Conference Papers
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Use of automated monitoring to assess behavioral toxicology in fish: Linking behavior and physiology Use of automated monitoring to assess behavioral toxicology in fish: Linking behavior and physiology
We measured locomotory behaviors (distance traveled, speed, tortuosity of path, and rate of change in direction) with computer-assisted analysis in 30 day posthatch rainbow trout (Oncorhynchus mykiss) exposed to pesticides. We also examined cholinesterase inhibition as a potential endpoint linking physiology and behavior. Sublethal exposure to chemicals often causes changes in swimming...
Authors
S.K. Brewer, A. J. DeLonay, S.L. Beauvais, E. E. Little, S.B. Jones
Use of behavioral endpoints to determine protective concentrations of the insecticide fonofos for bluegill (Lepomis macrochirus) Use of behavioral endpoints to determine protective concentrations of the insecticide fonofos for bluegill (Lepomis macrochirus)
This research compared the results of laboratory and mesocosm studies to determine the effectiveness of using behavioral measures of sublethal exposure to define environmental concentration ranges that are protective of free-ranging populations of bluegill (Lepomis macrochirus) exposed to the organophophate insecticide fonofos. Thirty-day laboratory chronic studies were conducted to...
Authors
J.F. Fairchild, E. E. Little
Use of implantable pellets to administer low levels of methyl mercury to fish Use of implantable pellets to administer low levels of methyl mercury to fish
Implantable pellets of methyl mercury chloride were tested in Nile Tilapia (Oreochromis niloticus) to appraise the effectiveness of the method for chronic studies of mercury. Two dosing regimes of 15 and 1.5 grams/CH3HgCl pellet (test 1) and 1 and 0.1 grams/pellet (test 2-3) of methyl mercury chloride were used in three tests. Additional pellets containing only matrix were used as...
Authors
B.S. Arnold, C. H. Jagoe, T. S. Gross
Utilization of the gypsum from a wet limestone flue gas desulfurization process Utilization of the gypsum from a wet limestone flue gas desulfurization process
The authors have been developing a process which converts FGD-gypsum to ammonium sulfate fertilizer with precipitated calcium carbonate as a by-product during the conversion. Preliminary cost estimates suggest that the process is economically feasible when ammonium sulfate crystals are produced in a granular size (1.2 to 3.3 mm), instead of a powder form. However, if additional revenue...
Authors
I.-M. Chou, V. Patel, J.M. Lytle, S.J. Chou, R.H. Carty
Water professionals and water policy in the Black Hills region Water professionals and water policy in the Black Hills region
A case study approach based on examples from the Black Hills region is used to evaluate the role of water professionals in developing feasible and fair public policy involving water resources. Examples presented include a long-term hydrologic investigation in the Black Hills, a local wellhead protection program, issues being addressed by a local flood management commission, coordination...
Authors
T.A. Fontaine, D.G. Driscoll, J.W. Erickson, S.J. Kenner, J.F. Sawyer
Working group on future trends Working group on future trends
This working group did not divide into subgroups, and its report consists of a unified document in a format somewhat different than those of the other working groups. The group considered four major topics: (1) projected "new" contaminants of future concern; (2) future trends with contaminants currently known to be issues for marine mammals; (3) future needs to improve and insure...
Authors
U-Pb age evidence for long-term stability of the unsaturated zone at Yucca Mountain U-Pb age evidence for long-term stability of the unsaturated zone at Yucca Mountain
No abstract available.
Authors
Leonid A. Neymark, Y. V. Amelin, James B. Paces, Zell E. Peterman
Secondary minerals record past percolation flux at Yucca Mountain, Nevada Secondary minerals record past percolation flux at Yucca Mountain, Nevada
No abstract available.
Authors
Brian D. Marshall, James B. Paces, Leonid A. Neymark, J. F. Whelan, Zell E. Peterman
Late Quaternary history of Fortymile Wash in the area near the H-road crossing Late Quaternary history of Fortymile Wash in the area near the H-road crossing
No abstract available.
Authors
Scott C. Lundstrom, James B. Paces, Shannon A. Mahan
Geochronologic and isotope studies of calcite and silica constraining Quaternary unsaturated- and saturated zone hydrologic flux at Yucca Mountain, Nevada, USA Geochronologic and isotope studies of calcite and silica constraining Quaternary unsaturated- and saturated zone hydrologic flux at Yucca Mountain, Nevada, USA
Both unsaturated- and saturated-zone aqueous solutions are capable of precipitating secondary mineral deposits that document the history and origins of past water flux. Calcite and opal occur as thin coatings on open fractures and cavity floors within the thick unsaturated zone at Yucca Mountain. Outermost surfaces of calcite have 14C ages of between 44,000 and 16,000 radiocarbon years...
Authors
James B. Paces, Zell E. Peterman, Leonid A. Neymark, Joseph F. Whelan, Brian D. Marshall
Evaluation of geologic radon potential in two regions in southwestern and southern Poland Evaluation of geologic radon potential in two regions in southwestern and southern Poland
No abstract available.
Authors
Ryszard Strzelecki, Stanislaw Wolkowicz, Wojciech Wolkowicz, Kalina Mamont-Ciesa, D.G. Mose, Zoltan Szabo, Tamara I. Ivahnenko, G.W. Mushrush
Mapping hydraulically permeable fractures using directional borehole radar and hole-to-hole tomography with a saline tracer Mapping hydraulically permeable fractures using directional borehole radar and hole-to-hole tomography with a saline tracer
Reflection-mode borehole radar and transmission-mode radar tomograms image heterogeneity in the electromagnetic properties of rock. Heterogeneity may be produced by interfaces between different rock types, foliation, and fracturing. In crystalline rock, hydraulic flow is primarily through fracture networks rather than through the rock matrix. Borehole radar methods have been applied to...
Authors
David L. Wright, John W. Lane