Field-based evaluation of semipermeable membrane devices (SPMDs) as passive air samplers of polyaromatic hydrocarbons (PAHs)
M.E. Bartkow, J.N. Huckins, J.F. Muller
2004, Atmospheric Environment (38) 5983-5990
Semipermeable membrane devices (SPMDs) have been used as passive air samplers of semivolatile organic compounds in a range of studies. However, due to a lack of calibration data for polyaromatic hydrocarbons (PAHs), SPMD data have not been used to estimate air concentrations of target PAHs. In this study, SPMDs were...
California earthquake history
T. Toppozada, D. Branum
2004, Annals of Geophysics (47) 509-522
This paper presents an overview of the advancement in our knowledge of California's earthquake history since ??? 1800, and especially during the last 30 years. We first review the basic statewide research on earthquake occurrences that was published from 1928 through 2002, to show how the current catalogs and their...
A comparison of three fecal steroid metabolites for pregnancy detection used with single sampling in bighorn sheep (Ovis canadensis)
K.A. Schoenecker, R.O. Lyda, J. Kirkpatrick
2004, Journal of Wildlife Diseases (40) 273-281
We compared three fecal steroid metabolite assays for their usefulness in detecting pregnancy among free-ranging Rocky Mountain bighorn sheep (Ovis canadensis canadensis) from Bighorn Canyon National Recreation Area, Wyoming and Montana (USA) and captive bighorn ewes at ZooMontana in Billings, Montana. Fecal samples were collected from 11 free-ranging, radio-collared bighorn...
The effects of storms and storm-generated currents on sand beaches in Southern Maine, USA
H.W. Hill, J. T. Kelley, D. F. Belknap, S.M. Dickson
2004, Marine Geology (210) 149-168
Storms are one of the most important controls on the cycle of erosion and accretion on beaches. Current meters placed in shoreface locations of Saco Bay and Wells Embayment, ME, recorded bottom currents during the winter months of 2000 and 2001, while teams of volunteers profiled the topography of nearby...
Age structure and mortality of walleyes in Kansas reservoirs: Use of mortality caps to establish realistic management objectives
M.C. Quist, J.L. Stephen, C.S. Guy, R.D. Schultz
2004, North American Journal of Fisheries Management (24) 990-1002
Age structure, total annual mortality, and mortality caps (maximum mortality thresholds established by managers) were investigated for walleye Sander vitreus (formerly Stizostedion vitreum) populations sampled from eight Kansas reservoirs during 1991-1999. We assessed age structure by examining the relative frequency of different ages in the population; total annual mortality of...
Ecological correlates of fish movement in a network of Virginia streams
B. Albanese, P. L. Angermeier, S. Dorai-Raj
2004, Canadian Journal of Fisheries and Aquatic Sciences (61) 857-869
Identifying factors that influence fish movement is a key step in predicting how populations respond to environmental change. Using mark-recapture (four species) and trap capture (eight species) data, we examined relationships between three attributes of movement and 15 ecological variables. The probability of emigrating from a reach was positively related...
Reconstructing paleo lake levels from relict shorelines along the Upper Great Lakes
Steve J. Baedke, Todd A. Thompson, John W. Johnston, Douglas A. Wilcox
2004, Aquatic Ecosystem Health & Management (7) 435-449
Shorelines of the upper Great Lakes include many embayments that contain strandplains of beach ridges. These former shoreline positions of the lakes can be used to determine changes in the elevation of the lakes through time, and they also provide information on the warping of the ground surface that...
Nitrogen fluxes and retention in urban watershed ecosystems
P.M. Groffman, N.L. Law, K.T. Belt, L.E. Band, G. T. Fisher
2004, Ecosystems (7) 393-403
Although the watershed approach has long been used to study whole-ecosystem function, it has seldom been applied to study human-dominated systems, especially those dominated by urban and suburban land uses. Here we present 3 years of data on nitrogen (N) losses from one completely forested, one agricultural, and six urban/suburban...
Modeling the suppression of sea lamprey populations by the release of sterile males or sterile females
Waldemar Klassen, Jean V. Adams, Michael B. Twohey
2004, Journal of Great Lakes Research (30) 463-473
The suppressive effects of trapping adult sea lampreys, Petromyzon marinus Linnaeus, and releasing sterile males (SMRT) or females (SFRT) into a closed system were expressed in deterministic models. Suppression was modeled as a function of the proportion of the population removed by trapping, the number of sterile animals released, the...
