Nitrogen concentrations near the water table of the Sheyenne Delta aquifer beneath cropland areas, Ransom and Richland Counties, North Dakota
T.K. Cowdery, K. Goff
1994, Conference Paper, North Dakota Water-Quality Symposium, 4th biennial, Fargo, North Dakota, March 30-31, 1994, Proceedings
No abstract available....
Drainage investment and wetland loss: an analysis of the national resources inventory data
Aaron J. Douglas, Richard L. Johnson
1994, Journal of Environmental Management (40) 341-355
The United States Soil Conservation Service (SCS) conducts a survey for the purpose of establishing an agricultural land use database. This survey is called the National Resources Inventory (NRI) database. The complex NRI land classification system, in conjunction with the quantitative information gathered by the survey, has numerous applications. The...
Some questions and answers to the mystery of sick owl syndrome
Thierry M. Work
1994, Hawaii's Forests and Wildlife Newsletter (IX) 1-3
No abstract available....
Relations between habitat variability and population dynamics of bass in the Huron River, Michigan
Ken D. Bovee, Tammy J. Newcomb, Thomas G. Coon
1994, Report
One of the assumption of the Instream Flow Incremental Methodology (IFIM) is that the dynamics of fish populations are directly or indirectly related to habitat availability. Because this assumption has not been successfully tested in coolwater streams, questions arise regarding the validity of the methodology in such streams....
Identification of tire leachate toxicants and a risk assessment of water quality effects using tire reefs in canals
S. M. Nelson, G. Mueller, D. C. Hemphill
1994, Bulletin of Environmental Contamination and Toxicology (52) 574-581
Cover is an important component of aquatic habitat and fisheries management. Fisheries biologists often try to improve habitats through the addition of natural and artificial material to improve cover diversity and complexity. Habitat-improvement programs range from submerging used Christmas trees to more complex programs using sophisticated artificial habitat...
A survey protocol for the Southwestern Willow Flycatcher (Empidonax traillii extimus)
Timothy J. Tibbitts, Mark K. Sogge, Susan J. Sferra
1994, Report
The southwestern willow flycatcher (Empidonax traillii extimus) is a riparian obligate neotropical migrant, nesting in cottonwood-willow associations and structurally similar riparian vegetation associations. The southwestern willow flycatcher has declined through the twentieth century, primarily due to a number of factors, including loss and fragmentation of riparian habitat, brood parasitism...
Effect of atrazine on potential denitrification in aquifer sediments
P. M. Bradley, F. H. Chapelle, M.L. Jagucki, P.B. McMahon
1994, Soil Biology and Biochemistry (26) 523-524
Agriculturaf use of fertilizers and herbicides has often resulted in nitrate and atrazine contamination of the shallow aquifers that underlay cultivated fields. In several cases, the concentrations of atrazine and nitrate dissolved in ground water are positively correlated (Spalding ef al., 1979; Chen and Druliner, 1987; Spalding et al., 1989)....
Wide-band analysis of the 3 March 1985 central Chile earthquake: Overall source process and rupture history
Carlos Mendoza, Stephen H. Hartzell, Tony Monfret
1994, Bulletin of the Seismological Society of America (84) 269-283
We apply a linear, finite-fault waveform inversion scheme to the near-source strong-motion records, the teleseismic body waves, and the long-period Rayleigh waves recorded for the 3 March 1985 Chile earthquake to recover the mainshock rupture history. The data contain periods between about 2 and 350 sec and are inverted by...
Effect of dietary vitamin E and selenium on growth, survival and the prevalence of Renibacterium salmoninarum infection in chinook salmon (Oncorhynchus tshawytscha)
Ragnar Thorarinsson, Marsha L. Landolt, Diane G. Elliott, Ronald J. Pascho, Ronald W. Hardy
1994, Aquaculture (121) 343-358
Groups of juvenile spring chinook salmon naturally infected with Renibacterium salmoninarum, the causative agent of bacterial kidney disease, were fed diets containing different levels of vitamin E and selenium for 214 days in fresh water and 110 days in seawater. The fish were fed vitamin E at concentrations of either...
Identification of kin structure among Guam rail founders: A comparison of pedigrees and DNA profiles
Susan M. Haig, J.D. Ballou, N.J. Casna
1994, Molecular Ecology (3) 109-119
Kin structure among founders can have a significant effect on subsequent population structure. Here we use the correlation between DNA profile similarity and relatedness calculated from pedigrees to test hypotheses regarding kin structure among founders to the captive Guam rail (Rallus owstoni) population. Five different pedigrees were generated under the...
The contribution of evaporation from the Great Lakes to the continental atmosphere: estimate based on stable isotope data
Joel R. Gat, Carl J. Bowser, Carol Kendall
1994, Geophysical Research Letters (21) 557-560
The isotopic composition of precipitation and river runoff in the vicinity of the North American Great Lakes is characterized by a higher deuterium-excess value than observed in the advecting air masses. It is suggested that this indicates that evaporated moisture from the surface waters is mixed with the atmosphere waters....
Strike-slip faulting at Thebes Gap, Missouri and Illinois; implications for New Madrid tectonism
Richard W. Harrison, Art Schultz
1994, Tectonics (13) 246-257
Numerous NNE and NE striking strike-slip faults and associated normal faults, folds, and transtensional grabens occur in the Thebes Gap area of Missouri and Illinois. These structures developed along the northwestern margin of the buried Reelfoot rift of Precambrian-Cambrian age at the northern edge of the Mississippi embayment. They have...
