Use of 35-mm color aerial photography to acquire mallard sex ratio data
Edgar L. Ferguson, Dennis G. Jorde, John L. Sease
1981, Photogrammetric Engineering and Remote Sensing (47) 823-827
A conventional 35-mm camera equipped with an f2.8 135-mm lens and ASA 64 color film was used to acquire sex ratio data on mallards (Anas platyrhynchos) wintering in the Platte River Valley of south-central Nebraska. Prelight focusing for a distance of 30.5 metres and setting of shutter speed at 1/2000...
Characteristics of central North Dakota wetlands determined from sample aerial photographs and ground study
L.M. Cowardin, D.S. Gilmer, L.M. Mechlin
1981, Wildlife Society Bulletin (9) 280-288
Wetland characteristics were assessed from a systematic sample of 66 plots, 3.22 km2 each, drawn from a 10,041-km2 study area in central North Dakota. Each plot was visited once and 8 sets of aerial photographs were obtained in 3 years. Density of wetland basins was 11.00 ha/km2, and area averaged...
Culture of the glass shrimp
L. E. Chew
1981, Progressive Fish-Culturist (43) 25-26
No abstract available....
Loss of nitrogenous dissolved organic matter from small lakes
Bruce A. Manny, Akira Otsuki
1981, Journal of Freshwater Ecology (1) 193-202
To determine how much organic nitrogen is lost from lakes during winter by natural processes, we collected water in fall and winter from six small lakes (area, 5-822 hectares) and separated organic matter dissolved in the water with n-butanol into three fractions--yellow organic acids, a white precipitate, and aqueous (nonextractable)...
Sterilization of sea lampreys (Petromyzon marinus) by immersion in an aqueous solution of bisazir
Lee H. Hanson
1981, Canadian Journal of Fisheries and Aquatic Sciences (38) 1285-1289
Groups of sea lamprey (Petromyzon marinus) eggs fertilized by males previously immersed in an aqueous solution of p,p-bis(1-aziridinyl)-N-methylphosphinothioic amide (bisazir) at concentrations of 10–100 mg/L produced fewer normal, live prolarvae after 15–17 d of incubation than did groups of eggs fertilized by normal males. Mortality of embryos or prolarvae was nearly 100% in...
Influence of PCBs in water on uptake and elimination of DDT and DDE by lake trout
Robert J. Hesselberg, Lawrence W. Nicholson
1981, Journal of Environmental Quality (10) 315-318
Researchers predicted that several hundred years would be required before DDT (1,1,1 trichloro-2,2-bis [P-chlorophyl] ethane) and its metabolites were likely to decrease to nondetectable levels in Lake Michigan. But following the ban on DDT in 1970, residues of total DDT in Lake Michigan lake trout (Salvelinus namaycush) declined rapidly from...
Mutagenicity of isomeric β, γ-unsaturated n-nitrosamines derived from terpene alkanolamines
S. L. Abidi, R. A. Finch
1981, Environmental Mutagenesis (3) 587-591
No abstract available....
Historical evidence for discrete stocks of lake trout (Salvelinus namaycush) in Lake Michigan
Edward H. Brown Jr., G.W. Eck, N.R. Foster, R.M. Horrall, C.E. Coberly
1981, Canadian Journal of Fisheries and Aquatic Sciences (38) 1747-1758
Although few biological data exist on the now extinct native lake trout, Salvelinus namaycush, of Lake Michigan, historical records and interviews with former commercial fishermen strongly suggest that this once widespread resource was composed of a number of discrete spawning populations or stocks. A natural division of the resource into distinct...
Speciation of aryloxyethoxyethyl benzyl dimethyl ammonium salts by glass capillary gas chromatography and high-performance liquid chromatography
S. L. Abidi
1981, Journal of Chromatography (213) 463-474
Using glass capillary gas chromatography (GC) and ion-pair reversed-phase high-performance liquid chromatography (HPLC), a pair of structurally similar microbicides, benzyl diisobutylphenoxyethoxyethyl dimethyl ammonium chloride and its cresoxy-analogue, were effectively resolved and accurately quantified with a high degree of selectivity and specificity. Optimization of conditions in the chromatographic systems to attain...
Determination of sub-microgram amounts of selenium in geological materials by atomic-absorption spectrophotometry with electrothermal atomisation after solvent extraction
R. F. Sanzolone, T. T. Chao
1981, The Analyst (106) 647-652
An atomic-absorption spectrophotometric method with electrothermal atomisation has been developed for the determination of selenium in geological materials. The sample is decomposed with a mixture of nitric, perchloric and hydrofluoric acids and heated with hydrochloric acid to reduce selenium to selenium(IV). Selenium is then extracted into toluene from a hydrochloric...
