Analysis of ambient conditions and simulation of hydrodynamics, constituent transport, and water-quality characteristics in Lake Maumelle, Arkansas, 1991-92
W. Reed Green
2001, Water-Resources Investigations Report 2001-4045
Lake Maumelle is the major drinking-water source for the Little Rock metropolitan area in central Arkansas. Urban and agricultural development has increased in the Lake Maumelle Basin and information is needed related to constituent transport and water quality response to changes in constituent loading or hydrologic regime. This report characterizes...
Online bibliography of Caretta caretta revised
C. Kenneth Dodd Jr.
2001, Marine Turtle Newsletter (91) 16
No abstract available....
Nitrogen input to the Gulf of Mexico
D. A. Goolsby, W.A. Battaglin, Brent T. Aulenbach, R. P. Hooper
2001, Conference Paper
Historical streamflow and concentration data were used in regression models to estimate the annual flux of nitrogen (N) to the Gulf of Mexico and to determine where the nitrogen originates within the Mississippi Basin. Results show that for 1980-1996 the mean annual total N flux to the Gulf of Mexico...
Development of channel organization and roughness following sediment pulses in single‐thread, gravel bed rivers
Mary Ann Madej
2001, Water Resources Research (37) 2259-2272
Large, episodic inputs of coarse sediment (sediment pulses) in forested, mountain streams may result in changes in the size and arrangement of bed forms and in channel roughness. A conceptual model of channel organization delineates trajectories of response to sediment pulses for many types of gravel bed channels. Channels exhibited...
Erosion and sediment delivery following removal of forest roads
Mary Ann Madej
2001, Earth Surface Processes and Landforms (26) 175-190
Erosion control treatments were applied to abandoned logging roads in California, with the goal of reducing road-related sediment input to streams and restoring natural hydrologic patterns on the landscape. Treatment of stream crossings involved excavating culverts and associated road fill and reshaping streambanks. A variety of techniques were applied to...
Precise K-Ar, 40Ar/39Ar, Rb-Sr and U/Pb mineral ages from the 27.5 Ma fish canyon tuff reference standard
M. A. Lanphere, H. Baadsgaard
2001, Chemical Geology (175) 653-671
The accuracy of ages measured using the 40Ar/39Ar technique is affected by uncertainties in the age of radiation fluence-monitor minerals. At present, there is lack of agreement about the ages of certain minerals used as fluence monitors. The accuracy of the age of a standard may be improved if the...
Nature reserves: Do they capture the full range of America's biological diversity?
J. M. Scott, Frank W. Davis, R.G. McGhie, R.G. Wright, C. Groves, John Estes
2001, Ecological Applications (11) 999-1007
Less than 6% of the coterminous United States is in nature reserves. Assessment of the occurrence of nature reserves across ranges of elevation and soil productivity classes indicates that nature reserves are most frequently found at higher elevations and on less productive soils. The distribution of plants and animals suggests...
Eddy covariance measurement of CO2 flux to the atmosphere from a area of high volcanogenic emissions, Mammoth Mountain, California
Dean E. Anderson, Christopher D. Farrar
2001, Chemical Geology (177) 31-42
Three pilot studies were performed to assess application of the eddy covariance micrometeorological method in the measurement of carbon dioxide (CO2) flux of volcanic origin. The selected study area is one of high diffuse CO2 emission on Mammoth Mountain, CA. Because terrain and source characteristics make this a complex setting for...
Desertification and a shift of forest species in the West African Sahel
Patrick Gonzalez
2001, Climate Research (17) 217-228
Original field data show that forest species richness and tree density in the West African Sahel declined in the last half of the 20th century. Average forest species richness of areas of 4 km2 in Northwest Senegal fell from 64 ?? 2 species ca 1945 to 43 ?? 2 species...
