Interactive effects of selenium, methionine, and dietary protein on survival, growth, and physiology in mallard ducklings
David J. Hoffman, C. J. Sanderson, L. J. LeCaptain, Eugene Cromartie, Grey W. Pendleton
1992, Archives of Environmental Contamination and Toxicology (23) 163-171
Concentrations of over 100 ppm (100 mg/kg) selenium (Se) have been found in aquatic food chains associated with irrigation drainwater. Both quantity and composition of dietary protein for wild ducklings may vary in selenium-contaminated environments. Day-old mallard (Anas platyrhynchos) ducklings received one of the following diets containing 22% protein: unsupplemented...
An implosive component in the seismic moment tensor of a mining-Induced tremor
Arthur McGarr
1992, Geophysical Research Letters (19) 1579-1582
In early 1988, a special study in one of the major South African gold fields yielded seismograms that indicate seismic moment tensors having substantial implosive components. The moment tensor, resulting from the inversion of the ground motion data from the best-recorded event, was decomposed into isotropic and deviatoric components from...
Selective dipnetting of largemouth bass during electrofishing
Daniel J. Twedt, W. Clell Guest, Bobby W. Farquhar
1992, North American Journal of Fisheries Management (12) 609-611
We electrofished 10 north‐central Texas reservoirs from 1987 through 1990 by either dipnetting all electroshocked fish (intensive dipnetting) or selectively dipnetting only fish visually identified as largemouth bass Micropterus salmoides. We compared selected indices of population structure (proportional stock density, relative stock density, and young–adult ratio) and abundance (catch per unit...
Large-scale natural gradient tracer test in sand and gravel, Cape Cod, Massachusetts: 3. Hydraulic conductivity variability and calculated macrodispersivities
Kathryn M. Hess, Steven H. Wolf, Michael A. Celia
1992, Water Resources Research (28) 2011-2027
Hydraulic conductivity (K) variability in a sand and gravel aquifer on Cape Cod, Massachusetts, was measured and subsequently used in stochastic transport theories to estimate macrodispersivities. Nearly 1500 K measurements were obtained by borehole flowmeter tests and permeameter analyses of cores. The geometric mean for the flowmeter tests (0.11 cm/s)...
Relation of nickel concentrations in tree rings to groundwater contamination
Thomas M. Yanosky, Don A. Vroblesky
1992, Water Resources Research (28) 2077-2083
Increment cores were collected from trees growing at two sites where groundwater is contaminated by nickel. Proton-induced X ray emission spectroscopy was used to determine the nickel concentrations in selected individual rings and in parts of individual rings. Ring nickel concentrations were interpreted on the basis of recent concentrations of...
The role of water in the formation of reversed micelles: An antimicellization agent
Z.-J. Yu, N.-F. Zhou, R. D. Neuman
1992, Langmuir (8) 1885-1888
Micellization of sodium bis(2-ethylhexyl) phosphate in n-heptane has been studied under controlled environmental conditions by dynamic and static light scattering. The results clearly show that a trace amount of water has a very dramatic effect on reversed micellization. In contrast with results in the literature, water can function as an...
Recruitment of seedlings and vegetative sprouts in unburned chaparral
Jon E. Keeley
1992, Ecology (73) 1194-1208
Age structure of 12 stands of chaparral, unburned for 56—120 yr, was investigated. All shrubs produced discernible growth rings, and ring counts on stems from stands of known age, plus synchrony in annual growth ring width among species in the same stand, were taken as evidence that growth rings represented...
Landslides triggered by Hurricane Hugo in eastern Puerto Rico, September 1989
Matthew C. Larsen, Angel J. Torres-Sanchez
1992, Caribbean Journal of Science (28) 113-125
On the morning of September 18, 1989, a category-four hurricane struck eastern Puerto Rico with a sustained wind speed in excess of 46 m/s. The 24-h rainfall accumulation from the hurricane ranged from 100 to 339 mm. Average rainfall intensities ranging from 34 to 39 mm/h were calculated for 4...
Aluminum in soil solutions from a subalpine spruce-fir forest at Whiteface Mountain, New York
E. K. Miller, Thomas G. Huntington, A. H. Johnson, A. J. Friedland
1992, Journal of Environmental Quality (21) 345-352
Direct or indirect Al toxicity has been suggested as a principal factor in forest tree declines. We monitored ambient soil solutions in undisturbed and experimentally manipulated soils from a fir [Abies balsamea (L.) Mill.]-spruce forest on Whiteface Mountain, NY, in order to characterize soil solution Al concentrations over a range of...
Natural selection
Allan Goddard Lindh
1992, Nature (358) 272-272
No abstract available....
Annual report of the USGS Mission, Kingdom of Saudi Arabia, for the fiscal year 1991
U.S. Geological Survey Saudi Arabia Mission
1992, Technical Report USGS-TR-92-01
An interagency report prepared by the U.S. Geological Survey Saudi Arabian Mission for the Ministry of Petroleum and Mineral Resources, Kingdom of Saudi Arabia. ...
Dynamics of Kilauea Volcano
J.J. Dvorak, Carl Johnson, Robert I. Tilling
1992, Scientific American (267) 46-53
One of the longest volcanic eruptions in recorded history began in 1983. Lava flows from Kilauea have since added 120 hectares of new land to the island of Hawaii and covered 100 square kilometres. Kilauea is one of the most thoroughly studied volcanoes in the world. That scrutiny is helping...
