Earthquake recurrence and risk assessment in circum-Pacific seismic gaps
W. Thatcher
1989, Nature (341) 432-434
THE development of the concept of seismic gaps, regions of low earthquake activity where large events are expected, has been one of the notable achievements of seismology and plate tectonics. Its application to long-term earthquake hazard assessment continues to be an active field of seismological research. Here I have surveyed...
DDE, selenium, mercury, and white-faced ibis reproduction at Carson Lake, Nevada
Charles J. Henny, Gary B. Herron
1989, Journal of Wildlife Management (53) 1032-1045
We studied organochlorine, mercury (Hg), and selenium (Se) contamination in white-faced ibis (Plegadis chihi) nesting at Carson Lake, Nevada, in 1985 and 1986. Dichloro diphenyl dichloroethylene (DDE) was related to fewer young produced/nesting attempt (P = 0.0001), fewer young produced/successful nest (P = 0.0075), and eggshell thinning (P = 0.0001)....
Effects of organophosphorus insecticides on sage grouse in southeastern Idaho
Lawrence J. Blus, Chris S. Staley, Charles J. Henny, Grey W. Pendleton, Tim H. Craig, Erica H. Craig, Douglas K. Halford
1989, Journal of Wildlife Management (53) 1139-1146
Die-offs of sage grouse (Centrocercus urophasianus) were verified in southeastern Idaho in 1981. We captured 82 apparently healthy grouse to quantify the effects of organophosphorus insecticides (OP's) and other pesticides on sage grouse in sagebrush (Artemisia spp.) bordering agricultural lands in July 1985 and 1986. Grouse were fitted with radio...
Water resources of northeast Iowa
P. J. Horick, P. J. Soenksen
1989, Report
In 1965 a cooperative investigation with the U.S. Geological Survey produced Water Atlas No. 1 (Twenter and Coble, 1965). It presented information on the occurrence, availability, use, quality, and future demand of water in 10 counties in the central part of the state. Subsequent investigations produced Water Atlases No. 4...
The correct citation and spelling of Ptiliogonys and type locality of Ptiliogonys cinereus
M. Ralph Browning
1989, The Auk (106) 743-746
William Swainson published descriptions and illustrations of many new forms of New World birds. In some of his earlier papers, Swainson cited his own works (of which only some parts have been published) as well as some manuscripts that were never published (see McMillan 1971). Swainson also referred to works...
Did Lewis and Clark discover the broad-tailed hummingbird (Selasphorus platycercus)?
Richard C. Banks, W. A. Calder III
1989, Archives of Natural History (16) 243-244
No abstract available....
Snow and ice perturbation during historical volcanic eruptions and the formation of lahars and floods
Jon J. Major, Christopher G. Newhall
1989, Bulletin of Volcanology (52) 1-27
Historical eruptions have produced lahars and floods by perturbing snow and ice at more than 40 volcanoes worldwide. Most of these volcanoes are located at latitudes higher than 35°; those at lower latitudes reach altitudes generally above 4000 m. Volcanic events can perturb mantles of snow and ice in...
Evaluation of inflow to Mirror Lake, New Hampshire
T. C. Winter, J.S. Eaton, G.E. Likens
1989, Journal of the American Water Resources Association (25) 991-1008
Measured stream discharge plus calculated ground water discharge (total measured runoff) were compared with runoff calculated by the unit-runoff method for the two largest watersheds of Mirror Lake for 1981–1983. Runoff calculated by the unit-runoff method, using Hubbard Brook watershed 3 as the index watershed, was greater than the total...
Peak accelerations from the 17 October 1989 Loma Prieta earthquake
D.M. Boore, Linda Seekins, W. B. Joyner
1989, Seismological Research Letters (60) 151-166
Peak accelerations of the Loma Prieta main shock have been tabulated from instruments maintained by a number of organizations. We have analyzed a subset of 86 records from nominally free-field sites, which have been subdivided into rock, alluvium, and bay-mud categories according to data available in various reports. After correction...
Earliest conifers in North America; upland and/or paleoclimatic indicators?
Paul C. Lyons, W.C. Darrah
1989, Palaios (4) 480-486
No abstract available. ...
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...
Assessing the relationship between Section 404 and wetland losses: a feasibility study
Douglas N. Gladwin, James E. Roelle, Duane A. Asherin
1989, Report
The primary objective of the Clean Water Act of 1977 (33 U.S.C. 1251) is to restore and maintain the physical, chemical, and biological integrity of the Nation's waters. Section 404 of the Act regulates the discharge of dredged or fill materials into wetlands and represents the primary Federal authority...
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,...
Salinity variations in submarine hydrothermal systems by layered double-diffusive convection
James L. Bischoff, Robert J. Rosenbauer
1989, Journal of Geology (97) 613-623
Various mechanisms have been proposed to explain the salinity variations in vent fluids of seafloor geothermal systems. New experiments reacting diabase and evolved seawater were carried out to reproduce earlier published observations of Cl depletions attributed to formation of an ephemeral Cl-bearing mineral. The absence of any Cl depletions in...
