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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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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?
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 Valley (MA
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
No abstract available.
Authors
F.W. Martin, J.R. Sauer
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 those that
Authors
C.S. Robbins, J.R. Sauer, B.G. Peterjohn
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 increas
Authors
K.E. Church, J.R. Sauer, Sam Droege
Preservacion de ejemplares con maximo contenido de informacion y resumen de investigaciones basadas en tales materiales
No abstract available.
Authors
M.S. Foster
Recreation ecology research findings: Implications for wilderness and park managers
No abstract available.
Authors
J. L. Marion
Reproduction in temperate freshwater and estuarine fishes
No abstract available at this time
Authors
J.H. Kerby
Response of Great Lakes fish and wildlife to virtual elimination of chemicals
No abstract available.
Authors
Jon G. Stanley
Restoration of process and function on the California Channel Islands
No abstract available at this time
Authors
W. L. Halvorson