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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.
Filter Total Items: 6158
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
Fire Effects on the Point Reyes Mountain Beaver (Aplodontia rufa phaea) Fire Effects on the Point Reyes Mountain Beaver (Aplodontia rufa phaea)
No abstract available at this time
Authors
Gary M. Fellers, David Pratt, Jennifer L. Griffin
Food selection among Atlantic Coast seaducks in relation to historic food habits Food selection among Atlantic Coast seaducks in relation to historic food habits
Food selection among Atlantic Coast seaducks during 1999-2005 was determined from hunter-killed ducks and compared to data from historic food habits file (1885-1985) for major migrational and wintering areas in the Atlantic Flyway. Food selection was determined by analyses of the gullet (esophagus and proventriculus) and gizzard of 860 ducks and summarized by aggregate percent for each...
Authors
Matthew C. Perry, P.C. Osenton, A. M. Wells-Berlin, D.M. Kidwell
Forest management under uncertainty for multiple bird population objectives Forest management under uncertainty for multiple bird population objectives
We advocate adaptive programs of decision making and monitoring for the management of forest birds when responses by populations to management, and particularly management trade-offs among populations, are uncertain. Models are necessary components of adaptive management. Under this approach, uncertainty about the behavior of a managed system is explicitly captured in a set of...
Authors
C. T. Moore, W.T. Plummer, M.J. Conroy