The neotectonic setting of Puerto Rico
D.G. Masson, Kathryn M. Scanlon
1991, Geological Society of America Bulletin (103) 144-154
The island of Puerto Rico, in the northeast Caribbean, lies within a broad deformation zone between the Caribbean and North American plates. The simplest model for the tectonic setting of Puerto Rico has major strike-slip movement on nearly east-west lines in the vicinity of the Puerto Rico Trench coupled to...
Evolution of sedimentary basins/onshore oil and gas investigations: Santa Maria Province
1991, Bulletin 1995
No abstract available....
Evolution of sedimentary basins: North Slope Basin
1991, Bulletin 1990
No abstract available....
Cannibalism of nestling American kestrels by their parents and siblings
Gary R. Bortolotti, Karen L. Wiebe, William M. Iko
1991, Canadian Journal of Zoology (69) 1447-1453
We examined the frequency of cannibalism of nestling American kestrels (Falco sparverius) in north-central Saskatchewan. We investigated human disturbance and food shortages as possible causes of it. Cannibalism of nestlings by their parents and siblings was confirmed by observation and by the presence of partially eaten carcasses, or inferred from...
Evaluation of unsaturated zone air permeability through pneumatic tests
Arthur L. Baehr, Marc F. Hult
1991, Water Resources Research (27) 2605-2617
Predicting the steady state distribution of air pressure in the unsaturated zone resulting from a pneumatic test provides a method for determining air-phase permeability. This technique is analogous to the inverse problem of well hydraulics; however, air flow is more complicated than ground water flow because of air compressibility, the...
Regional patterns of terrestrial amphibian communities in Oregon and Washington
R.B. Bury, P.S. Corn, K.B. Aubry
1991, Book chapter, Wildlife and vegetation of unmanaged Douglas-fir forests
No abstract available....
Small mammal communities in the Oregon Coast Range
P.S. Corn, R.B. Bury
1991, Book chapter, Wildlife and vegetation of unmanaged Douglas-fir forests
No abstract available....
Status and conservation of parrots and parakeets in the Greater Antilles, Bahama Islands, and Cayman Islands
James W. Wiley
1991, Bird Conservation International (1) 187-214
In the 1490S a minimum of 28 species of psittacines occurred in the West Indies. Today, only 43% (12) of the species survive. All macaws and most parakeet species have been lost. Although the surviving parrot fauna of the Greater Antilles, Cayman Islands, and Bahama Islands has fared somewhat better...
Effects of mercury, selenium, and organochlorine contaminants on reproduction of Forster's terns and black skimmers nesting in a contaminated Texas bay
Kirke A. King, Thomas W. Custer, J. S. Quinn
1991, Archives of Environmental Contamination and Toxicology (20) 32-40
Mean mercury (0.40 μg/g), and geometric mean DDE (1.6 μg/g) and polychlorinated biphenyl (PCB) (2.3 μg/g) concentrations in Forster's tern (Sterna forsteri) eggs from Lavaca Bay were higher than those in tern eggs from a reference area in San Antonio Bay, but residues were not correlated with hatching success. Nest...
Proterozoic geology and ore deposits of Arizona
Karl E. Karlstrom
1991, Book
Proterozoic rocks in Arizona have been the focus of interest for geologists since the late 1800's. Early investigations, led by the U.S. Geological Survey, focused on the extensive ore deposits hosted by Proterozoic rocks. By the 1960's, these studies, combined with theses from academic institutions and the efforts of the...
Bear feeding activity at alpine insect aggregation sites in the Yellowstone ecosystem
David J. Mattson, Colin M. Gillin, Scott A. Benson, Richard R. Knight
1991, Canadian Journal of Zoology (69) 2430-2435
Bears (Ursidae) were observed from fixed-wing aircraft on or near alpine talus in the Shoshone National Forest between 15 June and 15 September in 1981–1989. Bears fed on insect aggregations at 6 known and 12 suspected alpine talus sites, disproportionately more at elevations > 3350 m, on slopes > 30°,...
Electromagnetic terrain conductive and ground penetrating radar investigation at and near the Ciba-Geigy Superfund site, Ocean County, New Jersey: quality control assurance plan and results
Gary J. Barton, Tamara Ivahnenko
1991, Book, Proceedings of the Symposium on the Application of Geophysics to Engineering and Environmental Problems
Ground water is the principal source of drinking water in the vicinity of the Ciba-Geigy Superfund site near Toms River, Ocean County, New Jersey. The presence of earlier identified point sources of organic-compound and, to a lesser extent, metals contamination dt the Ciba-Geigy Toms River Chemical Company Plant has resulted-in severe degradation of ground-water quality...
