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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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Some considerations in modeling the mallard life cycle
We outline a population model proposed to accommodate the full life cycle of the mallard (Anas platyrhynchos). Events during the breeding season are better understood than events at other times of the year, but recent findings suggest the importance of phenomena away from the breeding grounds. Several processes are discussed relative to mallard population dynamics. Compensatory mortality is a poor
Authors
D. H. Johnson, J. D. Nichols, M.J. Conroy, L.M. Cowardin
Some considerations in modeling the mallard life cycle
We outline a population model proposed to accommodate the full life cycle of the mallard (Anas platyrhynchos}. Events during the breeding season are better understood than events at other times of the year, but recent findings suggest the importance of phenomena away from the breeding grounds. Several processes are discussed relative to mallard population dynamics. Compensatory mortality is a poor
Authors
D. H. Johnson, J. D. Nichols, M.J. Conroy, L.M. Cowardin
Source-rock evaluation of outcrop samples from Vanuatu (Malakula, Espiritu Santo, Maewo, and Pentecost)
Thirty-nine outcrop samples of mudstones, siltstones, and limestones were collected for source-rock evaluation of the sedimentary column in Vanuatu. Twenty-nine samples showing the least evidence of oxidation were selected for total organic analysis from the Miocene Matanui Group and Port Sandwich Formation in Malakula, and from the Miocene Ilava, Peteao, and Pelapa Formations in Espiritu Santo.
Authors
Binyamin Buchbinder, Robert B. Halley
Styles of organic facies development in selected coal beds of the Powder River Basin: A petrographic evaluation
No abstract available.
Authors
R.W. Stanton, Timothy A. Moore, Peter D. Warwick, S.S. Crowley, Romeo M. Flores
Submarine topography of northeastern Papua New Guinea
No abstract available
Authors
Thomas E. Chase, Barbara A. Seekins, J. D. Young, Shawn V. Dadisman
Temporal and spatial variation in fruit production by chaparral shrubs,
No abstract available at this time
Authors
J. E. Keeley, S.C. Keeley
The influence of local weather on autumn migration of peregrine falcons of Assateague Island
No abstract available.
Authors
K. Titus, F.P. Ward, W.S. Seegar, M.A. Yates, M.R. Fuller
The mammals of Parque Nacional Serrania de la Neblina, Territorio Federal Amazonas, Venezuela
No abstract available.
Authors
A.L. Gardner
Toxic substances and survival of Lake Michigan salmonids: field and laboratory approaches
An examination is made of the effects of chemical contaminants on the reproduction of fish from the Great Lakes. Routes of contaminant exposure are outlined; andlake trout and chinook salmon mortality are discussed with respect to evidence showing contaminant involvement.
Authors
Michael J. Mac
Vaccination against infectious hematopoietic necrosis
No abstract available.
Authors
J.C. Leong, J. L. Fryer, J. R. Winton
Workshop summary: feeding ecology
No abstract available.
Authors
C. E. Korschgen, F.A. Reid, J.R. Serie