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Page 6243, results 156051 - 156075

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Fish diseases
G. L. Bullock, R.E. Putz, S. F. Snieszko
O.H. Siegmund, editor(s)
1973, Book chapter, Merck Veterinary Manual, 5th edition
No abstract available at this time...
Drought displaced movement of North American pintails into Siberia
Charles J. Henny
1973, Journal of Wildlife Management (37) 23-29
During the years 1954-70, 230 pintails (Anas acuta) banded in North America were reported from eastern Asia, primarily Siberia. Most of the birds were shot on the breeding grounds in May. The movement into eastern Asia of pintails banded in the interior of North America was directly correlated with the...
Autographic theme extraction
D. Edson, Alden P. Colvocoresses
1973, Report
Remote-sensor images, including aerial and space photographs, are generally recorded on film, where the differences in density create the image of the scene. With panchromatic and multiband systems the density differences are recorded in shades of gray. On color or color infrared film, with the emulsion containing dyes sensitive to...
Tree rings : timekeepers of the past
Water Resources Division, U.S. Geological Survey
1973, Report
A casual look at the top of a tree stump reveals that it is composed of a series of concentric rings-tree rings -that become larger and larger in diameter outward from the center of the stump. Because a single tree ring is usually formed each year, the age of the...
Waterfowl production on stock-watering ponds in the northern plains
J. T. Lokemoen
1973, Journal of Range Management (26) 179-184
In a 5-year study of stock-watering ponds in western North Dakota, pond size was found to be the major factor influencing duck use. As pond size increased, total pair and brood use per pond increased. Pairs used ponds as small as 0.1 acre in size, but broods were seldom seen...
Application of theory and research in fishery management of the Laurentian Great Lakes
Stanford H. Smith
1973, Transactions of the American Fisheries Society (102) 156-163
The Great Lakes have a high potential for the conduct of research and useful application of research findings, but the history of the Great Lakes indicates that extensive research and intensive management have failed to prevent deterioration of the fisheries. At times the research was not done before a loss...
Influence of radio packs on captive mallards and blue-winged teal
R. J. Greenwood, A.B. Sargeant
1973, Journal of Wildlife Management (37) 3-9
Back-mounted radio packs of three weights were attached to 30 captive mallards (Anas platyrhynchos) and 30 blue-winged teal (A. discors), and physical condition of the birds was evaluated for 12 weeks. All groups with radio packs lost more weight than did control groups. Feather wear often followed by skin irritation...