Dave Harper (Former Employee)
Science and Products
Filter Total Items: 25
Mercury and selenium concentrations in biofilm, macroinvertebrates, and fish collected in the Yankee Fork of the Salmon River, Idaho, USA, and their potential effects on fish health Mercury and selenium concentrations in biofilm, macroinvertebrates, and fish collected in the Yankee Fork of the Salmon River, Idaho, USA, and their potential effects on fish health
The Yankee Fork is a large tributary of the Salmon River located in central Idaho, USA, with an extensive history of placer and dredge-mining activities. Concentrations of selenium (Se) and mercury (Hg) in various aquatic trophic levels were measured in the Yankee Fork during 2001 and 2002. Various measurements of fish health were also performed. Sites included four on the mainstem of...
Authors
Darren Rhea, Aida Farag, David D. Harper, Elizabeth McConnell, William Brumbaugh
The potential effects of sodium bicarbonate, a major constituent from coalbed natural gas production, on aquatic life The potential effects of sodium bicarbonate, a major constituent from coalbed natural gas production, on aquatic life
The production water from coalbed natural gas (CBNG) extraction contains many constituents. The U.S. Environmental Protection Agency has established aquatic life criteria for some of these constituents, and it is therefore possible to evaluate their risk to aquatic life. However, of the major ions associated with produced waters, chloride is the only one with an established aquatic life...
Authors
Aida Farag, David D. Harper
Potential effects of coalbed natural gas development on fish and aquatic resources Potential effects of coalbed natural gas development on fish and aquatic resources
The purpose of this chapter is to provide a summary of issues and findings related to the potential effects of coalbed natural gas (CBNG) development on fish and other aquatic resources. We reviewed CBNG issues from across the United States and used the Powder River Basin of Wyoming as a case study to exemplify some pertinent issues. The quality of water produced during CBNG extraction...
Authors
Aida Farag, David Harper, Anna Senecal, Arthur Hubert
Effects of acclimation on the toxicity of stream water contaminated with zinc and cadmium to juvenile cutthroat trout Effects of acclimation on the toxicity of stream water contaminated with zinc and cadmium to juvenile cutthroat trout
We investigated the influence of acclimation on results of in situ bioassays with cutthroat trout in metal-contaminated streams. Cutthroat trout (Oncorhynchus clarki) were held for 21 days (1) in live containers at a reference or "clean" site having dissolved metals near detection limits (0.01 ??g/L cadmium [Cd] and 2.8 ??g/L zinc [Zn]; hardness 32 mg/L as CaCO3) and (2) at a site in a...
Authors
D.D. Harper, A.M. Farag, W. Brumbaugh
Concentrations of metals in water, sediment, biofilm, benthic macroinvertebrates, and fish in the Boulder River watershed, Montana, and the role of colloids in metal uptake Concentrations of metals in water, sediment, biofilm, benthic macroinvertebrates, and fish in the Boulder River watershed, Montana, and the role of colloids in metal uptake
To characterize the partitioning of metals in a stream ecosystem, concentrations of trace metals including As, Cd, Cu, Pb, and Zn were measured in water, colloids, sediment, biofilm (also referred to as aufwuchs), macroinvertebrates, and fish collected from the Boulder River watershed, Montana. Median concentrations of Cd, Cu, and Zn in water throughout the watershed exceeded the U.S...
Authors
Aida Farag, David Nimick, Briant Kimball, Stanley Church, David Harper, William Brumbaugh
Influence of in-stream diel concentration cycles of dissolved trace metals on acute toxicity to one-year-old cutthroat trout (Oncorhynchus clarki lewisi) Influence of in-stream diel concentration cycles of dissolved trace metals on acute toxicity to one-year-old cutthroat trout (Oncorhynchus clarki lewisi)
Extrapolating results of laboratory bioassays to streams is difficult, because conditions such as temperature and dissolved metal concentrations can change substantially on diel time scales. Field bioassays conducted for 96 h in two mining‐affected streams compared the survival of hatchery‐raised, metal‐näive westslope cutthroat trout (Oncorhynchus clarki lewisi) exposed to dissolved (0...
