Atrazine adsorption and colloid-facilitated transport through the unsaturated zone
Lori A. Sprague, J.S. Herman, G.M. Hornberger, A.L. Mills
2000, Journal of Environmental Quality (29) 1632-1641
One explanation for unexpectedly widespread ground water contamination from atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) may be the occurrence of colloid-facilitated transport, whereby the dissolved herbicide becomes adsorbed to mobile colloids that migrate through preferential flow-paths in the soil zone and into the ground water. The objectives of this study were to determine the...
Linkage of bioaccumulation and biological effects to changes in pollutant loads in south San Francisco Bay
Michelle I. Hornberger, S. N. Luoma, D.J. Cain, F. Parchaso, C. L. Brown, R. M. Bouse, C. Wellise, J.K. Thompson
2000, Environmental Science & Technology (34) 2401-2409
The developed world has invested billions of dollars in waste treatment since the 1970s; however, changes in ecological or biological responses are rarely associated with reductions in metal pollutants. Here we present a novel, 23-yr time series of environmental change from a San Francisco Bay mudflat located...
Tracer transport in fractured crystalline rock: Evidence of nondiffusive breakthrough tailing
Matthew W. Becker, Allen M. Shapiro
2000, Water Resources Research (36) 1677-1686
Extended tailing of tracer breakthrough is often observed in pulse injection tracer tests conducted in fractured geologic media. This behavior has been attributed to diffusive exchange of tracer between mobile fluids traveling through channels in fractures and relatively stagnant fluid between fluid channels, along fracture walls, or within the bulk...
Nitrogen solutes in an Adirondack forested watershed: Importance of dissolved organic nitrogen
M.R. McHale, M.J. Mitchell, Jeffery J. McDonnell, C.P. Cirmo
2000, Biogeochemistry (48) 165-184
Nitrogen (N) dynamics were evaluated from 1 June 1995 through 31 May 1996 within the Arbutus Lake watershed in the Adirondack Mountains of New York State, U.S.A. At the Arbutus Lake outlet dissolved organic nitrogen (DON), NO3/- and NH4/+ contributed 61%, 33%, and 6% respectively, to the total dissolved nitrogen...
Predicting the physical effects of relocating Boston's sewage outfall
R. P. Signell, H. L. Jenter, A.F. Blumberg
2000, Estuarine, Coastal and Shelf Science (50) 59-72
Boston is scheduled to cease discharge of sewage effluent in Boston Harbor in Spring 2000 and begin discharge at a site 14 km offshore in Massachusetts Bay in a water depth of about 30 m. The effects of this outfall relocation on effluent dilution, salinity and circulation are predicted with...
Surface-subsurface exchange and nutrient spiraling: Chapter 6
Patrick J. Mulholland, Donald L. DeAngelis
Jeremy B. Jones, Patrick J. Mulholland, editor(s)
2000, Book chapter, Streams and groundwaters
No abstract available....
Non-destructive measurement of soil liquefaction density change by crosshole radar tomography, Treasure Island, California
Robert E. Kayen, Walter A. Barnhardt, Scott Ashford, Kyle Rollins
2000, Book, Proceedings of Sessions of Geo-Denver 2000 - Computer Simulation of Earthquake Effects, GSP 110
A ground penetrating radar (GPR) experiment at the Treasure Island Test Site [TILT] was performed to non-destructively image the soil column for changes in density prior to, and following, a liquefaction event. The intervening liquefaction was achieved by controlled blasting. A geotechnical borehole radar technique was used to acquire high-resolution...
Macroinvertebrate assemblages on woody debris and their relations with environmental variables in the lower Sacramento and San Joaquin River drainages, California
L. R. Brown, J. T. May
2000, Environmental Monitoring and Assessment (64) 311-329
Data from 25 sites were used to evaluate associations between macroinvertebrate assemblages on large woody debris (snags) and environmental variables in the lower San Joaquin and Sacramento River drainages in California as part of the U.S. Geological Survey's National Water Quality Assessment Program. Samples were collected from 1993 to 1995...
