Brown pelicans: Improved reproduction off the southern California coast
D. W. Anderson, J.R. Jehl Jr., R.W. Risebrough, L.A. Woods Jr., L.R. DeWeese, W.G. Edgecomb
1975, Science (190) 806-808
Although still about 30 percent too low for population stability, productivity of California brown pelicans at their two northern colonies has improved significantly since 1971. Numbers of adults breeding probably reflect food supplies and recruitment from more successful colonies to the south, but improving fledging rates (up to 0.9 young...
Impacts of chemicals on waterfowl reproduction and survival
Donald H. White, L.F. Stickel
1975, International Waterfowl Symposium (1) 132-142
Residues of organochlorine pesticides, PCB's, heavy metals, and other toxic chemicals are ubiquitous in the biosphere and are commonly found in tissues and eggs of wild birds. This paper reviews research on the effects of these chemicals, with particular reference to waterfowl. Extensive mortality of waterfowl has occurred...
Caribbean coot collected in southern Florida
P.W. Sykes Jr.
1975, Florida Field Naturalist (3) 25-27
No abstract available....
Harvest trends of Canada geese in Utah
J. Tautin, J.B. Low
1975, Transactions of the North American Wildlife and Natural Resources Conference (40) 334-345
Thirty-ninth breeding bird census. 19. Upland tulip tree-maple-oak forest
C.S. Robbins
1975, American Birds (29) 1088-1089
Twenty-eighth winter bird-population study. 13. Upland tulip-tree-maple-oak forest
C.S. Robbins
1975, American Birds (29) 757-758
Breeding bald eagles in captivity
J.R. Maestrelli, Stanley N. Wiemeyer
1975, The Wilson Bulletin (87) 45-53
A 7-year-old female Bald Eagle from Alabama was paired with a 4-year-old Alaskan male in a large flight pen during December 1969. Both birds were free of physical defects when originally placed in the pen but the female was blind in one eye prior to the 1973 breeding season.....Nesting first...
Report of the American Ornithologists' Union Committee on Conservation
D.B. Marshall, A. Baldridge, James C. Bartonek, W. King, O.T. Oure, R.J. Robel, J. M. Scott
1975, The Auk (92) 1B-16B
No abstract available....
Looking out for the canvasback. Canvasback--King of the bay. Part V
Matthew C. Perry
1975, Ducks Unlimited (39) 14-16,
Birds imported into the United States in 1972
R. B. Clapp
1975, Special Scientific Report - Wildlife 193
Birds imported into the United States in 1972 are tabulated by species. Total numbers for the period 1968-72 are given for the more commonly imported taxa. The number of birds imported in 1972 (640,995) decreased by about one third from that of 1971, largely as a result of...
Wintering Areas of Bird Species Hazardous to USAF Aircraft
1975, Report
Experimental duck hunting seasons, San Luis Valley, Colorado, 1963-1970
Richard M. Hopper, Aelred D. Geis, Jack R. Grieb, Lewis Nelson Jr.
1975, Book, Wildlife Monographs
No abstract available....
Field ecology investigations of the effects of selected pesticides on wildlife populations
L. C. McEwen, J.O. Ells
1975, U.S. International Biological Program, Grassland Biome Technical Report No. 289.
The band-tailed pigeon in Utah: Results of the Utah segment of the four corners cooperative band-tailed pigeon investigation
J.C. Pederson, D.H. Nish
1975, Publication no. 75-1.
Urban planning and urban wildlife, a case study of a planned city near Washington, D.C
A. D. Geis
David Euler, Frederick Gilbert, Gerald McKeating, editor(s)
1975, Book chapter, Wildlife in Urban Canada, Proceedings of a Symposium held at the University of Guelph, May 26 to May 30, 1975
Distribution and density of bird species hazardous to aircraft
C.S. Robbins
Sidney A. Gauthreaux Jr., editor(s)
1975, Book chapter, Proceedings of a Conference on the Biological Aspects of the Bird/Aircraft Collision Problem
Only in the past 5 years has it become feasible to map the relative abundance of North American birds. Two programs presently under way and a third that is in the experimental phase are making possible the up-to-date mapping of abundance as well as distribution. A fourth program that has...
