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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.
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Bald eagle and osprey Bald eagle and osprey
Bald eagles nested in all nine western states during recent years (about 19% of known U.S. population in 1982). The known numbers of nesting pairs in the west increased substantially in the last 10 years and totaled 584 in 1986. Much of the increase was due to more intensive survey efforts, but most biologists cite examples of new palrs establishing nesting territories. In contrast...
Authors
Charles J. Henny, R.G. Anthony
Bioaccumulation and effects of selenium in wildlife Bioaccumulation and effects of selenium in wildlife
No abstract available.
Authors
H. M. Ohlendorf
Buteos Buteos
Red-tailed, red-shouldered, and broad-winged hawks nest throughout the 11 northeastern states, and red-tailed, red-shouldered, and rough-legged hawks winter in this region. Historical and present ranges of these species are similar, although red-shouldered and broad-winged hawk ranges now have more vacant patches at a local and regional level. Only the red-shouldered hawk is of special...
Authors
K. Titus, M.R. Fuller, D.F. Stauffer, J.R. Sauer
Census and survey techniques for shorebirds Census and survey techniques for shorebirds
No abstract available.
Authors
M.A. Howe
Census/survey methods: Colonial waterbirds Census/survey methods: Colonial waterbirds
No abstract available.
Authors
R.M. Erwin
Census/survey techniques for songbirds Census/survey techniques for songbirds
No abstract available.
Authors
C.S. Robbins
Characterization and origin of natural gases of the Anadarko Basin Characterization and origin of natural gases of the Anadarko Basin
Natural-gas production in the Anadarko basin is from three geographically separated areas that can be differentiated by age of reservoir and by inferred nature of thermal origin of the gases. In the central basin, nonassociated gases are produced mainly from Upper Mississippian and Pennsylvanian sandstones. Gases become isotopically heavier (δ13C1 values range from -49.8 to -33.2 ppt)...
Authors
Dudley D. Rice, Charles N. Threlkeld, April K. Buletich
Chronic no-observed-effect concentrations of aluminum for brook trout exposed in low-calcium, dilute acidic water Chronic no-observed-effect concentrations of aluminum for brook trout exposed in low-calcium, dilute acidic water
No abstract available.
Authors
L. Cleveland, E. E. Little, Ray H. Wiedmeyer, D.R. Buckler
Climate variability in an estuary: Effects of riverflow on San Francisco Bay Climate variability in an estuary: Effects of riverflow on San Francisco Bay
A simple conceptual model of estuarine variability in the context of climate forcing has been formulated using up to 65 years of estimated mean-monthly delta flow, the cumulative freshwater flow to San Francisco Bay from the Sacramento-San Joaquin River, and salinity observations near the mouth, head, mid-estuary, and coastal ocean. Variations in delta flow, the principal source of...
Authors
David H. Peterson, Daniel R. Cayan, John F. Festa, Frederic H. Nichols, Roy A. Walters, James V. Slack, Stephen E. Hager, Laurence E. Schemel
Comparison of infectious hematopoietic necrosis in natural and experimental infections of spawning salmonids by infectivity and immunohistochemistry Comparison of infectious hematopoietic necrosis in natural and experimental infections of spawning salmonids by infectivity and immunohistochemistry
Infectious hematopoietic necrosis (IHN) continues to be a serious virus disease of salmonids with epizootics recorded in both wild and hatchery populations (Williams and Amend 1976; Carlisle et al 1979; Groberg and Fryer 1983; Saft and Pratt 1986; Traxler 1987; Follett et al 1987; Meyers et al 1988). While originally enzootic in western North America, the virus appears to be spreading...
Authors
T. Yamamoto, C.K. Arakawa, W.N. Batts, J. R. Winton
Considerations for monitoring raptor population trends based on counts of migrants Considerations for monitoring raptor population trends based on counts of migrants
Various problems were identified with standardized hawk count data as annually collected at six sites. Some of the hawk lookouts increased their hours of observation from 1979-1985, thereby confounding the total counts. Data recording and missing data hamper coding of data and their use with modern analytical techniques. Coefficients of variation among years in counts averaged about 40%...
Authors
K. Titus, M.R. Fuller, J.L. Ruos
Constraints on the Anadarko Basin-Wichita uplift boundary interpreted from aeromagnetic data Constraints on the Anadarko Basin-Wichita uplift boundary interpreted from aeromagnetic data
Modeling and interpretation of aeromagnetic data across the transition between the Anadarko basin and the Wichita uplift in the vicinity of the scarp on the Meers fault (Fig. 1) constrains structural relationships and lithologic contrasts at this boundary. We digitized aeromagnetic data from the map based on a detailed survey flown in 1954 (U.S. Geological Survey, 1975). The flight lines...
Authors
Meridee Jones-Cecil, Anthony J. Crone