Singular spectrum analysis for time series with missing data
D. H. Schoellhamer
2001, Geophysical Research Letters (28) 3187-3190
Geophysical time series often contain missing data, which prevents analysis with many signal processing and multivariate tools. A modification of singular spectrum analysis for time series with missing data is developed and successfully tested with synthetic and actual incomplete time series of suspended-sediment concentration from San Francisco Bay. This method...
Arsenic in glacial drift aquifers and the implication for drinking water - Lower Illinois River Basin
K.L. Warner
2001, Ground Water (39) 433-442
The lower Illinois River Basin (LIRB) covers 47,000 km2 of central and western Illinois. In the LIRB, 90% of the ground water supplies are from the deep and shallow glacial drift aquifers. The deep glacial drift aquifer (DGDA) is below 152 m altitude, a sand and gravel deposit that fills the...
Use of radium isotopes to determine the age and origin of radioactive barite at oil-field production sites
R. A. Zielinski, J. K. Otton, J. R. Budahn
2001, Environmental Pollution (113) 299-309
Radium-bearing barite (radiobarite) is a common constituent of scale and sludge deposits that form in oil-field production equipment. The barite forms as a precipitate from radium-bearing, saline formation water that is pumped to the surface along with oil. Radioactivity levels in some oil-field equipment and in soils contaminated by scale...
Post-caldera volcanism: In situ measurement of U-Pb age and oxygen isotope ratio in Pleistocene zircons from Yellowstone caldera
I.N. Bindeman, J.W. Valley, J. L. Wooden, H.M. Persing
2001, Earth and Planetary Science Letters (189) 197-206
The Yellowstone Plateau volcanic field, the site of some of the largest known silicic volcanic eruptions, is the present location of NE-migrating hotspot volcanic activity. Most volcanic rocks in the Yellowstone caldera (0.6 Ma), which formed in response to the climactic eruption of 1000 km3 of Lava Creek Tuff (LCT),...
Upper crustal structure in Puget Lowland, Washington: Results from the 1998 Seismic Hazards Investigation in Puget Sound
T.M. Brocher, T. Parsons, R.J. Blakely, N.I. Christensen, M. A. Fisher, R.E. Wells, Uri S. ten Brink, T. L. Pratt, R. S. Crosson, K. C. Creager, N. P. Symons, L.A. Preston, T. Van Wagoner, K.C. Miller, C.M. Snelson, A.M. Trehu, V.E. Langenheim, G.D. Spence, K. Ramachandran, R.A. Hyndman, D. C. Mosher, B.C. Zelt, C.S. Weaver
2001, Journal of Geophysical Research B: Solid Earth (106) 13541-13564
A new three-dimensional (3-D) model shows seismic velocities beneath the Puget Lowland to a depth of 11 km. The model is based on a tomographic inversion of nearly one million first-arrival travel times recorded during the 1998 Seismic Hazards Investigation in Puget Sound (SHIPS), allowing higher-resolution mapping of subsurface structures...
Genetic characterization of hybridization and introgression between anadromous rainbow trout (oncorhynchus mykiss irideus) and coastal cutthroat trout (o. clarki clarki)
W.P. Young, C.O. Ostberg, P. Keim, G.H. Thorgaard
2001, Molecular Ecology (10) 921-930
Interspecific hybridization represents a dynamic evolutionary phenomenon and major conservation problem in salmonid fishes. In this study we used amplified fragment length polymorphisms (AFLP) and mitochondrial DNA (mtDNA) markers to describe the extent and characterize the pattern of hybridization and introgression between coastal rainbow trout (Oncorhynchus mykiss irideus) and coastal...
Estimation of population size using open capture-recapture models
T. L. McDonald, Steven C. Amstrup
2001, Journal of Agricultural, Biological, and Environmental Statistics (6) 206-220
One of the most important needs for wildlife managers is an accurate estimate of population size. Yet, for many species, including most marine species and large mammals, accurate and precise estimation of numbers is one of the most difficult of all research challenges. Open-population capture-recapture models have proven useful in...
