Publications
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Filter Total Items: 205
Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team, 2001 Yellowstone grizzly bear investigations: Annual report of the Interagency Grizzly Bear Study Team, 2001
The contents of this Annual Report summarize results of monitoring and research from the 2001 field season. The report also contains a summary of nuisance grizzly bear (Ursus arctos horribilis) management actions. In addition to our normal monitoring, we completed an array of studies addressing the potential impacts of winter recreation on denning grizzly bears. This research was in...
Mercury loading and methylmercury production and cycling in high-altitude lakes from the Western United States Mercury loading and methylmercury production and cycling in high-altitude lakes from the Western United States
Studies worldwide have shown that mercury (Hg) is a ubiquitous contaminant, reaching even the most remote environments such as high-altitude lakes via atmospheric pathways. However, very few studies have been conducted to assess Hg contamination levels of these systems. We sampled 90 mid-latitude, high-altitude lakes from seven national parks in the western United States during a four...
Authors
David Krabbenhoft, Mark Olson, John DeWild, David Clow, Robert Striegl, Mark Dornblaser, Peter C. Van Metre
Mercury and methylmercury contamination related to artisanal gold mining, Suriname Mercury and methylmercury contamination related to artisanal gold mining, Suriname
Elemental Hg-Au amalgamation mining practices are used widely in many developing countries resulting in significant Hg contamination of surrounding ecosystems. We have measured total Hg and methyl-Hg concentrations in sediment and water collected from artisanal Au mines and these are the first Hg speciation data from such mines in Suriname. Total Hg and methyl-Hg contents in mine-waste...
Authors
J. Gray, V.F. Labson, J. Weaver, D. P. Krabbenhoft
Methylmercury in flood-control impoundments and natural waters of northwestern Minnesota, 1997-99 Methylmercury in flood-control impoundments and natural waters of northwestern Minnesota, 1997-99
We studied methylmercury (MeHg) and total mercury (HgT) in impounded and natural surface waters in northwestern Minnesota, in settings ranging from agricultural to undeveloped. In a recently constructed (1995) permanent-pool impoundment, MeHg levels typically increased from inflow to outflow during 1997; this trend broke down from late 1998 to early 1999. MeHg levels in the outflow...
Authors
M. Brigham, D. P. Krabbenhoft, M.L. Olson, J.F. DeWild
Reactivity and mobility of new and old mercury deposition in a boreal forest ecosystem during the first year of the METAALICUS study Reactivity and mobility of new and old mercury deposition in a boreal forest ecosystem during the first year of the METAALICUS study
The METAALICUS (Mercury Experiment To Assess Atmospheric Loading In Canada and the US) project is a whole ecosystem experiment designed to study the activity, mobility, and availability of atmospherically deposited mercury. To investigate the dynamics of mercury newly deposited onto a terrestrial ecosystem, an enriched stable isotope of mercury (202Hg) was sprayed onto a Boreal forest...
Authors
H. Hintelmann, R. Harris, A. Heyes, J.P. Hurley, C.A. Kelly, D. P. Krabbenhoft, S. Lindberg, J.W.M. Rudd, K.J. Scott, Louis
Flux of dissolved forms of mercury across the sediment-water interface in Lahontan Reservoir, Nevada Flux of dissolved forms of mercury across the sediment-water interface in Lahontan Reservoir, Nevada
No abstract available.
Authors
James Kuwabara, Mark Marvin-DiPasquale, Wayne Praskins, Earl Byron, Brent Topping, James Carter, Steven Fend, Francis Parcheso, David Krabbenhoft, Mae S. Gustin
Glacial ice cores reveal a record of natural and anthropogenic atmospheric mercury deposition for the last 270 years Glacial ice cores reveal a record of natural and anthropogenic atmospheric mercury deposition for the last 270 years
No abstract available.
Authors
David Krabbenhoft, Paul Schuster
Mercury deposition in snow near an industrial emission source in the western U.S. and comparison to ISC3 model predictions Mercury deposition in snow near an industrial emission source in the western U.S. and comparison to ISC3 model predictions
Mercury (total and methyl) was evaluated in snow samples collected near a major mercury emission source on the Idaho National Engineering and Environmental Laboratory (INEEL) insoutheastern Idaho and 160 km downwind in Teton Range in westernWyoming. The sampling was done to assess near-field (
Authors
M.L. Abbott, D. D. Susong, D. P. Krabbenhoft, A.S. Rood
Trace metal concentrations in shallow ground water Trace metal concentrations in shallow ground water
Trace metal clean sampling and analysis techniques were used to examine the temporal patterns of Hg, Cu, and Zn concentrations in shallow ground water, and the relationships between metal concentrations in ground water and in a hydrologically connected river. Hg, Cu, and Zn concentrations in ground water ranged from 0.07 to 4.6 ng L−1, 0.07 to 3.10 μg L−1, and 0.17 to 2.18 μg L−1...
Authors
L.M. Zelewski, D. P. Krabbenhoft, D.E. Armstrong
A national pilot study of mercury contamination of aquatic ecosystems along multiple gradients" Bioaccumulation in fish A national pilot study of mercury contamination of aquatic ecosystems along multiple gradients" Bioaccumulation in fish
Water, sediment, and fish were sampled in the summer and fall of 1998 at 106 sites from 20 U.S. watershed basins to examine relations of mercury (Hg) and methylmercury (MeHg) in aquatic ecosystems. Bioaccumulation of Hg in fish from these basins was evaluated in relation to species, Hg and MeHg in surficial sediment and water, and watershed characteristics. Bioaccumulation was strongly...
Authors
William Brumbaugh, David Krabbenhoft, Dennis R. Helsel, James Wiener, Kathy Echols
Mercury studies in the Florida Everglades Mercury studies in the Florida Everglades
Public concern for wildlife and human health problems due to mercury (Hg) toxicity has increased substantially since the mid-1980's. These concerns are manifested primarily by the issuance of fish consumption advisories in the majority of U.S. states, Canada, and several European countries because of high levels of mercury in game fish. Although the precise causes for this contamination...
Authors
David Krabbenhoft
Methyl-mercury degradation pathways: A comparison among three mercury impacted ecosystems Methyl-mercury degradation pathways: A comparison among three mercury impacted ecosystems
We examined microbial methylmercury (MeHg) degradation in sediment of the Florida Everglades, Carson River (NV), and San Carlos Creek (CA), three freshwater environments that differ in the extent and type of mercury contamination and sediment biogeochemistry. Degradation rate constant (kdeg) values increased with total mercury (Hgt) contamination both among and within ecosystems. The...
Authors
M. Marvin-DiPasquale, J. Agee, C. Mcgowan, R.S. Oremland, M. Thomas, D. Krabbenhoft, C.C. Gilmour