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...
Downstream migration of recently metamorphosed sea lampreys in the Ocqueoc River, Michigan, before and after treatment with lampricides
Lee H. Hanson, William D. Swink
1989, North American Journal of Fisheries Management (9) 327-331
The objectives of this study were to determine the effectiveness ofchemical treatments of the Ocqueoc River, Michigan, in reducing the number of recently metamorphosed sea lampreys Petromyzon marinus migrating to Lake Huron and to estimate total numbers of migrants produced before and after treatment. Sea lampreys were captured during their downstream migration...
Effects of water temperature on the mortality of field-collected fish marked with fluorescent pigment
L. E. Holland Bartels, M. R. Dewey, S. J. Zigler
1989, North American Journal of Fisheries Management (9) 341-344
The cumulative effects of collection, handling, and marking with fluorescent pigment on the mortality of adult minnows, young-of-the-year centrarchids, and large centrarchids and percids was determined at five water temperatures (10-20.6 degree C) in field trials. There have been few field trials of this type. The mortality...
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)...
Seismology
John R. Filson, Roger D. Borcherdt, C. Langer, D. Simpson
1989, Earthquake Spectra (5) 1-12
No abstract available....
Range expansion by bison of Yellowstone National Park
Mary Meagher
1989, Journal of Mammalogy (70) 670-675
No abstract available....
Mount Mazama and Crater Lake caldera, Oregon
Charles R. Bacon
1989, Book chapter, South cascades arc volanism, California and southern Oregon: Red Bluff to Redding, California, July 20-226, 1989
No abstract available....
IGC field trip T312: South cascades arc volcanism, California and southern Oregon
L.J. Patrick Muffler, Charles R. Bacon, Robert L. Christiansen, Michael A. Clynne, Julie M. Donnelly-Nolan, Cheryl Miller, David R. Sherrod, J.C. Smith
1989, Book chapter, South cascades arc volcanism, California and southern Oregon: Red Bluff to Redding, California, July 20-26, 1989
No abstract available....
Aquatic weed control by grass carp in cool water
Joan S. Thullen
1989, Book, Proceedings of the National Water Conference
No abstract available....
Measures of little gravity
Robert I. Tilling
1989, Nature (342) 862-863
No abstract available....
Magnification of secondary production by kelp detritus in coastal marine ecosystems
D. O. Duggins, C.A. Simenstad, J. A. Estes
1989, Science (245) 170-173
Kelps are highly productive seaweeds found along most temperate latitude coastlines, but the fate and importance of kelp production to nearshore ecosystems are largely unknown. The trophic role of kelp-derived carbon in a wide range of marine organisms was assessed by a natural experiment. Growth rates of benthic suspension feeders...
Slope movements triggered by heavy rainfall, November 3–5, 1985, in Virginia and West Virginia, U.S.A.
Robert B. Jacobson, Elizabeth D. Cron, John P. McGeehin
1989, GSA Special Papers (236) 1-14
Study of slope movements triggered by the storm of November 3–5, 1985, in the central Appalachian Mountains, U.S.A., has helped to define the meteorologic conditions leading to slope movements and the relative importance of land cover, bedrock, surficial geology, and geomorphology in slope movement location. This long-duration rainfall at moderate...
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....
Factors affecting water-supply potential of the Twin Cities metropolitan area aquifer system
M.E. Schoenberg
1989, Journal of the Minnesota Academy of Science (55) 38-47
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...
Development rates of Late Quaternary soils, Silver Lake playa, California
M.C. Reheis, J.W. Harden, Leslie D. McFadden, Ralph R. Shroba
1989, Soil Science Society of America Journal (53) 1127-1140
Soils formed on alluvial fan deposits that range in age from about 35 000 to 200 yr BP near Silver Lake playa in the Mojave Desert permit study of the rates of soil development in an arid, hyperthermic climate. Field-described properties of soils were quantified and analyzed using a soil...
An interpretation of differences between field and laboratory pH values reported by the National Atmospheric Deposition Program/National Trends Network monitoring program
David S. Bigelow, D. L. Sisterson, LeRoy J. Schroder J.
