Tests of compensatory vs. additive hypotheses of mortality in mallards
Kenneth P. Burnham, David R. Anderson
1984, Ecology (65) 105-112
Band recovery data from over 410 000 adult Mallards (Anas platyrhynchos) banded in North America between 1950 and 1979 were analyzed to examine the effect of exploitation on annual survival rate. Two extreme hypotheses were defined: completely compensatory, and totally additive, and an explicit mathematical model was presented to...
Evaluation of the potential hazard to barn owls of talon (brodifacoum bait) used to control rats and house mice
Paul L. Hegdal, Raymond W. Blaskiewicz
1984, Environmental Toxicology and Chemistry (3) 167-179
During 1980, a radiotelemetry study on barn owls (Tyto alba) was conducted to evaluate the secondary hazards of the anticoagulant rodenticide TALON® (containing 0.005% brodifacoum) when it was used for controlling rats (Rattus spp.) and house mice (Mus musculus) on farms. Thirty‐five active nests were located in about 1,100 km2 (430 mi2)...
Late Leonardian plants from West Texas: The youngest Paleozoic plant megafossils in North America
S.H. Mamay, J.M. Miller, D.M. Rohr
1984, Science (223) 279-281
Abundant Permian plant megafossils were discovered in the Del Norte Mountains of Brewster County, Trans-Pecos Texas. The flora is dominated by a new and distinctive type of gigantopteroid leaves. Marine invertebrates are closely associated, and this admixture of continental and marine fossils indicates a deltaic depositional setting, probably on the...
Ultrathin lava layers exposed near San Luis Obispo Bay, California
James G. Moore, D.W. Charlton
1984, Geology (12) 542-545
Sequences of extraordinarily thin (1–5 cm thick) lava layers, resembling individual lava flows, are interbedded with Jurassic and Cretaceous pillowed lava flows near San Luis Obispo Bay on the California coast. Such layers are formed inside submarine pillowed lava pipes or flow lobes. As the lava surface in a pillow...
Effects of compression direction on the plasticity and rheology of hydrolytically weakened synthetic quartz crystals at atmospheric pressure
Mark F. Linker, Stephen H. Kirby, A. Ord, J.M. Christie
1984, Journal of Geophysical Research B: Solid Earth (89) 4241-4255
A hydrothermally grown synthetic quartz crystal with 370±60 ppm hydroxyl impurity was cut into right rectangular prisms in eight crystallographic orientations. We compressed the prisms under constant axial force corresponding to a uniaxial stress of 140.0±0.5 MPa, and temperatures of 510° and 750°C. All but one of the samples sustained...
Geologic evolution, sedimentation, and paleoenvironments of the Angola Basin and adjacent Walvis Ridge: Synthesis of results of Deep Sea Drilling Project Leg 75
Walter E. Dean, W.W. Hay, Jean-Claude Sibuet
1984, Initial Reports of the D.S.D.P. (75) 509-544
The section recovered at Site 530 (Holes 53OA and 530B) consists of eight sedimentary units and one basalt unit. The composition of the basalt recovered in Hole 53OA is distinct from typical mid-ocean ridge basalts (MORBs) but is similar to that of Hawaiian tholeiites and basalt from the central part...
Origin and geochemistry of Cretaceous deep-sea black shales and multicolored claystones, with emphasis on Deep Sea Drilling Project Site 530, southern Angola Basin
Walter E. Dean, M.A. Arthur, D.A.V. Stow
1984, Initial Reports of the D.S.D.P. (75) 819-844
Deep-water sedimentary sequences of mid-Cretaceous age, rich in organic carbon, have been recovered at many DSDP sites in the Atlantic Ocean. Most of these sequences have a marked cyclicity in amount of organic carbon resulting in interbedded multicolored shale, marlstone, and (or) limestone that have cycle periods of 20,000 to...
