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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
Miscellaneous methods [water retention and storage] Miscellaneous methods [water retention and storage]
No abstract available.
Authors
John R. Nimmo, K.A. Winfield
Temperature history of Coregonus artedi in the St. Marys River, Laurentian Great Lakes, inferred from oxygen isotopes in otoliths Temperature history of Coregonus artedi in the St. Marys River, Laurentian Great Lakes, inferred from oxygen isotopes in otoliths
The population of Coregonus artedi in the St. Marys River, between lakes Superior and Huron, was sampled and otoliths were analyzed for oxygen isotopic composition to determine whether the fish are residents in the St. Marys River and its warm bays or migrants to and from cold Lake Huron. Otoliths were extracted, sectioned, and growth ring-specific samples of calcium carbonate were...
Authors
Zeina Joukhadar, W.P. Patterson, T. N. Todd, G.R. Smith
A model to predict the occurrence of surviving butternut trees in the southern Appalachian region: Chapter 43 A model to predict the occurrence of surviving butternut trees in the southern Appalachian region: Chapter 43
No abstract available.
Authors
Frank T. van Manen, Joseph D. Clark, Scott E. Schlarbaum, Kristine D. Johnson, Glenn Taylor
Abundance: Population size and density estimation Abundance: Population size and density estimation
Estimates of population size (total number of individuals) or density (number of individuals per unit area) are some of the most basic requirements for wildlife research and management. This article provides a brief overview of approaches for wildlife population estimation. These include habitat-based approaches such as quadrat, line intercept, distance, and repeated count methods, as...
Authors
Mark S. Udevitz, William R. Gould
Aldo Leopold: Conservationist and hunter Aldo Leopold: Conservationist and hunter
No abstract available.
Authors
L. David Mech
Alien annual plants and their relationships to fire and biotic change in Sonoran Desertscrub Alien annual plants and their relationships to fire and biotic change in Sonoran Desertscrub
No abstract available.
Authors
T. C. Esque, C.R. Schwalbe
American black duck summer range versus winter range: a dichotomy of riches American black duck summer range versus winter range: a dichotomy of riches
The status of the American black duck (Anas rubripes) population has more often been attributed to a single event than to multiple events over time and throughout space. The difference in the quality of the habitat, however defined, within breeding areas in the North and in the southerly wintering areas, especially Chesapeake Bay, also has been proposed as affecting black duck status...
Authors
J. R. Longcore
An application of queuing theory to waterfowl migration An application of queuing theory to waterfowl migration
There has always been great interest in the migration of waterfowl and other birds. We have applied queuing theory to modelling waterfowl migration, beginning with a prototype system for the Rocky Mountain Population of trumpeter swans (Cygnus buccinator) in Western North America. The queuing model can be classified as a D/BB/28 system, and we describe the input sources, service...
Authors
Richard S. Sojda, John E. Cornely, Leigh H. Fredrickson
An overview of aggregate resources in the United States An overview of aggregate resources in the United States
In 2000 the USA produced about 2.7 billion tonnes of aggregate worth about $13.7 billion. Both crushed stone and sand and gravel are produced in virtually every State, although limited quantities are available in the Gulf Coastal Plain, the Colorado Plateau , the Wyoming Basin and the Great Plains. Prices vary depending on the product and location. Most aggregates are transported by road...
Authors
William H. Langer
Application of landscape models to alternative futures analyses Application of landscape models to alternative futures analyses
Scientists and environmental managers alike are concerned about broadscale changes in land use and landscape pattern and their cumulative impact on environmental and economic end points, such as water quality and quantity, species habitat, productivity, erosion potential, recreational value, and overall ecological health (Rapport et al., 1998). They also are interested in predicting...
Authors
A.C. Neale, K. Bruce Jones, Nash Maliha, Rick D. van Remortel, James D. Wickham, Kurt H. Riitters, Robert V. O’Neill
Approaches for the direct estimation of lambda, and demographic contributions to lambda, using capture-recapture data Approaches for the direct estimation of lambda, and demographic contributions to lambda, using capture-recapture data
We first consider the estimation of the finite rate of population increase or population growth rate, lambda sub i, using capture-recapture data from open populations. We review estimation and modelling of lambda sub i under three main approaches to modelling open-population data: the classic approach of Jolly (1965) and Seber (1965), the superpopulation approach of Crosbie & Manly (1985...
Authors
J.D. Nichols, J.E. Hines