Publications
The USGS publishes peer-reviewed reports and journal articles which are used by Chesapeake Bay Program resource managers and policy makers to make science-based decisions for ecosystem conservation and restoration. Use the Search box below to find publications on selected topics.
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Filter Total Items: 901
Geohydrology and simulation of ground-water flow in the Red Clay Creek Basin, Chester County, Pennsylvania, and New Castle County, Delaware
The 54-square-mile Red Clay Creek Basin, located in the lower Delaware River Basin, is underlain primarily by metamorphic rocks that range from Precambrian to Lower Paleozoic in age. Ground water flows through secondary openings in fractured crystalline rock and through primary openings below the water table in the overlying saprolite. Secondary porosity and permeability vary with hydrogeologic un
Authors
Karen L. Vogel, Andrew G. Reif
Comparative productivity of American black ducks and mallards nesting on Chesapeake Bay Islands
The authors estimated laying dates, clutch sizes, and nest success rates of sympatrically breeding populations of American black ducks (Anas rubripes ) and mallards (Anas platyrhynchos ) on Chesapeake Bay islands between 1986 and 1989. Neither average laying date nor clutch size differed between black ducks and mallards. Nest success rates were higher for mallards in 2 of 4 years, but were area
Authors
D.G. Krementz, D.B. Stotts, G.W. Pendleton, J. E. Hines, Vernon D. Stotts
Status and Assessment of Chesapeake Bay Wildlife Contamination
As an integral component of its priority setting process, the Chesapeake Bay Program`s Toxics Subcommittee has sought the expertise of Chesapeake Bay researchers and managers in developing a series of Chesapeake Bay toxics status and assessment papers. In the report, evidence for historical and current contaminant effects on key bird species, mammals, reptiles and amphibians which inhabit the Ches
Authors
G. H. Heinz, Stanley N. Wiemeyer, D. R. Clark, P.H. Albers, P. Henry, R.A. Batiuk
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
Evaluation of agricultural best-management practices in the Conestoga River headwaters, Pennsylvania; description and water quality of the Little Conestoga Creek headwaters prior to the implementation of nutrient management
The headwaters of the Conestoga River are being studied to determine the effects of agricultural Best-Management Practices on surface-water and ground-water quality. As part of this study, a 5.82-square-mile area of the Little Conestoga Creek headwaters (Small Watershed) was monitored during 1984-86, prior to implementation of Best-Management Practices. This report describes the land use and hydro
Authors
D. K. Fishel, M. J. Brown, K. M. Kostelnik, M.A. Howse
Residence times in river basins as determined by analysis of long-term tritium records
The US Geological Survey has maintained a network of stations to collect samples for the measurement of tritium concentrations in precipitation and streamflow since the early 1960s. Tritium data from outflow waters of river basins draining 4500-75000 km2 are used to determine average residence times of water within the basins. The basins studied are the Colorado River above Cisco, Utah; the Kissim
Authors
R. L. Michel
Chesapeake Bay striped bass: the consequences of habitat degradation
No abstract available at this time
Authors
P.J. Rago
Effects of nutrient management on nitrate levels in ground water near Ephrata Pennsylvania
Effects of the implementation of nutrient management practices on ground-water quality were studied at a 55-acre farm in Lancaster County, Pennsylvania, from 1985-90. After nutrient management practices were implemented at the site in October 1986, statistically significant decreases (Wilcoxon Mann-Whitney test) in median nitrate concentrations in ground- water samples occurred at four of the five
Authors
David W. Hall
Geohydrology, water availability, and water quality of Jefferson County, West Virginia, with emphasis on the carbonate area
No abstract available.
Authors
M.D. Kozar, W.A. Hobba, J. A. Macy
Effects of submersed macrophytes on dissolved oxygen, pH and temperature under different conditions of wind, tide and bed structure
Seasonal data on diurnal dissolved-oxygen concentration (DO), pH, temperature and chlorophyll-a were collected and species composition and vertical structure of macrophyte beds were analyzed in the tidal Potomac River during the 1987 growing season. The relationships among these variables and physical and climatic factors were analyzed. Elevated surface temperatures, DO and pH were found in macrop
Authors
V. Carter, N. B. Rybicki, R.S. Hammerschlag
Movements and survival of American black duck and mallard broods on Chesapeake Bay
We attached radio transmitters to day-old American black duck (Anas rubripes) and mallard (A. platyrhynchos) ducklings and monitored duckling habitat use, brood movements, and survival rates for 30 days. Ducklings moved an average of 2.3 km within the first 24 hours and another 1.5 km thereafter. After the initial move, broods usually moved once more. No differences in initial movement distance, s
Authors
D.G. Krementz, G.W. Pendleton