Probabilistic assessment of precipitation-triggered landslides using historical records of landslide occurrence, Seattle, Washington
Jeffrey A. Coe, J. A. Michael, R. A. Crovelli, William U. Savage, W.D. Nashem, W.T. Laprade
2004, Environmental & Engineering Geoscience (10) 103-122
Ninety years of historical landslide records were used as input to the Poisson and binomial probability models. Results from these models show that, for precipitation-triggered landslides, approximately 9 percent of the area of Seattle has annual exceedance probabilities of 1 percent or greater. Application of the Poisson model for estimating...
Burrowing mayflies as indicators of ecosystem health: Status of populations in two western Lake Superior embayments
Thomas A. Edsall, Owen T. Gorman, Lori M. Evrard
2004, Aquatic Ecosystem Health & Management (7) 507-513
The U.S. Environmental Protection Agency and Environment Canada are supporting the development of indicators of ecosystem health that can be used to report on progress in restoring and maintaining the Great Lakes ecosystem, as called for in the Great Lakes Water Quality Agreement between the United States and Canada. One...
Geophysical data reveal the crustal structure of the Alaska Range orogen within the aftershock zone of the Mw 7.9 Denali fault earthquake
M. A. Fisher, N. A. Ratchkovski, W. J. Nokleberg, L. Pellerin, J.M.G. Glen
2004, Bulletin of the Seismological Society of America (94) S107-S131
Geophysical information, including deep-crustal seismic reflection, magnetotelluric (MT), gravity, and magnetic data, cross the aftershock zone of the 3 November 2002 Mw 7.9 Denali fault earthquake. These data and aftershock seismicity, jointly interpreted, reveal the crustal structure of the right-lateral-slip Denali fault and the eastern Alaska Range orogen, as well...
Distribution of total and methyl mercury in sediments along Steamboat Creek (Nevada, USA)
J. Stamenkovic, M.S. Gustin, M. C. Marvin-DiPasquale, B.A. Thomas, J.L. Agee
2004, Science of the Total Environment (322) 167-177
In the late 1800s, mills in the Washoe Lake area, Nevada, used elemental mercury to remove gold and silver from the ores of the Comstock deposit. Since that time, mercury contaminated waste has been distributed from Washoe Lake, down Steamboat Creek, and to the...
Temporal changes in water quality at a childhood leukemia cluster
R. L. Seiler
2004, Ground Water (42) 446-455
Since 1997, 15 cases of acute lymphocytic leukemia and one case of acute myelocytic leukemia have been diagnosed in children and teenagers who live, or have lived, in an area centered on the town of Fallon, Nevada. The expected rate for the population is about one case every five years....
Mapping of the Culann-Tohil region of Io from Galileo imaging data
D.A. Williams, Paul M. Schenk, Jeffrey M. Moore, Laszlo P. Keszthelyi, Elizabeth P. Turtle, Windy L. Jaeger, Jani Radebaugh, Moses P. Milazzo, Rosaly Lopes, Ronald Greeley
2004, Icarus (169) 80-97
We have used Galileo spacecraft data to produce a geomorphologic map of the Culann–Tohil region of Io's antijovian hemisphere. This region includes a newly discovered shield volcano, Tsũi Goab Tholus and a neighboring bright flow field, Tsũi Goab Fluctus, the active Culann Patera and the enigmatic Tohil Mons-Radegast Patera–Tohil Patera complex. Analysis...
Impacts of West Nile Virus on wildlife
E.K. Saito, M.A. Wild
2004, Park Science (22) 59-60
The recent epidemic of West Nile virus in the United States proved to be unexpectedly active and was the largest epidemic of the virus ever recorded. Much remains to be discovered about the ecology and epidemiology of West Nile virus in the United States, including which species are important in...
Complex proximal deposition during the Plinian eruptions of 1912 at Novarupta, Alaska
Bruce F. Houghton, C. J. N. Wilson, J. Fierstein, W. Hildreth
2004, Bulletin of Volcanology (66) 95-133
Proximal (<3 km) deposits from episodes II and III of the 60-h-long Novarupta 1912 eruption exhibit a very complex stratigraphy, the result of at least four transport regimes and diverse depositional mechanisms. They contrast with the relatively simple stratigraphy (and inferred emplacement mechanisms) for the previously documented, better known, medial-distal...
