Stable isotopes and mineral resource investigations in the United States
Robert R. Seal, II
1999, Report
The elements oxygen, hydrogen, sulfur, and carbon are important constituents of hydrothermal ore-forming systems and the weathering processes of mineral deposits in the surficial environment. They also play key roles in volcanic activity, ecosystem dynamics, climate change, and hydrologic and atmospheric processes. Therefore, study of the stable isotopes of these...
Environmental processes that affect mineral deposits in the eastern United States
Robert R. Seal, II
1999, Report
A thorough understanding of the environmental processes that affect mineral deposits and mine wastes has become increasingly important as the Nation wrestles with how to meet our current demand for metals without compromising the environment and how to mitigate the damage caused by the mining practices of previous generations. Regulatory...
Laramide to Holocene structural development of the northern Colorado Front Range
Eric A. Erslev, Karl S. Kellogg, Bruce Bryant, Timothy K. Ehrlich, Steven M. Holdaway, Charles W. Naeser
David R. Lageson, Alan Trudgill Lester Trudgill, Bruce, editor(s)
1999, Book chapter, Colorado and adjacent areas
The Rocky Mountain province of the United States is a classic basement-involved foreland orogen. Deformation during the Late Cretaceous to Eocene Laramide orogeny created an anastomosing system of basement-cored arches that bound the northern and eastern margins of the Colorado Plateau and the elliptical sedimentary basins of the Rockies. The...
Influence of temperature and substrate on infection rate, triactinomyxon production, and release duration from eastern tubifex worms infected with Myxobolus cerebralis
Thomas Waldrop, Vicki Blazer, David Smith, Bane Schill, Christine Densmore
B. Schill, T. Waldrop, V. Blazer, editor(s)
1999, Book, 5th Annual Whirling Disease Symposium: Research and Management Perspectives
Salmonid whirling disease is caused by Myxobolus cerebralis, a metazoan parasite with a two host life cycle involving salmonid fish a an aquatic oligochaete, Tubifex tubifex (Wolf, Markiw and Hiltunen, 1986). Whirling disease has been reported in 22 U.S. states with the greatest losses occurring in the salmonid fisheries...
Geology of the Loess Hills, Iowa
1999, Report
Many Americans think of Iowa as having little topographic variation. However, in westernmost Iowa the Loess Hills rise 200 feet above the flat plains forming a narrow band running north-south 200 miles along the Missouri River. The steep angles and sharp bluffs on the western side of the Loess Hills...
200,000 years of climate change recorded in eolian sediments of the High Plains of eastern Colorado and western Nebraska
Daniel R. Muhs, James B. Swinehart, David B. Loope, John N. Aleinikoff, Josh Been
David R. Lageson, Alan Lester, Bruce Trudgill, editor(s)
1999, Book chapter, Colorado and adjacent areas
Loess and eolian sand cover vast areas of the western Great Plains of Nebraska, Kansas and Colorado (Fig. 1). In recent studies of Quaternary climate change, there has been a renewed interest in loess and eolian sand. Much of the attention now given to loess stems from new studies of...
Assessment of landscape correlates of Eastern hemlock decline due to hemlock woolly adelgid
John Young, Craig Snyder, James Akerson, Gary Hunt
K.A. McManus, K.S. Shields, D.R. Souto, editor(s)
1999, Report, Proceedings, Symposium on sustainable management of hemlock ecosystems in Eastern North America
Eastern hemlock (Tsuga canadensis) is in decline throughout its range in the eastern US due to infestation by an exotic insect pest, the hemlock woolly adelgid (Adelges tsugae). In Shenandoah National Park, the hemlock woolly adelgid (HWA) rapidly killed many stands of hemlock after first appearing in the late-1980’s, while having only minor impact in other...
Application of aerial gamma-ray spectrometric and magnetic surveys in geologic mapping: a case study in southern Virginia and northern North Carolina
J. Wright Horton Jr., David L. Daniels
1999, Book chapter, Geology of the Fall Zone Region along to North Carolina-Virginia State Line: guidebook for the 1999 meeting of the Carolina Geological Society
Aerial gamma-ray spectrometric and magnetic survey maps are valuable aids for geologic mapping where rocks are poorly exposed in south-central Virginia and northernmost North Carolina. Broad low areas on the potassium and thorium gamma-ray survey maps distinguish the Carolina, Spring Hope, and Roanoke Rapids terranes from more highly radiogenic areas of the Raleigh...