Trophic status and assessment of non-point nutrient enrichment of Lake Crescent Olympic National Park
Terence P. Boyle, David R. Beeson
1991, Report
A limited effort study was conducted in Lake Crescent, Olympic National Park to determine the trophic status and assess whether non-point nutrients were leaching into the lake and affecting biological resources. The concentration of chlorophyll a, total nitrogen concentration, and Secchi disk transparency used as parameters of the Trophic...
Movements of Yellowstone grizzly bears
Bonnie M. Blanchard, Richard R. Knight
1991, Biological Conservation (58) 41-67
Ninety-seven grizzly bears Ursus arctos horribilis were radio-located 6299 times during 1975–1987. Annual range sizes differed by sex, age, reproductive status and amount of precipitation. Females exhibited greater fidelity to seasonal and annual ranges than males. Weaned female offspring generally remained in the vicinity of the maternal range, while weaned...
Geographic information systems
Water Resources Division, U.S. Geological Survey
1991, Report
No abstract available....
Application and partial validation of a habitat model for moose in the Lake Superior region
A.W. Allen, J.W. Terrell, W.L. Mangus, E. L. Lindquist
1991, Alces (27) 50-64
A modified version of the dormant-season portion of a Habitat Suitability Index (HSI) model developed for assessing moose (Alces alces) habitat in the Lake Superior Region was incorporated in a Geographic Information System (GIS) for 490 km2 of Minnesota's Superior National Forest. Moose locations (n=235) were plotted during aerial surveys...
Riparian vegetation of the Black Canyon of the Gunnison River, Colorado: composition and response to selected hydrologic regimes based on a direct gradient assessment model
Gregor T. Auble, Jonathan M. Friedman, Michael L. Scott
1991, Report
The Black Canyon of the Gunnison National Monument is located along the Gunnison River on the western slope of the Rocky Mountains in Montrose County, Colorado. The canyon is narrow because it is cut into resistant pre-Cambrian gneiss: it has a maximum depth of 900m and a minimum width of...
Directory of assistance centers of the National Water Data Exchange (NAWDEX)
Cassandra D. Blackwell
1991, Open-File Report 91-507
Types of maps
Water Resources Division, U.S. Geological Survey
1991, Report
This booklet lists some of the many types of maps and charts available from the Federal Government-from demographic maps to foreign aeronautical charts....
Multiple outer-reef tracts along the south Florida bank margin: Outlier reefs, a new windward-margin model
Barbara H. Lidz, A. C. Hine, Eugene A. Shinn, Jack L. Kindinger
1991, Geology (19) 115-118
High-resolution seismic-reflection profiles off the lower Florida Keys reveal a multiple outlier-reef tract system ~0.5 to 1.5 km sea-ward of the bank margin. The system is characterized by a massive, outer main reef tract of high (28 m) unburied relief that parallels the margin and at least two narrower, discontinuous...
U-Th-Pb Isotopic Systematics of Lunar Norite 78235
Wayne R. Premo, M. Tatsumoto
1991, Conference Paper, Proceedings: 21st Lunar and planetary science conference
No abstract available....
The impact of introduced vectors and avian malaria on insular Passeriform bird populations in Hawaii
Charles van Riper III
1991, Bulletin of the Society of Vector Ecology (16) 59-83
No abstract available....
[Book review] The known birds of North and Middle America: Distribution and variation, migrations, changes, hybrids, etc, Part I, Hirundinidae to Mimidae, Certhiidae
Richard C. Banks
R. Phillips, editor(s)
1991, The Auk (108) 999-1003
"Known Birds" is the culmination of Allan Phillips' long and productive career in elucidating the taxonomy and relationships of North American, particularly Mexican, birds. It reflects many years of largely independent work in the field, museum, and library. Although Part I includes contributions by Robert W. Dickerman, Amadeo M. Rea,...
U-Pb isotopic characteristics of lunar meteorites Yamato-793274 and Yamato-86032
Mistunobu Tatsumoto, Wayne R. Premo
1991, Conference Paper, Proceedings of the NIPR symposium on Antarctic meteorites
No abstract available....
Late Quaternary stratigraphy and depositional history of the Long Island Sound basin
Ralph S. Lewis, Janet Radway Stone
1991, Journal of Coastal Research (11) 1-23
The stratigraphy of Late Quaternary geologic units beneath Long Island Sound (LIS) is interpreted from 3,500 km of high-resolution, seismic-reflection profiles supplemented by vibracore data. Knowledge gained from onshore regional geologic studies and previous offshore investigations is also incorporated in these interpretations. Glacial deposits overlie and nearly fill an Inner Lowland...
