Interstadial climatic cycles: A link between western North America and Greenland?
Fred M. Phillips, Andrew R. Campbell, George I. Smith, James L. Bischoff
1994, Geology (22) 1115-1118
During the interval 33.6 to 26.1 ka, Searles Lake in southeastern California went through six major cycles of expansion and contraction. A comparison of U/Th ages for these events with the chronologies for quasi-cyclic interstadial episodes in the ice core from Summit, Greenland, suggests that the episodes of low water...
Analysis of ERS 1 synthetic aperture radar data of frozen lakes in northern Montana and implications for climate studies
Dorothy K. Hall, Daniel B. Fagre, Fritz Klasner, Gregg Linebaugh, Glen E. Liston
1994, Journal of Geophysical Research (99) 1
Lakes that freeze each winter are good indicators of regional climate change if key parameters, such as freeze-up and breakup date and maximum ice thickness, are measured over a decade-scale time frame. Synthetic aperture radar (SAR) satellite data have proven to be especially useful for measurement of climatologically significant parameters...
Arboreal lichen in uncut and partially cut subalpine fir stands in woodland caribou habitat, northern Idaho and southeastern British Columbia
Eric M. Rominger, Lydia Allen-Johnson, John L. Oldemeyer
1994, Forest Ecology and Management (70) 195-202
To better understand the effects of partial cutting on arboreal lichen production within woodland caribou (Rangifer tarandus caribou) habitat, lichen was hand picked from 1228 branches on 307 subalpine fir (Abies lasiocarpa) trees in Idaho (ID), and in British Columbia (BC). Lichen biomass from partially cut stands was compared with...
Predation by odonate nymphs on larval razorback suckers (Xyrauchen texanus) under laboratory conditions
Michael J. Horn, Paul C. Marsh, Gordon Mueller, Tom Burke
1994, Southwestern Naturalist (39) 371-374
High larval mortality has plagued efforts to raise razorback suckers (Xyrauchen texanus) in a Lake Mohave, Arizona-Nevada backwater. Observations indicate odonate nymph densities may be high enough to impact larval survival. In laboratory tests conducted in aquaria, damselfly (Coenagrionidae: Enallagma sp.) and dragonfly (Libellulidae: Tramea sp.) nymphs consumed 81% and...
Chemical characterization of sediments and pore water from the upper Clark Fork River and Milltown Reservoir, Montana
W. G. Brumbaugh, C.G. Ingersoll, N.E. Kemble, T.W. May, J.L. Zajicek
1994, Environmental Toxicology and Chemistry (13) 1971-1983
The upper Clark Fork River basin in western Montana is widely contaminated by metals from past mining, milling, and smelting activities As part of a comprehensive ecological risk assessment for the upper Clark Fork River, we measured physical and chemical characteristics of surficial sediment samples that were collected from depositional...
Light-mediated predation by northern squawfish on juvenile Chinook salmon
James H. Petersen, Dena M. Gadomski
1994, Journal of Fish Biology (45) 227-242
Northern squawfish Ptychocheilus oregonensis cause significant mortality of juvenile salmon in the lower Columbia River Basin (U.S.A.). The effects of light intensity on this predator-prey interaction were examined with laboratory experiments and modelling studies. In laboratory experiments, the rate of capture of subyearling chinook salmon Oncorhynchus tshawytscha by northern squawfish...
Neutralization-resistant variants of infectious hematopoietic necrosis virus have altered virulence and tissue tropism
C.H. Kim, J. R. Winton, J.C. Leong
1994, Journal of Virology (68) 8447-8453
Infectious hematopoietic necrosis virus (IHNV) is a rhabdovirus that causes an acute disease in salmon and trout. In this study, a correlation between changes in tissue tropism and specific changes in the virus genome appeared to be made by examining four IHNV neutralization-resistant variants (RB-1, RB-2, RB-3, and RB-4) that...