Atlantic white cedar plantings in St. Tammany Parish, Louisiana, and the Bogue Chitto National Wildlife Refuge, Mississippi
John W. McCoy, Bobby D. Keeland, James A. Allen
1999, Conference Paper, Proceedings Atlantic white-cedar: Ecology and management symposium
Populations of Atlantic white cedar (Chamaecyparis thyoides (L.) B.S.P.) growing at the extreme western range of the species are in danger of being lost, and information on the ecology of these populations is limited. Seeds and seedlings ("wildlings") were collected near Vancleave, MS. The wildlings were transplanted to bay-head sites...
Ground-water flow paths and traveltime to three small embayments within the Peconic Estuary, eastern Suffolk County, New York
Christopher Schubert
1999, Water-Resources Investigations Report 98-4181
The Peconic Estuary, at the eastern end of Long Island, has been plagued by a recurrent algal bloom that has caused the severe decline of local marine resources. Although the onset, duration, and cessation of the bloom remain unpredictable, ground-water discharge has been shown to affect surface-water quality in the...
Fish losses to double-crested cormorant predation in Eastern Lake Ontario, 1992-97
Robert M. Ross, James H. Johnson
1999, USDA APHIS Technical Bulletin 1879
We examined 4,848 regurgitated digestive pellets of double-crested cormorants (Phalacrocorax auritus) over a 6-year period (1992–97) to estimate annual predation on sport and other fishes in the eastern basin of Lake Ontario. We found more than 51,000 fish of 28 species. Using a model that incorporates annual colony nest counts;...
Avian cholera
Milton Friend
1999, Information and Technology Report 1999-0001
Avian cholera is a contagious disease resulting from infection by the bacterium Pasteurella multocida. Several subspecies of bacteria have been proposed for P. multocida, and at least 16 different P. multocida serotypes or characteristics of antigens in bacterial cells that differentiate bacterial variants from each other have been recognized....
Effect of altered salmonid stocking methods on cormorant predation in eastern Lake Ontario
R. M. Ross, J. H. Johnson
1999, Report, Final Report: To assess the impact of double-crested cormorant predation on the smallmouth bass and other fishes of the eastern basin of Lake Ontario; Volume Section 11; New York State Department of Environmental Conservation Bureau of Fisheries
No abstract available at this time...
Changes in element contents of four lichens over 11 years in the Boundary Waters Canoe Area Wilderness, northern Minnesota
James P. Bennett, C. M. Wetmore
1999, Environmental and Experimental Botany (41) 75-82
Four species of lichen (Cladina rangiferina, Evernia mesomorpha, Hypogymnia physodes, and Parmelia sulcata) were sampled at six locations in the Boundary Waters Canoe Area Wilderness three times over a span of 11 years and analyzed for concentrations of 16 chemical elements to test the hypotheses that corticolous species would accumulate higher amounts...
Defining landscapes suitable for restoration of grizzly bears Ursus arctos in Idaho
Troy Merrill, D.J. Mattson, R.G. Wright, Howard B. Quigley
1999, Biological Conservation (87) 231-248
Informed management of large carnivores depends on the timely and useful presentation of relevant information. We describe an approach to evaluating carnivore habitat that uses pre-existing qualitative and quantitative information on humans and carnivores to generate coarse-scale maps of habitat suitability, habitat productivity, potential reserves, and areas of potential conflict....
Integrating physical and chemical characteristics of lakes into the glacially influenced landscape of the Northern Cascade Mountains, Washington State, USA
Gary L. Larson, G.A. Lomnicky, Robert Hoffman, W.J. Liss, E. Deimling
1999, Environmental Management (24) 219-228
A basic knowledge of the physical and chemical characteristics of lakes is needed by management to make informed decisions to protect water resources. In this study we investigated some of the physical and chemical characteristics of 58 lakes in alpine, subalpine, and forest vegetation zones in a natural area (North...