Deep seismic sounding in northern Eurasia
H.M. Benz, J. D. Unger, W.S. Leith, Walter D. Mooney, L. Solodilov, A.V. Egorkin, V.Z. Ryaboy
1992, Eos, Earth and Space Science News (73) 297-300
For nearly 40 years, the former Soviet Union has carried out an extensive program of seismic studies of the Earth's crust and upper mantle, known as “Deep Seismic Sounding” or DSS [Piwinskii, 1979; Zverev and Kosminskaya, 1980; Egorkin and Pavlenkova, 1981; Egorkin and Chernyshov, 1983; Scheimer and Borg, 1985]. Beginning...
Quantitative solid-state 13C nuclear magnetic resonance spectrometric analyses of wood xylen: Effect of increasing carbohydrate content
Anne L. Bates, Patrick G. Hatcher
1992, Organic Geochemistry (18) 407-416
Isolated lignin with a low carbohydrate content was spiked with increasing amounts of alpha-cellulose, and then analysed by solid-state 13C nuclear magnetic resonance (NMR) using cross-polarization with magic angle spinning (CPMAS) and dipolar dephasing methods in order to assess the quantitative reliability of CPMAS measurement of carbohydrate content and to determine...
Closure of the Isthmus of Panama: The near-shore marine record of Costa Rica and western Panama
Anthony G. Coates, Jeremy B. C. Jackson, Laurel S. Collins, Thomas M. Cronin, Harry J. Dowsett, Laurel M. Bybell, Peter Jung, Jorge Obando
1992, GSA Bulletin (104) 814-828
The final closure of the Isthmus of Panama at ∼3.5 Ma divided the American tropical ocean into two separate and different oceanographic regions. Consequences for the marine biota were profound, but, hitherto, correlation of the Pacific and Caribbean coastal sections has not been precise enough to track biologic patterns. We...
Geologic maps : Portraits of the Earth
Walter S. White
1992, Report
The picture above is a portrait of many square miles of the Earth's surface. The purpose of this leaflet is to explain how this portrait was made, how it can tell us about what lies beneath the surface of the ground, and other ways in which it can be useful...
Precipitation estimation in mountainous terrain using multivariate geostatistics. Part I: structural analysis
Joseph Hevesi, Jonathan D. Istok, Alan L. Flint
1992, Journal of Applied Meteorology (31) 661-676
Values of average annual precipitation (AAP) are desired for hydrologic studies within a watershed containing Yucca Mountain, Nevada, a potential site for a high-level nuclear-waste repository. Reliable values of AAP are not yet available for most areas within this watershed because of a sparsity of precipitation measurements and the need...
Cavity turnover and equilibrium cavity densities in a cottonwood bottomland
James A. Sedgwick, Fritz L. Knopf
1992, Journal of Wildlife Management (56) 477-484
A fundamental factor regulating the numbers of secondary cavity nesting (SCN) birds is the number of extant cavities available for nesting. The number of available cavities may be thought of as being in an approximate equilibrium maintained by a very rough balance between recruitment and loss of cavities. Based on...
Precipitation estimation in mountainous terrain using multivariate geostatistics. Part II: isohyetal maps
Joseph Hevesi, Alan L. Flint, Jonathan D. Istok
1992, Journal of Applied Meteorology (31) 677-688
Values of average annual precipitation (AAP) may be important for hydrologic characterization of a potential high-level nuclear-waste repository site at Yucca Mountain, Nevada. Reliable measurements of AAP are sparse in the vicinity of Yucca Mountain, and estimates of AAP were needed for an isohyetal mapping over a 2600-square-mile watershed containing...
Habitat characteristics at marten subnivean access sites
Janelle G. Corn, Martin G. Raphael
1992, Journal of Wildlife Management (56) 442-448
The occurrence of coarse woody debris (CWD) at sites of subnivean (under snow) access by martens (Martes americana) has not been quantified adequately, and must be better understood to provide suitable winter habitat management for the species. Consequently, we studied subnivean activity of martens in a subalpine forest in southern...
Structure of the Reelfoot rift as interpreted from 2-D magnetotelluric models
William D. Stanley, Brian D. Rodriguez
1992, Seismological Research Letters (63) 223-232
The results of magnetotelluric (MT) surveys reveal structures associated with the Reelfoot rift, including an axial high-resistivity structure that may be related to intrusions in the central part of the rift or to a previously unrecognized horst. The axis of this resistivity high generally follows the central part of the...
Comment and Reply on "Galápagos Islands: A Holocene analogue to the Wallowa accreted terrane, western North America"
George D. Stanley Jr., Tracy L. Vallier, D. L. Malmquist
1992, Geology (20) 661-662
No abstract available....
Pb isotope data indicate a complex, mantle origin for the Noril'sk-Talnakh ores, Siberia
Joseph L. Wooden, Gerald K. Czamanske, Robin M. Bouse, A.P. Likhachev, V.E. Kunilov, Victor Lyul’ko
1992, Economic Geology (87) 1153-1165
No abstract available....
Comment and reply on "Archean and Proterozoic crustal evolution: Evidence from crustal seismology"
T.F. Wever, R. Durrheim, Walter D. Mooney
1992, Geology (20) 664-666
No abstract available....
Discussion of "The modeling process and model validation" by Chin-Fu Tsang
Leonard F. Konikow
1992, Groundwater (30) 622-623
No abstract available....