Methods for estimating adsorbed uranium(VI) and distribution coefficients of contaminated sediments
M. Kohler, G.P. Curtis, D.E. Meece, J.A. Davis
2004, Environmental Science & Technology (38) 240-247
Assessing the quantity of U(VI) that participates in sorption/desorption processes in a contaminated aquifer is an important task when investigating U migration behavior. U-contaminated aquifer sediments were obtained from 16 different locations at a former U mill tailings site at Naturita, CO (U.S.A.) and were extracted with an artificial groundwater,...
Holocene to Pliocene tectonic evolution of the region offshore of the Los Angeles urban corridor, southern California
R. G. Bohannon, J.V. Gardner, R. W. Sliter
2004, Tectonics (23)
Quaternary tectonism in the coastal belt of the Los Angeles urban corridor is diverse. In this paper we report the results of studies of multibeam bathymetry and a network of seismic reflection profiles that have been aimed at deciphering the diverse tectonism and at evaluating the relevance of published explanations...
Earthquake scenario and probabilistic ground-shaking hazard maps for the Albuquerque-Belen-Santa Fe, New Mexico, corridor
I. Wong, S. Olig, M. Dober, W. Silva, D. Wright, P. Thomas, N. Gregor, A. Sanford, K.-W. Lin, D. Love
2004, New Mexico Geology (26) 3-33
New Mexico's population is concentrated along the corridor that extends from Belen in the south to Española in the north and includes Albuquerque and Santa Fe. The Rio Grande rift, which encompasses the corridor, is a major tectonically, volcanically, and seismically active continental rift in the western U.S. Although only...
Systematic variation in the depths of slabs beneath arc volcanoes
P. England, R. Engdahl, W. Thatcher
2004, Geophysical Journal International (156) 377-408
The depths to the tops of the zones of intermediate-depth seismicity beneath arc volcanoes are determined using the hypocentral locations of Engdahl et al. These depths are constant, to within a few kilometres, within individual arc segments, but differ by tens of kilometres from one arc segment to another. The...
Earthquake source parameters determined by the SAFOD Pilot Hole seismic array
K. Imanishi, W.L. Ellsworth, S. G. Prejean
2004, Geophysical Research Letters (31)
We estimate the source parameters of #3 microearthquakes by jointly analyzing seismograms recorded by the 32-level, 3-component seismic array installed in the SAFOD Pilot Hole. We applied an inversion procedure to estimate spectral parameters for the omega-square model (spectral level and corner frequency) and Q to displacement amplitude spectra. Because...
Comparisons of fish species traits from small streams to large rivers
R. M. Goldstein, M. R. Meador
2004, Transactions of the American Fisheries Society (133) 971-983
To examine the relations between fish community function and stream size, we classified 429 lotic freshwater fish species based on multiple categories within six species traits: (1) substrate preference, (2) geomorphic preference, (3) trophic ecology, (4) locomotion morphology, (5) reproductive strategy, and (6) stream size preference. Stream size categories included...
The late cretaceous Donlin Creek gold deposit, Southwestern Alaska: Controls on epizonal ore formation
Richard J. Goldfarb, Robert A. Ayuso, Marti L. Miller, Shane W. Ebert, Erin E. Marsh, Scott A. Petsel, Lance D. Miller, Dwight Bradley, Chad Johnson, William C. McClelland
2004, Economic Geology (99) 643-671
The Donlin Creek gold deposit, southwestern Alaska, has an indicated and inferred resource of approximately 25 million ounces (Moz) Au at a cutoff grade of 1.5 g/t. The ca. 70 Ma deposit is hosted in the Late Cretaceous Kuskokwim flysch basin, which developed in the back part of the arc...
Degradates provide insight to spatial and temporal trends of herbicides in ground water
D.W. Kolpin, D.J. Schnoebelen, E.M. Thurman
2004, Groundwater (42) 601-608
Since 1995, a network of municipal wells in Iowa, representing all major aquifer types (alluvial, bedrock/karst region, glacial drift, bedrock/nonkarst region), has been repeatedly sampled for a broad suite of herbicide compounds yielding one of the most comprehensive statewide databases of such compounds currently available in the United States. This...