Consumption of rainbow smelt by walleye and salmonine fishes in eastern Lake Erie
D.W. Einhouse, M.T. Bur, F.C. Cornelius, R. Kenyon, C.P. Madenjian, P.S. Rand, K.L. Sztramko, L.D. Witzel
M. Munawar, T. Edsall, I.F. Munawar, editor(s)
1999, Book chapter, The state of Lake Erie: past, present and future
At present, rainbow smelt appear to represent a key component of the eastern Lake Erie fish community as they are the dominant prey for virtually every open water predator, and are harvested directly by an important Ontario commercial fishery. In response to concern over the status of rainbow smelt...
Bar-tailed Godwits Limosa lapponica in Alaska: A population estimate from the staging grounds
Robert E. Gill Jr., Brian J. McCaffery
1999, Wader Study Group Bulletin (88) 49-54
Bar-tailed Godwits Limosa lapponica were surveyed on their staging grounds in Alaska during September 1995 and 1997. The single high count of 94,000 birds closely matched that of counts from New Zealand and south-eastern Australia, the known non-breeding area for most of the baueri subspecies. Numbers recorded on the southern...
Surface phenology and satellite sensor-derived onset of greenness: An initial comparison
Mark D. Schwartz, Bradley C. Reed
1999, International Journal of Remote Sensing (20) 3451-3457
The objective of this work was to document the utility of phenological data derived from satellite sensors by comparing them with modelled phenology. Surface phenological model outputs (first leaf and first bloom dates) were correlated positively with satellite sensor-derived start of season (SOS) dates for 1991-1995 across the eastern United...
Late Quaternary slip rate and seismic hazards of the West Klamath Lake fault zone near Crater Lake, Oregon Cascades
C. R. Bacon, M. A. Lanphere, D.E. Champion
1999, Geology (27) 43-46
Crater Lake caldera is at the north end of the Klamath graben, where this N10°W-trending major Basin and Range structure impinges upon the north-south–trending High Cascades volcanic arc. East-facing normal faults, typically 10–15 km long, form the West Klamath Lake fault zone, which bounds the graben on its west side....
Prediction of gas production using well logs, Cretaceous of north-central Montana
T.C. Hester
1999, Mountain Geologist (36) 85-98
Cretaceous gas sands underlie much of east-central Alberta and southern Saskatchewan, eastern Montana, western North Dakota, and parts of South Dakota and Wyoming. Estimates of recoverable biogenic methane from these rocks in the United States are as high as 91 TCF. In northern Montana, current production is localized around a...
Deaggregation of probabilistic ground motions in the central and eastern United States
S. Harmsen, D. Perkins, A. Frankel
1999, Bulletin of the Seismological Society of America (89) 1-13
Probabilistic seismic hazard analysis (PSHA) is a technique for estimating the annual rate of exceedance of a specified ground motion at a site due to known and suspected earthquake sources. The relative contributions of the various sources to the total seismic hazard are determined as a function of their occurrence rates...
Historical trends of metals in the sediments of San Francisco Bay, California
Michelle I. Hornberger, S. N. Luoma, A. VanGeen, C. Fuller, R. Anima
1999, Marine Chemistry (64) 39-55
Concentrations of Ag, Al, Cr, Cu, Fe, Hg, Mn, Ni, Pb, V and Zn were determined in six sediment cores from San Francisco Bay (SFB) and one sediment core in Tomales Bay (TB), a reference estuary. SFB cores were collected from between the...
Chronology of polyphase extension in the Windermere Hills, northeast Nevada
K.J. Mueller, P.K. Cerveny, M. E. Perkins, L.W. Snee
1999, Geological Society of America Bulletin (111) 11-27
Fission-track and 40Ar/39Ar dating and chemical correlation of volcanic strata exposed in the Windermere Hills and northern Pequop Mountains, northeast Nevada, indicate a protracted, polyphase history of Tertiary (late Eocene–late Miocene) extension along the northern margin of a major Cordilleran metamorphic core complex. Early...
Application of geologic map information to water quality issues in the southern part of the Chesapeake Bay watershed, Maryland and Virginia, eastern United States
L. McCartan, J. D. Peper, L. J. Bachman, J. Wright Horton Jr.
1999, Journal of Geochemical Exploration (64) 355-376
Geologic map units contain much information about the mineralogy, chemistry, and physical attributes of the rocks mapped. This paper presents information from regional-scale geologic maps in Maryland and Virginia, which are in the southern part of the Chesapeake Bay watershed in the eastern United States. The geologic map information is...
