Publications
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Filter Total Items: 205
Investigation of uptake and retention of atmospheric Hg(II) by boreal forest plants using stable Hg isotopes Investigation of uptake and retention of atmospheric Hg(II) by boreal forest plants using stable Hg isotopes
Although there is now a general consensus among mercury (Hg) biogeochemists that increased atmospheric inputs of inorganic Hg(II) to lakes and watersheds can result in increased methylmercury (MeHg) concentrations in fish, researchers still lack kinetic data describing the movement of Hg from the atmosphere, through watershed and lake ecosystems, and into fish. The use of isotopically...
Authors
J.A. Graydon, Louis, H. Hintelmann, S.E. Lindberg, K.A. Sandilands, J.W.M. Rudd, C.A. Kelly, M.T. Tate, D. P. Krabbenhoft, I. Lehnherr
Methylmercury enters an aquatic food web through acidophilic microbial mats in Yellowstone National Park, Wyoming Methylmercury enters an aquatic food web through acidophilic microbial mats in Yellowstone National Park, Wyoming
Microbial mats are a visible and abundant life form inhabiting the extreme environments in Yellowstone National Park (YNP), WY, USA. Little is known of their role in food webs that exist in the Park's geothermal habitats. Eukaryotic green algae associated with a phototrophic green/purple Zygogonium microbial mat community that inhabits low-temperature regions of acidic (pH ∼ 3.0) thermal...
Authors
Eric Boyd, S. King, J.K. Tomberlin, D. Nordstrom, D. P. Krabbenhoft, T. Barkay, G. Geesey
Mercury cycling in stream ecosystems. 1. Water column chemistry and transport Mercury cycling in stream ecosystems. 1. Water column chemistry and transport
We studied total mercury (THg) and methylmercury (MeHg) in eight streams, located in Oregon, Wisconsin, and Florida, that span large ranges in climate, landscape characteristics, atmospheric Hg deposition, and water chemistry. While atmospheric deposition was the source of Hg at each site, basin characteristics appeared to mediate this source by providing controls on methylation and...
Authors
M. Brigham, D.A. Wentz, G. R. Aiken, D. P. Krabbenhoft
Geological, geochemical, and geophysical studies by the U.S. Geological Survey in Big Bend National Park, Texas Geological, geochemical, and geophysical studies by the U.S. Geological Survey in Big Bend National Park, Texas
Big Bend National Park (BBNP), Tex., covers 801,163 acres (3,242 km2) and was established in 1944 through a transfer of land from the State of Texas to the United States. The park is located along a 118-mile (190-km) stretch of the Rio Grande at the United States-Mexico border. The park is in the Chihuahuan Desert, an ecosystem with high mountain ranges and basin environments containing...
Authors
W. Page, K. Turner, R. Bohannon, M. Berry, V. Williams, D. Miggins, M. Ren, E. Anthony, L. Morgan, P. Shanks, J. E. Gray, P. Theodorakos, David P. Krabbenhoft, A. Manning, P. A. Gemery-Hill, E. Hellgren, C. Stricker, D. Onorato, C. A. Finn, E. Anderson
Total mercury, methylmercury, methylmercury production potential, and ancillary streambed-sediment and pore-water data for selected streams in Oregon, Wisconsin, and Florida, 2003-04 Total mercury, methylmercury, methylmercury production potential, and ancillary streambed-sediment and pore-water data for selected streams in Oregon, Wisconsin, and Florida, 2003-04
Mercury contamination of aquatic ecosystems is an issue of national concern, affecting both wildlife and human health. Detailed information on mercury cycling and food-web bioaccumulation in stream settings and the factors that control these processes is currently limited. In response, the U.S. Geological Survey (USGS) National Water-Quality Assessment Program (NAWQA) conducted detailed...
Authors
Mark Marvin-DiPasquale, Michelle A. Lutz, David Krabbenhoft, George Aiken, William Orem, Britt Hall, John DeWild, Mark Brigham
White sturgeon mitigation and restoration in the Columbia and Snake rivers upstream from Bonneville Dam, Annual Progress Report April 2006 - March 2007. Report C White sturgeon mitigation and restoration in the Columbia and Snake rivers upstream from Bonneville Dam, Annual Progress Report April 2006 - March 2007. Report C
Describe reproduction and early life history characteristics of white sturgeon populations in the Columbia River between Bonneville and Priest Rapids dams. Define habitat requirements for spawning and rearing white sturgeon and quantify the extent of habitat available in the Columbia River between Bonneville and Priest Rapids dams. Progress updates on young-of-the-year recruitment in...
