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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.
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: 6151
Relationships between nesting populations of wading birds and habitat features along the Atlantic Coast Relationships between nesting populations of wading birds and habitat features along the Atlantic Coast
Using previously published atlas data for 122 mixed-species wading bird colonies on islands along the Atlantic coast (Maine to Florida, 1976-77), we examined relationships between population sizes of 11 species of egrets, herons, ibises, and wood storks (Mycteria americana) and nine habitat variables. On nautical charts, we measured four island characteristics (area, length, width, shape...
Authors
R.M. Erwin, J. A. Spendelow, P.H. Geissler, B. Kenneth Williams
Resource assessments, geologic deposit models, and offshore minerals with an example of heavy-mineral sands Resource assessments, geologic deposit models, and offshore minerals with an example of heavy-mineral sands
A resource assessment method for offshore minerals based on descriptive and grade-tonnage models is proposed. Historical development and applications of this method are summarized. Based on this approach, descriptive and quantitative deposit models for strand-line titanium placer deposits have been developed. Descriptive statistics were also computed using the worldwide deposit data set...
Authors
Emil D. Attanasi, J. H. DeYoung, E. R. Force, Andrew Grosz
Resurrection Peninsula and Knight Island ophiolites and recent faulting on Montague Island, southern Alaska Resurrection Peninsula and Knight Island ophiolites and recent faulting on Montague Island, southern Alaska
The Resurrection Peninsula forms the east side of Resurrection Bay (Fig. 1). The city of Seward is located at the head of the bay and can be reached from Anchorage by highway (127 mi;204 km). Relief ranges from 1,434 ft (437 m) at the southern end of the peninsula to more than 4,800 ft (1,463 m) 17 mi (28 km) to the north. All rock units composing the informally named Resurrection...
Authors
Steven W. Nelson, Marti L. Miller, Julie A. Dumoulin
Seasonal metabolic and reproductive cycles in wolves Seasonal metabolic and reproductive cycles in wolves
No abstract available.
Authors
U.S. Seal, E.D. Plotka, L.D. Mech, J.M. Packard
Telemetry of gastric motility data from owls Telemetry of gastric motility data from owls
No abstract available.
Authors
V.B. Kuechle, M.R. Fuller, R.A. Reichle, R.J. Schuster, G.E. Duke
Territorial aspects of barred owl home range and behavior in Minnesota Territorial aspects of barred owl home range and behavior in Minnesota
No abstract available.
Authors
T.H. Nicholls, M.R. Fuller
The adaptive radiation of photosynthetic modes in the genus Isoetes (Isoetaceae) The adaptive radiation of photosynthetic modes in the genus Isoetes (Isoetaceae)
No abstract available at this time
Authors
Jon E. Keeley
The use of kestrels in toxicology The use of kestrels in toxicology
Various species of kestrels have become important bioindicators of environmental quality and test species for comparative toxicology in captivity. At least 7 species of kestrels have been used to document the presence of environmental contamination primarily organochlorines and metals, in at least 15 countries. Captive kestrels have been used in studies involving a wide variety of...
Authors
Stanley N. Wiemeyer, J.L. Lincer
Trends in American kestrel counts from the North American Breeding Bird Survey Trends in American kestrel counts from the North American Breeding Bird Survey
A 15-year summary of the BBS data suggests that continental numbers of American Kestrels have increased during 1966-1979. According to analyses of physiographic and state/province strata, some areas are largely responsible for the increase in the U.S. and southern Canada and that only in Illinois and Arkansas have kestrels declined. BBS data are too few in Florida to detect trends...
Authors
M.R. Fuller, D. Bystrak, C.S. Robbins, R.M. Patterson
Trophic levels and trophic relationships of seabirds in the Gulf of Alaska Trophic levels and trophic relationships of seabirds in the Gulf of Alaska
No abstract available.
Authors
G.A. Sanger