Plain geology
George Otis Smith
1981, Report
Map showing nature of shallow subsurface sediments and biogeology in the Beeville 1 degree x 2 degrees quadrangle, Texas
H. L. Berryhill Jr., A. R. Trippet
1981, IMAP 1288-C
No abstract available....
Aeromagnetic map of east-central United States
T.G. Hildenbrand, R.P. Kucks, R. W. Johnson Jr.
1981, Geophysical Investigations Map 948
U.S. Geological Survey...
Map showing nature of shallow subsurface sediments and biogeology in the Corpus Christi 1 degree x 2 degrees quadrangle, Texas
H. L. Berryhill Jr., A. R. Trippet
1981, IMAP 1287-C
No abstract available....
Map showing water circulation and rates of sedimentation in the Corpus Christi 1 degree by 2 degrees quadrangle, Texas
H. L. Berryhill Jr., A. R. Trippet
1981, IMAP 1287-A
No abstract available....
A comparison of populations of desert tortoises, Gopherus agassizii in grazed and ungrazed areas in Ivanpah Valley, California
P.A. Medica, C.L. Lyons, F.B. Turner
1981, Report
No abstract available at this time...
A long-term resource monitoring plan for the Upper Mississippi River System
G. A. Jackson, C. E. Korschgen, P. A. Thiel, J. Besser
1981, Report
Biological activity and chemical characteristics of dredge material from ten sites on the upper Mississippi River
L. L. Marking, V. K. Dawson, J. L. Allen, T.D. Bills, J.J. Rach
1981, Report
Abstract not submitted to date...
Toxicity of six bird control chemicals to aquatic organisms
L. L. Marking, J. H. Chandler Jr.
1981, Bulletin of Environmental Contamination and Toxicology (26) 705-716
The U.S. Fish and Wildlife Service (FWS) has supported research on control methods for nuisance birds, mammals, plants, and fish. Although chemical agents have shown great promise, resource managers and regulatory agencies must be assured that these materials are safe to man and the environment. Standardized toxicity tests are conducted...
Food of the Pacific white-sided dolphin, Lagenorhynchus obliquidens, Dall's porpoise, Phocoenoides dalli, and northern fur seal, Callorhinus ursinus, off California and Washington
Richard K. Stroud, Clifford H. Fiscus, Hiroshi Kajimura
1981, Fishery Bulletin (78) 951-959
Our knowledge of the feeding habits of the Pacific white-sided dolphin, Lagenorhynchus obliquidens, and the Dall's porpoise, Phocoenoides dalli, is based on examination of the stomach contents of stranded animals, animals accidentally taken in commercial fishing gear, those taken in the western Pacific commercial fishery, and animals that died during capture...
An overview of the National Wildlife Health Laboratory after 6 years
Lynne M. Siegfried, Milton Friend
1981, Conference Paper, Proceedings of the twenty-fourth annual meeting of the American Association of Veterinary Laboratory Diagnosticians
No abstract available....
Magnetic effects of maghemitization of oceanic crust
M. Prevot, A. Lecaille, Edward A. Mankinen
1981, Journal of Geophysical Research B: Solid Earth (86) 4009-4020
Both theoretical considerations and available experimental results indicate that magnetic effects of maghemitization are strongly dependent on the grain size of the originally unoxidized titanomagnetite. Maghemitization of single‐domain titanomagnetite results in a decrease in coercivity, an increase in susceptibility, and a large decrease in Q ratio. Maghemitization of multidomain titanomagnetite results in...
The occurrence of chlorine in serpentine minerals
Y. Miura, J. Rucklidge, Gordon L. Nord Jr.
1981, Contributions to Mineralogy and Petrology (76) 17-23
Partially serpentinized dunites containing small amounts of Chlorine (< 0.5%) from Dumont, Quebec, and Horoman, Hokkaido, Japan, and one containing less than 0.05% Chlorine from Higashi-Akaishi-Yama, Ehime, Japan have been examined using the electron probe microanalyzer and scanning transmission electron microscope with X-ray analytical capabilities. Chlorine was found together with...
Considerations in planning a land use and land cover resources inventory update program
V.A. Milazzo
1981, Conference Paper, In-place resource inventories; principles and practices: Proceedings of a national workshop
No abstract available ...
Compilation of hydrologic data for the Edwards Aquifer, San Antonio area, Texas, 1934-79
R.D. Reeves, R.W. Maclay, K. C. Grimm, M.F. Davis
1981, Edwards Underground Water District Bulletin 39
No abstract available....
