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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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Distribution and nature of fault architecture in a layered sandstone and shale sequence: An example from the Moab fault, Utah Distribution and nature of fault architecture in a layered sandstone and shale sequence: An example from the Moab fault, Utah
We examined the distribution of fault rock and damage zone structures in sandstone and shale along the Moab fault, a basin-scale normal fault with nearly 1 km (0.62 mi) of throw, in southeast Utah. We find that fault rock and damage zone structures vary along strike and dip. Variations are related to changes in fault geometry, faulted slip, lithology, and the mechanism of faulting. In...
Authors
N.C. Davatzes, A. Aydin
Distribution of pelagic forage fishes in relation to the oceanography of Glacier Bay Distribution of pelagic forage fishes in relation to the oceanography of Glacier Bay
No abstract available.
Authors
Mayumi L. Arimitsu, John F. Piatt, Marc D. Romano, David C. Douglas
Drought monitoring techniques for famine early warning systems in Africa Drought monitoring techniques for famine early warning systems in Africa
No abstract available.
Authors
James D. Rowland, J. P. Verdin, A. Adoum, G.B. Senay
Emperor Goose Anser canagicus Emperor Goose Anser canagicus
No abstract available.
Authors
Joel A. Schmutz
Estimating population abundance and mapping distribution of wintering sea ducks in coastal waters of the mid-Atlantic Estimating population abundance and mapping distribution of wintering sea ducks in coastal waters of the mid-Atlantic
Survey design for wintering scoters (Melanitta sp.) and other sea ducks that occur in offshore waters is challenging because these species have large ranges, are subject to distributional shifts among years and within a season, and can occur in aggregations. Interest in winter sea duck population abundance surveys has grown in recent years. This interest stems from concern over the...
Authors
M.D. Koneff, J. Andrew Royle, D.J. Forsell, J.S. Wortham, G.S. Boomer, Matthew C. Perry
Estimating the number of animals in wildlife populations Estimating the number of animals in wildlife populations
INTRODUCTION In 1938, Howard M. Wight devoted 9 pages, which was an entire chapter in the first wildlife management techniques manual, to what he termed 'census' methods. As books and chapters such as this attest, the volume of literature on this subject has grown tremendously. Abundance estimation remains an active area of biometrical research, as reflected in the many differences...
Authors
R.A. Lancia, W. L. Kendall, K. H. Pollock, J.D. Nichols
Estimation of inorganic species aquatic toxicity Estimation of inorganic species aquatic toxicity
The acute aquatic toxicities (narcoses) for a range of organism types may be estimated with LSER for a large number of inorganic and organometal species, many with an accuracy at or within an order of magnitude. Optimum estimations make use of a bioavailable metal fraction and a more accurate structure(s) for the toxic solution species. The estimated toxicities for a number of salts were...
Authors
James P. Hickey
Evaluating calling surveys Evaluating calling surveys
No abstract available.
Authors
Sam Droege, P. Eagle
Examples Examples
No abstract available.
Authors
Trent L. McDonald, Steven C. Amstrup, Eric V. Regehr, Bryan F.J. Manly
Factors limiting the recovery of boreal toads (Bufo b. boreas) Factors limiting the recovery of boreal toads (Bufo b. boreas)
Boreal toads (Bufo b. boreas) are widely distributed over much of the mountainous western United States. Populations in the Southern Rocky Mountains suffered extensive declines in the late 1970s through early 1980s (Carey, 1993). At the time, these mass mortalities were thought to be associated with a bacterial infection (Carey, 1993). Although the few populations that survived the mass...
Authors
C. Carey, P.S. Corn, M.S. Jones, L.J. Livo, E. Muths, C.W. Loeffler
Fecal corticoid monitoring in whooping cranes trained to follow ultralight aircraft Fecal corticoid monitoring in whooping cranes trained to follow ultralight aircraft
The use of fecal corticoid assays to measure stress in North American cranes has been limited to laboratory validation and a single field project involving reintroduced sandhill cranes (Ludders et aI., 1998, 2001; Hartup et aI., 2004). In 2001, we documented trends in corticoid concentrations among a cohort of ten costume-reared whooping cranes subjected to ultralight aircraft training...
Authors
B.K. Hartup, Nancy M. Czekala, Glenn H. Olsen, J.A. Langenberg