Grazing intensity effects on the breeding avifauna of North Dakota native grasslands
H.A. Kantrud
1981, Canadian Field-Naturalist (95) 404-417
A breeding bird census and plant survey was conducted on 180 samples of lightly, moderately, and heavily grazed and hayed native grasslands in North Dakota in 1974. The ten most important cover plants on each of eight major physiographic landforms in three of the four regions (the Agassiz Lake Plain...
Matrix modification with silver for the electrothermal atomization of arsenic and selenium
R. F. Sanzolone, T. T. Chao
1981, Analytica Chimica Acta (128) 225-227
Silver as a matrix modifier is shown to improve the carbon-rod atomization of both arsenic and selenium for atomic absorption spectrometry. Compared to nickel, the efficiency of silver is greater for arsenic and about the same for selenium. Silver fulfils two functions in its reaction, namely stabilization during the ashing...
Satellite and field studies of man's impact on the surface in arid regions
Joseph Otterman
1981, Tellus, Series A: Dynamic Meteorology and Oceanography (33) 68-77
Models of the nadir reflectivity as a function of the fractional cover by plants or plant debris are presented and are applied to assessing the Negev vs Sinai differences and the sharp recovery (darkening) of the surface in a Sinai enclosure where anthropogenic pressures were stopped in 1974 by fencing...
Experiences with the application of the finite element method to the solution of the shallow water equations
R. A. Walters
1981, Conference Paper, Proceedings of the Seminar on two-dimensional flow modeling
No abstract available....
Earthquakes, March-April 1981
W. J. Person
1981, Earthquake Information Bulletin (USGS) (13) 195-198
There was on major earthquake (7.0-7.9) during this reporting period on April 24 in the Vanuatu Islands (formerly the New Hebrides islands). the series of strong earthquakes continued in Greece and caused additional casualties and damage, and Peru expereinced a moderate earthquake that caused fatalities and damage on April 18. In...
Electronic and optical modification of the engineering model FLD and the evolution of peripheral equipment
Robert D. Watson, Arnold F. Theisen
William R. Hemphill, Mark Settle, editor(s)
1981, Conference Paper, Workshop on applications of luminescence techniques to Earth resource studies
The purpose of the Workshop on Luminescence Techniques was threefold: (1) to review the state-of-the-art capabilities of luminescence methods, (2) to consider a variety of concepts for the development of future luminescence sensor systems, and (3) to discuss appropriate research and development strategies for advancing the current state-of-the-art....
Cognitive model for recreational spatial behavior in an urban area
Robert E. Lloyd, Robert Ader
1980, Southeastern Geographer (20) 145-159
No abstract available...
Modified fyke net for the capture and retention of salmon smolts in large rivers
S.K. Davis, J.L. Congleton, R.W. Tyler
1980, Progressive Fish-Culturist (42) 235-237
Modern sedimentary facies of the open Pacific coast and Pleistocene analogs from Montery Bay, California
W.R. Dupre, H.E. Clifton, R. E. Hunter, Michael E. Field
Michael E. Field, et al., editor(s)
1980, Conference Paper, Quaternary depositional environments of the Pacific Coast : Pacific Coast Paleogeography Symposium 4
Depositional processes and sedimentary structures of wave-dominated Pacific coastal environments vary systematically with water depth. The depth-limited open-coast facies identifiable by their sedimentary structures are the inner shelf, barred or nonbarred nearshore, beach, and coastal dune facies. These facies are most commonly preserved in shallowing-upward progradational sequences. The...
Paleoecological evaluation of Late Eocene biostratigraphic zonations of the Pacific Coast of North America
Kristin McDougall
1980, Paleontological Monograph (2) 1-75
The late Eocene zonal criteria of the west coast of North America are to a large extent controlled by paleoecology and, therefore, the correlation of coeval but environmentally different benthic foraminiferal faunas cannot be achieved before paleoecological control of the biostratigraphy is understood. The faunal trends, morphology, characteristic occurrences and...
Estimated inflow and evaporation for Great Salt Lake, Utah, 1931-76, with revised model for evaluating the effects of dikes on the water and salt balance of the lake: Comprehensive water planning program
K.M. Waddell, J.D. Barton
1980, Cooperative Investigations Report 20
No abstract available....
Storm runoff as related to urbanization in the Portland, Oregon-Vancouver, Washington Area
Antonius Laenen
1980, Water-Resources Investigations Report 80-689
A series of equations was developed to provide a better method of determining flood frequencies in the Portland-Vancouver urban area than is now available. The resulting regression equations can be used to compute peak discharge and storm runoff with a standard error of estimate of approximately 30 percent. Basins used...
Computer simulation models as tools for identifying research needs: A black duck population model
J.K. Ringelman, J. R. Longcore
1980, Transactions of the Northeast Section of the Wildlife Society, Annual Fish and Wildlife Conference (37) 182-193
Existing data on the mortality and production rates of the black duck (Anas rubripes) were used to construct a WATFIV computer simulation model. The yearly cycle was divided into 8 phases: hunting, wintering, reproductive, molt, post-molt, and juvenile dispersal mortality, and production from original and renesting attempts. The program computes...
