John F DeWild (Former Employee)
Science and Products
Filter Total Items: 14
Analytical inorganic chemistry results for samples collected for the Sediment-Bound Contaminant Resiliency and Response Strategy pilot study, northeastern United States, 2015 Analytical inorganic chemistry results for samples collected for the Sediment-Bound Contaminant Resiliency and Response Strategy pilot study, northeastern United States, 2015
Coastal communities are uniquely vulnerable to sea-level rise (SLR) and severe storms such as hurricanes. These events enhance the dispersion and concentration of natural and anthropogenic chemicals and pathogenic microorganisms that could adversely affect the health and resilience of coastal communities and ecosystems in coming years. The U.S. Geological Survey has developed the...
Water and Sediment Geochemistry Data from the Vicinity of Yellow Pine, Idaho, 2014-2015 Water and Sediment Geochemistry Data from the Vicinity of Yellow Pine, Idaho, 2014-2015
Samples were collected at or near baseflow conditions. Water pH and specific conductance were measured in the field, with specific conductance also measured in the laboratory and calculated based on the ionic strength of samples based on laboratory analyses. Water samples were collected for laboratory analyses using a peristaltic pump with silicon tubing. Samples were filtered through a
Filter Total Items: 42
Ratio of mercury concentration to PCB concentration varies with sex of white sucker (Catostomus commersonii) Ratio of mercury concentration to PCB concentration varies with sex of white sucker (Catostomus commersonii)
The whole-fish total mercury (Hg) concentrations were determined in 25 mature female and 26 mature male white suckers (Catostomus commersonii) caught during their spawning run in the Kewaunee River, a tributary to Lake Michigan. The age of each fish was estimated using thin-sectioned otoliths, and total length (TL) and weight were determined for each fish. When adjusted for the effect of...
Authors
Charles Madenjian, Andrew Stevens, Martin Stapanian, David Krabbenhoft, John DeWild, Jacob Ogorek, William Edwards, Lynn Ogilvie, Peter McIntyre
Mercury methylation and bioaccumulation in Sinclair Inlet, Kitsap County, Washington Mercury methylation and bioaccumulation in Sinclair Inlet, Kitsap County, Washington
The U.S. Geological Survey evaluated the transformation of mercury to bioavailable methylmercury in Sinclair Inlet, Kitsap County, Washington, and assessed the effect of the transformation processes on the mercury burden in marine organisms and sediment. In August 2008, samples of sediment, water, and biota from six sites in Sinclair Inlet and three bays representative of Puget Sound...
Authors
A.J. Paulson, M.C. Marvin-DiPasquale, P.W. Moran, A.R. Stewart, J.F. DeWild, J. Toft, J.L. Agee, E. Kakouros, Le H. Kieu, B. Carter, R.W. Sheibley, J. Cordell, David P. Krabbenhoft
Factors affecting mercury stable isotopic distribution in piscivorous fish of the Laurentian Great Lakes Factors affecting mercury stable isotopic distribution in piscivorous fish of the Laurentian Great Lakes
Identifying the sources of methylmercury (MeHg) and tracing the transformations of mercury (Hg) in the aquatic food web are important components of effective strategies for managing current and legacy Hg sources. In our previous work, we measured stable isotopes of Hg (δ202Hg, Δ199Hg, and Δ200Hg) in the Laurentian Great Lakes and estimated source contributions of Hg to bottom sediment...
Authors
Ryan F. Lepak, Sarah E. Janssen, Runsheng Yin, Jacob Ogorek, David P. Krabbenhoft, John DeWild, Michael T. Tate, Thomas Holsen, James P. Hurley
Permafrost stores a globally significant amount of mercury Permafrost stores a globally significant amount of mercury
Changing climate in northern regions is causing permafrost to thaw with major implications for the global mercury (Hg) cycle. We estimated Hg in permafrost regions based on in situ measurements of sediment total mercury (STHg), soil organic carbon (SOC), and the Hg to carbon ratio (RHgC) combined with maps of soil carbon. We measured a median STHg of 43 ± 30 ng Hg g soil−1 and a median...
