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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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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 further (San
Authors
T. Yamamoto, C.K. Arakawa, W.N. Batts, J. R. Winton
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%. The a
Authors
K. Titus, M.R. Fuller, J.L. Ruos
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 for this
Authors
Meridee Jones-Cecil, Anthony J. Crone
Correlation of Miocene flows of the Columbia River Basalt Group from the central Columbia River Plateau to the coast of Oregon and Washington
Nearly twenty flows of the Columbia River Basalt Group (CRBG) can be paleomagnetically and chemically correlated westward as far as 500 km from the Columbia Plateau in Washington, through the Columbia Gorge, to the Coast Range of Oregon and Washington. In the Coast Range near Cathlamet, Washington, the CRBG flow stratigraphy includes 10 flows of Grande Ronde Basalt (1 low-MgO R2 flow, 6 low-MgO N2
Authors
Ray E. Wells, R. W. Simpson, R. D. Bentley, Melvin H. Beeson, Margaret T. Mangan, Thomas L. Wright
Current status of the Puerto Rican parrot conservation program
No abstract available.
Authors
G.D. Lindsey, M.K. Brock, M.H. Wilson
Depositional facies, petrofacies, and diagenesis of siliciclastics of Morrow and Springer rocks, Anadarko Basin, Oklahoma
Investigations of 6,500 ft of core and -100 thin-sectioned core samples from 30 drill holes from the Oklahoma Panhandle to the southeast part of the Anadarko basin, Oklahoma, have led to the recognition of three depositional facies of the Springer and Morrow Formations of Mississippian and Pennsylvanian age, as recognized by geologists working in the subsurface of the Midcontinent region. Lithofac
Authors
C. William Keighin, Romeo M. Flores
Diagenesis of hydrocarbon-bearing rocks in the Middle Ordovician Simpson Group, southeastern Anadarko Basin, Oklahoma
Quartzarenites and subarkoses in the Middle Ordovician Simpson Group in the Gulf Costello No. 1 and Sunray-DX Parker No. 1 Mazur wells, southeastern Anadarko basin, have undergone a complex diagenetic and petroleum-migration history. During early burial, petroleum migrated locally through sandstones; patches of bitumen in calcite and bitumen-lined quartz overgrowths containing oil-bearing inclusio
Authors
Janet K. Pitman, Robert A. Burruss
Distribution, status, and biogeography of the West Indian manatee
No abstract available.
Authors
L.W. Lefebvre, T. J. O'Shea, G. B. Rathbun, R.C. Best
Environmental contaminants and diving ducks in San Francisco Bay
Concentrations of selenium, mercury, and cadmium were measured in surf scoters in San Francisco Bay to assess possible effects of contaminants on health or reproduction of diving ducks.
Authors
H. M. Ohlendorf, Katherine C. Marois, Roy W. Lowe, T.E. Harvey, P.R. Kelly
Falcons
Four species of Falco occur in the northeastern United States. The gyrfalcon is a rare winter visitor. The peregrine falcon federally listed as endangered, is a migrant and through reestablishment is breeding and wintering locally throughout the northeast. The merlin is a migrant and uncommon winter bird. The American kestrel breeds, winters, and migrates in the northeast. A 22-year analysis
Authors
L.S. Schueck, M.R. Fuller, W.S. Seegar