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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.
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PCBs and organochlorine pesticides in wild mink and river otters from Oregon PCBs and organochlorine pesticides in wild mink and river otters from Oregon
Mink (Mustela vison) and river otters (Lutra canadensis) collected during the 1978-1979 trapping season in Oregon were analyzed for organochlorine pesticide and polychlorinated biphenyl (PCB) residues. PCB residues were most frequently encountered in both species from the Lower Columbia River. PCB residues in 6 of 9 Columbia River mink livers were as high as those reported in livers of
Authors
Charles J. Henny, L. J. Blus, S.V. Gregory, C. J. Stafford
Pelagic distribution of marine birds in the Eastern Bering Sea Pelagic distribution of marine birds in the Eastern Bering Sea
Analyses of the most abundant marine bird species in the eastern Bering Sea indicate that their distribution and abundance are the result of complex interactions between biotic and abiotic elements of the environment. Of particular importance are the effects of ice systems, food availability, oceanographic frontal systems, and the location of suitable nesting sites. For most species, the...
Authors
G.L. Hunt, Gould D.M., D.J. Forsell, Petersen
Physical and chemical characteristics of warmwater streams: A review Physical and chemical characteristics of warmwater streams: A review
No abstract available.
Authors
P. V. Winger
Physiology of the eggshell thinning response to DDE Physiology of the eggshell thinning response to DDE
No abstract available.
Authors
S. Haseltine, T. Peterle, L. Nagode, A. Parsons, S. Lustick
Polychlorinated biphenyls in a wild mink population Polychlorinated biphenyls in a wild mink population
No abstract available.
Authors
T. J. O'Shea, T. E. Kaiser, G.R. Askins, J.A. Chapman
Problems in separating species with similar habits and vocalizations Problems in separating species with similar habits and vocalizations
The possibilities for species misidentification based on vocalization or habitat association are high. However, the magnitude of the errors actually perpetrated is generally within an acceptable range in most types of bird survey work. Examples of problems discussed are: congeners that are similar in appearance or in song (such as Chimney and Vaux's Swifts, Chaetura pelagica, C. vauxi...
Authors
C.S. Robbins, R.W. Stallcup
Reappraisal of the Winter Bird-Population Study technique Reappraisal of the Winter Bird-Population Study technique
Standardized morning and afternoon counts were conducted in two deciduous forest plots during seven winters. Morning counts yielded more species than afternoon counts, as well as higher counts of most species. A minimum of eight visits is recommended. Six visits yielded 2% to 5% fewer species, depending on the size and bird population of the study plot. Cumulative means for individual...
Authors
C.S. Robbins
Reducing bird count variability by training observers Reducing bird count variability by training observers
No abstract available.
Authors
C. B. Kepler, J. M. Scott
Refraction programs: four or fewer dipping seismic refractors--interpretation Refraction programs: four or fewer dipping seismic refractors--interpretation
No abstract available.
Authors
D. L. Campbell
Remarks on the use of mark-recapture methodology in estimating avian population size Remarks on the use of mark-recapture methodology in estimating avian population size
No abstract available.
Authors
J.D. Nichols, B.R. Noon, S.L. Stokes, J.E. Hines
Reproductive tests of diazinon on bobwhite quail Reproductive tests of diazinon on bobwhite quail
Diazinon was fed at sublethal levels to reproductively active bobwhite (Colinus virginianus). Thirty pairs were given constant concentrations (0, 35. 50, 72, 104, or 150 ppm) for 3 weeks (Constant group). Another 30 pairs (Pair-fed group) were matched to these by body weights and were fed the amounts of untreated food consumed by corresponding Constant pairs to evaluate the effect of...
Authors
K. L. Stromborg