Biological diversity and global change: habitat fragmentation and extinction
C. M. Schonewald-Cox, T.J. Stohlgren
1989, Book, Proceedings of the second U.S.- U.S.S.R.symposium on air pollution effects on vegetation including forested ecosystems
No abstract available....
Effects of varying fire regimes on annual grasslands in the southern Sierra Nevada of California
David J. Parsons, Thomas J. Stohlgren
1989, Madroño (36) 154-168
Effects of up to three successive spring and fall burns on composition and biomass of the predominantly non-native grasslands of the southern Sierra Nevada foothills were evaluated. Fall and spring burning regimes increased the number and biomass of both alien and native forb species. No native grass species became established...
Logging in western Oregon: responses of headwater habitats and stream amphibians
Paul Stephen Corn, R. Bruce Bury
1989, Forest Ecology and Management (29) 39-57
We compared occurrence and abundance of four species of aquatic amphibians in 23 streams flowing through uncut forests to 20 streams flowing through forests logged between 14 and 40 years prior to the study. Species richness was highest in streams in uncut forests. Eleven streams in uncut forests contained all...
Distribution and migration of adult striped bass in Lake Whitney, Texas
B.W. Farquhar, S. Gutreuter
1989, Transactions of the American Fisheries Society (118) 523-532
Thirty adult (3.2–8.6 kg) striped bass Morone saxatilis were tagged with ultrasonic transmitters and tracked for up to 475 d in 9,510‐hectare Lake Whitney, a Texas reservoir, to determine seasonal distribution, migration patterns, and water temperatures occupied. Striped bass distribution in summer was limited to an area near the dam, where they...
Selenate reduction to elemental selenium by anaerobic bacteria in sediments and culture: Biogeochemical significance of a novel, sulfate-independent respiration
Ronald S. Oremland, James T. Hollibaugh, Ann S. Maest, Theresa S. Presser, Laurence G. Miller, Charles W. Culbertson
1989, Applied and Environmental Microbiology (55) 2333-2343
Interstitial water profiles of SeO42−, SeO32−, SO42−, and Cl− in anoxic sediments indicated removal of the seleno-oxyanions by a near-surface process unrelated to sulfate reduction. In sediment slurry experiments, a complete reductive removal of SeO42− occurred under anaerobic conditions, was more rapid with H2 or acetate, and was inhibited by O2, NO3−, MnO2,...
Accumulation and diagenesis of chlorinated hydrocarbons in lacustrine sediments
Steven J. Eisenreich, Paul D. Capel, John A. Robbins, R. Bourbonniere
1989, Environmental Science and Technology (23) 1116-1126
Two sediment cores were taken from the Rochester Basin of eastern Lake Ontario and analyzed for the radionuclides 210Pb and 137Cs and several high molecular weight chlorinated hydrocarbons (CHs). The two sites are geographically proximate but differ in sedimentation rate, permitting sedimentation-dependent processes to be factored out. The 210Pb chronology...
High-resolution leaf-fossil record spanning the Cretaceous/ Tertiary boundary
Kirk R. Johnson, Douglas J. Nichols, M. Attrep Jr., C. J. Orth
1989, Nature (340) 708-711
Theories that explain the extinctions characterizing the Cretaceous/Tertiary (K/T) boundary1-3 need to be tested by analyses of thoroughly sampled biotas. Palynological studies are the primary means for stratigraphic placement of the terrestrial boundary and for estimates of plant extinction4-12, but have not been combined with quantitative analyses of fossil leaves (megaflora)....
High-resolution leaf-fossil record spanning the Cretaceous/Tertiary boundary
K.R. Johnson, D. J. Nichols, M. Attrep Jr., C. J. Orth
1989, Nature (340) 708-711
Theories that explain the extinctions characterizing the Cretaceous/Tertiary (K/T) boundary1-3 need to be tested by analyses of thoroughly sampled biotas. Palynological studies are the primary means for stratigraphic placement of the terrestrial boundary and for estimates of plant extinction4-12, but have not been combined with quantitative analyses of fossil leaves (megaflora)....
Effect of sewage sludge on nutrient and toxic metal content of soil and selected crops grown on tropical soils
Nancy Cavallaro, Jose A. Villarrubia
1989, Report
No abstract available....
IGC Field Trip T218: Geomorphology, neotectonics, and process studies in the Rappahannock River basin, Virginia
Milan J. Pavich, Robert B. Jacobson, Wayne L. Newell
1989, Book chapter, Geomorphology, Neotectonics and Process Studies in the Rappahannock River Basin, Virginia: Marshall to Oak Grove, Virginia, July 15-16, 1989
No abstract available....
On the selection of sediment transport equations
Robert T. Milhous
1989, Book, Sediment transport modeling: Proceedings of International Symposium
No abstract available....