Authors
Paul Schuster, Kevin Schaefer, George Aiken, Ronald Antweiler, John DeWild, Joshua Gryziec, Alessio Gusmeroli, Gustaf Hugelius, Elchin Jafarov, David Krabbenhoft, Lin Liu, Nicole Herman-Mercer, Cuicui Mu, David Roth, Tim Schaefer, Robert Striegl, Kimberly Wickland, Tingjun Zhang
Atmospheric deposition to forests in the eastern USA Atmospheric deposition to forests in the eastern USA
Atmospheric mercury (Hg) deposition to forests is important because half of the land cover in the eastern USA is forest. Mercury was measured in autumn litterfall and weekly precipitation samples at a total of 27 National Atmospheric Deposition Program (NADP) monitoring sites in deciduous and mixed deciduous-coniferous forests in 16 states in the eastern USA during 2007–2014. These...
Authors
Martin Risch, John DeWild, David Gay, Leiming Zhang, Elizabeth Boyer, David Krabbenhoft
Mercury accumulation and the mercury-PCB-sex interaction in summer flounder Mercury accumulation and the mercury-PCB-sex interaction in summer flounder
Patterns in the relative differences in contaminant concentrations between the sexes of mature fish may reveal important behavioral and physiological differences between the sexes. We determined whole-fish total mercury (Hg) concentrations in 23 female summer flounder (Paralichthys dentatus) and 27 male summer flounder from New Jersey coastal waters. To estimate the change in Hg...
Authors
Charles Madenjian, Olaf Jensen, David Krabbenhoft, John DeWild, Jacob Ogorek, Anthony Vastano
The effect of natural organic matter on mercury methylation by Desulfobulbus propionicus 1pr3 The effect of natural organic matter on mercury methylation by Desulfobulbus propionicus 1pr3
Methylation of tracer and ambient mercury (200Hg and 202Hg, respectively) equilibrated with four different natural organic matter (NOM) isolates was investigated in vivo using the Hg-methylating sulfate-reducing bacterium Desulfobulbus propionicus 1pr3. Desulfobulbus cultures grown fermentatively with environmentally representative concentrations of dissolved NOM isolates, Hg[II], and HS...
Authors
John Moreau, Caitlin Gionfriddo, David Krabbenhoft, Jacob Ogorek, John DeWild, George Aiken, Eric Roden
Use of stable isotope signatures to determine mercury sources in the Great Lakes Use of stable isotope signatures to determine mercury sources in the Great Lakes
Sources of mercury (Hg) in Great Lakes sediments were assessed with stable Hg isotope ratios using multicollector inductively coupled plasma mass spectrometry. An isotopic mixing model based on mass-dependent (MDF) and mass-independent fractionation (MIF) (δ202Hg and Δ199Hg) identified three primary Hg sources for sediments: atmospheric, industrial, and watershed-derived. Results...
Authors
Ryan Lepak, Runsheng Yin, David Krabbenhoft, Jacob Ogorek, John DeWild, Thomas Holsen, James P. Hurley
Mercury, monomethyl mercury, and dissolved organic carbon concentrations in surface water entering and exiting constructed wetlands treated with metal-based coagulants, Twitchell Island, California Mercury, monomethyl mercury, and dissolved organic carbon concentrations in surface water entering and exiting constructed wetlands treated with metal-based coagulants, Twitchell Island, California
Coagulation with metal-based salts is a practice commonly employed by drinking-water utilities to decrease particle and dissolved organic carbon concentrations in water. In addition to decreasing dissolved organic carbon concentrations, the effectiveness of iron- and aluminum-based coagulants for decreasing dissolved concentrations both of inorganic and monomethyl mercury in water was...