Carbonate and organic-carbon cycles and the history of upwelling at Deep Sea Drilling Project Site 532, Walvis Ridge, South Atlantic Ocean
J. Gardner, Walter E. Dean, C.R. Wilson
1984, Initial Reports of the D.S.D.P. (75) 905-921
Detailed carbonate and organic-carbon stratigraphies were constructed from samples collected every 20 cm in a 250-m hydraulic piston core recovered at DSDP Site 532 on Walvis Ridge. This sampling interval represents about one sample every 5000 yr., based on sediment accumulation rates calculated from nannofossil biostratigraphic zones. All samples were...
Shimada Seamount: An example of recent mid-plate volcanism
J. V. Gardner, Walter E. Dean, Richard J. Blakely
1984, GSA Bulletin (95) 855-862
Shimada Seamount is an isolated volcanic feature located between the Clipperton and Clarion Fracture Zones ∼1,150 km west of the East Pacific Rise and ∼600 km west of the inactive spreading center represented by the Mathematician Seamounts. It rises ∼3,900 m above the surrounding sea floor to within 50 m...
Models for the deposition of Mesozoic-Cenozoic fine-grained organic-carbon-rich sediment in the deep sea
M.A. Arthur, Walter E. Dean, D.A.V. Stow
1984, Geological Society of London Special Publications (15) 527-560
The widespread occurrence of organic-carbon-rich strata (‘black shales’) in certain portions of Jurassic, Cretaceous and Cenozoic sequences has been well-documented from Deep Sea Drilling Project sites in the Atlantic and Pacific Oceans and from sequences, now exposed on land, originally deposited in the Tethyan ocean. These ancient black shales...
Between Mount St. Helens and the world: How the U.S. Geological Survey provided news-media information on the 1980 volcanic eruptions
Peter D. Rowley, M. H. Hait Jr., Donald R. Finley, Donovan B. Kelly, Susan L. Russell-Robinson, Jane M. Buchanan-Banks, Katherine V. Cashman, Edna G. King
1984, Circular 921
The eruptions of Mount St. Helens volcano, Wash., constituted one of the major national and international news stories of 1980 and involved the U.S. Geological Survey in more news coverage than any other event in its history. Much of the information about the volcano came from monitoring and research by...
Flow-through bioassay for measuring bioaccumulation of toxic substances from sediment
Michael J. Mac, Carol C. Edsall, Robert J. Hesselberg, Richard E. Sayers Jr.
1984, Report
Over 10 million cubic meters of sediment are dredged annually from Great Lakes waterways. Because much of this material is taken from harbors, connecting channels, and other nearshore areas that often are contaminated with toxic substances, the sediments proposed for dredging need to be evaluated for the presence of bioavailable...
Extinction of montane populations of the northern leopard frog (Rana pippins) in Colorado
Paul Stephen Corn, James C. Fogleman
1984, Journal of Herpetology (18) 147-152
Between 1973 and 1982 nine populations of the northern leopard frog in the Red Feather Lakes region of Larimer County, Colorado, failed in reproduce. These failures all resulted in extinction of the populations. One area formerly supporting a population was recolonized in 1980, but no frogs were observed...
Evaluation of SPOT simulator data for geologic mapping in the Split Mountain region, Uintah County, Utah
G. Bryan Bailey, John L. Dwyer
1984, Book chapter, SPOT simulation applications handbook
No abstract available....
Update on the use of remote sensing in oil and gas exploration
G. Bryan Bailey, John L. Dwyer, J. R. Francica, M. S. Feng
1984, Conference Paper, Unconventional methods in exploration for petroleum and natural gas
No abstract available....
Development and implementation of a digital geologic database for petroleum exploration in the Vernal quadrangle, Utah-Colorado, U.S.A.
John L. Dwyer, Eugene A. Fosnight, David A. Hastings, G. Bryan Bailey
1984, Conference Paper, Proceedings of the International Symposium on Remote Sensing of Environment, third thematic conference: Remote Sensing for Exploration Geology
No abstract available....
