Smallmouth bass and largemouth bass predation on juvenile Chinook salmon and other salmonids in the Lake Washington basin
R.A. Tabor, B.A. Footen, K.L. Fresh, M.T. Celedonia, F. Mejia, D.L. Low, L. Park
2007, North American Journal of Fisheries Management (27) 1174-1188
We assessed the impact of predation by smallmouth bass Micropterus dolomieu and largemouth bass M. salmoides on juveniles of federally listed Chinook salmon Oncorhynchus tshawytscha and other anadromous salmonid populations in the Lake Washington system. Bass were collected with boat electrofishing equipment in the south end of Lake Washington (February-June)...
Physical and chemical controls on the critical zone
S.P. Anderson, F. Von Blanckenburg, A. F. White
2007, Elements (3) 315-319
Geochemists have long recognized a correlation between rates of physical denudation and chemical weathering. What underlies this correlation? The Critical Zone can be considered as a feed-through reactor. Downward advance of the weathering front brings unweathered rock into the reactor. Fluids are supplied through precipitation. The reactor is stirred at...
CO2 transport over complex terrain
Jielun Sun, Sean P. Burns, A.C. Delany, S.P. Oncley, A.A. Turnipseed, B.B. Stephens, D.H. Lenschow, M.A. LeMone, Russell K. Monson, D.E. Anderson
2007, Agricultural and Forest Meteorology (145) 1-21
CO2 transport processes relevant for estimating net ecosystem exchange (NEE) at the Niwot Ridge AmeriFlux site in the front range of the Rocky Mountains, Colorado, USA, were investigated during a pilot experiment. We found that cold, moist, and CO2-rich air was transported downslope at night and upslope in the early...
Modeling the influence of river discharge on salt intrusion and residual circulation in Danshuei River estuary, Taiwan
W.-C. Liu, W.-B. Chen, R. T. Cheng, M.-H. Hsu, A.Y. Kuo
2007, Continental Shelf Research (27) 900-921
A 3-D, time-dependent, baroclinic, hydrodynamic and salinity model was implemented and applied to the Danshuei River estuarine system and the adjacent coastal sea in Taiwan. The model forcing functions consist of tidal elevations along the open boundaries and freshwater inflows from the main stream and major tributaries in the Danshuei...
Ranking Alaska moose nutrition: Signals to begin liberal antlerless harvests
Rodney D. Boertje, Kalin A. Kellie, C. Tom Seaton, Mark A. Keech, Donald D. Young, Bruce W. Dale, Layne G. Adams, Andrew R. Aderman
2007, Journal of Wildlife Management (71) 1494-1506
We focused on describing low nutritional status in an increasing moose (Alces alces gigas) population with reduced predation in Game Management Unit (GMU) 20A near Fairbanks, Alaska, USA. A skeptical public disallowed liberal antlerless harvests of this moose population until we provided convincing data on low nutritional status. We ranked...
Numerical investigation of implementation of air-earth boundary by acoustic-elastic boundary approach
Y. Xu, J. Xia, R. D. Miller
2007, Geophysics (72)
The need for incorporating the traction-free condition at the air-earth boundary for finite-difference modeling of seismic wave propagation has been discussed widely. A new implementation has been developed for simulating elastic wave propagation in which the free-surface condition is replaced by an explicit acoustic-elastic boundary. Detailed comparisons of seismograms with...
A simulation-based approach for estimating premining water quality: Red Mountain Creek, Colorado
Robert L. Runkel, Briant A Kimball, Katherine Walton-Day, Philip L. Verplanck
2007, Applied Geochemistry (22) 1899-1918
Regulatory agencies are often charged with the task of setting site-specific numeric water quality standards for impaired streams. This task is particularly difficult for streams draining highly mineralized watersheds with past mining activity. Baseline water quality data obtained prior to mining are often non-existent and application of generic water quality...
Responses of California Brown Pelicans to disturbances at a large Oregon roost
Sadie K. Wright, D.D. Roby, R.G. Anthony
2007, Waterbirds (30) 479-487
Numbers of California Brown Pelicans (Pelecanus occidentalis californicus) along the coast of Oregon and Washington have increased sharply in recent years. We identified East Sand Island in the Columbia River estuary as the site of the largest pelican roost within this region. Numbers of pelicans roosting on East Sand Island...
