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.
Filter Total Items: 5549
Targeted stock identification using multilocus genotype 'familyprinting' Targeted stock identification using multilocus genotype 'familyprinting'
We present an approach to stock identification of small, targeted populations that uses multilocus microsatellite genotypes of individual mating adults to uniquely identify first- and second-generation offspring in a mixture. We call the approach 'familyprinting'; unlike DNA fingerprinting where tissue samples of individuals are matched, offspring from various families are assigned to...
Authors
B. H. Letcher, T.L. King
The occurrence of wetlands within the context of hydrologic landscapes 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 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 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...
Authors
D.R. Cayan, D. H. Peterson, L. Riddle, M. D. Dettinger, R. Smith
The use of modeling in restoration ecology: The Everglades case The use of modeling in restoration ecology: The Everglades case
No abstract available.
Authors
Donald L. DeAngelis
U.S. Geological Survey coal resource assessment 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 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