Developing conceptual hydrogeological model for Potsdam sandstones in southwestern Quebec, Canada
Miroslav Nastev, R. Morin, Rejean Godin, Alain Rouleau
2008, Hydrogeology Journal (16) 373-388
A hydrogeological study was conducted in Potsdam sandstones on the international border between Canada (Quebec) and the USA (New York). Two sandstone formations, arkose and conglomerate (base) and well-cemented quartz arenite (upper), underlie the study area and form the major regional aquifer unit. Glacial till, littoral sand and gravel, and...
Empirical models to predict the volumes of debris flows generated by recently burned basins in the western U.S.
J.E. Gartner, S.H. Cannon, P.M. Santi, V.G. deWolfe
2008, Geomorphology (96) 339-354
Recently burned basins frequently produce debris flows in response to moderate-to-severe rainfall. Post-fire hazard assessments of debris flows are most useful when they predict the volume of material that may flow out of a burned basin. This study develops a set of empirically-based models that predict potential volumes of wildfire-related...
A two-part measure of degree of invasion for cross-community comparisons
Q. Guo, A. Symstad
2008, Conservation Biology (22) 666-672
Invasibility is a critical feature of ecological communities, especially for management decisions. To date, invasibility has been measured in numerous ways. Although most researchers have used the richness (or number) of exotic species as a direct or indirect measure of community invasibility, others have used alternative measures such as the...
The GIS Weasel: An interface for the development of geographic information used in environmental simulation modeling
Roland J. Viger
2008, Computers & Geosciences (34) 891-901
The GIS Weasel is a freely available, open-source software package built on top of ArcInfo Workstation?? [ESRI, Inc., 2001, ArcInfo Workstation (8.1 ed.), Redlands, CA] for creating maps and parameters of geographic features used in environmental simulation models. The software has been designed to minimize the need for GIS expertise...
Building model analysis applications with the Joint Universal Parameter IdenTification and Evaluation of Reliability (JUPITER) API
E. R. Banta, M. C. Hill, E. Poeter, J.E. Doherty, J. Babendreier
2008, Computers & Geosciences (34) 310-319
The open-source, public domain JUPITER (Joint Universal Parameter IdenTification and Evaluation of Reliability) API (Application Programming Interface) provides conventions and Fortran-90 modules to develop applications (computer programs) for analyzing process models. The input and output conventions allow application users to access various applications and the analysis methods they embody with...
The last 1000 years of natural and anthropogenic low-oxygen bottom-water on the Louisiana shelf, Gulf of Mexico
L.E. Osterman, R.Z. Poore, P.W. Swarzenski
2008, Marine Micropaleontology (66) 291-303
The relative abundance of three species of low-oxygen tolerant benthic foraminifers, the PEB index, in foraminiferal assemblages from sediment cores is used to trace the history of low-oxygen bottom-water conditions on the Louisiana shelf. Analyses of a network of box cores indicate that the modern zone of chronic seasonal hypoxia...
Scaling hyporheic exchange and its influence on biogeochemical reactions in aquatic ecosystems
Ben L. O’Connor, Judson W. Harvey
2008, Water Resources Research (44)
Hyporheic exchange and biogeochemical reactions are difficult to quantify because of the range in fluid‐flow and sediment conditions inherent to streams, wetlands, and nearshore marine ecosystems. Field measurements of biogeochemical reactions in aquatic systems are impeded by the difficulty of measuring hyporheic flow simultaneously with chemical gradients in sediments. Simplified...
Sandwave migration in Monterey Submarine Canyon, Central California
J. P. Xu, F. L. Wong, R. Kvitek, D.P. Smith, C. K. Paull
2008, Marine Geology (248) 193-212
Repeated high-resolution multibeam bathymetric surveys from 2002 through 2006 at the head of the Monterey Submarine Canyon reveal a sandwave field along the canyon axis between 20 and 250??m water depth. These sandwaves range in wavelength from 20 to 70??m and 1 to 3??m in height. A quantitative measure was...