Crossing disciplines and scales to understand the critical zone
S.L. Brantley, M. B. Goldhaber, Ragnarsdottir K. Vala
2007, Elements (3) 307-314
The Critical Zone (CZ) is the system of coupled chemical, biological, physical, and geological processes operating together to support life at the Earth's surface. While our understanding of this zone has increased over the last hundred years, further advance requires scientists to cross disciplines and scales to integrate understanding of...
Mass dynamics of wintering Pacific Black Brant: Body, adipose tissue, organ, and muscle masses vary with location
D.D. Mason, P.S. Barboza, David H. Ward
2007, Canadian Journal of Zoology (85) 728-736
We compared body size and mass of the whole body, organs, adipose tissue, and muscles of adult Pacific Black Brant (Branta bernicla nigricans (Lawrence, 1846)) collected concurrently in Alaska and Baja California during the fall, winter, and spring of 2002–2003. Head and tarsal lengths of males were similar between sites...
Fluid chemistry and evolution of hydrothermal fluids in an Archaean transcrustal fault zone network: The case of the Cadillac Tectonic Zone, Abitibi greenstone belt, Canada
P. Neumayr, S.G. Hagemann, D.A. Banks, B.W.D. Yardley, J.-F. Couture, G. P. Landis, R. Rye
2007, Canadian Journal of Earth Sciences (44) 745-773
Detailed fluid geochemistry studies on hydrothermal quartz veins from the Rouyn-Noranda and Val-d'Or areas along the transcrustal Cadillac Tectonic Zone (CTZ) indicate that unmineralized (with respect to gold) sections of the CTZ contained a distinct CO2-dominated, H2S-poor hydrothermal fluid. In contrast, both gold mineralized sections of the CTZ (e.g., at...
Upper cretaceous microbial petroleum systems in north-central Montana
Paul G. Lillis
2007, Mountain Geologist (44) 11-35
Cenomanian to Campanian rocks of north-central Montana contain shallow economic accumulations of dry natural gas derived from microbial methanogenesis. The methanogens utilized carbon dioxide derived from organic matter in the marginal marine sediments and hydrogen from in situ pore water to generate methane. The most recent USGS assessment of the shallow...
Regression models for estimating coseismic landslide displacement
R.W. Jibson
2007, Engineering Geology (91) 209-218
Newmark's sliding-block model is widely used to estimate coseismic slope performance. Early efforts to develop simple regression models to estimate Newmark displacement were based on analysis of the small number of strong-motion records then available. The current availability of a much larger set of strong-motion records dictates that these regression...
Anaerobic biodegradation and hydrogeochemical controls on natural attenuation of trichloroethene in an inland forested wetland
M.M. Lorah, L.J. Dyer, D.R. Burris
2007, Bioremediation Journal (11) 85-102
Anaerobic biodegradation was conducted in a forested wetland where a plume of trichloroethylene discharges from a sand aquifer through organic-rich wetland and stream-bottom sediments. The rapid response of the wetland hydrology to precipitation events altered groundwater flow and geochemistry during wet conditions in the spring compared to the drier conditions...
Oil and gas geochemistry and petroleum systems of the Fort Worth Basin
R.J. Hill, D.M. Jarvie, J. Zumberge, M. Henry, R. M. Pollastro
2007, American Association of Petroleum Geologists Bulletin (91) 445-473
Detailed biomarker and light hydrocarbon geochemistry confirm that the marine Mississippian Barnett Shale is the primary source rock for petroleum in the Fort Worth Basin, north-central Texas, although contributions from other sources are possible. Biomarker data indicate that the main oil-generating Barnett Shale facies is marine and was deposited under...
Local annual survival and seasonal residency rates of Semipalmated Sandpipers (Calidris pusilla) in Puerto Rico
S.M. Rice, J.A. Collazo, M.W. Alldredge, B. A. Harrington, A.R. Lewis
2007, The Auk (124) 1397-1406
We report seasonal residency and local annual survival rates of migratory Semipalmated Sandpipers (Calidris pusilla) at the Cabo Rojo salt flats, Puerto Rico. Residency rate (daily probability of remaining on the flats) was 0.991 ± 0.001 (x̄ ± SE), yielding a mean length of stay of 110 days. This finding...
