Publications
These publications showcase the significant science conducted in our Science Centers.
Filter Total Items: 16795
Acid-rain induced changes in streamwater quality during storms on Catoctin Mountain, Maryland
Catoctin Mountain receives some of the most acidic (lowest pH) rain in the United States. In 1990, the U.S. Geological Survey (USGS), in cooperation with the Maryland Department of the Environment (MDE) and the Maryland Department of Natural Resources (DNR), began a study of the effects of acid rain on the quality of streamwater on the part of Catoctin Mountain within Cunningham Falls State Park,
Authors
Karen C. Rice, O.P. Bricker
Acid rain and its effects on streamwater quality on Catoctin Mountain, Maryland
The U.S. Geological Survey (USGS) is the Nation's largest water-science and water-information agency. The mission of the Water Resources Division of the USGS is to provide the hydrologic information and understanding needed for the best management of the Nation's water resources. To fulfill this mission, the USGS conducts water-quality and other types of investigations of the Nation's surface- and
Authors
Karen C. Rice, O.P. Bricker
A stochastic population model of mid-continental mallards
We developed a simulation model that integrates infonnation on factors affecting the population dynamics of mallards in the mid-continental region of the United States. In the model we vary age, body mass, and reproductive and molt status of simulated females. Females use several types of nesting and foraging habitat in 15 geographic areas. Deterministic and stochastic events cause mortality or at
Authors
Rolf R. Koford, J.R. Sauer, D. H. Johnson, J. D. Nichols, M. D. Samuel
Geographic patterns in population trends of neotropical migrants in North America
We use the route-regression method to estimate the population trends of 100 species of Neotropical migrants using data from the North American Breeding Bird Survey (BBS). We examine long-term (1966-1988) and recent (1978-1988) trends. In the long-term, more species of Neotropical migrants were increasing than were decreasing in the eastern and western parts of the continent, but recent trends in
Authors
J.R. Sauer, Sam Droege
Observations of seabirds along a 14,892-km cruise track in the tropical Pacific Ocean and the Bohol, Sulu, and South China Seas
No abstract available.
Authors
A.K. Kepler, C.B. Kepler, D. H. Ellis, J. S. Hatfield
Long-range transport of atmospheric organochlorine pollutants and air-sea exchange of hexachlorocyclohexane
No abstract available.
Authors
D.A. Hinckley, T.F. Bidleman, C.P. Rice
Black duck population units as determined by patterns of band recovery
To estimate regional survival and band recovery rates for waterfowl populations, banding sites must be grouped for data analysis. We group American black duck banding sites using cluster analysis of pairwise comparisons of the distributions of band recoveries. We propose 6 population units, substantially fewer than the 27 black duck reference areas currently used. Flyways do not seem to reflect th
Authors
G.W. Pendleton, J.R. Sauer
Population models for passerine birds: structure, parameterization, and analysis
Population models have great potential as management tools, as they use infonnation about the life history of a species to summarize estimates of fecundity and survival into a description of population change. Models provide a framework for projecting future populations, determining the effects of management decisions on future population dynamics, evaluating extinction probabilities, and addressi
Authors
B.R. Noon, J.R. Sauer
First records of the long-tailed cuckoo (Eudynamis taitensis) on Caroline Atoll, Southern Line Islands, Republic of Kiribati
No abstract available.
Authors
D. H. Ellis, C.B. Kepler, A.K. Kepler, K. Teeb'aki
Modelling population change from time series data
Information on change in population size over time is among the most basic inputs for population management. Unfortunately, population changes are generally difficult to identify, and once identified difficult to explain. Sources of variald (patterns) in population data include: changes in environment that affect carrying capaciyy and produce trend, autocorrelative processes, irregular environme
Authors
R. J. Barker, J.R. Sauer
Baseline levels of certain trace metals in sediment and biota
No abstract available.
Authors
A. J. Krynitsky, C.P. Rice, P.F. Roscigno