Are all prey created equal? A review and synthesis of differential predation on prey in substandard condition
Matthew G. Mesa, Thomas P. Poe, Dena M. Gadomski, James H. Petersen
1994, Journal of Fish Biology (45) 81-96
Our understanding of predator-prey interactions in fishes has been influenced largely by research assuming that the condition of the participants is normal. However, fish populations today often reside in anthropogenically altered environments and are subjected to many kinds of stressors, which may reduce their ecological performance by adversely affecting their...
Analysis of larval trematode communities
Kevin D. Lafferty, D. T. Sammond, A. M. Kuris
1994, Ecology (75) 2275-2285
We can compare natural communities with null models of communities to indicate how they differ from random assemblages of species (i.e., how much structure is present). However, because null models draw on observed values of species' prevalences, whatever structure already exists in natural communities affects the composition of a null...
Mineralogy, paragenesis, and mineral zoning of the Bulldog Mountain vein system, Creede District, Colorado
Geoffrey S. Plumlee, Pamela Heald Whitehouse-Veaux
1994, Economic Geology (89) 1883-1905
The Bulldog Mountain vein system, Creede district, Colorado, is one of four major epithermal vein systems from which the bulk of the district's historical Ag-Pb-Zn-Cu production has come. Ores deposited along the vein system were discovered in 1965 and were mined from 1969 to 1985.Six temporally gradational mineralization stages have...
Variability and prediction of freshwater and nitrate fluxes for the Louisiana-Texas shelf: Mississippi and Atchafalaya River source functions
A. Bratkovich, S.P. Dinnel, D. A. Goolsby
1994, Estuaries (17) 766-778
Time histories of riverine water discharge, nitrate concentration, and nitrate, flux have been analyzed for the Mississippi and Atchafalaya rivers. Results indicate that water discharge variability is dominated by the annual cycle and shorter-time-scale episodic events presumably associated with snowmelt runoff and spring or summer rains. Interannual variability in water...
Determination of atrazine in rainfall and surface water by enzyme immunoassay
Andrea Dankwardt, Susanne Wust, Wolfram Elling, E. Michael Thurman, Bertold Hock
1994, Environmental Science and Pollution Research (1) 196-204
Rainwater and surface water from four sites in Germany (Bavaria and Lower Saxony) were analyzed for atrazine by enzyme immunoassay from June 1990 until October 1992. The limit of quantification of the immunoassay was 0.02 μg/L with a middle of the test at 0.2 μg/L. About 60 % of the...
Characterization of ecological risks at the Milltown Reservoir-Clark Fork River Sediments Superfund Site, Montana
Gary A. Pascoe, Richard J. Blanchet, Greg L. Linder, Don Palawski, William G. Brumbaugh, Tim J. Canfield, Nile E. Kemble, Chris G. Ingersoll, Aida M. Farag, Julie A. DalSoglio
1994, Environmental Toxicology and Chemistry (13) 2043-2058
A comprehensive field and laboratory approach to the ecological risk assessment for the Milltown Reservoir-Clark Fork River Sediments Site, a Superfund site in the Rocky Mountains of Montana, has been described in the preceding reports of this series. The risk assessment addresses concerns over the ecological impacts of upstream releases...
Effects of land disposal of municipal sewage sludge on fate of nitrates in soil, streambed sediment, and water quality
James A. Tindall, Kenneth J. Lull, Neville G. Gaggiani
1994, Journal of Hydrology (163) 147-185
This study was undertaken to determine the effects of sewage-sludge disposal at the Lowry sewage-sludge-disposal area, near Denver, Colorado, on ground- and surface-water quality, to determine the fate of nitrates from sludge leachate, and to determine the source areas of leachate and the potential for additional leaching from the disposal...
A special issue on volcanic centers as targets for mineral exploration; preface
Wolfgang E. Elston, Geoffrey S. Plumlee, editor(s)
1994, Economic Geology (89) 1661
NEPTUNE or Pluto? Since the days of Hutton and Werner, every generation of economic geologists has addressed this question in a new light. Most papers in this special issue deal with the thin and leaky roof of Pluto's underworld. It allows hot emanations from Hades to leak out, only to...
