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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: 6164
Random effects and shrinkage estimation in capture-recapture models Random effects and shrinkage estimation in capture-recapture models
We discuss the analysis of random effects in capture-recapture models, and outline Bayesian and frequentists approaches to their analysis. Under a normal model, random effects estimators derived from Bayesian or frequentist considerations have a common form as shrinkage estimators. We discuss some of the difficulties of analysing random effects using traditional methods, and argue that a
Authors
J. Andrew Royle, W.A. Link
Reconstruction of Anacostia wetlands: success? Reconstruction of Anacostia wetlands: success?
Historically, the tidal Anacostia River in Washington, D.C. had been an extensive system of freshwater tidal marshes replete with a full array of wetland vegetation dominated by wild rice. The local Nacochtank Indians had found the abundant fish and wildlife sufficient to sustain their daily lives. White man's intrusion upon the landscape gradually brought about deterioration of the...
Authors
R.S. Hammerschlag
Series forward Series forward
No abstract available.
Authors
J.M. Weeks, S. O’Hare, Barnett A. Rattner
Sources, fate, and effects of PAHs in shallow water environments: a review with special reference to small watercraft Sources, fate, and effects of PAHs in shallow water environments: a review with special reference to small watercraft
Polycyclic aromatic hydrocarbons (PAHs) are aromatic hydrocarbons with two to seven fused carbon (benzene) rings that can have substituted groups attached. Shallow coastal, estuarine, lake, and river environments receive PAHs from treated wastewater, stormwater runoff, petroleum spills and natural seeps, recreational and commercial boats, natural fires, volcanoes, and atmospheric...
Authors
P.H. Albers
Statistical concepts: Assessing spatial distributions Statistical concepts: Assessing spatial distributions
Contents: -- Presence-absence surveys -- Mapping the spatial distribution -- Looking ahead -- References
Authors
J.D. Nichols, K. U. Karanth
Statistical concepts: Estimating absolute densities of tigers using capture-recapture sampling Statistical concepts: Estimating absolute densities of tigers using capture-recapture sampling
Contents: -- Introduction -- Photo trapping tigers -- Capture-recapture models -- Survey design considerations -- Conclusion -- References
Authors
J.D. Nichols, K. U. Karanth
Statistical concepts: Indices of relative abundance Statistical concepts: Indices of relative abundance
Contents: -- Kinds of indices -- Reducing bias in index-based estimates -- Robust estimation of relative abundance -- Summary comments on indices and estimation -- References
Authors
J.D. Nichols, K. U. Karanth
Statistical mapping of count survey data Statistical mapping of count survey data
We apply a Poisson mixed model to the problem of mapping (or predicting) bird relative abundance from counts collected from the North American Breeding Bird Survey (BBS). The model expresses the logarithm of the Poisson mean as a sum of a fixed term (which may depend on habitat variables) and a random effect which accounts for remaining unexplained variation. The random effect is assumed...
Authors
J. Andrew Royle, W.A. Link, J.R. Sauer
Structural-group quantitation by CP/MAS 13C NMR measurements of dissolved organic matter from natural waters Structural-group quantitation by CP/MAS 13C NMR measurements of dissolved organic matter from natural waters
No abstract available.
Authors
R.L. Wershaw, George R. Aiken, J. A. Leenheer, J. Tregellas