A field comparison of nested grid and trapping web density estimators
David A. Jett, J.D. Nichols
1987, Journal of Mammalogy (68) 888-892
The usefulness of capture-recapture estimators in any field study will depend largely on underlying model assumptions and on how closely these assumptions approximate the actual field situation. Evaluation of estimator performance under real-world field conditions is often a difficult matter, although several approaches are possible. Perhaps the best...
Population ecology of the mallard VIII: Winter distribution patterns and survival rates of winter-banded mallards
James D. Nichols, James E. Hines
1987, Resource Publication 162
In the present report we address questions about winter distribution patterns and survival rates of North American mallards Anas platyrhynchos. Inferences are based on analyses of banding and recovery data from both winter and preseason banding period. The primary wintering range of the mallard was dividded into 45...
Relationships between nesting populations of wading birds and habitat features along the Atlantic Coast
R.M. Erwin, J. A. Spendelow, P.H. Geissler, B. Kenneth Williams
William R. Whitman, William H. Meredith, editor(s)
1987, Book chapter, Waterfowl and Wetlands Symposium: Proceedings of a Symposium on Waterfowl and Wetlands Management in the Coastal Zone of the Atlantic Flyway
Using previously published atlas data for 122 mixed-species wading bird colonies on islands along the Atlantic coast (Maine to Florida, 1976-77), we examined relationships between population sizes of 11 species of egrets, herons, ibises, and wood storks (Mycteria americana) and nine habitat variables. On nautical charts, we measured four island...
Population models and crocodile management
J.D. Nichols
Grahame J. W. Webb, S.Charlie Manolis, P. J. P. Whitehead, editor(s)
1987, Book chapter, Wildlife Management: Crocodiles and Alligators
Habitat Suitability Index Models: Snapping turtle
Brent M. Graves, Stanley H. Anderson
1987, FWS/OBS 82/10.141
A review and synthesis of existing information were used to develop a Habitat Suitability Index (HSI) model for the snapping turtle (Chelydra serpentina). The model consolidates habitat use information into a framework appropriate for field application, and is scaled to produce an index between 0.0 (unsuitable habitat) and 1.0 (optimum...
Habitat Suitability Index Models: Gray squirrel
Arthur W. Allen
1987, FWS/OBS 82/10.135
A review and synthesis of existing information were used to develop a Habitat Suitability Index (HSI) model for the gray squirrel (Sciurus carolinensis). The model consolidates habitat use information into a framework appropriate for field application, and is scaled to produce an index between 0.0 (unsuitable habitat) and 1.0 (optimum habitat)....
Habitat Suitability Index Models: Osprey
Sandra L. Vana-Miller
1987, FWS/OBS 82/10.154
A review and synthesis of existing information were used to develop a Habitat Suitability Index (HSI) model for the osprey (Pandion haliaetus). The model consolidates habitat use information into a framework appropriate for field application, and is scaled to produce an index between 0.0 (unsuitable habitat) to 1.0 (optimum habitat)....
Habitat Suitability Index Models: Lark bunting
Deborah M. Finch, Stanley H. Anderson, Wayne A. Hubert
1987, FWS/OBS 82/10.137
A review and synthesis of existing information were used to develop a Habitat Suitability Index (HSI) model for the lark bunting (Calamospiza melanocorys). The model consolidates habitat use information into a framework appropriate for field application, and is scaled to produce an index between 0.0 (unsuitable habitat) to 1.0 (optimum...
Habitat Suitability Index Models: Moose, Lake Superior region
Arthur W. Allen, Peter A. Jordan, James W. Terrell
1987, FWS/OBS 82/10.155
A review and synthesis of existing information were used to develop a Habitat Suitability Index (HSI) model for the moose (Alces alces). The model consolidates habitat use information into a framework appropriate for field application, and is scaled to produce an index between 0.0 (unsuitable habitat) to 1.0 (optimum habitat)....
Habitat Suitability Index Models: Marsh wren
Kevin J. Gutzwiller, Stanley H. Anderson
1987, FWS/OBS 82/10.139
A review and synthesis of existing information were used to develop a Habitat Suitability Index (HSI) model for the marsh wren (Cistothorus palustris). The model consolidates habitat use information into a framework appropriate for field application, and is scaled to produce an index between 0.0 (unsuitable habitat) to 1.0 (optimum...
Habitat Suitability Index Models: Northern pintail
Willie J. Suchy, Stanley H. Anderson
1987, FWS/OBS 82/10.145
A review and synthesis of existing information were used to develop a Habitat Suitability Index (HSI) model for the northern pintail (Anas acuta). The model consolidates habitat use information into a framework appropriate for field application, and is scaled to produce an index between 0.0 (unsuitable habitat) to 1.0 (optimum...
Habitat Suitability Index Models: Muskellunge
Mark F. Cook, R. Charles Solomon
1987, FWS/OBS 82/10.148
A review and synthesis of existing information were used to develop a Habitat Suitability Index (HSI) model for the muskellunge (Esox masquinongy Mitchell). The model consolidates habitat use information into a framework appropriate for field application, and is scaled to produce an index between 0.0 (unsuitable habitat) to 1.0 (optimum...
Habitat Suitability Index Models: Greater sandhill crane
Michael J. Armbruster
1987, FWS/OBS 82/10.140
A review and synthesis of existing information were used to develop a Habitat Suitability Index (HSI) model for the greater sandhill crane (Grus canadensis tabida). The model consolidates habitat use information into a framework appropriate for field application, and is scaled to produce an index between 0.0 (unsuitable habitat) to...
