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Page 3339, results 83451 - 83475

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Not all publications have extents, not all extents are completely accurate
Passing of northern pike and common carp through experimental barriers designed for use in wetland restoration
John R. P. French III, Douglas A. Wilcox, S. Jerrine Nichols
1999, Wetlands (19) 883-888
Restoration plans for Metzger Marsh, a coastal wetland on the south shore of western Lake Erie, incorporated a fish-control system designed to restrict access to the wetland by large common carp (Cyprinus carpio). Ingress fish passageways in the structure contain slots into which experimental grates of varying size and shape...
Hydrogeomorphic factors and ecosystem responses in coastal wetlands of the Great Lakes
J.R. Keough, T.A. Thompson, G.R. Guntenspergen, D.A. Wilcox
1999, Wetlands (19) 821-834
Gauging the impact of manipulative activities, such as rehabilitation or management, on wetlands requires having a notion of the unmanipulated condition as a reference. And understanding of the reference condition requires knowledge of dominant factors influencing ecosystem processes and biological communities. In this paper, we focus on natural physical factors...
Evaluation of factors that influence estimated zones of transport for six municipal wells in Clark County, Washington
L.L. Orzol, Margot Truini
1999, Water-Resources Investigations Report 97-4224
A ground-water flow model was used in conjunction with particle tracking to estimate zones of transport for six municipal well sites in Clark County, Washington. A zone of transport for a well is a three-dimensional volume within a ground-water system that contains all of the ground water that will discharge...
Environmental characteristics and water quality of hydrologic benchmark network stations in the Midwestern United States, 1963-95
M. Alisa Mast, John T. Turk
1999, Circular 1173-B
This report describes the environmental characteristics and water quality at 14 benchmark basins in the Midwestern United States. The information in this report was compiled to aid in the application and interpretation of historical water-quality data collected by the U.S. Geological Survey Hydrologic Benchmark Network program. The streams discussed in...
Quantitative paleoclimatic reconstructions from late Pleistocene plant macrofossils of the Yucca Mountain region
R.S. Thompson, K. H. Anderson, P. J. Bartlein
1999, Open-File Report 99-338
Plant macrofossil assemblages recovered from packrat (Neotoma) middens of late Pleistocene age from the present-day Mojave Desert of southern Nevada contain plant species that today live at higher elevations and/or farther north than the midden collection sites. Previous reconstructions of late Pleistocene climates from packrat midden assemblages in this region...
U.S. Geological Survey middle Rio Grande basin study; proceedings of the third annual workshop, Albuquerque, New Mexico, February 24-25, 1999
James R. Bartolino
1999, Open-File Report 99-203
Approximately 40 percent (about 600,000 people) of the total population of New Mexico lives within the Middle Rio Grande Basin, which includes the City of Albuquerque. Ongoing analyses of the central portion of the Middle Rio Grande Basin by the U.S. Geological Survey (USGS) in cooperation with the City of Albuquerque and...
Estimation of methanogen biomass via quantitation of coenzyme M
Dwayne A. Elias, Lee R. Krumholz, Ralph S. Tanner, Joseph M. Suflita
1999, Applied and Environmental Microbiology (65) 5541-5545
Determination of the role of methanogenic bacteria in an anaerobic ecosystem often requires quantitation of the organisms. Because of the extreme oxygen sensitivity of these organisms and the inherent limitations of cultural techniques, an accurate biomass value is very difficult to obtain. We standardized a simple method for estimating methanogen...
Hydrolysis of tert-butyl formate: Kinetics, products, and implications for the environmental impact of methyl tert-butyl ether
Clinton D. Church, James F. Pankow, Paul G. Tratnyek
1999, Environmental Toxicology and Chemistry (18) 2789-2796
Asessing the environmental fate of methyl tert-butyl ether (MTBE) has become a subject of renewed interest because of the large quantities of this compound that are being used as an oxygenated additive in gasoline. Various studies on the fate of MTBE have shown that it can be degraded to tert-butyl...
Tritium and plutonium in waters from the Bering and Chukchi Seas
E. R. Landa, D. M. Beals, J.E. Halverson, R. L. Michel, G.R. Cefus
1999, Health Physics (77) 668-676
During the summer of 1993, seawater in the Bering and Chukchi Seas was sampled on a joint Russian-American cruise [BERPAC] of the RV Okean to determine concentrations of tritium, 239Pu and 240Pu. Concentrations of tritium were determined by electrolytic enrichment and liquid scintilation counting. Tritium levels ranged up to 420...
Geochemical investigations and interim recommendations for priority abandoned mine sites, BLM lands, upper Animas River watershed, San Juan County, Colorado
J. Thomas Nash
1999, Open-File Report 99-323
Field observations, sampling of mine dumps and mine drainage waters, and laboratory studies of dump materials have been made at mining areas deemed to be on public lands administered by the U. S. Bureau of Land Management (BLM) in the Upper Animas River watershed. Results of chemical analyses of dump materials, leachates of those...
Discovery of a second population of white-collared seedeaters, Sporophila torqueola (Passeriformes: emberizidae) along the Rio Grande of Texas
Marc C. Woodin, Mary K. Skoruppa, Gene W. Blacklock, Graham C. Hickman
1999, Southwestern Naturalist (44) 535-538
The range of the white-collared seedeater (Sporophila torqueola), a tropical grassland species, extends from Central America northward along both coasts of Mexico (Eitniear, 1997), including Tamaulipas and Nuevo Leon (Howell and Webb, 1995). White-collared seedeaters historically occurred commonly in extreme southern Texas (Oberholser, 1974; Rappole and Blacklock, 1994). However,...
Cruise report; RV Coastal Surveyor Cruise C1-99; multibeam mapping of the Long Beach, California continental shelf; April 12 through May 19, 1999
James V. Gardner, John E. Hughes Clarke, Larry A. Mayer
1999, Open-File Report 99-360
The greater Los Angeles area of California is home to more than 10 million people. This large population puts increased pressure on the adjacent offshore continental shelf and margin with activities such as ocean disposal for dredged spoils, explosive disposal, waste-water outfall, and commercial fishing. The increased utilization of the...