Authors
David Nimick, David Harper, Aida Farag, Tom Cleasby, Elizabeth MacConnell, D. Skaar
The effect of chronic chromium exposure on the health of Chinook salmon (Oncorhynchus tshawytscha) The effect of chronic chromium exposure on the health of Chinook salmon (Oncorhynchus tshawytscha)
This study was designed to determine fish health impairment of Chinook salmon (Oncorhynchus tshawytscha) exposed to chromium. Juvenile Chinook salmon were exposed to aqueous chromium concentrations (0–266 μg l−1) that have been documented in porewater from bottom sediments and in well waters near salmon spawning areas in the Columbia River in the northwestern United States. After Chinook...
Authors
A.M. Farag, T. May, G.D. Marty, M. Easton, D.D. Harper, E. Little, L. Cleveland
The potential for chromium to affect the fertilization process of Chinook salmon (Oncorhynchus tshawytscha) in the Hanford Reach of the Columbia River, Washington, USA The potential for chromium to affect the fertilization process of Chinook salmon (Oncorhynchus tshawytscha) in the Hanford Reach of the Columbia River, Washington, USA
The Hanford Nuclear Reservation in south central Washington was claimed by the federal government as a site for the production of plutonium. During the course of production and operation of the facilities at Hanford, radionuclides and chromium were discharged directly into the river and also contaminated the groundwater. This study was designed to assess the effects of chromium (Cr) on...
Authors
A.M. Farag, D.D. Harper, L. Cleveland, W. Brumbaugh, E. Little
Biomonitoring in the Boulder River watershed, Montana, USA: metal concentrations in biofilm and macroinvertebrates, and relations with macroinvertebrate assemblage Biomonitoring in the Boulder River watershed, Montana, USA: metal concentrations in biofilm and macroinvertebrates, and relations with macroinvertebrate assemblage
Portions of the Boulder River watershed contain elevated concentrations of arsenic, cadmium, copper, lead, and zinc in water, sediment, and biota. We measured concentrations of As, Cd, Cu, Pb, and Zn in biofilm and macroinvertebrates, and assessed macroinvertebrate assemblage and aquatic habitat with the objective of monitoring planned remediation efforts. Concentrations of metals were...
Authors
D.T. Rhea, D.D. Harper, A.M. Farag, W. Brumbaugh
Winter habitat use by cutthroat trout in the Snake River near Jackson, Wyoming Winter habitat use by cutthroat trout in the Snake River near Jackson, Wyoming
Winter habitat use by Yellowstone cutthroat trout Oncorhynchus clarki bouvieri was monitored with radiotelemetry during November-March 1998-2001 in channelized and unaltered sections of the Snake River near Jackson, Wyoming. The use of run and off-channel pool habitat was significantly correlated to water temperature; run use was most frequent when mean water temperature exceeded 1.0°C...
Authors
D.D. Harper, A.M. Farag
Water-quality, bed-sediment, and biological data, for streams in the upper Prickly Pear Creek watershed, Montana, 2001 Water-quality, bed-sediment, and biological data, for streams in the upper Prickly Pear Creek watershed, Montana, 2001
The upper Prickly Pear Creek watershed encompasses the upstream 15 miles of Prickly Pear Creek, south of Helena, Montana (fig. 1). The headwaters of Prickly Pear Creek and its tributaries (Beavertown Creek, Clancy Creek, Dutchman Creek, Golconda Creek, Lump Gulch, Spring Creek, and Warm Springs Creek) are primarily in the Helena National Forest, whereas the central part of the watershed...
Authors
Terry Klein, Joanna N. Thamke, David D. Harper, Aida Farag, David Nimick, David Fey
Continuous flow stable isotope methods for study of δ13C fractionation during halomethane production and degradation Continuous flow stable isotope methods for study of δ13C fractionation during halomethane production and degradation
Gas chromatography/mass spectrometry/isotope ratio mass spectrometry (GC/MS/IRMS) methods for δ13C measurement of the halomethanes CH3Cl, CH3Br, CH3I and methanethiol (CH3SH) during studies of their biological production, biological degradation, and abiotic reactions are presented. Optimisation of gas chromatographic parameters allowed the identification and quantification of CO2, O2...
