Trends in wintering canvasback populations at Catahoula Lake, Louisiana
Dennis W. Woolington, James W. Emfinger
1989, Conference Paper, Proceedings of the Annual Conference of the Southeastern Association of Fish and Wildlife Agencies
Aerial survey data (1968-1989) and water gauge readings (1958-1989) were examined to detennine trends in and relationships between canvasback (Aythya valisineria) populations and water levels at Catahoula Lake, Louisiana. Wintering canvasback populations at Catahoula Lake have increased over the past 21 years. A peak population estimate of 78,000 canvasbacks was...
Riparian ecosystem creation and restoration: a literature summary
Karen M. Manci
1989, Report
Riparian ecosystems generally compose a minor proportion of surrounding areas, but typically are more structurally diverse and more productive in plant and animal biomass than adjacent upland areas. Riparian areas supply food, cover, and water (especially important in the arid West) for a large diversity of animals, and serve as migration routes and forest...
Physical habitat simulation system reference manual: version II
Robert T. Milhous, Marlys A. Updike, Diane M. Schneider
1989, Report, Biological Report
There are four major components of a stream system that determine the productivity of the fishery (Karr and Dudley 1978). These are: (1) flow regime, (2) physical habitat structure (channel form, substrate distribution, and riparian vegetation), (3) water quality (including temperature), and (4) energy inputs from the watershed (sediments,...
Vegetation alteration along trails in Shenandoah National Park, Virginia
Christine N. Hall, Fred R. Kuss
1989, Biological Conservation (48) 211-227
Most studies in the USA of vegetation alteration and human impact along trails have been located in large western wilderness areas. The objective of this study was to determine vegetation changes occurring along trails in an eastern ecosystem supporting second-growth deciduous forest. The location of this study was Shenandoah National...
Effects of herbage removal on productivity of selected high-Sierra meadow community types
Thomas J. Stohlgren, Steven H. DeBenedetti, David J. Parsons
1989, Environmental Management (13) 485-491
We investigated the effects of herbage removal on three subalpine meadow plant communities in the Rock Creek drainage of Sequoia National Park, California, USA. In the xeric Carex exserta Mkze. (short-hair sedge) type, annual aboveground productivity averaged 19 g/m2 in control plots (clipped once after plant senescence in late September)...
Detection of coastal shoreline erosion using SPOT MSS data and ARC/INFO
Carl Markon
1989, Conference Paper, Proceedings of the 12th Canadian Symposium on Remote Sensing Geoscience and Remote Sensing Symposium
No abstract available....
Thirty-seventh supplement to the American Ornithologists' Union Check-list of North American birds
Burt L. Monroe, Richard C. Banks, John W. Fitzpatrick, Thomas R. Howell, Ned K. Johnson, Henri Ouellet, J.V. Remsen, Robert W. Storer
1989, The Auk (106) 532-538
This third supplement subsequent to the 6th edition (1983) of the A.O.U. "Check-list of North American Birds" consists of changes adopted by the Committee on Classification and Nomenclature as of 1 March 1989. The changes fall into nine categories: (1) six species are added to the main list (Pterodroma...
Stream temperature investigations: field and analytic methods
J.M. Bartholow
1989, Report
This document provides guidance to the user of the U.S. Fish and Wildlife Service’s Stream Network Temperature Model (SNTEMP). Planning a temperature study is discussed in terms of understanding the management objectives and ensuring that the questions will be accurately answered with the modeling approach being used. A sensitivity analysis of...
Screening of ground water samples for volatile organic compounds using a portable gas chromatograph
Robert C. Buchmiller
1989, Ground Water Monitoring Review (9) 126-130
A portable gas chromatograph was used to screen 32 ground water samples for volatile organic compounds. Seven screened samples were positive; four of the seven samples had volatile organic substances identified by second-column confirmation. Four of the seven positive, screened samples also tested positive in laboratory analyses of duplicate samples....
Estimating water‐table altitudes for regional ground‐water flow modeling, U.S. Gulf Coast
T.A. Williams, A. K. Williamson
1989, Groundwater (27) 333-340
Water‐table altitude, a controlling factor for ground‐ water flow, was estimated from detailed topographic data by subtracting the estimated depth‐to‐water. Land‐surface altitude of the Coastal Plain in the south‐central United States varies from 0 to more than 800 feet above sea level. Predevelopment depth‐to‐water in 6,825 wells less than 150 feet deep...
Application of the Graphic Correlation method to Pliocene marine sequences
H.J. Dowsett
1989, Marine Micropaleontology (14) 3-32
Biostratigraphy — the use of paleontological evidence to establish relative chronologies, forms the cornerstone of many sedimentary geological investigations. Several different approaches to biochronology are available. Traditional interval zones, defined on lowest and/or highest occurrences of selected taxa, are used...
Crustal studies using magnetic data
Richard J. Blakely, G. Connard
1989, GSA Memoirs (172) 45-60
The magnetic method plays an important role in mineral, petroleum, and geothermal exploration. It also has made important contributions to geologic mapping, structural geology, and plate-tectonic theory. In particular, magnetic measurements using aircraft provide a relatively inexpensive way to trace magnetic rock units beneath covered areas, to reveal the shape...