Habitat Suitability Index Models: Hairy woodpecker
Patrick J. Sousa
1987, FWS/OBS 82/10.146
A review and synthesis of existing information were used to develop a Habitat Suitability Index (HSI) model for the hairy woodpecker (Picoides villosus). The model consolidates habitat use information into a framework appropriate for field application, and is scaled to produce an index between 0.0 (unsuitable habitat) to 1.0 (optimum...
Habitat Suitability Index Models: Forster's tern (breeding) - Gulf and Atlantic coasts
Richard P. Martin, Phillip J. Zwank
1987, FWS/OBS 82/10.131
The nesting range of Forster's terns hosts three allopatric breeding populations. The first and most important breeding area, in terms of the number of nes t i ng pairs, includes the western guIf coas t from the Louisiana-Mississippi border to northern Tamaulipas, Mexico (American Ornithologists' Union [AOUJ 1983). In addition,...
Habitat Suitability Index Models: Plains sharp-tailed grouse
Bart L. Prose
1987, FWS/OBS 82/10.142
A review and synthesis of existing information were used to develop a Habitat Suitability Index (HSI) model for the plains sharp-tailed grouse (Tympanuchus phasianellus jamesi). The model consolidates habitat use information into a framework appropriate for field application, and is scaled to produce an index between 0.0 (unsuitable habitat) to...
The phytoplankton component of seston in San Francisco Bay
S.M. Wienke, J. E. Cloern
1987, Netherlands Journal of Sea Research (21) 25-33
Phytoplankton biomass (as carbon) was estimated from chlorophyll a concentrations (Chla) and a mean value for the ratio of phytoplankton carbon to chlorophyll a in San Francisco Bay. The ratio was determined as the slope of a Model II regression of POC' against (Chla), where POC' is total particulate organic carbon minus sediment-associated non-phytoplankton...
North American nonmarine climates and vegetation during the Late Cretaceous
J. A. Wolfe, G.R. Upchurch Jr.
1987, Palaeogeography, Palaeoclimatology, Palaeoecology (61) 33-77
Analyses of physiognomy of Late Cretaceous leaf assemblages and of structural adaptations of Late Cretaceous dicotyledonous woods indicate that megathermal vegetation was an open-canopy, broad-leaved evergreen woodland that existed under low to moderate amounts of rainfall evenly distributed through the year, with a moderate increase at about 40–45°N. Many dicotyledons...
Spectral analysis of topography and gravity in the Basin and Range Province
Y. Ricard, C. Froidevaux, R. Simpson
1987, Tectonophysics (133) 175-187
A two-dimensional spectral analysis has been carried out for the topography and the Bouguer gravity anomaly of the Basin and Range Province in western North America. The aim was to investigate the possible presence of dominant wavelengths in the deformation pattern at the surface and at the depth of compensation....
Nucleation and triggering of earthquake slip: Effect of periodic stresses
James H. Dieterich
1987, Tectonophysics (144) 127-139
Results of stability analyses for spring and slider systems, with state variable constitutive properties, are applied to slip on embedded fault patches. Unstable slip may nucleate only if the slipping patch exceeds some minimum size. Subsequent to the onset of instability the earthquake slip may propagate well beyond the patch....
Fault failure with moderate earthquakes
M.J.S. Johnston, A. T. Linde, M. T. Gladwin, R. D. Borcherdt
1987, Tectonophysics (144) 189-206
High resolution strain and tilt recordings were made in the near-field of, and prior to, the May 1983 Coalinga earthquake (ML = 6.7, Δ = 51 km), the August 4, 1985, Kettleman Hills earthquake (ML = 5.5, Δ = 34 km), the April 1984 Morgan Hill earthquake (ML = 6.1, Δ = 55 km), the November 1984 Round Valley...
Modelling aftershock migration and afterslip of the San Juan Bautista, California, earthquake of October 3, 1972
R. L. Wesson
1987, Tectonophysics (144) 215-229
The San Juan Bautista earthquake of October 3, 1972 (ML = 4.8), located along the San Andreas fault in central California, initiated an aftershock sequence characterized by a subtle, but perceptible, tendency for aftershocks to spread to the northwest and southeast along the fault zone. The apparent dimension of the aftershock...
Analysis of saltwater upconing beneath a pumping well
T. E. Reilly, A.S. Goodman
1987, Journal of Hydrology (89) 169-204
Aquifer systems that contain freshwater and saltwater are usually stratified, with the more dense saltwater underlying the freshwater. A groundwater well discharging from the freshwater zone causes the saltwater to move upwards towards the well. This phenomenon is known as saltwater upconing. Two methods of analysis, the sharp-interface method and...
Regional regression of flood characteristics employing historical information
Gary D. Tasker, J.R. Stedinger
1987, Journal of Hydrology (96) 255-264
Streamflow gauging networks provide hydrologic information for use in estimating the parameters of regional regression models. The regional regression models can be used to estimate flood statistics, such as the 100 yr peak, at ungauged sites as functions of drainage basin characteristics. A recent innovation in regional regression is the...
Origins of seawater intrusion in a coastal aquifer - A case study of the Pajaro Valley, California
L.D. Bond, J.D. Bredehoeft
1987, Journal of Hydrology (92) 363-388
Seawater may enter and contaminate stratified coastal aquifers through a number of different pathways. These pathways and their relative contribution are examined in the Pajaro Valley, California, a coastal area with extensive groundwater development. This study considers three pathways of possible intrusion of the primary confined aquifer: (1) onshore leakage...
