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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse more than 5,500 book chapters authored by our scientists over the past 100+ year history of the USGS and refine search by topic, location, year, and advanced search.
Filter Total Items: 6152
Comparisons of winter bird populations in extensive neotropical forest and in isolated fragments Comparisons of winter bird populations in extensive neotropical forest and in isolated fragments
No abstract available.
Authors
C.S. Robbins, B.A. Dowell, D.K. Dawson, R. Coates-Estrada, J. Colon, F. Espinoza, J. Rodriguez, R. Sutton, T. Vargas, Dieter Weyer
Crested caracara Crested caracara
The crested caracara's range extends from the southern United States south to Tierra del Fuego. Although the caracara has been recorded in all of the southwestern states, it occurs regularly only in southern Arizona and central, southern and coastal Texas. Its distribution is closely linked to the availability of carrion. Throughout its range, thecaracara is associated with open habitats...
Authors
D. H. Ellis, D.G. Smith, W.H. Whaley, Catherine H. Ellis
Dabbling duck harvest dynamics in the Central Valley of California--implications for recruitment Dabbling duck harvest dynamics in the Central Valley of California--implications for recruitment
Age and sex ratios and body weights were obtained for northern pintails (Anas acuta), mallards (A. platyrhynchos), American wigeon (A. americana), green-winged teal (A. crecca), and northern shovelers (A. clypeata) shot at Mendota State Wildlife Area in the San Joaquin Valley (SANJV) and at Sacramento National Wildlife Refuge in the Sacramento Valley (SACV) during 1982-83 and 1983-84...
Authors
M. R. Miller, J. Beam, D.P. Connelly
Distribution and numbers of American black ducks along the Maine coast during the severe winter of 1980-1981 Distribution and numbers of American black ducks along the Maine coast during the severe winter of 1980-1981
No abstract available.
Authors
J. R. Longcore, J.P. Gibbs
Distribution and status of the peregrine falcon in South America Distribution and status of the peregrine falcon in South America
No abstract available.
Authors
J.W. McNutt, D. H. Ellis, C.P. Garat, T.B. Roundy, W.G. Vasina, C.M. White
Ecology of hydrilla in the Potomac 1985-1987 Ecology of hydrilla in the Potomac 1985-1987
No abstract available.
Authors
R.S. Hammerschlag
Environmental contaminants and the management of bat populations in the United States Environmental contaminants and the management of bat populations in the United States
Food-chain residues of organochlorine pesticides probably have been involved in declines of some U.S. bat populations; examples include free-tailed bats at Carlsbad Cavern, New Mexico, and the endangered gray bat at sites in Missouri and Alabama. If a long-lived contaminant has not been dispersed in large amounts over large areas, its impact may be controlled by administrative action...
Authors
D. R. Clark
Feeding ecology of canvasbacks staging on Pool 7 of the Upper Mississippi River Feeding ecology of canvasbacks staging on Pool 7 of the Upper Mississippi River
Foods consumed by canvasback ducks (Aythya valisineria), food availability, and energetic relationships were studied on Navigation Pool 7 of the upper Mississippi River in 1978, 1979, and 1980. Canvasbacks fed primarily upon winter buds of American wildcelery (Vallisneria americana) and tubers of stiff arrowhead (Sagittaria rigida). In 1980, waterfowl consumed 40% of 380,160 kg of...
Authors
C. E. Korschgen, L. S. George, W. L. Green
Ferruginous hawk Ferruginous hawk
In the Southwest, the ferruginous hawk is a local and isolated breeder and an uncommon but consistent winter visitor. Apparently, the breeding range of this species in the Southwest was historically much greater than today. The ferruginous hawk is being considered for listing by the U.S. Fish and Wildlife Service but remains unclassified by the individual states comprising the Southwest...
Authors
R.S. Hall, R.L. Glinski, D. H. Ellis, J.M. Ramakka, D.L. Base
Fish culture in the United States Fish culture in the United States
No abstract available at this time
Authors
N. C. Parker