Authors
M.J. Parsley, P. Kofoot
Transport of elemental mercury in the unsaturated zone from a waste disposal site in an arid region Transport of elemental mercury in the unsaturated zone from a waste disposal site in an arid region
Mercury contained in buried landfill waste may be released via upward emission to the atmosphere or downward leaching to groundwater. Data from the US Geological Survey’s Amargosa Desert Research Site (ADRS) in arid southwestern Nevada reveal another potential pathway of Hg release: long-distance (102 m) lateral migration of elemental Hg (Hg0) through the unsaturated zone. Gas collected...
Authors
Michelle Walvoord, Brian Andraski, D. P. Krabbenhoft, Robert Striegl
Influence of plankton mercury dynamics and trophic pathways on mercury concentrations of top predator fish of a mining-impacted reservoir Influence of plankton mercury dynamics and trophic pathways on mercury concentrations of top predator fish of a mining-impacted reservoir
Physical and biogeochemical characteristics of the aquatic environment that affect growth dynamics of phytoplankton and the zooplankton communities that depend on them may also affect uptake of methylmercury (MeHg) into the pelagic food web of oligotrophic reservoirs. We evaluated changes in the quality and quantity of suspended particulate material, zooplankton taxonomy, and MeHg...
Authors
A.R. Stewart, M. Saiki, J.S. Kuwabara, Charles Alpers, M. Marvin-DiPasquale, D. P. Krabbenhoft
Influence of natural dissolved organic carbon on the bioavailability of mercury to a freshwater alga Influence of natural dissolved organic carbon on the bioavailability of mercury to a freshwater alga
Bioavailability of mercury (Hg) to Selenastrum capricornutum was assessed in bioassays containing field-collected freshwater of varying dissolved organic carbon (DOC) concentrations. Bioconcentration factor (BCF) was measured using stable isotopes of methylmercury (MeHg) and inorganic Hg(II). BCFs for MeHg in low-DOC lake water were significantly larger than those in mixtures of lake...
Authors
P.R. Gorski, D.E. Armstrong, J.P. Hurley, D. P. Krabbenhoft
Characterization and cycling of atmospheric mercury along the central US Gulf Coast Characterization and cycling of atmospheric mercury along the central US Gulf Coast
Concentrations of atmospheric Hg species, elemental Hg (Hg∘), reactive gaseous Hg (RGM), and fine particulate Hg (Hg-PM2.5) were measured at a coastal site near Weeks Bay, Alabama from April to August, 2005 and January to May, 2006. Mean concentrations of the species were 1.6 ± 0.3 ng m−3, 4.0 ± 7.5 pg m−3 and 2.7 ± 3.4 pg m−3, respectively. A strong diel pattern was observed for RGM...
Authors
M.A. Engle, M.T. Tate, D. P. Krabbenhoft, A. Kolker, M.L. Olson, E.S. Edgerton, J.F. DeWild, A.K. McPherson
Mercury and organic carbon dynamics during runoff episodes from a northeastern USA watershed Mercury and organic carbon dynamics during runoff episodes from a northeastern USA watershed
Mercury and organic carbon concentrations vary dynamically in streamwater at the Sleepers River Research Watershed in Vermont, USA. Total mercury (THg) concentrations ranged from 0.53 to 93.8 ng/L during a 3-year period of study. The highest mercury (Hg) concentrations occurred slightly before peak flows and were associated with the highest organic carbon (OC) concentrations. Dissolved...
Authors
P. F. Schuster, J. Shanley, M. Marvin-DiPasquale, M.M. Reddy, G. R. Aiken, D.A. Roth, Howard Taylor, D. P. Krabbenhoft, J.F. DeWild
Wetlands as principal zones of methylmercury production in southern Louisiana and the Gulf of Mexico region Wetlands as principal zones of methylmercury production in southern Louisiana and the Gulf of Mexico region
It is widely recognized that wetlands, especially those rich in organic matter and receiving appreciable atmospheric mercury (Hg) inputs, are important sites of methylmercury (MeHg) production. Extensive wetlands in the southeastern United States have many ecosystem attributes ideal for promoting high MeHg production rates; however, relatively few mercury cycling studies have been...
Authors
B.D. Hall, G. R. Aiken, D. P. Krabbenhoft, M. Marvin-DiPasquale, C.M. Swarzenski