1989, Environmental Science and Technology (23) 881-887
Differences between field and laboratory pH values reported by the National Atmospheric Deposition Program/National Trends Network (NADP/NTN) monitoring program from 1984 through 1986 are investigated. Median differences in hydrogen ion concentration between laboratory and field pH determinations at sites averaged -4.6 μequiv/L in natural precipitation samples on an annual basis....
Solute advection in stratified formations
V.D. Cvetkovic, Allen M. Shapiro
1989, Water Resources Research (25) 1283-1289
Advection‐dominated solute movement in stratified formations is investigated using a Lagrangian interpretation of particle motion. A probability density function (pdf) for particle position quantifies the expected depth‐integrated resident concentration. A pdf for particle arrival time quantifies the expected depth‐integrated rate of mass arrival, from which the flux‐averaged concentration can be...
Comparative toxicity of lead shot in black ducks (Anas rubripes) and mallards (Anas platyrhynchos)
Barnett A. Rattner, W. James Fleming, C.M. Bunck
1989, Journal of Wildlife Diseases (25) 175-183
In winter, pen-reared and wild black ducks (Anas rubripes), and game farm and wild mallards (Anas platyrhynchos), maintained on pelleted feed, were sham-dosed or given one number 4 lead shot. After 14 days, dosed birds were redosed with two or four additional lead shot. This dosing regimen also was repeated...
Organochlorine contaminants in eggs of common terns from the Canadian Great Lakes, 1981
D. V. Weseloh, T. W. Custer, B. M. Braune
1989, Environmental Pollution (59) 141-160
To determine if contaminant levels in Common Terns had changed over the last decade, we collected and analyzed eggs from four nesting colonies on the three lower Great Lakes during 1981. DDE and PCBs were detected in every egg from the four colonies. Dieldrin, mirex and trans-nonachlor were detected in more...
Global positioning system measurements for crustal deformation: Precision and accuracy
William H. Prescott, J.L. Davis, Jerry L. Svarc
1989, Science (244) 1337-1340
Analysis of 27 repeated observations of Global Positioning System (GPS) position-difference vectors, up to 11 kilometers in length, indicates that the standard deviation of the measurements is 4 millimeters for the north component, 6 millimeters for the east component, and 10 to 20 millimeters for the vertical component. The uncertainty...
The crustal structure of the Wrangellia Terrane along the East Glenn Highway, eastern‐southern Alaska
E.B. Goodwin, Gary S. Fuis, Warren J. Nokleberg, E. L. Ambos
1989, Journal of Geophysical Research B: Solid Earth (94) 16037-16057
Recently acquired seismic refraction data from eastern‐southern Alaska provide new information on the structure and composition of the Wrangellia and adjacent terranes. The data comprise a 160‐km‐long refraction profile along the East Glenn (Tok‐Cutoff) Highway that was collected as part of the U.S. Geological Survey's multidisciplinary Trans‐Alaska Crustal Transect program....
Rhenium-osmium and samarium-neodymium isotopic systematics of the Stillwater Complex
D.D. Lambert, John W. Morgan, Richard J. Walker, S.B. Shirey, R. W. Carlson, Michael L. Zientek, M.S. Koski
1989, Science (244) 1169-1174
Isotopic data for the Stillwater Complex, Montana, which formed about 2700 Ma (million years ago), were obtained to evaluate the role of magma mixing in the formation of strategic platinum-group element (PGE) ore deposits. Neodymium and osmium isotopic data indicate that the intrusion formed from at least two geochemically distinct...
Correspondence between vegetation and soils in wetlands and nearby uplands
Michael L. Scott, William L. Slauson, Charles A. Segelquist, Gregor T. Auble
1989, Wetlands (9) 41-60
The association between vegetation and soils from a geographically broad sampling of wetlands and adjoining uplands is reported for 38 hydric and 26 nonhydric soils, as recognized in the hydric soils list of the Soil Conservation Service. Wetlands represented in the study include estuaries, pitcher plant bogs, prairie depressional wetlands,...
Acid precipitation studies in Colorado and Wyoming: interim report of surveys of montane amphibians and water chemistry
Paul Stephen Corn, William Stolzenburg, R. Bruce Bury
1989, Report
Acid deposition may be detrimental or stressful to native populations of wildlife. Because many species of amphibians breed in shallow ponds created by spring rains or melting snow, they may be particularly vulnerable to the effects of acidification. From 1986 to 1988, we surveyed 105 locations in the...