Implications of felt area-magnitude relations for earthquake scaling and the average frequency of perceptible ground motion
Arthur Frankel
1994, Bulletin of the Seismological Society of America (84) 462-465
Observed relations between felt area and moment magnitude M for stable continental regions (SCR) and California earthquakes can be explained by a simple model with geometrical spreading, attenuation (Q−1), and earthquake stress drops that remain constant from M 4 to 8. Differences in the slopes of the observed felt...
Stratigraphic relations and structural chaos on the southeastern limb of the Blue Ridge Anticlinorium and points east, central Virginia
N.H. Evans, R. C. Milici
1994, Book chapter, Field guides to Southern Appalachian structure, stratigraphy, and engineering geology
No abstract available ...
Hurricane impacts on uplands and freshwater swamp forest: Large trees and epiphytes sustained the greatest damage during Hurricane Andrew
Lloyd Loope, Michael Duever, Alan Herndon, James Snyder, Deborah Jansen
1994, BioScience (44) 238-246
No abstract available....
Evidence for an upper mantle low velocity zone beneath the southern Basin and Range-Colorado Plateau transition zone
H.M. Benz, J. McCarthy
1994, Geophysical Research Letters (21) 509-512
A 370-km-long seismic refraction/wide-angle reflection profile recorded during the Pacific to Arizona Crustal Experiment (PACE) detected an upper mantle P-wave low-velocity zone (LVZ) in the depth range 40 to 55 km beneath the Basin and Range in southern Arizona. Interpretation of seismic data places constraints on the sub-crustal lithosphere of...
Estimates of soil ingestion by wildlife
W. Nelson Beyer, Erin E. Connor, Sarah Gerould
1994, Journal of Wildlife Management (58) 375-382
Many wildlife species ingest soil while feeding, but ingestion rates are known for only a few species. Knowing ingestion rates may be important for studies of environmental contaminants. Wildlife may ingest soil deliberately, or incidentally, when they ingest soil-laden forage or animals that contain soil. We fed white-footed mice (Peromyscus...
Mangroves, hurricanes, and lightning strikes: Assessment of Hurricane Andrew suggests an interaction across two differing scales of disturbance
Thomas J. Smith III, Michael B. Robblee, Harold R. Wanless, Thomas W. Doyle
1994, BioScience (44) 256-262
The track of Hurricane Andrew carried it across one of the most extensive mangrove for ests in the New World. Although it is well known that hurricanes affect mangrove forests, surprisingly little quantitative information exists concerning hurricane impact on forest structure, succession, species composition, and dynamics of mangrove-dependent fauna or...
Paleomagnetism and rotation constraints for the middle Miocene southwestern Nevada volcanic field
Mark R. Hudson, David A. Sawyer, Richard G. Warren
1994, Tectonics (13) 258-277
Middle Miocene rocks of the southwestern Nevada volcanic field (SWNVF) lie across the projection of the Walker Lane belt within the Basin and Range province and thus provide an interesting opportunity to test for late Cenozoic vertical-axis rotation. Paleomagnetic data from individual ash flow sheets document no significant relative vertical-axis...
Use of molecular techniques to evaluate the survival of a microorganism injected into an aquifer
S.M. Thiem, M.L. Krumme, R. L. Smith, J.M. Tiedje
1994, Applied and Environmental Microbiology (60) 1059-1067
A PCR primer set and an internal probe that are specific for Pseudomonas sp. strain B13, a 3-chlorobenzoate-metabolizing strain, were developed. Using this primer set and probe, we were able to detect Pseudomonas sp. strain B13 DNA sequences in DNA extracted from aquifer samples 14.5 months after Pseudomonas sp. strain...
40Ar/39Ar constraints on chronology of Augusta fault zone movement and late Alleghanian extension, Southern Appalachian Piedmont, South Carolina and Georgia
H.D. Maher, R.D. Dallmeyer, D.T. Secor, P. E. Sacks
1994, American Journal of Science (294) 428-448
No abstract available ...
The effects of volcanic ash disturbances on a peat-forming environment: Environmental disruption and taphonomic consequences
Sharon S. Crowley, D.A. Dufek, R.W. Stanton, Thomas A. Ryer
1994, Palaios (9) 158-174
No abstract available. ...
Conservation of invertebrates in US National Parks
Howard S. Ginsberg
1994, American Entomologist (40) 76-79
Entomologists who enter national parks often are surprised by the diversity of life and geography found in these remarkable natural areas. There are ichneumon wasps, carabid beetles, leps…and, of course, there are trees and mountains. In contrast, an average person entering the same parks will see the magnificent mountains and...
Transport of chromium and selenium in the suboxic zone of a shallow aquifer: Influence of redox and adsorption reactions
D.B. Kent, J.A. Davis, L.C.D. Anderson, B.A. Rea, T.D. Waite
1994, Water Resources Research (30) 1099-1114
Breakthrough of Cr(VI) (chromate), Se(VI) (selenate), and O2 (dissolved oxygen) was observed in tracer tests conducted in a shallow, sand and gravel aquifer with mildly reducing conditions. Loss of Cr, probably due to reduction of Cr(VI) to Cr(III) and irreversible sorption of Cr(III), occurred along with slight retardation of Cr(VI), owing...
Early warning system for aftershocks
W. H. Bakun, F.G. Fischer, E.G. Jensen, J. VanSchaack
1994, Bulletin of the Seismological Society of America (84) 359-365
A prototype early warning system to provide San Francisco and Oakland, California a few tens-of-seconds warning of incoming strong ground shaking from already-occurred M ≧ 3.7 aftershocks of the magnitude 7.1 17 October 1989 Loma Prieta earthquake was operational on 28 October 1989. The prototype system consisted of four components:...