Demography of the Everglade kite: Implications for population management
J.D. Nichols, Gary L. Hensler, P.W. Sykes Jr.
1980, Ecological Modelling (9) 215-232
Simple deterministic and stochastic population modelsi are used to examine the demographic patterns of the Everglade Kite population. These efforts are directed at making inferences about the evolution of the kite life-history pattern, and at providing guidelines for the management of the kite population. The Everglade Kite has...
On getting involved
Richard C. Banks
1980, The Auk (97) 637-638
The American Ornithologists' Union and its members had an early history of involvement in public affairs and conservation activities. A very active Committee on Bird Protection was among the first of the service committees to be established. In the 1880s it gathered data on the plumage trade and worked...
Local magnetic field measurements and fault creep observations on the San Andreas fault
M.J.S. Johnston, B.E. Smith, Robert O. Burford
1980, Tectonophysics (64) 47-57
Simultaneous creep and magnetic field records have been obtained for more than 60 episodic creep events since early 1974, no clear magnetic transients or offsets, as suggested by Breiner and Kovach (1968), are observed at or up to several days before the occurrence times of these events. Although some patterns...
Geochemistry of amino acids in shells of the clam Saxidomus
K.A. Kvenvolden, D.J. Blunt, M.A. McMenamin, S.E. Straham
1980, Physics and Chemistry of the Earth (12) 321-332
Concentrations of amino acids and their corresponding dl">dl enantiomeric ratios have been measured in shells of the bivalve mollusk Saxidomus from eleven localities, ranging in age from modern to probably more than 500,000 yr, along the Pacific coast of North America. Natural logarithms of amino acid concentrations correlate...
First-order analysis of deformation of a thrust sheet moving over a ramp
Philip Berger, Arvid M. Johnson
1980, Tectonophysics (70) T9-T24
John L. Rich introduced the revolutionary concept that many folds in the Appalachian Mountains can be explained as superficial structures formed by passive translation of thrust blocks over ramps in detachment surfaces. The amount of layer-parallel shortening can be negligible in the formation of these folds. Rich primarily was concerned...
Preliminary evaluation of lake susceptibility to water-quality degradation by recreational use, Alpine Lakes Wilderness Area, Washington
Robert J. Gilliom, D. P. Dethier, S. A. Safioles, P.L. Heller
1980, Water-Resources Investigations Report 80-1124
The relative susceptibility of lakes in the Alpine Lakes Wilderness Area to water-quality degradation was evaluated from two perspectives: (1) water-quality sensitivity, which is the tendency of a lake 's water quality to degrade in response to pollutant loading, and (2) pollutant-loading likelihood, which is determined by the presence of...
Handbook of acute toxicity of chemicals to fish and aquatic invertebrates : summaries of toxicity tests conducted at Columbia National Fisheries Research Laboratory, 1965-78
W. Waynon Johnson, Mack T. Finley
1980, Resource Publication 137
Acute toxicity is a major subject of research at Columbia National Fisheries Research Laboratory for evaluating the impact of toxic chemicals on fishery resources. The Laboratory has played a leading role in developing research technology for toxicity testing and data interpretation. In 1965-78, more than 400 chemicals were tested against...
Statistical analyses of surface-water-quality variables in the coal area of southeastern Montana
J. R. Knapton, Rodger F. Ferreira
1980, Water-Resources Investigations Report 80-40
Since 1974 a network of water-quality stations has been operated in the coal area of southeastern Montana. This report updates a previous report with 2 years of additional data collection and presents statistics and regression equations for water-quality variables. The most apparent feature of the study is the variability of...
Extension of transient-flow model of the Sacramento River at Sacramento, California
Richard N. Oltmann
1980, Water-Resources Investigations Report 80-30
The multiple-reach method-of-characteristics flow-simulaltion model that was successfully applied in 1976 to a 10.8-mile tide-affected reach of the Sacramento River, in California, from Sacramento to Freeport has been extended 10.5 miles farther downstream of Hood. The model reach was extended to improve the quality of the model 's output during...
Results and evaluation of a pilot primary monitoring network, San Francisco Bay, California, 1978
W.L. Bradford, R.T. Iwatsubo
1980, Water-Resources Investigations Report 80-73
A primary monitoring network of 12 stations, with measurements at 1-meter depth intervals every 2 weeks during periods of high inflow from the Sacramento-San Joaquin River delta, and every 4-6 weeks during seasonal low delta inflows, appears adequate to observe major changes in ambient water quality in San Francisco Bay....
An ecological characterization of the Pacific northwest coastal region. Vol. 1., conceptual model
Charles M. Proctor
1980, FWS/OBS 79/11
Seismic properties investigation of the Springer Ranch landslide, Powder River basin, Wyoming
C.H. Miller, A.L. Ramirez, T.G. Bullard
1980, Professional Paper 1170-C
A recent and rapid increase since the mid-1970's in commercial and residential development in the Powder River Basin, Wyoming and Montana, is caused by exploitation of vast coal and other resources in the basin. One geologic hazard to such development is landsliding. A landslide sufficiently representative of others in the...