Influence of diurnal variations in stream temperature on streamflow loss and groundwater recharge
Jim Constantz, Carole L. Thomas, Gary W. Zellweger
1994, Water Resources Research (30) 3253-3264
We demonstrate that for losing reaches with significant diurnal variations in stream temperature, the effect of stream temperature on streambed seepage is a major factor contributing to reduced afternoon streamflows. An explanation is based on the effect of stream temperature on the hydraulic conductivity of the streambed, which can be...
Uranium retention by weathered schists-The role of iron minerals
T.E. Payne, J.A. Davis, T.D. Waite
1994, Radiochimica Acta (66-67) 297-303
No abstract available....
Uranium(VI) adsorption to ferrihydrite: Application of a surface complexation model
T.D. Waite, J.A. Davis, T.E. Payne, G.A. Waychunas, N. Xu
1994, Geochimica et Cosmochimica Acta (58) 5465-5478
A study of U(VI) adsorption by ferrihydrite was conducted over a wide range of U(VI) concentrations, pH, and at two partial pressures of carbon dioxide. A two-site (strong- and weak-affinity sites, FesOH and FewOH, respectively) surface complexation model was able to describe the experimental data well over a wide range...
Rhyolitic glass in Ordovician K-bentonites: A new stratigraphic tool: Comment and reply
Paul C. Lyons, John W. Delano, Steven J. Tice, Charles E. Mitchell, Daniel Goldman
1994, Geology (22) 1151-1153
No abstract available ...
Simulation of long-term thermal characteristics of three Estonian lakes
J. Vassiljev, S.P. Harrison, Steven W. Hostetler, Patrick J Bartlein
1994, Journal of Hydrology (163) 107-123
A one-dimensional surface energy-balance lake model, coupled to a thermodynamic model of lake ice, is used to simulate variations in the temperature of and evaporation from three Estonian lakes: Karujärv, Viljandi and Kirjaku. The model is driven by daily climate data, derived by cubic-spline interpolation from monthly mean data, and...
Stable isotopes of oxygen and hydrogen in the Truckee River–Pyramid Lake surface‐water system. 2. A predictive model of δ18O and 182H in Pyramid Lake
S. W. Hostetler, L. V. Benson
1994, Limnology and Oceanography (39) 356-364
A physically based model of variations in δ18O and δ2H in Pyramid Lake is presented. For inputs, the model uses measurements of liquid water inflows and outflows and their associated isotopic compositions and a set of meteorological data (radiative fluxes, air temperature, relative humidity, and windspeed). The model simulates change of lake...
Analysis of the surface hydrology in a regional climate model
F. Giorgi, Steven W. Hostetler, Christine Shields Brodeur
1994, Quarterly Journal of the Royal Meteorological Society (120) 161-183
This paper discusses the surface hydrology of a multi‐year simulation of present day climate over the United States (US) conducted with a regional climate model (RegCM) nested within a general circulation model (GCM). The RegCM, which is run with a 60 km gridpoint spacing is interactively coupled with a state‐of‐the‐art...
Advanced technologies for wilderness monitoring and management
D. S. Ouren, J. Hummel, M. Eley, M. Sestak, A. Riebau
1994, Book, Wilderness: The Spirit Lives, 6th National Wilderness Conference
No abstract available....
Biogeochemical processes and migration of aqueous constituents in ground water contaminated with crude oil
Mary Jo Baedecker, Isabelle M. Cozzarelli
1994, Conference Paper
No abstract available....
Introduction to the special section northeast Japan: A case history of subduction
Carol A. Finn, Gaku Kimura, Kiyoshi Suyehiro
1994, Journal of Geophysical Research B: Solid Earth (99) 22137-22145
Subduction-related tectonic events such as strike-slip faulting, uplift of high-pressure metamorphic rocks in the forearc, back arc spreading, arc magmatism, and continental collisions have shaped northeast Japan, making it a case history for subduction. Much of the record of these events is preserved and can be used to reconstruct the...
