The role of microbial reductive dechlorination of TCE at a phytoremediation site
E.M. Godsy, E. Warren, V.V. Paganelli
2003, International Journal of Phytoremediation (5) 73-87
In April 1996, a phytoremediation field demonstration site at the Naval Air Station, Fort Worth, Texas, was developed to remediate shallow oxic ground water (<3.7 m deep) contaminated with chlorinated ethenes. Microbial populations were sampled in February and June 1998. The populations under the newly planted cottonwood...
Zebra mussels (Dreissena polymorpha) limit food for larval fish (Pimephales promelas) in turbulent systems: A bioenergetics analysis
L.A. Bartsch, W. B. Richardson, M.B. Sandheinrich
2003, Hydrobiologia (495) 59-72
We conducted a factorial experiment, in outdoor mesocosms, on the effects of zebra mussels and water column mixing (i.e., turbulence) on the diet, growth, and survival of larval fathead minnows (Pimephales promelas). Significant (P < 0.05) larval mortality occurred by the end of the experiment with the highest mortality (90%)...
Hydric soils in a southeastern Oregon vernal pool
D. Clausnitzer, J.H. Huddleston, E. Horn, Michael Keller, C. Leet
2003, Soil Science Society of America Journal (67) 951-960
Vernal pools on the High Lava Plain of the northern Great Basin become ponded in most years, but their soils exhibit weak redoximorphic features indicative of hydric conditions. We studied the hydrology, temperature, redox potentials, soil chemistry, and soil morphology of a vernal pool to determine if the soils are...
Fleas (Siphonaptera) of the Allegheny woodrat (Neotoma magister) in West Virginia with comments on host specificity
S.B. Castleberry, N.L. Castleberry, P.B. Wood, W.M. Ford, M.T. Mengak
2003, American Midland Naturalist (149) 233-236
Previous research has indicated fewer host-specific ectoparasites on woodrats of the eastern United States as compared to western woodrat species. The Allegheny woodrat (Neotoma magister) is a species of conservation concern that is associated with rocky habitats in the Appalachian and Interior Highland regions in the eastern United States....
Incidence of Mink, Mustela vison, and River Otter, Lutra canadensis, in a highly urbanized area
L. David Mech
2003, Canadian Field-Naturalist (117) 115-116
Mink (Mustela vison) frequently inhabited or traversed a residential, business, and industrial part of the Twin Cities, Minnesota, with little water or natural vegetation. At least one River Otter (Lutra canadensis) also resided on a small pond on a golf course in the area for several winter months....
Metamorphic origin of ore-forming fluids for orogenic gold-bearing quartz vein systems in the North American Cordillera: constraints from a reconnaissance study of δ15N, δD, and δ18O
Y. Jia, R. Kerrich, R. Goldfarb
2003, Economic Geology (98) 109-123
The western North American Cordillera hosts a large number of gold-bearing quartz vein systems from the Mother Lode of southern California, through counterparts in British Columbia and southeastern Alaska, to the Klondike district in central Yukon. These vein systems are structurally controlled by major fault zones, which are often reactivated...
Age of the Mono Lake excursion and associated tephra
L. Benson, J. Liddicoat, J. Smoot, A. Sarna-Wojcicki, R. Negrini, S. Lund
2003, Quaternary Science Reviews (22) 135-140
The Mono Lake excursion (MLE) is an important time marker that has been found in lake and marine sediments across much of the Northern Hemisphere. Dating of this event at its type locality, the Mono Basin of California, has yielded controversial results with the most recent effort concluding that the...
Arctic transitions in the Land - Atmosphere System (ATLAS): Background, objectives, results, and future directions
A. D. McGuire, M. Sturm, F. S. Chapin III
2003, Journal of Geophysical Research D: Atmospheres (108)
This paper briefly reviews the background, objectives, and results of the Arctic Transitions in the Land-Atmosphere System (ATLAS) Project to date and provides thoughts on future directions. The key goal of the ATLAS Project is to improve understanding of controls over spatial and temporal variability of terrestrial processes in the...
Oxygen-18 concentrations in recent precipitation and ice cores on the Tibetan Plateau
L. Tian, T. Yao, P. F. Schuster, J.W.C. White, K. Ichiyanagi, Elise Pendall, J. Pu, W. Yu
2003, Journal of Geophysical Research D: Atmospheres (108)
A detailed study of the climatic significance of δ18O in precipitation was completed on a 1500 km southwest-northeast transect of the Tibetan Plateau in central Asia. Precipitation samples were collected at four meteorological stations for up to 9 years. This study shows that the gradual impact of monsoon precipitation...
