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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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Population estimates for the peregrine falcon in Arizona: A habitat inventory approach
At least 50 pairs of peregrine falcons reside in Arizona. From aerial surveys of available habitat and occupancy trends at more than 600 sites searched from 1975 to 1985, we estimated that at least 90 pairs resided in the study area. We project a fully recovered population of at least 190 pairs.
Authors
D. H. Ellis, R.L. Glinski
Potential effects of changing water conditions on mallards wintering in the Mississippi alluvial valley
No abstract available.
Authors
K. J. Reinecke, R.C. Barkley, C.K. Baxter
Potential hazard for spread of infectious disease by transplantation of fish
No abstract available.
Authors
J. S. Rohovec, J. R. Winton, J. L. Fryer
Preface
No abstract available at this time
Authors
E. Kurkstak, Y. Kuroda, K. Maramorosch, D. P. Anderson
Preliminary Report, Herpetology Collections of Cerro de la Neblina
No abstract available.
Authors
R.W. McDiarmid, R. Cocroft, A. Paolillo
Presence and effects of Lyme disease in a barrier island deer population
No abstract available.
Authors
A.F. O'Connell, M. W. Sayre, E.M. Bosler
Raptors and aircraft
Less than 5% of all bird strikes of aircraft are by raptor species, but damage to airframe structure or jet engine dysfunction are likely consequences. Beneficial aircraft-raptor interactions include the use of raptor species to frighten unwanted birds from airport areas and the use of aircraft to census raptor species. Many interactions, however, modify the raptor?s immediate behavior and some ma
Authors
D.G. Smith, D. H. Ellis, T.H. Johnson
Riverine C, N, Si and P transport to the coastal ocean: An overview
Terrestrial ecosystems cycle and recyle inorganic nutrients including a feedback to atmospheric dry deposition and precipitation (cf. Lewis et al., 1985). Each year, however, a small fraction per unit area of the atmosphere/plant/soil flux leaks from these land-based cycles via precipitation/runoff (Meybeck, 1982). These losses are, in general, unpreventable. Moreover, such nutrient “losses” have
Authors
David H. Peterson, Stephen W. Hager, Laurence E. Schemel, Daniel R. Cayan
Sea otters, sea urchins, and kelp beds: some questions of scale
No abstract available.
Authors
J. A. Estes, C. Harrold
Sex specificity of behavioral dominance and fasting endurance in wintering canvasbacks: Experimental results
Hand-reared canvasbacks (Aythya valisineria) of varying sex ratios were maintained in pens during winter 1980-81 (3M-3F, 6M-0F, 0M-6F) and winter 1981-82 (4M-2F, 2M-4F) and fed two diets (control and stress). They were observed during feeding trials to determine intrasexual and intersexual aggressive activity. There was little evidence that either diet or sex ratio affected the total number of agg
Authors
M. C. Perry, J. D. Nichols, M.J. Conroy, H.H. Obrecht, B.K. Williams