Authors
Elizabeth Stumpner, Tamara Kraus, Jacob A. Fleck, Angela Hansen, Sandra M. Bachand, William Horwath, John DeWild, David Krabbenhoft, Philip Bachand
Females exceed males in mercury concentrations of burbot Lota lota Females exceed males in mercury concentrations of burbot Lota lota
Examination of differences in contaminant concentrations between sexes of fish, across several fish species, may reveal clues for important behavioral and physiological differences between the sexes. We determined whole-fish total mercury (Hg) concentrations of 25 male and 25 female adult burbot Lota lota captured in Lake Erie during summer 2011, and of 14 male and 18 female adult burbot...
Authors
Charles Madenjian, Martin Stapanian, Peter Cott, David Krabbenhoft, William Edwards, Lynn Ogilvie, Justin G. Mychek-Londer, John DeWild
Spatial distribution of mercury in southeastern Alaskan streams influenced by glaciers, wetlands, and salmon Spatial distribution of mercury in southeastern Alaskan streams influenced by glaciers, wetlands, and salmon
Southeastern Alaska is a remote coastal-maritime ecosystem that is experiencing increased deposition of mercury (Hg) as well as rapid glacier loss. Here we present the results of the first reported survey of total and methyl Hg (MeHg) concentrations in regional streams and biota. Overall, streams draining large wetland areas had higher Hg concentrations in water, mayflies, and juvenile...
Authors
Sonia Nagorski, Daniel Engstrom, John Hudson, David Krabbenhoft, Eran Hood, John DeWild, George Aiken
Water column and bed-sediment core samples collected from Brownlee Reservoir near Oxbow, Oregon, 2012 Water column and bed-sediment core samples collected from Brownlee Reservoir near Oxbow, Oregon, 2012
The U.S. Geological Survey, in cooperation with Idaho Power Company, collected water-column and bed-sediment core samples from eight sites in Brownlee Reservoir near Oxbow, Oregon, during May 5–7, 2012. Water-column and bed-sediment core samples were collected at each of the eight sites and analyzed for total mercury and methylmercury. Additional bed-sediment core samples, collected from...
Authors
Ryan Fosness, Jesse Naymik, Candice Hopkins, John DeWild
Science and Products
Filter Total Items: 14
Analytical inorganic chemistry results for samples collected for the Sediment-Bound Contaminant Resiliency and Response Strategy pilot study, northeastern United States, 2015 Analytical inorganic chemistry results for samples collected for the Sediment-Bound Contaminant Resiliency and Response Strategy pilot study, northeastern United States, 2015
Coastal communities are uniquely vulnerable to sea-level rise (SLR) and severe storms such as hurricanes. These events enhance the dispersion and concentration of natural and anthropogenic chemicals and pathogenic microorganisms that could adversely affect the health and resilience of coastal communities and ecosystems in coming years. The U.S. Geological Survey has developed the...
Water and Sediment Geochemistry Data from the Vicinity of Yellow Pine, Idaho, 2014-2015 Water and Sediment Geochemistry Data from the Vicinity of Yellow Pine, Idaho, 2014-2015
Samples were collected at or near baseflow conditions. Water pH and specific conductance were measured in the field, with specific conductance also measured in the laboratory and calculated based on the ionic strength of samples based on laboratory analyses. Water samples were collected for laboratory analyses using a peristaltic pump with silicon tubing. Samples were filtered through a
Filter Total Items: 42
Ratio of mercury concentration to PCB concentration varies with sex of white sucker (Catostomus commersonii) Ratio of mercury concentration to PCB concentration varies with sex of white sucker (Catostomus commersonii)
The whole-fish total mercury (Hg) concentrations were determined in 25 mature female and 26 mature male white suckers (Catostomus commersonii) caught during their spawning run in the Kewaunee River, a tributary to Lake Michigan. The age of each fish was estimated using thin-sectioned otoliths, and total length (TL) and weight were determined for each fish. When adjusted for the effect of...
