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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: 6164
Overview of national bird population monitoring programs and databases Overview of national bird population monitoring programs and databases
A number of programs have been set up to monitor populations of nongame migratory birds. We review these programs and their purposes and provide information on obtaining data or results from these programs. In addition, we review recommendations for improving these programs.
Authors
G.S. Butcher, B. Peterjohn, C.J. Ralph
Paleogeographic implications of molluscan assemblages in the Upper Cretaceous (Campanian) Pigeon Point Formation, California Paleogeographic implications of molluscan assemblages in the Upper Cretaceous (Campanian) Pigeon Point Formation, California
The Pigeon Point Formation crops out along the San Mateo County coastline in a northern and southern sequence of folded and faulted strata. Correlation of the two sequences remains somewhat equivocal, although on the basis of biostratigraphy and a reversed magnetic interval both appear to have been deposited during the early to middle Campanian. Sedimentary structures suggest that the...
Authors
William P. Elder, LouElla Saul
Passive hemolytic plaque assay for detecting antibody-producing cells in fish Passive hemolytic plaque assay for detecting antibody-producing cells in fish
No abstract available at this time
Authors
D. P. Anderson
Point counts of landbirds in bottomland hardwood forests of the Mississippi Alluvial Valley: How long and how many? Point counts of landbirds in bottomland hardwood forests of the Mississippi Alluvial Valley: How long and how many?
To quantify efficacy of point count sampling in bottomland hardwood forests, we examined the influence of point count duration on corresponding estimates of number of individuals and species recorded. To accomplish this we conducted a totalof 82 point counts 7 May-16 May 1992distributed among three habitats (Wet, Mesic, Dry) in each of three regions within the lower Mississippi Alluvial...
Authors
W.P. Smith, D.A. Wiedenfeld, P.B. Hanel, D.J. Twedt, R.P. Ford, R.J. Cooper
Population characteristics and trends in the Eastern Management Unit Population characteristics and trends in the Eastern Management Unit
No abstract available.
Authors
F.W. Martin, J.R. Sauer
Population trends and management opportunities for neotropical migrants Population trends and management opportunities for neotropical migrants
The Breeding Bird Survey shows that certain Neotropical migrant songbird populations have been declining over the past 26 years. Among them are forest birds that require extensive forest on the breeding grounds and also forested habitats on tropical wintering grounds. Other species have shown significant declines only since the early 1980's. Birds with broader habitat tolerance, such as...
Authors
C.S. Robbins, J.R. Sauer, B.G. Peterjohn
Population trends of quails in North America Population trends of quails in North America
We used North American Breeding Bird Survey data (1966-91) to estimate distribution, relative abundance, and populatiori trends of quails. Population trends in grassland/shrub birds sympatric with northern bobwhite (Colinus virginianus) were also examined. Northern bobwhite and scaled quail (Callipepla squamata) populations have declined since 1966. Rates of decline for these quails have
Authors
K.E. Church, J.R. Sauer, Sam Droege
Recent experiences with PROSPECTOR II Recent experiences with PROSPECTOR II
No abstract available
Authors
R.B. McCammon