The investigation of chemical structure of coal macerals via transmitted-light FT-IR microscopy by X. Sun
J.C. Hower, I. Suarez-Ruiz, Maria Mastalerz, A.C. Cook
2007, Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy (67) 1433-1437
A recent paper by Sun [X. Sun, Spectrochim. Acta A 62 (1-3) (2005) 557] attempts to characterize a variety of liptinite, termed "barkinite", from Chinese Permian coals. The component identified does not appear to fundamentally differ from previously-described liptinite macerals included in the International Committee for Coal and Organic Petrology's...
Thioarsenates in geothermal waters of Yellowstone National Park: Determination, preservation, and geochemical importance
B. Planer-Friedrich, J. London, R. Blaine McCleskey, D. Kirk Nordstrom, D. Wallschlager
2007, Environmental Science & Technology (41) 5245-5251
Mono-, di-, tri-, and tetrathioarsenate, as well as methylated arsenic oxy- and thioanions, were determined besides arsenite and arsenate in geothermal waters of Yellowstone National Park using anion-exchange chromatography inductively coupled plasma mass spectrometry. Retention time match with synthetic standards, measured S:As ratios, and molecular electrospray mass spectra support the...
Simultaneous determination of Cr(iii) and Cr(vi) using reversed-phased ion-pairing liquid chromatography with dynamic reaction cell inductively coupled plasma mass spectrometry
R.E. Wolf, J.M. Morrison, M. B. Goldhaber
2007, Journal of Analytical Atomic Spectrometry (22) 1051-1060
A method for the simultaneous determination of Cr(iii) and Cr(vi) species in waters, soil leachates and synthetic bio-fluids is described. The method uses reversed-phase ion-pairing liquid chromatography to separate the chromium species and a dynamic reaction cell (DRC??) equipped ICP-MS for detection of chromium. Separation of the chromium species is...
Nanotechnology - An emerging technology
D. Buckingham
2007, Mining Engineering (59) 23-29
The science of nanotechnology is still in its infancy. However, progress is being made in research and development of potential beneficial properties of nanomaterials that could play an integral part in the development of new and changing uses for mineral commodities. Nanotechnology is a kind of toolbox that allows industry...
Assessment of gaseous CO2 and AQUI-S as anesthetics when surgically implanting radio transmitters into cutthroat trout
T.B. Sanderson, W.A. Hubert
2007, North American Journal of Fisheries Management (27) 1053-1057
Tricaine methanesulfonate (MS-222) and CO2 are anesthetics that can be legally used in fisheries work in the United States, but they are limited in their field applications. A mandatory 21-d withdrawal period is required for fish exposed to MS-222. Carbon dioxide is not approved by the U.S. Food and Drug...
Juvenile densities relative to water regime in mainstem reservoirs of the Tennessee River, USA
L.E. Miranda, D.R. Lowery
2007, Lakes and Reservoirs: Research and Management (12) 87-96
Successful reproduction and development of strong year classes of fish in storage reservoirs are commonly associated with reproductive seasons of high water level and extensive flooding. Responses to flooding are likely to be less pronounced or altogether different in mainstem navigation reservoirs that experience limited water level fluctuation. In these...
Composite analysis for Escherichia coli at coastal beaches
E.E. Bertke
2007, Journal of Great Lakes Research (33) 335-341
At some coastal beaches, concentrations of fecal-indicator bacteria can differ substantially between multiple points at the same beach at the same time. Because of this spatial variability, the recreational water quality at beaches is sometimes determined by stratifying a beach into several areas and collecting a sample from each area...
Measurement of atmospheric mercury species with manual sampling and analysis methods in a case study in Indiana
M.R. Risch, E.M. Prestbo, L. Hawkins
2007, Water, Air, & Soil Pollution (184) 285-297
Ground-level concentrations of three atmospheric mercury species were measured using manual sampling and analysis to provide data for estimates of mercury dry deposition. Three monitoring stations were operated simultaneously during winter, spring, and summer 2004, adjacent to three mercury wet-deposition monitoring stations in northern, central, and southern Indiana. The monitoring...
Comparison of 15 evaporation methods applied to a small mountain lake in the northeastern USA
Donald O. Rosenberry, Thomas C. Winter, D.C. Buso, G.E. Likens
2007, Journal of Hydrology (340) 149-166
Few detailed evaporation studies exist for small lakes or reservoirs in mountainous settings. A detailed evaporation study was conducted at Mirror Lake, a 0.15 km2 lake in New Hampshire, northeastern USA, as part of a long-term investigation of lake hydrology. Evaporation was determined using 14 alternate evaporation methods during six...