The costs and effects of chronic exposure to low-level pollutants in the environment
L.F. Stickel
1975, Book chapter, Hearings before the Subcommittee on the Environment and the Atmosphere, Committee on Science and Technology, U.S. House of Representatives, November 14, 1975
Some effects of pollutants in terrestrial ecosystems
W. H. Stickel
A.D. McIntyre, C.F. Mills, editor(s)
1975, Book chapter, Ecological Toxicology Research: Effects of Heavy Metal and Organohalogen Compounds: Proceedings of a NATO Science Committee Conference
Summary: Pollutants tend to simplify plant and animal communities by causing a progressive loss of species. At the extreme, this leads to erosion and loss of soil fertility. Weedy, broadly adapted species increase. Among animals, carnivorous species and groups are often the first to suffer. This is...
The status of the wolf in the United States, 1973
L.D. Mech, R.A. Rausch
D.H. Pimlott, editor(s)
1975, Book chapter, Wolves: Proceedings of the First Working Meeting of Wolf Specialists and of the First International Conference on the Conservation of the Wolf
A.B.A. Checklist: Birds of Continental United States and Canada
C.S. Robbins, W. Harrison, G.S. Keith, R.G. McCaskie, R.T. Peterson, N. Pettingell, O.S. Pettingell Jr., A. Small, R.W. Smart, J.A. Tucker
1975, Book
The purpose of this Checklist is to provide a complete up-to-date list of the bird species that have been recorded in the 49 continental United States and Canada. This list includes the native North American breeding species, the regular visitors, the accidentals from other countries that are believed to...
K-Ar ages of plutonic rocks in the Lassiter Coast area, Antarctica
Harald H. Mehnert, Peter D. Rowley, Dwight L. Schmidt
1975, Journal of Research of the U.S. Geological Survey (3) 233-236
Numerous middle Cretaceous stocks and small batholiths intruded Middle and Upper Jurassic sedimentary and volcanic rocks in the Lassiter Coast area of the southern Antarctic Peninsula. To establish the age of the quartz diorite and granodiorite plutonic events, five plutons were dated by the K-Ar method. The results indicate a...
Linkage effects between deposit discovery and postdiscovery exploratory drilling
Lawrence J. Drew
1975, Journal of Research of the U.S. Geological Survey (3) 169-179
For the 1950-71 period of petroleum exploration in the Powder River Basin, northeastern Wyoming and southeastern Montana, three specific topics were investigated. First, the wildcat wells drilled during the ambient phases of exploration are estimated to have discovered 2.80 times as much petroleum per well as the wildcat wells drilled...
Flows of impact melt at lunar crater
K. A. Howard, H. G. Wilshire
1975, Journal of Research of the U.S. Geological Survey (3) 237-251
Lavalike materials that were emplaced in a fluid state occur in and around lunar impact craters whose diameters range from 3 km to more than 200 km and whose ages span a time interval of at least 3.5 b.y. Evidence of fluid emplacement includes flow lobes and leveed channels, a...
An integrated-intensity method for emission spectrographic computer analysis
Catharine P. Thomas
1975, Journal of Research of the U.S. Geological Survey (3) 181-185
An integrated-intensity method has been devised to improve the computer analysis of data by emission spectrography. The area of the intensity profile of a spectral line is approximated by a rectangle whose height is related to the intensity difference between the peak and background of the line and whose width...
Delineation of buried glacial drift aquifers
Thomas C. Winter
1975, Journal of Research of the U.S. Geological Survey (3) 137-148
Locating and delineating buried glacial-drift aquifers poses one of the major problems to hydrogeologists working in glacial terrain. To show the vertical and horizontal boundaries of aquifers, most techniques require a multiple set of maps, a fence diagram, or a combination of maps and sections. Calculations of the first two...