New Orleans and Hurricane Katrina. IV: Orleans East Bank (Metro) protected basin
R.B. Seed, R.G. Bea, A. Athanasopoulos-Zekkos, G.P. Boutwell, J.D. Bray, C. Cheung, D. Cobos-Roa, J. Cohen-Waeber, B.D. Collins, L.F. Harder Jr., R. E. Kayen, J.M. Pestana, M.F. Riemer, J.D. Rogers, R. Storesund, X. Vera-Grunauer, Joseph Wartman
2008, Journal of Geotechnical and Geoenvironmental Engineering (134) 762-779
This paper addresses damage caused by Hurricane Katrina to the main Orleans East Bank protected basin. This basin represented the heart of New Orleans, and contained the main downtown area, the historic French Quarter, the Garden District, and the sprawling Lakefront and Canal Districts. Nearly half of the loss of...
Novel patterns of historical isolation, dispersal, and secondary contact across Baja California in the Rosy Boa (Lichanura trivirgata)
D.A. Wood, Robert N. Fisher, T.W. Reeder
2008, Molecular Phylogenetics and Evolution (46) 484-502
Mitochondrial DNA (mtDNA) sequence variation was examined in 131 individuals of the Rosy Boa (Lichanura trivirgata) from across the species range in southwestern North America. Bayesian inference and nested clade phylogeographic analyses (NCPA) were used to estimate relationships and infer evolutionary processes. These patterns were evaluated as they relate to...
Variations in pesticide leaching related to land use, pesticide properties, and unsaturated zone thickness
R.M.T. Webb, M.E. Wieczorek, B. T. Nolan, T.C. Hancock, Mark W. Sandstrom, J.E. Barbash, E.R. Bayless, R. W. Healy, J. Linard
2008, Journal of Environmental Quality (37) 1145-1157
Pesticide leaching through variably thick soils beneath agricultural fields in Morgan Creek, Maryland was simulated for water years 1995 to 2004 using LEACHM (Leaching Estimation and Chemistry Model). Fifteen individual models were constructed to simulate five depths and three crop rotations with associated pesticide applications. Unsaturated zone thickness averaged 4.7...
Hepatic heat shock protein 70 and plasma cortisol levels in rainbow trout after tagging with a passive integrated transponder
J.W. Feldhaus, S.A. Heppell, M.G. Mesa, H. Li
2008, Transactions of the American Fisheries Society (137) 690-695
This study examined the potentially stressful effects of tagging juvenile rainbow trout Oncorhynchus mykiss with passive integrated transponder (PIT) tags by measuring short-term (<120-h) changes in plasma concentrations of cortisol and hepatic heat shock protein 70 (hsp70). In a laboratory experiment, plasma cortisol levels were measured in fish before they...
High-resolution foraminiferal, isotopic, and trace element records from holocene estuarine deposits of San Francisco Bay, California
M. McGann
2008, Conference Paper, Journal of Coastal Research
A 3.5-m gravity core (DJ6-93SF-6) from San Francisco Bay reveals a complex paleoclimatic history of the region over the last 3870 cal YBP. A polynomial equation based on 11 AMS 14C ages provides an excellent age model for the core, and environmental proxies for water temperature and salinity are derived...
Isolation and characterization of microsatellite loci from the Arctic cisco (Coregonus autumnalis)
Andrew M. Ramey, S.L. Graziano, J.L. Nielsen
2008, Molecular Ecology Resources (8) 357-359
Eight polymorphic microsatellite loci were isolated and characterized for the Arctic cisco, Coregonus autumnalis. Loci were evaluated in 21 samples from the Colville River subsistence fishery. The number of alleles per locus ranged from two to 18. Observed heterozygosity of loci varied from 0.10 to 1.00, and expected heterozygosity ranged...
