Skip to main content
U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Results

184904 results.

Alternate formats: RIS file of the first 3000 search results  |  Download all results as CSV | TSV | Excel  |  RSS feed based on this search  |  JSON version of this page of results

Page 4347, results 108651 - 108675

Show results on a map

Publication Extents

Not all publications have extents, not all extents are completely accurate
Fishes
Noel M. Burkhead, R.E. Jenkins
1991, Book chapter, K. Terwilliger: Virginia's Endangered Species
No abstract available....
Geographic variation in sea otters, Enhydra lutris
Don E. Wilson, Michael A. Bogan, R.L. Brownell Jr., A.M. Burdin, M.K. Maminov
1991, Journal of Mammalogy (72) 22-36
Univariate and multivariate analyses of 20 skull characters of 304 adult sea otters from throughout the geographic range strongly suggest that three subspecies should be recognized. The nominate form, Enhydra lutris lutris, occurs from the Kuril Islands north to the Commander Islands in the western Pacific Ocean. Individuals of E. l....
PC ARC/INFO
F. D’Erchia
1991, Report
No abstract available....
Potencies of polychlorinated dibenzo-p-dioxin, dibenzofuran, and biphenyl congeners, relative to 2,3,7,8-tetrachlorodibenzo-p-dioxin, for producing early life stage mortality in rainbow trout (Oncorhynchus mykiss)
Mary K. Walker, Richard E. Peterson
1991, Aquatic Toxicology (21) 219-238
The presence of polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and biphenyls (PCBs) in feral lake trout eggs (Salvelinus namaycush) may increase the risk of lake trout early life stage mortality in the Great Lakes. To assess the combined toxicity of PCDDs, PCDFs, and PCBs to lake trout early development, toxic potencies,...
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...
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...
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...