Remnant colloform pyrite at the haile gold deposit, South Carolina: A textural key to genesis
N. Foley, R. A. Ayuso, R.R. Seal II
2001, Economic Geology (96) 891-902
Auriferous iron sulfide-bearing deposits of the Carolina slate belt have distinctive mineralogical and textural features-traits that provide a basis to construct models of ore deposition. Our identification of paragenetically early types of pyrite, especially remnant colloform, crustiform, and layered growth textures of pyrite containing electrum and pyrrhotite, establishes unequivocally that...
Determination of element affinities by density fractionation of bulk coal samples
X. Querol, Z. Klika, Z. Weiss, R. B. Finkelman, A. Alastuey, R. Juan, A. Lopez-Soler, F. Plana, A. Kolker, S.R.N. Chenery
2001, Fuel (80) 83-96
A review has been made of the various methods of determining major and trace element affinities for different phases, both mineral and organic in coals, citing their various strengths and weaknesses. These include mathematical deconvolution of chemical analyses, direct microanalysis, sequential extraction procedures and density fractionation. A new methodology combining...
Variations in creep rate along the Hayward Fault, California, interpreted as changes in depth of creep
R.W. Simpson, J. J. Lienkaemper, J.S. Galehouse
2001, Geophysical Research Letters (28) 2269-2272
Variations ill surface creep rate along the Hayward fault are modeled as changes in locking depth using 3D boundary elements. Model creep is driven by screw dislocations at 12 km depth under the Hayward and other regional faults. Inferred depth to locking varies along strike from 4-12 km. (12 km...
Geographic variation in the song of Willow Flycatchers: Differentiation between Empidonax traillii adastus and E. t. extimus
J.A. Sedgwick
2001, The Auk (118) 366-379
The vocal signatures of the primary song form (“fitz-bew”) of the endangered Southwestern Willow Flycatcher (Empidonax traillii extimus) and its northern counterpart, E. t. adastus, are distinctive. Songs of the extimus subspecies are longer (total song, note, internote) and frequencies at maximum amplitude are lower than those of adastus. I...
Pleurochrysis pseudoroscoffensis (Prymnesiophyceae) blooms on the surface of the Salton Sea, California
Kristen M. Reifel, M. P. McCoy, M. A. Tiffany, Tonie E. Rocke, Charles Trees, S. B. Barlow, D. J. Faulkner, S. H. Hurlbert
2001, Hydrobiologia (466) 177-185
Dense populations of the coccolithophore Pleurochrysis pseudoroscoffensis were found in surface films at several locations around the Salton Sea in February–August, 1999. An unidentified coccolithophorid was also found in low densities in earlier studies of the lake (1955–1956). To our knowledge, this is the first record of this widespread marine species in...
Length changes in white sturgeon larvae preserved in ethanol or formaldehyde
J.M. Bayer, T.D. Counihan
2001, Collection Forum (15) 57-64
We examined the effects of two preservatives on the notochord and total lengths of white sturgeon (Acipenser transmontanus) larvae. White sturgeon larvae that were one, seven, and 14 days old were measured live and then preserved in 95% ethanol or 10% formaldehyde. Length changes were then determined at 20 and...
Efficacy of a DNA vaccine against infectious hematopoietic necrosis virus
G. Kurath, S. Corbeil, Eric Anderson, S. E. LaPatra
2001, Book chapter, Bulletin national research institute aquaculture, supplement
No abstract available ...
The adventive status of Salvinia minima and S. molesta in the southern United States and the related distribution of the weevil Cyrtobagous salviniae
C.C. Jacono, T.R. Davern, Ted D. Center
2001, Castanea (66) 214-226
Abstract not supplied at this time...
Archaic agencies, muddled missions, and conservation in the 21st century
Fred B. Samson, Fritz L. Knopf
2001, BioScience (51) 869-873
No abstract available....
