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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
Comparison of traditional and molecular methods for detection of Renibacterium salmoninarum Comparison of traditional and molecular methods for detection of Renibacterium salmoninarum
Bacterial kidney disease (BKD) caused by Renibacterium salmoninarum occurs in most parts of the world where wild or cultured salmonid fishes are present. Several extensive reviews have been written on the pathogen and the disease (Fryer and Sanders, 1981; Austin and Austin, 1987; Elliott et al., 1989; Evelyn, 1993; Evenden et al., 1993; Fryer and Lannan, 1993). Bacterial kidney disease...
Authors
R.J. Pascho, D.G. Elliott, D.M. Chase
Conducting regional environmental assessments: the Southern Appalachian experience Conducting regional environmental assessments: the Southern Appalachian experience
No abstract available.
Authors
C.W. Berish, B.R. Durbrow, J. E. Harrison, W.A. Jackson, K.H. Riitters
Contaminants without borders: A regional assessment of the Colorado River Delta ecosystem Contaminants without borders: A regional assessment of the Colorado River Delta ecosystem
The Colorado River Delta Region (CRDR) is comprised of large agricultural areas in the U.S. (Imperial and Yuma districts) and Mexico (Mexicali and San Luis districts), the Salton Sea, and the Lower Colorado River from southern Arizona to the Gulf of California (Valdés-Casillas et al., 1998). Before agricultural development, the lower delta comprised large riparian and wetland areas...
Authors
Miguel A. Mora, Jaqueline Garcia, Maria de la Paz Carpio-Obeso, Kirke A. King
Contrasting determinants of abundance in ancestral and colonized ranges of an invasive brood parasite Contrasting determinants of abundance in ancestral and colonized ranges of an invasive brood parasite
Avian species distributions are typically regarded as constrained by spatially extensive variables such as climate, habitat, spatial patchiness, and microhabitat attributes. We hypothesized that the distribution of a brood parasite depends as strongly on host distribution patterns as on biophysical factors and examined this hypothesis with respect to the national distribution of the...
Authors
D.C. Hahn, R.J. O’Connor
Economic and ecological impacts of abrupt climate change Economic and ecological impacts of abrupt climate change
Most studies of the potential ecological and economic impacts of climate change and greenhouse warming have focused on scenarios that involve gradual climate change. Accumulating evidence from the paleosciences, however, shows that the patterns of change suggested by projections of future climate change are not representative of past climatic changes or of the transitions between...
Authors
Effects of fire and post-fire salvage logging on avian communities in conifer-dominated forests of the western United States Effects of fire and post-fire salvage logging on avian communities in conifer-dominated forests of the western United States
Historically, fire was one of the most widespread natural disturbances in the western United States. More recently, however, significant anthropogenic activities, especially fire suppression and silvicultural practices, have altered fire regimes; as a result, landscapes and associated communities have changed as well. Herein, we review current knowledge of how fire and postfire salvaging...
Authors
N.B. Kotliar, S.J. Hejl, R.L. Hutto, V. Saab, Cynthia Melcher, M.E. McFadzen
Evaluation of genetic variability in a small, insular population of spruce grouse Evaluation of genetic variability in a small, insular population of spruce grouse
Using microsatellite markers we determined genetic variability for two populations of spruce grouse in eastern North America, one on a coastal Maine island where breeding habitat is limited and highly fragmented, the other in central New Brunswick (NB), where suitable breeding habitat is generally contiguous across the region. We examined six markers for both populations and all were...
Authors
A.F. O'Connell, Judith Rhymer, D.M. Keppie, K.L. Svenson, B.J. Paigan
Field surveys: Estimating absolute densities of tigers using capture-recapture sampling Field surveys: Estimating absolute densities of tigers using capture-recapture sampling
Contents: -- Introduction -- Choice of camera trap equipment -- Conducting camera trap surveys -- Analysis of capture-recapture data -- References
Authors
K. U. Karanth, S. Kumar, J.D. Nichols