Basis for paleoenvironmental interpretation of magnetic properties of sediment from Upper Klamath Lake (Oregon): Effects of weathering and mineralogical sorting
J. G. Rosenbaum, R. L. Reynolds
2004, Journal of Paleolimnology (31) 253-265
Studies of magnetic properties enable reconstruction of environmental conditions that affected magnetic minerals incorporated in sediments from Upper Klamath Lake. Analyses of stream sediment samples from throughout the catchment of Upper Klamath Lake show that alteration of Fe-oxide minerals during subaerial chemical weathering of basic volcanic rocks has significantly changed...
Foreword [to Canids: foxes, wolves, jackals, and dogs: status survey and conservation action plan]
L. David Mech
Claudio Sillero-Zubiri, Michael Hoffmann, David W. Macdonald, editor(s)
2004, Book chapter, Canids: foxes, wolves, jackals, and dogs: status survey and conservation action plan
Organochlorine compounds in Lake Superior: Chiral polychlorinated biphenyls and biotransformation in the aquatic food web
Charles S. Wong, Scott A. Mabury, D. Michael Whittle, Sean M. Backus, Camilla Teixeira, David S. DeVault, Charles R. Bronte, Derek C.G. Muir
2004, Environmental Science & Technology (38) 84-92
The enantiomeric composition of seven chiral PCB congeners was measured in the Lake Superior aquatic food web sampled in 1998, to determine the extent of enantioselective biotransformation in aquatic biota. All chiral PCB congeners studied (CBs 91, 95, 136, 149, 174, 176, and 183) biomagnified in the Lake Superior aquatic...
Effect of stock size, climate, predation, and trophic status on recruitment of alewives in Lake Ontario, 1978-2000
Robert O’Gorman, Brian F. Lantry, Clifford P. Schneider
2004, Transactions of the American Fisheries Society (133) 855-867
The population of alewives Alosa pseudoharengus in Lake Ontario is of great concern to fishery managers because alewives are the principal prey of introduced salmonines and because alewives negatively influence many endemic fishes. We used spring bottom trawl catches of alewives to investigate the roles of stock size, climate, predation, and lake...
A Holocene history of dune-mediated landscape change along the southeastern shore of Lake Superior
Walter L. Loope, Timothy G. Fisher, Harry M. Jol, John B. Anderton, William L. Blewett
2004, Geomorphology (61) 303-322
Causal links that connect Holocene high stands of Lake Superior with dune building, stream damming and diversion and reservoir impoundment and infilling are inferred from a multidisciplinary investigation of a small watershed along the SE shore of Lake Superior. Radiocarbon ages of wood fragments from in-place stumps and soil O...
Habitat selection by two species of burrowing mayfly nymphs in the Les Cheneaux Islands region of northern Lake Huron
Marc A. Blouin, Patrick Hudson, Margret Chriscinske
2004, Journal of Freshwater Ecology (19) 507-514
This study focused primarily on the habitat preferences of Hexagenia limbata andEphemera simulans, two species prevalent in northern Lake Huron, to gain a better understanding of the key components that determined their distribution and abundance. Both species preferred habitats based upon depth and sediment type. In addition, the burrowing activity of H. limbata was...
Time-dependent lethal body residues for the toxicity of pentachlorobenzene to Hyalella azteca
Peter F. Landrum, Jeffery A. Steevens, Duane C. Gossiaux, Michael McElroy, Sander Robinson, Linda Begnoche, Sergei Chernyak, James Hickey
2004, Environmental Toxicology and Chemistry (23) 1335-1343
The study examined the temporal response of Hyalella azteca to pentachlorobenzene (PCBZ) in water-only exposures. Toxicity was evaluated by calculating the body residue of PCBZ associated with survival. The concentration of PCBZ in the tissues of H. azteca associated with 50% mortality decreased from 3 to 0.5 μmol/g over the temporal range of 1...
Gene flow and genetic characterization of Northern Goshawks breeding in Utah
Sarah A. Sonsthagen, Sandra L. Talbot, C.M. White
2004, Condor (106) 826-836
Adult movement and natal dispersal data demonstrate that Northern Goshawks (Accipiter gentilis) are able to travel over long distances, suggesting a large functional population. However, these data are unable to determine whether these movements contribute to gene flow among adjacent breeding areas. We used eight microsatellite DNA loci and mitochondrial...
