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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.
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
Organochlorine pollutants in plasma of spring migrant peregrine falcons from coastal Texas, 1984 Organochlorine pollutants in plasma of spring migrant peregrine falcons from coastal Texas, 1984
No abstract available.
Authors
Charles J. Henny, K.E. Riddle, C.S. Hulse
Organochlorines in Alaskan peregrine falcon eggs and their current impact on productivity Organochlorines in Alaskan peregrine falcon eggs and their current impact on productivity
No abstract available.
Authors
Robert E. Ambrose, Charles J. Henny, R. E. Hunter, J.A. Crawford
Ornitologia. Preliminary Field Report Ornitologia. Preliminary Field Report
No abstract available.
Authors
M.S. Foster
Overview of nongame bird survey techniques Overview of nongame bird survey techniques
No abstract available.
Authors
C.S. Robbins
Peregrine falcon Peregrine falcon
Since 1975, 101 peregrine falcon breeding sites have been documented in Arizona, New Mexico and western Texas. Eyries were found in either riverine or montane canyons, habitats which supported dense and diverse avian prey and provided structural characteristics that may increase prey vulnerability. Approximately 85% of the sites visited each year were occupied. Egg-laying (mid-February...
Authors
R.W. Skaggs, D. H. Ellis, W.G. Hunt, T.H. Johnson
Persistent toxic substances and the health of fish communities in the Great Lakes Persistent toxic substances and the health of fish communities in the Great Lakes
The role, if any, of toxic substances in bringing about changes in the productivity and status of fishery resources, is not well understood. At the 'Workshops on Persistent Toxic Substances and the Health of the Aquatic Community,' the Fish Biota Discussion Subgroup considered the issue of toxic substances by responding to the three questions addressed to it by the Workshop Organizing...
Authors
Wayne A. Willford
Population estimates for the peregrine falcon in Arizona: A habitat inventory approach 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 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