Geohydrology and hydrochemistry of aquifers in Cretaceous rocks, Minnesota
H. W. Anderson Jr., J. F. Ruhl
1984, Conference Paper, Geohydrology of the Dakota aquifer, C.V. Theis Conferences on Geohydrology
No abstract available....
Optimal timing in biological processes
Byron K. Williams, James D. Nichols
1984, American Naturalist (123) 1-19
A general approach for obtaining solutions to a class of biological optimization problems is provided. The general problem is one of determining the appropriate time to take some action, when the action can be taken only once during some finite time frame. The approach can also be extended...
Chance-corrected classification for use in discriminant analysis: Ecological applications
Kimberly Titus, James A. Mosher, Byron K. Williams
1984, American Midland Naturalist (111) 1-7
A method for evaluating the classification table from a discriminant analysis is described. The statistic, kappa, is useful to ecologists in that it removes the effects of chance. It is useful even with equal group sample sizes although the need for a chance-corrected measure of prediction becomes greater...
Presence and biomagnification of organochlorine chemical residues in oxbow lakes of northeastern Louisiana
K. R. Niethammer, Donald H. White, Thomas S. Baskett, M. W. Sayre
1984, Archives of Environmental Contamination and Toxicology (13) 63-74
Ninety-eight samples of 16 species of animals were collected at Lake Providence, 88 samples of 15 species at Lake Bruin, and 21 samples of 5 species at Lake St. John, Louisiana, between 15 July and 25 September 1980. Residues of 13 organochlorine compounds were identified in these samples. Substantial concentrations...
Eggshell thickness and reproduction in American kestrels exposed to chronic dietary lead
Oliver H. Pattee
1984, Archives of Environmental Contamination and Toxicology (13) 29-34
American kestrels (Falco sparverius) were randomly paired and fed 0, 10, or 50 ppm metallic lead in their diet from November 1979–May 1980. Lead levels were elevated in bones and livers of birds receiving the treated diets, particularly the 50 ppm treatment group. Differential deposition of lead was noted between...
Evaluation of potential embryotoxicity and teratogenicity of 42 herbicides, insecticides, and petroleum contaminants to mallard eggs
David J. Hoffman, Peter H. Albers
1984, Archives of Environmental Contamination and Toxicology (13) 15-27
Results are reported for the embryotoxicity of 42 environmental contaminants applied externally to mallard (Anas platyrhynchos) eggs including crude and refined petroleum, and commercial formulations of herbicides and insecticides. Many of the petroleum pollutants were embryotoxic and moderately teratogenic and had LD50s of 0.3 to 5 μl per egg (∼6–90 μg/g...
Remote sensing and geophysical investigations of glacial buried valleys in northeastern Kansas
Jane E. Denne, Harold L. Yarger, P. A. Macfarlane, Ralph W. Knapp, Marios A. Sophocleous, James R. Lucas, Don W. Steeples
1984, Groundwater (22) 56-65
Aquifers found in glacial buried valleys are a major source of good-quality ground water in northeastern Kansas. The extent and character of many of these deposits are not precisely known, so a detailed study of the buried valleys was undertaken. Test drilling, Landsat imagery, shallow-earth temperature...
The use of decoys to attract Least Terns (Sterna antillarum) to abandoned colony sites in New Jersey
Natasha B. Kotliar, Joanna Burger
1984, Colonial Waterbirds (7) 134-138
The number of Least Tern colony sites in New Jersey has declined in recent years. Decoys were used at two recently abandoned Least Tern colony sites in New Jersey to encourage nesting. The sites were chosen because of their apparent suitability as colony sites and the relative ease...
Use of color and color infrared in coastal resource programs
James B. Johnston
1984, Conference Paper, Color aerial photography in the plant sciences and related fields : Proceedings of the Ninth Biennial Workshop on Color Aerial Photography in the Plant Sciences
No abstract available....
