Conference Papers
Science Quality and Integrity
The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
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.
Filter Total Items: 5346
The occurrence of wetlands within the context of hydrologic landscapes
No abstract available.
Authors
Thomas C. Winter
The role of groundwater chemistry in the transport of bacteria to water-supply wells
Static mini-columns and in situ injection and recovery tests were used to assess the effects of modest changes in groundwater chemistry upon the pH-dependence of bacterial attachment, a primary determinant of bacterial mobility in drinking water aquifers. In uncontaminated groundwater (
Authors
R.W. Harvey, D.W. Metge
The spring runoff pulse from the Sierra Nevada
Just about every year there is one major first pulse of snowmelt runoff (streamflow) that marks the transition from winter to spring in high elevation, snowmelt driven watersheds in the western United States. As a index, we have used the record of relatively pristine streamflow at the Merced River, Happy Isles in Yosemite National Park to identify this transition for each year beginning in 1916. T
Authors
D.R. Cayan, D.H. Peterson, L. Riddle, M. D. Dettinger, R. Smith
The use of modeling in restoration ecology: The Everglades case
No abstract available.
Authors
Donald L. DeAngelis
U.S. Geological Survey coal resource assessment
No abstract available.
Authors
S.S. Crowley, John R. SanFilipo, Peter D. Warwick, S.J. Law, Claire E. Aubourg
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 behavior, r
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)
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 determine the
Authors
J.F. Fairchild, E. E. Little
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 controls. The pe
Authors
B.S. Arnold, C.H. Jagoe, T. S. Gross
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 from the sa
Authors
I.-Ming Chou, V. Patel, J.M. Lytle, S.J. Chou, R.H. Carty
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 of definit
Authors
T.A. Fontaine, D.G. Driscoll, J.W. Erickson, S.J. Kenner, J.F. Sawyer
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 consistency of sa
Authors
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