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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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Telemetry location error in a forested habitat
The error associated with locations estimated by radio-telemetry triangulation can be large and variable in a hardwood forest. We assessed the magnitude and cause of telemetry location errors in a mature hardwood forest by using a 4-element Yagi antenna and compass bearings toward four transmitters, from 21 receiving sites. The distance error from the azimuth intersection to known transmitter lo
Authors
D.S. Chu, B. A. Hoover, M.R. Fuller, P.H. Geissler
The effect of differential growth on spatial comparisons of copper content of a bivalve indicator
No abstract available.
Authors
D.J. Cain, J.K. Thompson, S. N. Luoma
The impact of eastern equine encephalitis virus on efforts to recover the endangered whooping crane
The whooping crane (Grus americana), although never abundant in North America, became endangered primarily because of habitat modification and destruction. To help recovery, a captive propagation and reintroduction program was initiated at the Patuxent Wildlife Research Center (PWRC) in 1966. However, in 1984, 7 of 39 whooping cranes at PWRC died from infection by eastern equine encephalitis (EE
Authors
J. W. Carpenter, G.G. Clark, D.M. Watts
The influence of north Pacific atmospheric circulation on streamflow in the west
The annual cycle and nonseasonal variability of streamflow over western North America and Hawaii is studied in terms of atmospheric forcing elements. This study uses several decades of monthly average streamflow beginning as early as the late 1800's over a network of 38 stations. In addition to a strong annual cycle in mean streamflow and its variance at most of the stations, there is also a dist
Authors
Daniel R. Cayan, David H. Peterson
The Resurrection Peninsula ophiolite
The Resurrection Peninsula forms the east side of Resurrection Bay (fig. 3). Relief ranges from 437 m (1,434 ft) at the southern end of the peninsula to more than 1,463 m (4,800 ft) opposite the head of the bay. All rock units composing the informally named Resurrection Peninsula ophiolite of Nelson and others (1987) are visible or accessible by boat."Ophiolite" has been a geologic term since 1827
Authors
Steven W. Nelson, Marti L. Miller, Julie A. Dumoulin
The shiny cowbird Molothrus bonariensis in the West Indian region--Biogeographical and ecological implications
The shiny cowbird (Molthrus bonariensis), an avian brood parasite, is endemic to South America, Trinidad, and Tobago, but during the last 100 years the species has spread through the West Indies. Successful colonization by the shiny cowbird depends on the availablitiy of suitable habitats and host species. As forest fragmentation increases in the West Indies, new hosts, particularly forest speci
Authors
A. Cruz, J. W. Wiley, T.K. Nakamura, W. Post
Thermal maturity of the Anadarko Basin
Levels of thermal maturity are estimated for Paleozoic strata in five areas of the central Anadarko basin for times between the Paleozoic and the present, and depths of the oil window are plotted as a function of geologic time. Mean surface temperature assumed here for calculating Lopatin's time-temperature index of thermal maturity (TTl) in the central Anadarko basin declines from 80°F (27°C) to
Authors
James W. Schmoker
Tidal and nontidal wetlands of northern Atlantic states
Summary of availability, habitat use, and management of waterfowl habitat during migration and winter in northern Atlantic states.
Authors
Dennis G. Jorde, J. R. Longcore, P.W. Brown
Turkey vulture and California condor
Populations of turkey vultures in the western states appear stable, with no evidence of recent significant changes in distribution. Turkey vultures occupy a variety of habitats, nest in diverse situations and utilize a wide variety of carrion. Consequently, no particular limiting factor is likely to have a major effect on the total population. California condor numbers, in contrast, have contin
Authors
O. H. Pattee, S.R. Wilbur
Uranium-series ages, faunal correlations and tectonic deformation of marine terraces within the Agua Blanca fault zone at Punta Banda, northern Baja California, Mexico
No abstract available.
Authors
T. K. Rockwell, D.R. Muhs, G. L. Kennedy, M.E. Hatch, S.M. Wilson, R.E. Klinger
Vegetation of wetlands of the prairie pothole region
Five themes dominate the literature dealing with the vegetation of palustrine and lacustrine wetlands of the prairie pothole region: environmental conditions (water or moisture regime, salinity), agricultural disturbances (draining, grazing, burning, sedimentation, etc.), vegetation dynamics, zonation patterns, and classification of the wetlands.The flora of a prairie wetland is a function of its
Authors
H.A. Kantrud, J.B. Millar, A.G. Van Der Valk