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: 942
Hydrologic, chemical, and isotopic characterization of two small watersheds on Catoctin Mountain, north-central Maryland, U.S.A. Hydrologic, chemical, and isotopic characterization of two small watersheds on Catoctin Mountain, north-central Maryland, U.S.A.
Two small (100 ha) watersheds located on Catoctin Mountain in north-central Maryland were intensively instrumented in 1990 and have been hydrologically, chemically, and isotopically monitored for 3 years. Dissolved concentrations of major ions (Ca2+, Mg2+, Na+, K+, total AI, CI-, NO3-, SO42- , HCO3-, and SiO2) and stable isotopic (D and 18O) values have been analyzed for most types of...
Authors
Karen C. Rice, O.P. Bricker
Use of stable isotope ratios to discriminate dietary components of free-ranging animals: An example with Chesapeake Bay canvasbacks Use of stable isotope ratios to discriminate dietary components of free-ranging animals: An example with Chesapeake Bay canvasbacks
No abstract available.
Authors
G.M. Haramis, Dennis G. Jorde, P. N. Klein, S.A. Macko, B.S. Walker
Effects of nutrient management on nitrate levels in ground water near Ephrata Pennsylvania 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...
Authors
David W. Hall
Status and Assessment of Chesapeake Bay Wildlife Contamination 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...
Authors
G. H. Heinz, Stanley N. Wiemeyer, D. R. Clark, P.H. Albers, P. Henry, R.A. Batiuk
Residence times in river basins as determined by analysis of long-term tritium records 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...
Authors
R. L. Michel
Chesapeake Bay striped bass: the consequences of habitat degradation Chesapeake Bay striped bass: the consequences of habitat degradation
No abstract available at this time
Authors
P.J. Rago
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 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...
Authors
D. K. Fishel, M. J. Brown, K. M. Kostelnik, M.A. Howse
Comparative productivity of American black ducks and mallards nesting on Chesapeake Bay Islands 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...
Authors
D.G. Krementz, Daniel B. Stotts, G.W. Pendleton, J.E. Hines, Vernon D. Stotts
Acid rain and its effects on streamwater quality on Catoctin Mountain, Maryland 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...
Authors
Karen C. Rice, O.P. Bricker
Acid-rain induced changes in streamwater quality during storms on Catoctin Mountain, Maryland 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...
Authors
Karen C. Rice, O.P. Bricker
Colonial wading birds: herons and egrets Colonial wading birds: herons and egrets
No abstract available.
Authors
R.M. Erwin, J. A. Spendelow
Tributary-stream infiltration in Marsh Creek Valley, north-central Pennsylvania Tributary-stream infiltration in Marsh Creek Valley, north-central Pennsylvania
The geohydrology of infiltration from five tributary streams along a 3.6-mile reach of Marsh Creek valley in north-central Pennsylvania was investigated during 1983-85. Marsh Creek valley is underlain by up to 100 feet of stratified drift that overlies Devonian bedrock. The stratified drift is overlain by up to 30 feet of alluvial-fan deposits near the tributary streams. Four of the five
Authors
John Williams