Isostatic residual gravity and crustal geology of the United States
Robert C. Jachens, Robert W. Simpson, Richard J. Blakely, Richard W. Saltus
1989, GSA Memoirs (172) 405-424
A new isostatic residual gravity map of the conterminous United States presents continent-wide gravity data in a form that can be readily used, with geologic information and other geophysical data, in studies of the composition and structure of the continental crust. This map was produced from the gridded gravity data...
Geologic analyses of Shuttle Imaging Radar (SIR-B) data of Kilauea Volcano, Hawaii
Lisa R. Gaddis, Peter J. Mouginis-Mark, Robert B. Singer, Verne Kaupp
1989, GSA Bulletin (101) 317-332
Analyses of imaging radar data of volcanic terranes on Earth and Venus have emphasized the need for a clearer understanding of how these data can be most effectively used to accomplish important volcanological goals, including the interpretation of eruptive styles and the characterization of the geologic history of volcanic centers....
Assessment of smolt condition for travel time analysis. Annual report 1988
D.W. Rondorf, J.W. Beeman, J.C. Faler, M.E. Free, E.J. Wagner
1989, Report
Estimates of migration rates and travel times of juvenile salmonids within index reaches of the Columbia River basin are collected through the Smolt Monitoring Program for use by the Fish Passage Center. With increased reliance upon travel time estimates in 1988 by the Fish Passage Center, this study was implemented...
Marine magnetic gradiometer: A tool for the seismic interpreter
Richard J. Wold, Alan K. Cooper
1989, Geophysics (8) 22-27
The marine magnetometer has been used since the early '50s as an ancillary tool on vessels conducting regional and local seismic surveys. Emphasis on marine magnetic data by academia has led to major discoveries about the structure of the earth's crust, such as the association of shallow, crustal magnetic anomalies...
U.S. Geological Survey state water-data reports water year 1987-: hydrologic records of the United States
Water Resources Division, U.S. Geological Survey
1989, Report
No abstract available....
User's guide for the wetland values citation data base
L.K. Miller, J. Muhlenbruck
1989, Report
No abstract available....
Global hypocenter data base
Water Resources Division, U.S. Geological Survey
1989, Report
No abstract available....
Regional lists of plant species that occur in wetlands: data base user's guide
Porter B. Reed Jr., Gregor T. Auble, Jill E. Muhlenbruck, Karen M. Manci
1989, Report
The Data Base List of Plant Species that Occur in Wetlands (LIST) currently contains records for 6,728 plant species. Each record provides information on nomenclature, plant characteristics and lifeforms, distribution, and frequency of occurrence in wetlands. The List of Plant Species that Occur in Wetlands, developed to supplement the U.S. Fish...
The ecology of hydric hammocks: a community profile
Susan W. Vince, Stephen R. Humphrey, Robert W. Simons
1989, Biological Report 85(7.26)
This community profile is one in a series of Fish and Wildlife Service publications compiled to provide a state-of-knowledge synthesis of scientific information and literature on various coastal habitats. The subject of this profile is the hydric hammock, a distinctive type of forested wetland occurring at low elevations along the...
Partition and adsorption on soil and mobility of organic pollutants and pesticides
C. T. Chiou
1989, Book chapter, Toxic organic chemicals in porous media
The mechanism for sorption of organic pollutants and pesticides by soil has long been a subject of profound interest because of its direct impacts on the mobility and activity of the compounds in soil. Although a large volume of laboratory and field data on many aspects of soil behavior had...
Seismic methods for determining earthquake source parameters and lithospheric structure
Walter D. Mooney
1989, GSA Memoirs (172) 11-34
The seismologic methods most commonly used in studies of earthquakes and the structure of the continental lithosphere are reviewed in three main sections: earthquake source parameter determinations, the determination of earth structure using natural sources, and controlled-source seismology. The emphasis in each section is on a description of data, the...
Annotated bibliography of economic literature on wetlands
Aaron J. Douglas
1989, Report
This bibliography is intended for the use of wetlands scientists, policy analysts, and natural resource professionals who have little acquaintance with natural resource economics, and natural resource professionals who have some background in economic analysis and wish to sharpen their appreciation of the specialized methods used to value the nonmarket...
Erosion and deterioration of the Isles Dernieres Barrier Island Arc, Louisiana, U.S.A.: 1853 to 1988
Randolph A. McBride, Shea Penland, Bruce E. Jaffe, S. Jeffress Williams, Asbury H. Sallenger Jr., Karen A. Westphal
1989, Gulf Coast Association of Geological Societies Transactions (39) 431-444
Using cartographic and aerial photography data from the years 1853, 1890, 1934, 1956, 1978, 1984, and 1988, shoreline change maps of the Isles Dernieres barrier island arc were constructed. These data were accurately superimposed, using a computer mapping system, which removed projection, datum, scale, and other cartographic inconsistencies. Linear, areal,...
