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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: 6197
Design of Amphibian Surveys Design of Amphibian Surveys
No abstract available at this time
Authors
Gary M. Fellers
Development of an IBI-based assessment of depressional wetlands in Maryland and Delaware Development of an IBI-based assessment of depressional wetlands in Maryland and Delaware
The hydrogeomorphic approach (HGM) of wetland assessment emphasizes functional components of wetlands such as water storage, transformation and cycling of elements, accumulation of sediments, and preservation of habitats. Many of the elements measured in HGM are physical rather than ecological or biological. The HGM approach, therefore, provides information on certain aspects of wetlands...
Authors
D. W. Sparling, Michael Keller, T. P. Lowe, M. Perry, B. Teels, L. Brown, L. Mazanti, N. Melvin
Early growth of roseate terns chicks as an index of parental quality Early growth of roseate terns chicks as an index of parental quality
No abstract available.
Authors
I.C.T. Nisbet, J. A. Spendelow, Jeff S. Hatfield, G. Gough, James M. Zingo
Ecotoxicology of aluminum to fish and wildlife Ecotoxicology of aluminum to fish and wildlife
The toxicity of aluminum has been studied extensively in fish, less so in invertebrates, amphibians, and birds, and not at all in reptiles and free-ranging mammals. For aquatic organisms, Al bioavailability and toxicity are intimately related to ambient pH; changes in ambient acidity may affect Al solubility, dissolved Al speciation, and organism sensitivity to Al. At moderate acidity...
Authors
D. W. Sparling, T. P. Lowe, P.G.C. Campbell
Effectiveness of mitigation measures with constructed forested wetlands in Maryland Effectiveness of mitigation measures with constructed forested wetlands in Maryland
Intensive research on six constructed forested wetlands in Central Maryland was conducted in 1993-1996 to determine success of these habitats as functional forested wetlands for wildlife. Areas studied ranged in size from 2 to 35 acres and were constructed by private companies under contract with three mitigation agencies. Adjacent natural forested wetlands were used as reference sites...
Authors
Matthew C. Perry
Effects of fire on bird populations in mixed-grass prairie Effects of fire on bird populations in mixed-grass prairie
The mixed-grass prairie is one of the largest ecosystems in North America, originally covering about 69 million ha (Bragg and Steuter 1995). Although much of the natural vegetation has been replaced by cropland and other uses (Samson and Knopf 1994, Bragg and Steuter 1995), significant areas have been preserved in national wildlife refuges, waterfowl production areas, state game...
Authors
Douglas H. Johnson
Effects of flooding croplands in winter on water quality in the Mississippi delta Effects of flooding croplands in winter on water quality in the Mississippi delta
No abstract available.
Authors
S.W. Manley, R.M. Kaminski, S.H. Schoenholtz, P. Rodrigue, K. J. Reinecke
Effects of harvest restrictions on black duck harvest and populations trends Effects of harvest restrictions on black duck harvest and populations trends
No abstract available.
Authors
J.R. Serie, R.E. Trost, J.R. Sauer
Embryology, incubation, and hatching Embryology, incubation, and hatching
No abstract available.
Authors
Glenn H. Olsen, S.L. Clubb
Epithermal mercury-antimony and gold-bearing vein lodes of southwestern Alaska Epithermal mercury-antimony and gold-bearing vein lodes of southwestern Alaska
Epithermal mineral deposits and occurrences of southwestern Alaska consist of Hg-Sb and gold- and sulfide-bearing vein lodes. Numerous Hg-Sb lodes are located throughout a region measuring several tens of thousands of square kilometers in and surrounding the Kuskokwim River basin in southwestern Alaska. The Hg-Sb lodes are hosted in sedimentary rocks of the Cretaceous Kuskokwim Group...
Authors
John E. Gray, Carol A. Gent, Lawrence W. Snee, Frederic H. Wilson