Corrosivities in a pilot-scale combustor of a British and two Illinois coals with varying chlorine contents
I.-M. Chou, J.M. Lytle, S.C. Kung, K.K. Ho
2000, Fuel Processing Technology (64) 167-176
Many US boiler manufacturers have recommended limits on the chlorine (Cl) content (< 0.25% or < 0.3%) of coals to be used in their boilers. These limits were based primarily on extrapolation of British coal data to predict the probable corrosion behavior of US coals. Even though Cl-related boiler corrosion...
Emplacement temperatures of the November 22, 1994 nuee ardente deposits, Merapi Volcano, Java
B. Voight, M.J. Davis
2000, Journal of Volcanology and Geothermal Research (100) 371-377
A study of emplacement temperatures was carried out for the largest of the 22 November 1994 nuée ardente deposits at Merapi Volcano, based mainly on the response of plastic and woody materials subjected to the hot pyroclastic current and the deposits, and to some extent on eyewitness observations. The study...
Molecular analysis of population genetic structure and recolonization of rainbow trout following the Cantara spill
J.L. Nielsen, Erika L. Heine, Christina A. Gan, Monique C. Fountain
2000, California Fish and Game (86) 21-40
Mitochondrial DNA (mtDNA) sequence and allelic frequency data for 12 microsatellite loci were used to analyze population genetic structure and recolonization by rainbow trout, Oncorhynchus mykiss, following the 1991 Cantara spill on the upper Sacramento River, California. Genetic analyses were performed on 1,016 wild rainbow trout collected between...
Responses of physical, chemical, and biological indicators of water quality to a gradient of agricultural land use in the Yakima River Basin, Washington
T. F. Cuffney, M. R. Meador, S. D. Porter, M. E. Gurtz
2000, Environmental Monitoring and Assessment (64) 259-270
The condition of 25 stream sites in the Yakima River Basin, Washington, were assessed by the U.S. Geological Survey's National Water-Quality Assessment Program. Multimetric condition indices were developed and used to rank sites on the basis of physical, chemical, and biological characteristics. These indices showed that sites in the Cascades...
Composition of fish communities in relation to stream acidification and habitat in the Neversink River, New York
Barry P. Baldigo, G.B. Lawrence
2000, Transactions of the American Fisheries Society (129) 60-76
The effects of acidification in lotic systems are not well documented. Spatial and temporal variability of habitat and water quality complicate the evaluation of acidification effects in streams and rivers. The Neversink River in the Catskill Mountains of southeastern New York, the tributaries of which vary from well buffered to...
Combining binary decision tree and geostatistical methods to estimate snow distribution in a mountain watershed
Benjamin Balk, Kelly Elder
2000, Water Resources Research (36) 13-26
We model the spatial distribution of snow across a mountain basin using an approach that combines binary decision tree and geostatistical techniques. In April 1997 and 1998, intensive snow surveys were conducted in the 6.9‐km2 Loch Vale watershed (LVWS), Rocky Mountain National Park, Colorado. Binary decision trees were used to model...
Controls on nitrogen flux in alpine/subalpine watersheds of Colorado
Donald H. Campbell, Jill Baron, Kathy A. Tonnessen, Paul D. Brooks, Paul F. Schuster
2000, Water Resources Research (36) 37-47
High‐altitude watersheds in the Front Range of Colorado show symptoms of advanced stages of nitrogen excess, despite having less nitrogen in atmospheric deposition than other regions where watersheds retain nitrogen. In two alpine/subalpine subbasins of the Loch Vale watershed, atmospheric deposition of NO3− plus NH4+ was 3.2–5.5 kg N ha−1, and watershed...
A comparison in Colorado of three methods to monitor breeding amphibians
P.S. Corn, E. Muths, W.M. Iko
2000, Northwestern Naturalist (81) 22-30
We surveyed amphibians at 4 montane and 2 plains lentic sites in northern Colorado using 3 techniques: standardized call surveys, automated recording devices (frog-loggers), and intensive surveys including capture-recapture techniques. Amphibians were observed at 5 sites. Species richness varied from 0 to 4 species at each site. Richness scores, the...
