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United States Department of Agriculture Wildlife Services: Staff Publications

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Articles 1621 - 1625 of 1625

Full-Text Articles in Physical Sciences and Mathematics

Compensatory Response Of Maturing Corn Kernels Following Simulated Damage By Birds, Paul P. Woronecki, Robert A. Stehn, Richard A. Dolbeer Jan 1980

Compensatory Response Of Maturing Corn Kernels Following Simulated Damage By Birds, Paul P. Woronecki, Robert A. Stehn, Richard A. Dolbeer

United States Department of Agriculture Wildlife Services: Staff Publications

(1) A study was made to measure compensatory growth responses and to estimate losses associated with bird damage to maturing corn.
(2) Corn kernels contain 20-40% of their final biomass at the time they are usually consumed by blackbirds.
(3) Very slight compensation of kernel weight occurred following simulated bird damage to tip kernels.
(4) Heavy bird damage, early in kernel development, increased fungal, sprouting, and insect damage before harvest.
(5) Estimates of bird damage, subsequent secondary damage, and compensation were affected by the amount of damage, maturity of the kernels at the time of damage, and environmental factors before, …

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Agricultural Impact Of A Winter Population Of Blackbirds And Starlings, Richard A. Dolbeer, Paul P. Woronecki, Allen R. Stickley Jr., Stephen B. White Mar 1978

Agricultural Impact Of A Winter Population Of Blackbirds And Starlings, Richard A. Dolbeer, Paul P. Woronecki, Allen R. Stickley Jr., Stephen B. White

United States Department of Agriculture Wildlife Services: Staff Publications

The major concentration of blackbirds and Starlings (Sturnus vulgaris) in North America occurs in the southeastern United States where an estimated 350 million Red-winged Blackbirds (Agelaius phoeniceus) , Common Grackles (Quiscalus quiscula) , Brown-headed Cowbirds (Molothrus ater) , and Starlings congregate in winter roosts (Meanley 1971, 1975, 1977). An estimated 75-100 major (containing >l million birds) roosts form in the southeastern states each year. Increasing attention is being given to many of these roosts because of nuisance problems, reputed health hazards, and agricultural damage associated with them. Although considerable effort has been directed toward developing methods for reducing roosting populations …

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Movement And Migration Patterns Of Red-Winged Blackbirds: A Continental Overview, Richard A. Dolbeer Jan 1978

Movement And Migration Patterns Of Red-Winged Blackbirds: A Continental Overview, Richard A. Dolbeer

United States Department of Agriculture Wildlife Services: Staff Publications

From 1924 through 1974, about 11,000 recoveries accumulated from the banding of over 700,000 Red-winged Blackbirds(Agelaius phoeniceus) in North America. A few studies have examined some of these data for specific localities during certain times of the year; however, no attempt has been made to examine the total recovery data to compile a general picture of continental movement and migration patterns. Increasing attention is being given to blackbird (Icteridae) and Starling (Sturnus vulgaris) populations in North America because of their reported crop depredations, health hazards, and nuisance aspects, especially when congregating in large roosts (Meanley,1975;Graham, 1976). Solutions to these problems …

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Reproduction In The Red Squirrel (Tamiasciurus Hudsonicus) In Colorado, Richard A. Dolbeer May 1973

Reproduction In The Red Squirrel (Tamiasciurus Hudsonicus) In Colorado, Richard A. Dolbeer

United States Department of Agriculture Wildlife Services: Staff Publications

Information on reproduction of the red squirrel (Tamiasciumrs hudsonicus) can be gleaned from studies in the northeastern United States (Klugh, 1927; Hamilton, 1939; Layne, 1954) and in western Canada (Miller, 1970; Smith, 1968; Kemp and Keith, 1971; Wood, 1967). However, there is a paucity of information on reproduction from the mountainous regions of the western United States. This paper presents reproductive information on the red squirrel from Colorado and helps fill this void. In addition, the reproductive strategy of red squirrels is briefly compared with that of snowshoe hares.

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Winter Behavior Of The Eastern Box Turtle, Terrapene C. Carolina L., In Eastern Tennessee, Richard A. Dolbeer Jan 1970

Winter Behavior Of The Eastern Box Turtle, Terrapene C. Carolina L., In Eastern Tennessee, Richard A. Dolbeer

United States Department of Agriculture Wildlife Services: Staff Publications

A field study of winter movements and depths and types of hibernacula of the eastern box turtle, Terrapene carolina carolina L., was undertaken from October 1968-January 1969.

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