Mass spectrometric identification of an azobenzene derivative produced by smectite-catalyzed conversion of 3-amino-4-hydroxyphenylarsonic acid
Robert L. Wershaw, David W. Rutherford, Colleen E. Rostad, John R. Garbarino, I. Ferrer, K. R. Kennedy, G.-M. Momplaisir, A. Grange
2003, Talanta (59) 1219-1226
The compound 3-amino-4-hydroxyphenylarsonic acid (3-amino-HPAA) reacts with smectite to form a soluble azobenzene arsonic acid compound. This reaction is of particular interest because it provides a possible mechanism for the formation of a new type of arsenic compound in natural water systems. 3-Amino-HPAA is a degradation product excreted by chickens...
Paleoearthquakes and Eolian-dominated fault sedimentation along the Hubbell Spring fault zone near Albuquerque, New Mexico
S. F. Personius, S. A. Mahan
2003, Bulletin of the Seismological Society of America (93) 1355-1369
The Hubbell Spring fault zone forms the modern eastern margin of the Rio Grande rift in the Albuquerque basin of north-central New Mexico. Knowledge of its seismic potential is important because the fault zone transects Kirtland Air Force Base/Sandia National Laboratories and underlies the southern Albuquerque metropolitan area. No earthquakes...
Biogeochemical sulphur cycle in an extreme environment - Life beneath a high arctic glacier, Nunavut, Canada
S.E. Grasby, C. C. Allen, T.G. Longazo, J.T. Lisle, Dale W. Griffin, B. Beauchamp
2003, Conference Paper, Journal of Geochemical Exploration
Unique springs discharge from the surface of a high arctic glacier, releasing H2S, and depositing native sulphur, gypsum, and calcite. A rare CaCO3 polymorph, vaterite, is also observed. Physical and chemical conditions of the spring water and surrounding environment, as well as mineralogical and isotopic signatures, argue for biologically mediated...
Physical and hydraulic properties of volcanic rocks from Yucca Mountain, Nevada
Lorraine E. Flint
2003, Water Resources Research (39) 1-1-1-13
A database of physical and hydraulic properties was developed for rocks in the unsaturated zone at Yucca Mountain, Nevada, a site under consideration as a geologic repository for high‐level radioactive waste. The 5320 core samples were collected from 23 shallow (<100 m) and 10 deep (500–1000 m) vertical boreholes. Hydrogeologic...
Implications of crustal permeability for fluid movement between terrestrial fluid reservoirs
S. E. Ingebritsen, C. E. Manning
2003, Conference Paper, Journal of Geochemical Exploration
A classic paper by Rubey [Geol. Soc. Amer. Bull 62 (1951) 1111] examined various hypotheses regarding the origin of sea water and concluded that the most likely hypothesis was volcanic outgassing, a view that was generally accepted by Earth scientists for the next several decades. More recent work suggests that...
Strong ground-motion prediction from Stochastic-dynamic source models
Mariagiovanna Guatteri, P.M. Mai, G. C. Beroza, J. Boatwright
2003, Bulletin of the Seismological Society of America (93) 301-313
In the absence of sufficient data in the very near source, predictions of the intensity and variability of ground motions from future large earthquakes depend strongly on our ability to develop realistic models of the earthquake source. In this article we simulate near-fault strong ground motion using dynamic source models....
Relation of age-0 largemouth bass abundance to hydrilla coverage and water level at Lochloosa and Orange Lakes, Florida
W.B. Tate, M. S. Allen, R.A. Myers, E.J. Nagid, J.R. Estes
2003, North American Journal of Fisheries Management (23) 251-257
Changes in electrofishing catch per hour (CPH) of age-0 largemouth bass Micropterus salmoides were examined in relation to aquatic macrophytes and seasonal water elevation at Lochloosa and Orange lakes, Florida, during the 1990s. At Lochloosa Lake, stepwise multiple regression revealed a significant positive relationship between the mean CPH of age-0...
Paleomagnetism and geochronology of an Early Proterozoic quartz diorite in the southern Wind River Range, Wyoming, USA
S. S. Harlan, J.W. Geisman, W. R. Premo
2003, Tectonophysics (362) 105-122
We present geochronologic and paleomagnetic data from a north-trending quartz diorite intrusion that cuts Archean metasedimentary and metaigneous rocks of the South Pass Greenstone Belt of the Wyoming craton. The quartz diorite was previously thought to be either Archean or Early Proterozoic (?) in age and is cut by north...