Authors
Charles Madenjian, Andrew Stevens, Martin Stapanian, David Krabbenhoft, John DeWild, Jacob Ogorek, William Edwards, Lynn Ogilvie, Peter McIntyre
Mercury methylation and bioaccumulation in Sinclair Inlet, Kitsap County, Washington Mercury methylation and bioaccumulation in Sinclair Inlet, Kitsap County, Washington
The U.S. Geological Survey evaluated the transformation of mercury to bioavailable methylmercury in Sinclair Inlet, Kitsap County, Washington, and assessed the effect of the transformation processes on the mercury burden in marine organisms and sediment. In August 2008, samples of sediment, water, and biota from six sites in Sinclair Inlet and three bays representative of Puget Sound...
Authors
A.J. Paulson, M.C. Marvin-DiPasquale, P.W. Moran, A.R. Stewart, J.F. DeWild, J. Toft, J.L. Agee, E. Kakouros, Le H. Kieu, B. Carter, R.W. Sheibley, J. Cordell, David P. Krabbenhoft
Factors affecting mercury stable isotopic distribution in piscivorous fish of the Laurentian Great Lakes Factors affecting mercury stable isotopic distribution in piscivorous fish of the Laurentian Great Lakes
Identifying the sources of methylmercury (MeHg) and tracing the transformations of mercury (Hg) in the aquatic food web are important components of effective strategies for managing current and legacy Hg sources. In our previous work, we measured stable isotopes of Hg (δ202Hg, Δ199Hg, and Δ200Hg) in the Laurentian Great Lakes and estimated source contributions of Hg to bottom sediment...
Authors
Ryan F. Lepak, Sarah E. Janssen, Runsheng Yin, Jacob Ogorek, David P. Krabbenhoft, John DeWild, Michael T. Tate, Thomas Holsen, James P. Hurley
Permafrost stores a globally significant amount of mercury Permafrost stores a globally significant amount of mercury
Changing climate in northern regions is causing permafrost to thaw with major implications for the global mercury (Hg) cycle. We estimated Hg in permafrost regions based on in situ measurements of sediment total mercury (STHg), soil organic carbon (SOC), and the Hg to carbon ratio (RHgC) combined with maps of soil carbon. We measured a median STHg of 43 ± 30 ng Hg g soil−1 and a median...
Authors
Paul Schuster, Kevin Schaefer, George Aiken, Ronald Antweiler, John DeWild, Joshua Gryziec, Alessio Gusmeroli, Gustaf Hugelius, Elchin Jafarov, David Krabbenhoft, Lin Liu, Nicole Herman-Mercer, Cuicui Mu, David Roth, Tim Schaefer, Robert Striegl, Kimberly Wickland, Tingjun Zhang
Atmospheric deposition to forests in the eastern USA Atmospheric deposition to forests in the eastern USA
Atmospheric mercury (Hg) deposition to forests is important because half of the land cover in the eastern USA is forest. Mercury was measured in autumn litterfall and weekly precipitation samples at a total of 27 National Atmospheric Deposition Program (NADP) monitoring sites in deciduous and mixed deciduous-coniferous forests in 16 states in the eastern USA during 2007–2014. These...
Authors
Martin Risch, John DeWild, David Gay, Leiming Zhang, Elizabeth Boyer, David Krabbenhoft
Mercury accumulation and the mercury-PCB-sex interaction in summer flounder Mercury accumulation and the mercury-PCB-sex interaction in summer flounder
Patterns in the relative differences in contaminant concentrations between the sexes of mature fish may reveal important behavioral and physiological differences between the sexes. We determined whole-fish total mercury (Hg) concentrations in 23 female summer flounder (Paralichthys dentatus) and 27 male summer flounder from New Jersey coastal waters. To estimate the change in Hg...
Authors
Charles Madenjian, Olaf Jensen, David Krabbenhoft, John DeWild, Jacob Ogorek, Anthony Vastano
The effect of natural organic matter on mercury methylation by Desulfobulbus propionicus 1pr3 The effect of natural organic matter on mercury methylation by Desulfobulbus propionicus 1pr3
Methylation of tracer and ambient mercury (200Hg and 202Hg, respectively) equilibrated with four different natural organic matter (NOM) isolates was investigated in vivo using the Hg-methylating sulfate-reducing bacterium Desulfobulbus propionicus 1pr3. Desulfobulbus cultures grown fermentatively with environmentally representative concentrations of dissolved NOM isolates, Hg[II], and HS...
