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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: 6144
Lymphosarcoma of the thymus of salmonids Lymphosarcoma of the thymus of salmonids
No abstract available.
Authors
Roger Herman
Survival and development of lake herring (Coregonus artedii) eggs at various incubation temperatures Survival and development of lake herring (Coregonus artedii) eggs at various incubation temperatures
Lake herring eggs stripped and fertilized from a local stock were incubated in a constant-flow incubator at constant temperatures ranging from 0 to 12.1° C. Rate of development, percentage survival, percentage of abnormal and normal hatching, and length of fry at hatching were determined. The average incubation time from fertilization to 50% hatch varied from 37 days at 9.9-10.3° C to...
Authors
Peter Colby, L.T. Brooke
Palynology of the Cretaceous-Tertiary boundary in the northern Rocky Mountain and Mississippi Embayment regions Palynology of the Cretaceous-Tertiary boundary in the northern Rocky Mountain and Mississippi Embayment regions
In both the Rocky Mountain and the Mississippi Embayment regions it is often difficult to distinguish Upper Cretaceous from lower Tertiary rocks on the basis of physical characteristics; the transition can be recognized with relative ease, however, on the basis of abrupt qualitative changes in plant microfossils. Many Cretaceous species vanish and new species appear in the Paleocene. In...
Authors
Robert Tschudy
Aims and methods of waterfowl research in North America Aims and methods of waterfowl research in North America
No abstract available.
Authors
W.F. Crissey
Biostratigraphy and dolomite porosity trends of the Lisburne Group Biostratigraphy and dolomite porosity trends of the Lisburne Group
This preliminary study is based on measured and carefully collected sections of the Lisburne Group (fig. 1, sees. 1-29). The outcrops extend from Cape Lisburne (sec. 1) in the west to Egaksrak River (sec. 29) in northeastern Alaska and are used as the basic building blocks for the carbonate facies maps and the cross section. Lithologic and foraminifera samples were collected at 10-foot...
Authors
Augustus Armstrong, Bernard Mamet
Breeding ground survey methods in North America Breeding ground survey methods in North America
No abstract available.
Authors
W.F. Crissey
Changing abundance of migratory birds in North America Changing abundance of migratory birds in North America
No abstract available.
Authors
J.W. Aldrich, C.S. Robbins
Distribution of DDT residues in tissues of birds in relation to mortality, body condition, and time Distribution of DDT residues in tissues of birds in relation to mortality, body condition, and time
No abstract available.
Authors
L.F. Stickel, W. Stickel
Extreme female predominance in the bloater (Coregonus hoyi) of Lake Michigan in the 1960's Extreme female predominance in the bloater (Coregonus hoyi) of Lake Michigan in the 1960's
The sex composition and other biological characteristics of the bloater changed substantially during recent decades of continuous ecological change in Lake Michigan. The percentages of females increased from 72% of the bloaters samples in 1928-32 to 95% in 1963, and ranged from 94 to 97% in 1964-69. The unusual predominance of females was established at an early age, unquestionably...
Authors
Edward Brown