Use of sulfur and nitrogen stable isotopes to determine the importance of whitebark pine nuts to Yellowstone grizzly bears
L.A. Felicetti, C.C. Schwartz, R. O. Rye, M.A. Haroldson, K.A. Gunther, D.L. Phillips, C.T. Robbins
2003, Canadian Journal of Zoology (81) 763-770
Whitebark pine (Pinus albicaulis) is a masting species that produces relatively large, fat- and protein-rich nuts that are consumed by grizzly bears (Ursus arctos horribilis). Trees produce abundant nut crops in some years and poor crops in other years. Grizzly bear survival...
Erosion and sedimentation from the 17 July, 1998 Papua New Guinea tsunami
G. Gelfenbaum, B. Jaffe
2003, Pure and Applied Geophysics (160) 1969-1999
This paper describes erosion and sedimentation associated with the 17 July 1998 Papua New Guinea tsunami. Observed within two months of the tsunami, distinct deposits of a layer averaging 8-cm thick of gray sand rested on a brown muddy soil. In most cases the sand is normally graded, with more...
Using tree recruitment patterns and fire history to guide restoration of an unlogged ponderosa pine/Douglas‐fir landscape in the southern Rocky Mountains after a century of fire suppression
M. R. Kaufmann, L. S. Huckaby, P.J. Fornwalt, J. M. Stoker, W.H. Romme
2003, Forestry (76) 231-241
Tree age and fire history were studied in an unlogged ponderosa pine/Douglas‐fir ( Pinus ponderosa/Pseudotsuga menziesii ) landscape in the Colorado Front Range mountains. These data were analysed to understand tree survival during fire and post‐fire recruitment patterns after fire, as a basis for understanding the characteristics of, and restoration...
Structure, production and resource use in some old-growth spruce/fir forests in the front range of the Rocky Mountains, USA
Dan Binkley, U. Olsson, R. Rochelle, T. Stohlgren, N. Nikolov
2003, Forest Ecology and Management (172) 271-279
Old-growth forests of Engelmann spruce (Picea engelmannii Parry ex. Engelm.) and subalpine fir (Abies lasiocarpa (Hook.) Nutt.) dominate much of the landscape of the Rocky Mountains. We characterized the structure, biomass and production of 18 old-growth (200-450-year-old) spruce/fir forests in Rocky Mountain National Park, Colorado, as well as the stand-level...
Clinical pathology and assessment of pathogen exposure in southern and Alaskan sea otters
K.D. Hanni, J.A.K. Mazet, F.M.D. Gulland, James A. Estes, M. Staedler, M.J. Murray, Melissa A. Miller, David A. Jessup
2003, Journal of Wildlife Diseases (39) 837-850
The southern sea otter (Enhydra lutris nereis) population in California (USA) and the Alaskan sea otter (E. lutris kenyoni) population in the Aleutian Islands (USA) chain have recently declined. In order to evaluate disease as a contributing factor to the declines, health assessments of these two sea otter populations were...
A vegetation history from the arid prepuna of northern Chile (22-23°S) over the last 13,500 years
Claudio Latorre, Julio L. Betancourt, Kate A. Rylander, Jay Quade, Oscar Matthei
2003, Palaeogeography, Palaeoclimatology, Palaeoecology (194) 223-246
The Quaternary paleoclimate of the central Andes is poorly understood due to numerous discrepancies among the diverse proxy records that span this geographically and climatically complex region. The exact timing, duration and magnitude of wet and dry phases are seldom duplicated from one proxy type to another, and there have...
Use of sand wave habitats by silver hake
P.J. Auster, J. Lindholm, S. Schaub, G. Funnell, L.S. Kaufman, P. C. Valentine
2003, Journal of Fish Biology (62) 143-152
Silver hake Merluccius bilinearis are common members of fish communities in sand wave habitats on Georges Bank and on Stellwagen Bank in the Gulf of Maine. Observations of fish size v. sand wave period showed that silver hake are not randomly distributed within sand wave landscapes. Regression analyses showed a...
Photodegradation of roxarsone in poultry litter leachates
A.J. Bednar, J.R. Garbarino, I. Ferrer, D.W. Rutherford, R.L. Wershaw, J. F. Ranville, T.R. Wildeman
2003, Science of the Total Environment (302) 237-245
Arsenic compounds have been used extensively in agriculture in the US for applications ranging from cotton herbicides to animal feed supplements. Roxarsone (3-nitro-4-hydroxyphenylarsonic acid), in particular, is used widely in poultry production to control coccidial intestinal parasites. It is excreted unchanged in the manure and introduced into the environment when...
