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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: 6198
Baseline hematology and clinical chemistry results from captive-raised trumpeter swans Baseline hematology and clinical chemistry results from captive-raised trumpeter swans
Results from hematology and clinical chemistry tests are presented for healthy captive-raised Trumpeter Swans (Cygnus buccinator) to help establish baseline data. Blood samples were obtained from 14 cygnets between the ages of three to four and seven to eight months that were the subjects of a study to teach migration routes to swans. Males and females differed significantly in...
Authors
Glenn H. Olsen, D.L. Rininger, M.K. Ets, William J.L. Sladen
Behavioral measures of environmental stressors in fish Behavioral measures of environmental stressors in fish
No abstract available.
Authors
Edward E. Little
Breeding productivity of Smith Island black ducks Breeding productivity of Smith Island black ducks
We investigated the breeding performance of American black ducks (Anas rubripes) on Smith Island, Chesapeake Bay, to improve our understanding of island black duck breeding ecology and to make management recommendations to enhance productivity. During 1995-96, we implanted 56 female black ducks with 20-g radio transmitters and tracked 35 of the individuals through the breeding season to...
Authors
G.M. Haramis, Dennis G. Jorde, Glenn H. Olsen, Daniel B. Stotts, M.K. Harrison
Community food webs Community food webs
Community food webs describe the feeding relationships, or trophic interactions, between the species of an ecological community. Both the structure and dynamics of such webs are the focus of food web research. The topological structures of empirical food webs from many ecosystems have been published on the basis of field studies and they form the foundation for theory concerning the mean...
Authors
Donald L. DeAngelis
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