Authors
Robert Kalin, John Hamilton, David Harper, Laurence G. Miller, Clare Lamb, James Kennedy, Angela Downey, Sean McCauley, Allen Goldstein
Science and Products
Filter Total Items: 25
Mercury and selenium concentrations in biofilm, macroinvertebrates, and fish collected in the Yankee Fork of the Salmon River, Idaho, USA, and their potential effects on fish health Mercury and selenium concentrations in biofilm, macroinvertebrates, and fish collected in the Yankee Fork of the Salmon River, Idaho, USA, and their potential effects on fish health
The Yankee Fork is a large tributary of the Salmon River located in central Idaho, USA, with an extensive history of placer and dredge-mining activities. Concentrations of selenium (Se) and mercury (Hg) in various aquatic trophic levels were measured in the Yankee Fork during 2001 and 2002. Various measurements of fish health were also performed. Sites included four on the mainstem of...
Authors
Darren Rhea, Aida Farag, David D. Harper, Elizabeth McConnell, William Brumbaugh
The potential effects of sodium bicarbonate, a major constituent from coalbed natural gas production, on aquatic life The potential effects of sodium bicarbonate, a major constituent from coalbed natural gas production, on aquatic life
The production water from coalbed natural gas (CBNG) extraction contains many constituents. The U.S. Environmental Protection Agency has established aquatic life criteria for some of these constituents, and it is therefore possible to evaluate their risk to aquatic life. However, of the major ions associated with produced waters, chloride is the only one with an established aquatic life...
Authors
Aida Farag, David D. Harper
Potential effects of coalbed natural gas development on fish and aquatic resources Potential effects of coalbed natural gas development on fish and aquatic resources
The purpose of this chapter is to provide a summary of issues and findings related to the potential effects of coalbed natural gas (CBNG) development on fish and other aquatic resources. We reviewed CBNG issues from across the United States and used the Powder River Basin of Wyoming as a case study to exemplify some pertinent issues. The quality of water produced during CBNG extraction...
Authors
Aida Farag, David Harper, Anna Senecal, Arthur Hubert
Effects of acclimation on the toxicity of stream water contaminated with zinc and cadmium to juvenile cutthroat trout Effects of acclimation on the toxicity of stream water contaminated with zinc and cadmium to juvenile cutthroat trout
We investigated the influence of acclimation on results of in situ bioassays with cutthroat trout in metal-contaminated streams. Cutthroat trout (Oncorhynchus clarki) were held for 21 days (1) in live containers at a reference or "clean" site having dissolved metals near detection limits (0.01 ??g/L cadmium [Cd] and 2.8 ??g/L zinc [Zn]; hardness 32 mg/L as CaCO3) and (2) at a site in a...
Authors
D.D. Harper, A.M. Farag, W. Brumbaugh
Concentrations of metals in water, sediment, biofilm, benthic macroinvertebrates, and fish in the Boulder River watershed, Montana, and the role of colloids in metal uptake Concentrations of metals in water, sediment, biofilm, benthic macroinvertebrates, and fish in the Boulder River watershed, Montana, and the role of colloids in metal uptake
To characterize the partitioning of metals in a stream ecosystem, concentrations of trace metals including As, Cd, Cu, Pb, and Zn were measured in water, colloids, sediment, biofilm (also referred to as aufwuchs), macroinvertebrates, and fish collected from the Boulder River watershed, Montana. Median concentrations of Cd, Cu, and Zn in water throughout the watershed exceeded the U.S...
Authors
Aida Farag, David Nimick, Briant Kimball, Stanley Church, David Harper, William Brumbaugh
Influence of in-stream diel concentration cycles of dissolved trace metals on acute toxicity to one-year-old cutthroat trout (Oncorhynchus clarki lewisi) Influence of in-stream diel concentration cycles of dissolved trace metals on acute toxicity to one-year-old cutthroat trout (Oncorhynchus clarki lewisi)
Extrapolating results of laboratory bioassays to streams is difficult, because conditions such as temperature and dissolved metal concentrations can change substantially on diel time scales. Field bioassays conducted for 96 h in two mining‐affected streams compared the survival of hatchery‐raised, metal‐näive westslope cutthroat trout (Oncorhynchus clarki lewisi) exposed to dissolved (0...
