Book Chapters
Science Quality and Integrity
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: 6063
Macrophage aggregates: biomarker for immune function in fishes?
No abstract available at this time
Authors
V. S. Blazer, J.W. Fournie, B. A. Weeks-Perkins
Management of an endangered species: the black-footed ferret
No abstract available.
Authors
D. E. Biggins, B. J. Miller, T. W. Clark, R.P. Reading
Modeling the population dynamics of Gulf Coast sandhill cranes
The Midcontinental population of sandhill cranes (Grus canadensis) has a large geographic range, contains nearly 500,000 birds, and is hunted in much of its range. The population includes three subspecies; the numbers of two of these are uncertain, and they should be afforded protection from hunting that would be detrimental to their population. The two subspecies of concern tend to concentrate
Authors
D. H. Johnson, W. L. Kendall
Monitoring Canadian bird populations with winter counts
Two winter bird surveys in Canada have range-wide population monitoring potential: Christmas Bird Counts (CBCs) and Project FeederWatch (PFW). CBC trends are shown to be correlated to Breeding Bird Survey (BBS) trends, whether or not part of the winter range lies outside the CBC coverage area. Some species are poorly covered by this survey (e.g. seabirds, nocturnal species, and Neotropical migra
Authors
Erica H. Dunn, J.R. Sauer
Multispecies lottery competition: a diffusion analysis
The lottery model is a stochastic competition model designed for space-limited communities of sedentary organisms. Examples of such communities include coral reef fishes, aquatic sessile organisms, and many plant communities. Explicit conditions for the coexistence of two species and the stationary distribution of the two-species model were determined previously using an approximation with a dif
Authors
J. S. Hatfield, P.L. Chesson
Natural chemical attenuation of halogenated hydrocarbon compounds via dehalogenation
No abstract available
Authors
M. Reinhard, G.P. Curtis, Jack E. Barbash
Optimal management strategies for biodiversity within a powerline right-of-way
Management techniques used to control vegetation along a new 8.5 km- (5.3 mile) long powerline right-of-way located at Patuxent Research Refuge are being evaluated to identify changes in habitat that affect wildlife. Techniques include: complete mow, strip mow, low volume foliar spray, selective basal spray, and tree topping. One hundred and one bird species were recorded during line transect sa
Authors
M. C. Perry, P.C. Osenton, F.W. Fallon, J.E. Fallon
Pesticides and volatile organic compounds in shallow urban groundwater of the United States
The widespread use of pesticides and volatile organic compounds (VOCs) over the past half century has led to their detection in many hydrologic systems in the United States. However, few systematic investigations of occurrences have been carried out over multistate regions using a consistent study design. Nine urban studies of shallow groundwater have been conducted to date as part of the U.S. Geo
Authors
Dana W. Kolpin, Paul J. Squillace, John S. Zogorski, Jack E. Barbash
Population genetic studies of the polar bear (Ursus maritimus): A summary of available data and interpretation of results
A summary of existing population genetics literature is presented for polar bears (Ursus maritimus) and interpreted in the context of the species' life-history characteristics and regional heterogeneity in environmental regimes and movement patterns. Several nongenetic data sets including morphology, contaminant levels, geographic variation in reproductive characteristics, and the location and dis
Authors
Kim T. Scribner, G.W. Garner, Steven C. Amstrup, M.A. Cronin
Population genetics studies of the walrus (Odobenus rosmarus): A summary and interpretation of results and research needs
A summary of population genetics data is presented for the walrus (Odobenus rosmarus). Current information on the ecology and behavior of the species is highlighted to aid in the interpretation of genetics results and to suggest future areas of research. Walruses are discontinuously distributed across the Arctic and are currently subdivided into six regional populations on the basis of historical
Authors
Kim T. Scribner, Susan Hills, Steven R. Fain, Matthew A. Cronin