The importance of wood in headwater streams of the Oregon Coast Range
Christine May, Robert E. Gresswell, Janet L. Erickson
2004, Fact Sheet 2004-3055
Although headwater streams comprise the majority of stream length in mountainous regions, little is known about their form and function in comparison to higher-order rivers. A better understanding of the role of headwater streams in routing water, wood, and sediment is needed to clarify the physical and biological connections among...
New U-series dates at the Caune de l'Arago, France
Christophe Falgueres, Y. Yokoyama, G. Shen, James L. Bischoff, T.-L. Ku, Henry de Lumley
2004, Journal of Archaeological Science (31) 941-952
In the beginning of the 1980s, the Caune de l'Arago was the focus of an interdisciplinary effort to establish the chronology of the Homo heidelbergensis (Preneandertals) fossils using a variety of techniques on bones and on speleothems. The result was a very large spread of dates particularly on bone samples....
Use of remote sensing techniques to determine the effects of grazing on vegetation cover and dune elevation at assateague island national seashore: Impact of horses
G. H. De Stoppelaire, T.W. Gillespie, J. C. Brock, G.A. Tobin
2004, Environmental Management (34) 642-649
The effects of grazing by feral horses on vegetation and dune topography at Assateague Island National Seashore were investigated using color-infrared imagery, lidar surveys, and field measurements. Five pairs of fenced and unfenced plots (300 m2) established in 1993 on sand flats and small dunes with similar elevation, topography, and...
Nitrite toxicity of Litopenaeus vannamei in water containing low concentrations of sea salt or mixed salts
A. Sowers, S.P. Young, J. Jeffery Isely, C.L. Browdy, J.R. Tomasso Jr.
2004, Journal of the World Aquaculture Society (35) 445-451
The uptake, depuration and toxicity of environmental nitrite was characterized in Litopenaeus vannamei exposed in water containing low concentrations of artificial sea salt or mixed salts. In 2 g/L artificial sea salts, nitrite was concentrated in the hemolymph in a dose-dependent and rapid manner (steady-state in about 2 d). When...
Modeling the Death Valley regional ground-water flow system
F. A. D’Agnese, C.C. Faunt, M. C. Hill
2004, Conference Paper, Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships
The development of a regional ground-water flow model of the Death Valley region in the southwestern United States is discussed in the context of the fourteen guidelines of Hill. This application of the guidelines demonstrates how they may be used for model calibration and evaluation, and to direct further model...
Changes in the substrate of rivers in historic mining districts
R.T. Milhous
2004, Conference Paper, Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships
The restoration of rivers in watersheds with historic mining districts has become a topic of interest during the last decade. Rivers restoration in these areas is difficult because the mines and mills can be scattered over a wide area and often small. Many have also been abandoned. This paper presents...
Ice processes affect habitat use and movements of adult cutthroat trout and brook trout in a Wyoming foothills stream
J.W. Lindstrom, W.A. Hubert
2004, North American Journal of Fisheries Management (24) 1341-1352
Habitat use and movements of 25 adult cutthroat trout Oncorhynchus clarkii and 25 adult brook trout Salvelinus fontinalis from fall through winter 2002-2003 were assessed by means of radiotelemetry in a 7-km reach of a Rocky Mountains foothills stream. Temporal dynamics of winter habitat conditions were evaluated by regularly measuring...
An acoustic velocity measurement system for aiding barge traffic in the Colorado River locks near Matagorda, Texas
J. W. East, C. Scheffler
2004, Conference Paper, Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships
In July 1999, the U.S. Geological Survey installed an acoustic Doppler velocity meter in the Colorado River, near the city of Matagorda in southeast Texas. The meter is part of an integrated system used by the U.S. Army Corps of Engineers to control barge traffic that passes through a lock...
Application of near real-time radial semblance to locate the shallow magmatic conduit at Kilauea Volcano, Hawaii
P. Dawson, D. Whilldin, B. Chouet
2004, Geophysical Research Letters (31)
Radial Semblance is applied to broadband seismic network data to provide source locations of Very-Long-Period (VLP) seismic energy in near real time. With an efficient algorithm and adequate network coverage, accurate source locations of VLP energy are derived to quickly locate the shallow magmatic conduit system at Kilauea Volcano, Hawaii....