Authors
David Nimick, David Harper, Aida Farag, Tom Cleasby, Elizabeth MacConnell, D. Skaar
The effect of chronic chromium exposure on the health of Chinook salmon (Oncorhynchus tshawytscha) The effect of chronic chromium exposure on the health of Chinook salmon (Oncorhynchus tshawytscha)
This study was designed to determine fish health impairment of Chinook salmon (Oncorhynchus tshawytscha) exposed to chromium. Juvenile Chinook salmon were exposed to aqueous chromium concentrations (0–266 μg l−1) that have been documented in porewater from bottom sediments and in well waters near salmon spawning areas in the Columbia River in the northwestern United States. After Chinook...
Authors
A.M. Farag, T. May, G.D. Marty, M. Easton, D.D. Harper, E. Little, L. Cleveland
The potential for chromium to affect the fertilization process of Chinook salmon (Oncorhynchus tshawytscha) in the Hanford Reach of the Columbia River, Washington, USA The potential for chromium to affect the fertilization process of Chinook salmon (Oncorhynchus tshawytscha) in the Hanford Reach of the Columbia River, Washington, USA
The Hanford Nuclear Reservation in south central Washington was claimed by the federal government as a site for the production of plutonium. During the course of production and operation of the facilities at Hanford, radionuclides and chromium were discharged directly into the river and also contaminated the groundwater. This study was designed to assess the effects of chromium (Cr) on...
Authors
A.M. Farag, D.D. Harper, L. Cleveland, W. Brumbaugh, E. Little
Biomonitoring in the Boulder River watershed, Montana, USA: metal concentrations in biofilm and macroinvertebrates, and relations with macroinvertebrate assemblage Biomonitoring in the Boulder River watershed, Montana, USA: metal concentrations in biofilm and macroinvertebrates, and relations with macroinvertebrate assemblage
Portions of the Boulder River watershed contain elevated concentrations of arsenic, cadmium, copper, lead, and zinc in water, sediment, and biota. We measured concentrations of As, Cd, Cu, Pb, and Zn in biofilm and macroinvertebrates, and assessed macroinvertebrate assemblage and aquatic habitat with the objective of monitoring planned remediation efforts. Concentrations of metals were...
Authors
D.T. Rhea, D.D. Harper, A.M. Farag, W. Brumbaugh
Winter habitat use by cutthroat trout in the Snake River near Jackson, Wyoming Winter habitat use by cutthroat trout in the Snake River near Jackson, Wyoming
Winter habitat use by Yellowstone cutthroat trout Oncorhynchus clarki bouvieri was monitored with radiotelemetry during November-March 1998-2001 in channelized and unaltered sections of the Snake River near Jackson, Wyoming. The use of run and off-channel pool habitat was significantly correlated to water temperature; run use was most frequent when mean water temperature exceeded 1.0°C...
Authors
D.D. Harper, A.M. Farag
Water-quality, bed-sediment, and biological data, for streams in the upper Prickly Pear Creek watershed, Montana, 2001 Water-quality, bed-sediment, and biological data, for streams in the upper Prickly Pear Creek watershed, Montana, 2001
The upper Prickly Pear Creek watershed encompasses the upstream 15 miles of Prickly Pear Creek, south of Helena, Montana (fig. 1). The headwaters of Prickly Pear Creek and its tributaries (Beavertown Creek, Clancy Creek, Dutchman Creek, Golconda Creek, Lump Gulch, Spring Creek, and Warm Springs Creek) are primarily in the Helena National Forest, whereas the central part of the watershed...
Authors
Terry Klein, Joanna N. Thamke, David D. Harper, Aida Farag, David Nimick, David Fey
Continuous flow stable isotope methods for study of δ13C fractionation during halomethane production and degradation Continuous flow stable isotope methods for study of δ13C fractionation during halomethane production and degradation
Gas chromatography/mass spectrometry/isotope ratio mass spectrometry (GC/MS/IRMS) methods for δ13C measurement of the halomethanes CH3Cl, CH3Br, CH3I and methanethiol (CH3SH) during studies of their biological production, biological degradation, and abiotic reactions are presented. Optimisation of gas chromatographic parameters allowed the identification and quantification of CO2, O2...
Authors
Robert Kalin, John Hamilton, David Harper, Laurence G. Miller, Clare Lamb, James Kennedy, Angela Downey, Sean McCauley, Allen Goldstein