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Page 4648, results 116176 - 116200

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Not all publications have extents, not all extents are completely accurate
Determinants of breeding distributions of ducks
Douglas H. Johnson, J.W. Grier
1988, Wildlife Monographs (100)
The settling of breeding habitat by migratory waterfowl is a topic of both theoretical and practical interest. We use the results of surveys conducted annually during 1955-81 in major breeding areas to examine the factors that affect the distributions of 10 common North American duck species. Three patterns of settling...
Estimates of gains and losses for reservoirs on the Snake River from Blackfoot to Milner, Idaho, for selected periods, 1912 to 1983
L.C. Kjelstrom
1988, Water-Resources Investigations Report 87-4063
Croplands in the semiarid central part of the Snake River Plain are dependent on the availability of irrigation water, most of which comes from the Snake River. Allocation of irrigation water from the river requires that gains and losses be determined for American Falls Reservoir, Lake Walcott, and Milner Lake....
A finite element model for tides and currents with field applications
Roy A. Walters
1988, Communications in Applied Numerical Methods (4) 401-411
A finite element model, based upon the shallow water equations, is used to calculate tidal amplitudes and currents for two field-scale test problems. Because tides are characterized by line spectra, the governing equations are subjected to harmonic decomposition. Thus the solution variables are the real and imaginary parts of the...
Simulation of three lahars in the Mount St Helens area, Washington using a one-dimensional, unsteady-state streamflow model
Antonius Laenen, R. P. Hansen
1988, Water-Resources Investigations Report 88-4004
A one-dimensional, unsteady-state, open-channel model was used to analytically reproduce three lahar events. Factors contributing to the success of the modeling were: (1) the lahars were confined to a channel, (2) channel roughness was defined by field information, and (3) the volume of the flow remained relatively unchanged for the...
Geophysical study of a magma chamber near Mussau Island, Papua New Guinea
Shawn V. Dadisman, M. S. Marlow
1988, Book chapter, Geology and offshore resources of Pacific Island Arcs: New Ireland and Manus Region, Papa New Guinea
Analysis of a 24-channel seismic-reflection data collected near Mussau Island, Papua New Guinea, shows a high-amplitude, negative-polarity reflection that we believe is from the top of a magma chamber.  The reflecting horizon lies at a depth of about 4.4 s subbottom and can be traced laterally for 2.6 km.  On...
Isotopic evidence for organic matter oxidation by manganese reduction in the formation of stratiform manganese carbonate ore
P.M. Okita, J.B. Maynard, E.C. Spiker, E. R. Force
1988, Geochimica et Cosmochimica Acta (52) 2679-2685
Unlike other marine-sedimentary manganese ore deposits, which are largely composed of manganese oxides, the primary ore at Molango (Hidalgo State, Mexico) is exclusively manganese carbonate (rhodochrosite, Mn-calcite, kutnahorite). Stable isotope studies of the carbonates from Molango provide critical new information relevant to the controversy over syngenetic and diagenetic models of...
Effects of kelp forest removal on associated fish assemblages in central California
James L. Bodkin
1988, Journal of Experimental Marine Biology and Ecology (117) 227-238
Visual surveys along subtidal belt transects were used to compare fish assemblages on an experimental and a control site before and after the removal of a canopy-forming kelp forest. The giant kelp Macrocystis pyrifera (L.) C.A. Agardh was removed at the holdfast from ≈ 1 ha of high relief structurally complex rock...
New trend- trigonometric model for interpolation and prediction of the geomagnetic field utilizing the new DGRF models
L.R. Alldredge
1988, Journal of Geomagnetism & Geoelectricity (40) 749-759
At the IUGG Assembly at Vancouver during August 1987 new definitive geomagnetic reference field (DGRF) models to degree 10 for 1945, 1950, 1955, and 1960 were adopted by IAGA. Before these new DGRF models were accepted, the author developed a trend and trigonometric model (old trig model) based on the...
Persistent toxic substances and the health of fish communities in the Great Lakes
Wayne A. Willford
Marlene S. Evans, editor(s)
1988, Book chapter, Toxic contaminants and ecosystem health: a Great Lakes focus
The role, if any, of toxic substances in bringing about changes in the productivity and status of fishery resources, is not well understood. At the 'Workshops on Persistent Toxic Substances and the Health of the Aquatic Community,' the Fish Biota Discussion Subgroup considered the issue of toxic substances by...
Dabbling duck harvest dynamics in the Central Valley of California--implications for recruitment
M. R. Miller, J. Beam, D.P. Connelly
M.W. Weller, editor(s)
1988, Book chapter, Waterfowl in winter
Age and sex ratios and body weights were obtained for northern pintails (Anas acuta), mallards (A. platyrhynchos), American wigeon (A. americana), green-winged teal (A. crecca), and northern shovelers (A. clypeata) shot at Mendota State Wildlife Area in the San Joaquin Valley (SANJV) and at Sacramento National Wildlife Refuge in the...