Authors
John Moreau, Caitlin Gionfriddo, David Krabbenhoft, Jacob Ogorek, John DeWild, George Aiken, Eric Roden
Use of stable isotope signatures to determine mercury sources in the Great Lakes Use of stable isotope signatures to determine mercury sources in the Great Lakes
Sources of mercury (Hg) in Great Lakes sediments were assessed with stable Hg isotope ratios using multicollector inductively coupled plasma mass spectrometry. An isotopic mixing model based on mass-dependent (MDF) and mass-independent fractionation (MIF) (δ202Hg and Δ199Hg) identified three primary Hg sources for sediments: atmospheric, industrial, and watershed-derived. Results...
Authors
Ryan Lepak, Runsheng Yin, David Krabbenhoft, Jacob Ogorek, John DeWild, Thomas Holsen, James P. Hurley
Mercury, monomethyl mercury, and dissolved organic carbon concentrations in surface water entering and exiting constructed wetlands treated with metal-based coagulants, Twitchell Island, California Mercury, monomethyl mercury, and dissolved organic carbon concentrations in surface water entering and exiting constructed wetlands treated with metal-based coagulants, Twitchell Island, California
Coagulation with metal-based salts is a practice commonly employed by drinking-water utilities to decrease particle and dissolved organic carbon concentrations in water. In addition to decreasing dissolved organic carbon concentrations, the effectiveness of iron- and aluminum-based coagulants for decreasing dissolved concentrations both of inorganic and monomethyl mercury in water was...
Authors
Elizabeth Stumpner, Tamara Kraus, Jacob A. Fleck, Angela Hansen, Sandra M. Bachand, William Horwath, John DeWild, David Krabbenhoft, Philip Bachand
Females exceed males in mercury concentrations of burbot Lota lota Females exceed males in mercury concentrations of burbot Lota lota
Examination of differences in contaminant concentrations between sexes of fish, across several fish species, may reveal clues for important behavioral and physiological differences between the sexes. We determined whole-fish total mercury (Hg) concentrations of 25 male and 25 female adult burbot Lota lota captured in Lake Erie during summer 2011, and of 14 male and 18 female adult burbot...
Authors
Charles Madenjian, Martin Stapanian, Peter Cott, David Krabbenhoft, William Edwards, Lynn Ogilvie, Justin G. Mychek-Londer, John DeWild
Spatial distribution of mercury in southeastern Alaskan streams influenced by glaciers, wetlands, and salmon Spatial distribution of mercury in southeastern Alaskan streams influenced by glaciers, wetlands, and salmon
Southeastern Alaska is a remote coastal-maritime ecosystem that is experiencing increased deposition of mercury (Hg) as well as rapid glacier loss. Here we present the results of the first reported survey of total and methyl Hg (MeHg) concentrations in regional streams and biota. Overall, streams draining large wetland areas had higher Hg concentrations in water, mayflies, and juvenile...
Authors
Sonia Nagorski, Daniel Engstrom, John Hudson, David Krabbenhoft, Eran Hood, John DeWild, George Aiken
Water column and bed-sediment core samples collected from Brownlee Reservoir near Oxbow, Oregon, 2012 Water column and bed-sediment core samples collected from Brownlee Reservoir near Oxbow, Oregon, 2012
The U.S. Geological Survey, in cooperation with Idaho Power Company, collected water-column and bed-sediment core samples from eight sites in Brownlee Reservoir near Oxbow, Oregon, during May 5–7, 2012. Water-column and bed-sediment core samples were collected at each of the eight sites and analyzed for total mercury and methylmercury. Additional bed-sediment core samples, collected from...
Authors
Ryan Fosness, Jesse Naymik, Candice Hopkins, John DeWild