M. Bradley, Celeste A. Journey, Mark A. Lowery, Mark E. Brigham, Douglas A. Burns, Daniel T. Button, Francis H. Chapelle, Michelle A. Lutz, Mark C. Marvin-DiPasquale, Karen Riva-Murray
Landscape controls on total and methyl Hg in the Upper Hudson River basin, New York, USA Landscape controls on total and methyl Hg in the Upper Hudson River basin, New York, USA
Approaches are needed to better predict spatial variation in riverine Hg concentrations across heterogeneous landscapes that include mountains, wetlands, and open waters. We applied multivariate linear regression to determine the landscape factors and chemical variables that best account for the spatial variation of total Hg (THg) and methyl Hg (MeHg) concentrations in 27 sub-basins...
Authors
Douglas A. Burns, K. Riva-Murray, P. M. Bradley, G. R. Aiken, M. E. Brigham
Spatial patterns of mercury in macroinvertebrates and fishes from streams of contrasting forested landscapes in the eastern United States Spatial patterns of mercury in macroinvertebrates and fishes from streams of contrasting forested landscapes in the eastern United States
Controls on mercury bioaccumulation in lotic ecosystems are not well understood. During 2007–2009, we studied mercury and stable isotope spatial patterns of macroinvertebrates and fishes from two medium-sized (
Authors
Karen Riva-Murray, Lia C. Chasar, Paul M. Bradley, Douglas A. Burns, Mark E. Brigham, Martyn J. Smith, Thomas A. Abrahamsen
Spatial and seasonal variability of dissolved methylmercury in two stream basins in the Eastern United States Spatial and seasonal variability of dissolved methylmercury in two stream basins in the Eastern United States
We assessed methylmercury (MeHg) concentrations across multiple ecological scales in the Edisto (South Carolina) and Upper Hudson (New York) River basins. Out-of-channel wetland/floodplain environments were primary sources of filtered MeHg (F-MeHg) to the stream habitat in both systems. Shallow, open-water areas in both basins exhibited low F-MeHg concentrations and decreasing F-MeHg...
Authors
Paul M. Bradley, Douglas A. Burns, Karen Riva-Murray, Mark E. Brigham, Daniel T. Button, Lia C. Chasar, Mark Marvin-DiPasquale, Mark A. Lowery, Celeste A. Journey
Science and Products
Filter Total Items: 38
Intra- and inter-basin mercury comparisons: Importance of basin scale and time-weighted methylmercury estimates Intra- and inter-basin mercury comparisons: Importance of basin scale and time-weighted methylmercury estimates
To assess inter-comparability of fluvial mercury (Hg) observations at substantially different scales, Hg concentrations, yields, and bivariate-relations were evaluated at nested-basin locations in the Edisto River, South Carolina and Hudson River, New York. Differences between scales were observed for filtered methylmercury (FMeHg) in the Edisto (attributed to wetland coverage...
Authors
Paul M. Bradley, Celeste A. Journey, Mark E. Bringham, Douglas A. Burns, Daniel T. Button, Karen Riva-Murray
Mercury bioaccumulation studies in the National Water-Quality Assessment Program--biological data from New York and South Carolina, 2005-2009 Mercury bioaccumulation studies in the National Water-Quality Assessment Program--biological data from New York and South Carolina, 2005-2009
The U.S. Geological Survey National Water-Quality Assessment Program conducted a multidisciplinary study from 2005–09 to investigate the bioaccumulation of mercury in streams from two contrasting environmental settings. Study areas were located in the central Adirondack Mountains region of New York and the Inner Coastal Plain of South Carolina. Fish, macroinvertebrates, periphyton...
Authors
Karen M. Beaulieu, Daniel T. Button, Barbara C. Scudder Eikenberry, Karen Riva-Murray, Lia C. Chasar, Paul M. Bradley, Douglas A. Burns
Shallow groundwater mercury supply in a coastal plain stream Shallow groundwater mercury supply in a coastal plain stream
Fluvial methylmercury (MeHg) is attributed to methylation in up-gradient wetland areas. This hypothesis depends on efficient wetland-to-stream hydraulic transport under nonflood and flood conditions. Fluxes of water and dissolved (filtered) mercury (Hg) species (FMeHg and total Hg (FTHg)) were quantified in April and July of 2009 in a reach at McTier Creek, South Carolina to determine...
Authors
Paul M. Bradley, Celeste A. Journey, Mark A. Lowery, Mark E. Brigham, Douglas A. Burns, Daniel T. Button, Francis H. Chapelle, Michelle A. Lutz, Mark C. Marvin-DiPasquale, Karen Riva-Murray
Landscape controls on total and methyl Hg in the Upper Hudson River basin, New York, USA Landscape controls on total and methyl Hg in the Upper Hudson River basin, New York, USA
Approaches are needed to better predict spatial variation in riverine Hg concentrations across heterogeneous landscapes that include mountains, wetlands, and open waters. We applied multivariate linear regression to determine the landscape factors and chemical variables that best account for the spatial variation of total Hg (THg) and methyl Hg (MeHg) concentrations in 27 sub-basins...
Authors
Douglas A. Burns, K. Riva-Murray, P. M. Bradley, G. R. Aiken, M. E. Brigham
Spatial patterns of mercury in macroinvertebrates and fishes from streams of contrasting forested landscapes in the eastern United States Spatial patterns of mercury in macroinvertebrates and fishes from streams of contrasting forested landscapes in the eastern United States
Controls on mercury bioaccumulation in lotic ecosystems are not well understood. During 2007–2009, we studied mercury and stable isotope spatial patterns of macroinvertebrates and fishes from two medium-sized (
Authors
Karen Riva-Murray, Lia C. Chasar, Paul M. Bradley, Douglas A. Burns, Mark E. Brigham, Martyn J. Smith, Thomas A. Abrahamsen
Spatial and seasonal variability of dissolved methylmercury in two stream basins in the Eastern United States Spatial and seasonal variability of dissolved methylmercury in two stream basins in the Eastern United States
We assessed methylmercury (MeHg) concentrations across multiple ecological scales in the Edisto (South Carolina) and Upper Hudson (New York) River basins. Out-of-channel wetland/floodplain environments were primary sources of filtered MeHg (F-MeHg) to the stream habitat in both systems. Shallow, open-water areas in both basins exhibited low F-MeHg concentrations and decreasing F-MeHg...
Authors
Paul M. Bradley, Douglas A. Burns, Karen Riva-Murray, Mark E. Brigham, Daniel T. Button, Lia C. Chasar, Mark Marvin-DiPasquale, Mark A. Lowery, Celeste A. Journey