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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: 6197
Population trends of black ducks and mallards from the North American Breeding Bird Survey: Are increases in mallards associated with declines in black ducks? Population trends of black ducks and mallards from the North American Breeding Bird Survey: Are increases in mallards associated with declines in black ducks?
No abstract available.
Authors
J.R. Sauer, Sam Droege
Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska Precious metals associated with Late Cretaceous-early Tertiary igneous rocks of southwestern Alaska
Placer gold and precious metal-bearing lode deposits of southwestern Alaska lie within a region 550 by 350 km, herein referred to as the Kuskokwim mineral belt. This mineral belt has yielded 100,240 kg (3.22 Moz) of gold, 12, 813 kg (412,000 oz) of silver, 1,377,412 kg (39,960 flasks) of mercury, and modest amounts of antimony and tungsten derived primarily from the late Cretaceous-early...
Authors
Thomas K. Bundtzen, Marti L. Miller
Reassessment of metals criteria for aquatic life protection Reassessment of metals criteria for aquatic life protection
No abstract available.
Authors
S. N. Luoma, Others
Recent numerical changes in North American roseate terns and their conjectured cause Recent numerical changes in North American roseate terns and their conjectured cause
No abstract available.
Authors
J.J. Hatch, J. A. Spendelow, J.D. Nichols, J.E. Hines
Reconsidering paradigms of overpopulation in ungulates: white-tailed deer at Saratoga National Historical Park Reconsidering paradigms of overpopulation in ungulates: white-tailed deer at Saratoga National Historical Park
No abstract available.
Authors
H.B. Underwood, W.F. Porter
Reproductive strategies for coping with poor conditions: responses of roseate terns to low food availability during the egg-laying period at Falkner Island, Connecticut Reproductive strategies for coping with poor conditions: responses of roseate terns to low food availability during the egg-laying period at Falkner Island, Connecticut
No abstract available.
Authors
J. A. Spendelow, James M. Zingo, Jeff S. Hatfield
Results of an experiment to lead cranes on migration behind motorized ground vehicles Results of an experiment to lead cranes on migration behind motorized ground vehicles
Ten greater sandhill cranes (Grus canadensis tabida), trained to enter and ride in a specially equipped truck, were transported at 80? days of age from their rearing site at Patuxent Wildlife Research Center (Patuxent), Maryland, to a reintroduction site located within the species? former breeding range in northern Arizona. After 5 additional weeks of training, these juvenile cranes were...
Authors
D. H. Ellis, B. Clauss, T. Watanabe, R.C. Mykut, M. Kinloch, Catherine H. Ellis
Semen collection and fertility in naturally fertile sandhill cranes Semen collection and fertility in naturally fertile sandhill cranes
Aviculturists often ask if semen collection will interfere with fertility in naturally fertile pairs of cranes. We used 12 naturally fertile Florida sandhill crane (Grus canadensis pratensis) pairs for this study, 6 control and 6 experimental. All pairs had produced fertile eggs in previous years and were in out-of-doors pens scattered throughout different pen complexes, within auditory...
Authors
G. Chen, G.F. Gee, Jane M. Nicolich, J.A. Taylor
Soil, plant, and structural considerations for surface barriers in arid environments: Application of results from studies in the Mojave Desert near Beatty, Nevada Soil, plant, and structural considerations for surface barriers in arid environments: Application of results from studies in the Mojave Desert near Beatty, Nevada
The suitability of a waste-burial site depends on hydrologic processes that can affect the near-surface water balance. In addition, the loss of burial trench integrity by erosion and subsidence of trench covers may increase the likelihood of infiltration and percolation, thereby reducing the effectiveness of the site in isolating waste. Although the main components of the water balance...
Authors
Brian J. Andraski, David E. Prudic
Status and restoration of the Etowah River, an imperiled Southern Appalachian Ecosystem Status and restoration of the Etowah River, an imperiled Southern Appalachian Ecosystem
Abstract not supplied at this time
Authors
N.M. Burkhead, S. J. Walsh, B. J. Freeman, J.D. Williams
Status of aquatic mollusks in the southeastern United States: a downward spiral of diversity Status of aquatic mollusks in the southeastern United States: a downward spiral of diversity
Abstract not supplied at this time
Authors
R. J. Neves, A.E. Bogan, J.D. Williams, S.A. Ahlstedt, P.D. Hartfield
Studies of sea ducks in the Atlantic flyway Studies of sea ducks in the Atlantic flyway
No abstract available.
Authors
D.G. Krementz, David F. Caithamer