Effect of elevation on distribution of female bats in the Black Hills, South Dakota
P.M. Cryan, M.A. Bogan, J.S. Altenbach
2000, Journal of Mammalogy (81) 719-725
Presumably, reproductive female bats are more constrained by thermoregulatory and energy needs than are males and nonreproductive females. Constraints imposed on reproductive females may limit their geographic distribution relative to other bats. Such constraints likely increase with latitude and elevation. Males of 11 bat species that inhabit the Black Hills...
Multicriteria decision analysis applied to Glen Canyon Dam
M. Flug, H.L.H. Seitz, J.F. Scott
2000, Journal of Water Resources Planning and Management (126) 270-276
Conflicts in water resources exist because river-reservoir systems are managed to optimize traditional benefits (e.g., hydropower and flood control), which are historically quantified in economic terms, whereas natural and environmental resources, including in-stream and riparian resources, are more difficult or impossible to quantify in economic terms. Multicriteria decision analysis provides...
Sensitivity of a high-elevation Rocky Mountain watershed to altered climate and CO2
Jill Baron, Melannie D. Hartman, L.E. Band, R.B. Lammers
2000, Water Resources Research (36) 89-99
We explored the hydrologic and ecological responses of a headwater mountain catchment, Loch Vale watershed, to climate change and doubling of atmospheric CO2 scenarios using the Regional Hydro-Ecological Simulation System (RHESSys). A slight (2°C) cooling, comparable to conditions observed over the past 40 years, led to greater snowpack and slightly...
Ecosystem responses to nitrogen deposition in the Colorado Front Range
Jill Baron, H.M. Rueth, A.M. Wolfe, K. R. Nydick, E.J. Allstott, J.T. Minear, B. Moraska
2000, Ecosystems (3) 352-368
We asked whether 3–5 kg N y−1 atmospheric N deposition was sufficient to have influenced natural, otherwise undisturbed, terrestrial and aquatic ecosystems of the Colorado Front Range by comparing ecosystem processes and properties east and west of the Continental Divide. The eastern side receives elevated N deposition from urban, agricultural,...
Management of land use conflicts in the United States Rocky Mountains
Jill Baron, D.M. Theobald, D.B. Fagre
2000, Mountain Research and Development (20) 24-27
People have long been attracted to the beauty and grandeur of the Rocky Mountains. Until very recently, however, the Rocky Mountain region was sparsely populated and its use mostly extractive. Commodities removed in massive quantities included first beaver, then precious metals, timber, energy, and finally water. There has been a...
[Book review] Theoretical Ecology Illustrated : An illustrated guide to theoretical ecology, by Ted J. Case
D.L. DeAngelis
2000, BioScience (50) 824-826
Review of: An Illustrated Guide to Theoretical Ecology. Ted J. Case. Oxford University Press, New York, 2000. 460 pp., illus. $45.00 (ISBN 0-19-508512-4 paper)....
Activity patterns of marbled murrelets in Douglas-fir old-growth forests of the Oregon Coast Range
Patrick G.R. Jodice, Michael W. Collopy
2000, The Condor (102) 275-285
We monitored activity patterns of Marbled Murrelets (Brachyramphus marmoratus) on a near-daily basis using audio-visual surveys during three breeding seasons at five forest stands in the Oregon Coast Range. Three measures of activity were recorded: number of daily detections, number of daily vocalizations, and duration of daily activity. Each...
Preface [to special section on recent Loch Vale Watershed research]
Jill S. Baron, Mark W. Williams
2000, Water Resources Research (36) 11-12
Catchment-scale intensive and extensive research conducted over the last decade shows that our understanding of the biogeochemical and hydrologic processes in subalpine and alpine basins is not yet sufficiently mature to model and predict how biogeochemical transformations and surface water quality will change in response to climatic or human-driven changes...
[Book review] The western range revisited, by D. L. Donahue
F.L. Knopf
2000, Journal of Wildlife Management (64) 1095-1097
Review of: The Western Range Revisited by D. L. Donahue. 1999. Norman, Oklahoma: University of Oklahoma Press. 388 pp. ISBN: 0-8061-3176-4 (Cloth)....
