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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: 6198
The current status of amphibian and reptile ecotoxicological research The current status of amphibian and reptile ecotoxicological research
The extent of research conducted on the effects of contaminants on reptiles and amphibians has been scant compared to that of other vertebrate classes including fishes, birds and mammals. In a review of literature from 1972 until 1998 we found that only about 2.7% of the papers published on ecotoxicology in vertebrates concerned amphibians and 1.4% for reptiles. Most studies on amphibian
Authors
D. W. Sparling, C.A. Bishop, G. Linder
The effects of site, supplemental food, and age on survivorship of Carolina Chickadees and implications for dispersal through- riparian corridors The effects of site, supplemental food, and age on survivorship of Carolina Chickadees and implications for dispersal through- riparian corridors
Few studies have examined survivorship of animals in forest fragments differing in size, and none has used appropriate mark-recapture analysis techniques taking into account probability of recapture. Using Program MARK, a flexible mark-recapture software package, we estimated annual survival rates of Carolina Chickadees over a 5-yr period in a fragmented landscape in Ohio. The...
Authors
P.F. Doherty, T.G. Grubb
The global occurrence of natural gas hydrate The global occurrence of natural gas hydrate
Natural gas hydrate occurs worldwide in oceanic sediment of continental and insular slopes and rises of active and passive margins, in deep-water sediment of inland lakes and seas, and in polar sediment on both continents and continental shelves. In aquatic sediment, where water depths exceed about 300 m and bottom water temperatures approach 0° C, gas hydrate is found at the seafloor to...
Authors
Keith A. Kvenvolden, Thomas Lorenson
The inhibition of calcium carbonate formation in aqueous supersaturated solutions. Spontaneous precipitation and seeded crystal growth. The inhibition of calcium carbonate formation in aqueous supersaturated solutions. Spontaneous precipitation and seeded crystal growth.
No abstract available.
Authors
P.G. Klepetsanis, A. Kladi, T. Ostvold, C.G. Kontoyiannis, P.G. Koutsoukos, Z. Amjad, M.M. Reddy
The patterns and characteristics of global land cover The patterns and characteristics of global land cover
No abstract available.
Authors
Thomas R. Loveland
The role of helicopters in seabird censusing The role of helicopters in seabird censusing
The advantages and disadvantages of fixed-wing, helicopter, photographic, vidoegraphic, and ground-count methods of surveying and censusing seabirds are described and compared. Critical terminology is distinguished, and use of small helicopters with multiple, trained observers is firmly recommended for work with diurnal, non-burrow-nesting seabirds in the West Indies and elsewhere...
Authors
P. A. Buckley, F. G. Buckley
The role of population monitoring in the management of North American waterfowl The role of population monitoring in the management of North American waterfowl
Despite the effort and expense devoted to large-scale monitoring programs, few existing programs have been designed with specific objectives in mind and few permit strong inferences about the dynamics of monitored systems. The waterfowl population monitoring programs of the U.S. Fish and Wildlife Service, Canadian Wildlife Service and state and provincial agencies provide a nice example...
Authors
J.D. Nichols, B. Kenneth Williams, Fred A. Johnson
The role of vegetation in cowbird parasitism of yellow warblers The role of vegetation in cowbird parasitism of yellow warblers
No abstract available.
Authors
W.H. Howe, F.L. Knopf
The status and conservation on endemic Malagasy chelonians: An historic perspective The status and conservation on endemic Malagasy chelonians: An historic perspective
No abstract available.
Authors
Miguel Pedrono, Augustin Sarovy, L. Smith, Roger Bour
The status of masked bobwhite recovery in the United States and Mexico The status of masked bobwhite recovery in the United States and Mexico
The masked bobwhite (Colinus virginianus ridgwayi) is an endangered species currently numbering 1500 individuals and restricted to 2 locales in southeastern Arizona and northcentral Sonora, Mexico. The subspecies' endangered status is attributed to overgrazing of Sonora savanna grassland that began during the late 1880's and continued well into the 20th century. This overgrazing...
Authors
W.P. Kuvlesky, S.A. Gall, S.J. Dobrott, S. Tolley, F.S. Guthery, S.A. DeStefano, N. King, K.R. Nolte, N.J. Silvy, J. C. Lewis, G. Gee, G. Camou Luders, R. Engel-Wilson
The Tintina Gold Belt - A global perspective The Tintina Gold Belt - A global perspective
The so-called Tintina Gold Belt extends for more than 1000 km along the length of the northern North American Cordillera. Middle to Late Cretaceous Au deposits within the belt have various similar characteristics, among which are a spatial and temporal association with magmatism; Bi-W-Te signatures in deposits hosted by granitod stocks and As-Sb signatures where hosted by sedimentary...
Authors
Richard J. Goldfarb, Craig J. R. Hart, Marti L. Miller, Lance D. Miller, G. Lang Farmer, David I. Groves