Chemistry of burning the forest floor during the FROSTFIRE experimental burn, interior Alaska, 1999
J.W. Harden, J. C. Neff, D. V. Sandberg, M.R. Turetsky, R. Ottmar, G. Gleixner, T. L. Fries, K.L. Manies
2004, Global Biogeochemical Cycles (18)
Wildfires represent one of the most common disturbances in boreal regions, and have the potential to reduce C, N, and Hg stocks in soils while contributing to atmospheric emissions. Organic soil layers of the forest floor were sampled before and after the FROSTFIRE experimental burn in interior Alaska, and were...
Predicting maternal body burdens of organochlorine pesticides from eggs and evidence of maternal transfer in Alligator mississippiensis
R.H. Rauschenberger, M. S. Sepulveda, J.J. Wiebe, N.J. Szabo, T. S. Gross
2004, Environmental Toxicology and Chemistry (23) 2906-2915
Few data exist regarding maternal-embryonal transfer of organochlorine pesticides (OCPs) in reptiles. The objective of the present study was to evaluate maternal transfer of OCPs in American alligators (Alligator mississippiensis) from low-, intermediate-, and high-OCP-exposure sites. Overall, total OCP burdens ranged from less than 0.8 ppb in blood to more...
Uranium adsorption on weathered schist - Intercomparison of modeling approaches
T.E. Payne, J.A. Davis, M. Ochs, M. Olin, C.J. Tweed
2004, Radiochimica Acta (92) 651-661
Experimental data for uranium adsorption on a complex weathered rock were simulated by twelve modelling teams from eight countries using surface complexation (SC) models. This intercomparison was part of an international project to evaluate the present capabilities and limitations of SC models in representing sorption by geologic materials. The models...
Age of the Rockland tephra, western USA
M. A. Lanphere, D.E. Champion, M.A. Clynne, J. B. Lowenstern, A.M. Sarna-Wojcicki, J. L. Wooden
2004, Quaternary Research (62) 94-104
The age of the Rockland tephra, which includes an ash-flow tuff south and west of Lassen Peak in northern <a title="Learn...
Long-term effects of flipper bands on penguins
M. Gauthier-Clerc, J.-P. Gendner, C. A. Ribic, William R. Fraser, Eric J. Woehler, S. Descamps, C. Gilly, Bohec C. Le, Maho Y. Le
2004, Proceedings of the Royal Society B: Biological Sciences (271)
Changes in seabird populations, and particularly of penguins, offer a unique opportunity for investigating the impact of fisheries and climatic variations on marine resources. Such investigations often require large-scale banding to identify individual birds, but the significance of the data relies on the assumption that no bias is introduced in...
A guided inquiry approach to learning the geology of the U.S
M.L. Leech, D. G. Howell, A.E. Egger
2004, Journal of Geoscience Education (52) 368-373
A guided inquiry exercise has been developed to help teach the geology of the U.S. This exercise is intended for use early in the school term when undergraduate students have little background knowledge of geology. Before beginning, students should be introduced to rock types and have a basic understanding of...
Record high Wolf, Canis lupus, pack density
L.D. Mech, S. Tracy
2004, Canadian Field-Naturalist (118) 127-129
This report documents a year-around Wolf (Canis lupus) density of 18.2/100 km2 and a summer density of 30.8/100 km2, in a northeastern Minnesota Wolf pack. The previous record was a summer density of 14.1/100 km2, for a Wolf pack on Vancouver Island, British Columbia, Canada....
Origin of placer laurite from Borneo: Se and As contents, and S isotopic compositions
K.H. Hattori, L.J. Cabri, B. Johanson, M. L. Zientek
2004, Mineralogical Magazine (68) 353-368
We examined grains of the platinum-group mineral, laurite (RuS2), from the type locality, Pontyn River, Tanah Laut, Borneo, and from the Tambanio River, southeast Borneo. The grains show a variety of morphologies, including euhedral grains with conchoidal fractures and pits, and spherical grains with no crystal faces, probably because of...