Families of miocene monterey crude oil, seep, and tarball samples, coastal California
K. E. Peters, F. D. Hostettler, T.D. Lorenson, R.J. Rosenbauer
2008, American Association of Petroleum Geologists Bulletin (92) 1131-1152
Biomarker and stable carbon isotope ratios were used to infer the age, lithology, organic matter input, and depositional environment of the source rocks for 388 samples of produced crude oil, seep oil, and tarballs to better assess their origins and distributions in coastal California. These samples were used to construct...
Comparison of visual survey and seining methods for estimating abundance of an endangered, benthic stream fish
F. Jordan, H.L. Jelks, S.A. Bortone, R.M. Dorazio
2008, Environmental Biology of Fishes (81) 313-319
We compared visual survey and seining methods for estimating abundance of endangered Okaloosa darters, Etheostoma okaloosae, in 12 replicate stream reaches during August 2001. For each 20-m stream reach, two divers systematically located and marked the position of darters and then a second crew of three to five people came...
Occurrence of volatile organic compounds in aquifers of the United States
Janet M. Carter, W.W. Lapham, J.S. Zogorski
2008, Journal of the American Water Resources Association (44) 399-416
Samples of ambient ground water were collected during 1985-2002 from 3,498 wells in 98 aquifer studies throughout the United States. None of the sampled wells were selected because of prior knowledge of nearby contamination. Most of these samples were analyzed for 55 volatile organic compounds (VOCs) to characterize their national...
Contrasting rainfall generated debris flows from adjacent watersheds at Forest Falls, southern California, USA
D. M. Morton, R.M. Alvarez, K.R. Ruppert, B. Goforth
2008, Geomorphology (96) 322-338
Debris flows are widespread and common in many steeply sloping areas of southern California. The San Bernardino Mountains community of Forest Falls is probably subject to the most frequently documented debris flows in southern California. Debris flows at Forest Falls are generated during short-duration high-intensity rains that mobilize surface material....
Chemical and mineralogical characteristics of French green clays used for healing
Lynda B. Williams, Shelley E. Haydel, Rossman F. Giese, Dennis D. Eberl
2008, Clays and Clay Minerals (56) 437-452
The worldwide emergence of infectious diseases, together with the increasing incidence of antibiotic-resistant bacteria, elevate the need to properly detect, prevent, and effectively treat these infections. The overuse and misuse of common antibiotics in recent decades stimulates the need to identify new inhibitory agents. Therefore, natural products like clays, that...
Evaluation of rules to distinguish unique female grizzly bears with cubs in Yellowstone
C.C. Schwartz, M.A. Haroldson, S. Cherry, K.A. Keating
2008, Journal of Wildlife Management (72) 543-554
The United States Fish and Wildlife Service uses counts of unduplicated female grizzly bears (Ursus arctos) with cubs-of-the-year to establish limits of sustainable mortality in the Greater Yellowstone Ecosystem, USA. Sightings are dustered into observations of unique bears based on an empirically derived rule set. The method has never been...
Abundances and isotopic compositions of rhenium and osmium in pyrite samples from the Huaibei coalfield, Anhui, China
Gaisheng Liu, C. L. Chou, Z. Peng, G. Yang
2008, International Journal of Earth Sciences (97) 617-621
Two pyrite samples from the Shihezi Formation (Lower Permian), Huaibei coalfield, Anhui, China, have been analyzed for abundances and isotopic compositions of rhenium and osmium using negative thermal ion mass spectrometry. The Re-Os ages of the pyrites are 64.4 and 226 Ma, which are younger than the formation age of...
Silurian gastropoda from southeastern and west-central Alaska
D.M. Rohr, R. B. Blodgett, J. Fryda
2008, Journal of Paleontology (82) 604-611
Additional Silurian (Ludlovian) gastropods are described from the Heceta Formation in the Alexander terrane on Prince of Wales Island, southeastern Alaska. Species include Spinicharybdis krizi n. sp., Spinicharybdis boucoti n. sp., Morania wagneri n. sp., Haplospira craigi n. sp., Australonema sp., Pachystrophia cf. gotlandica (Lindstro??m, 1884), and Medfrazyga gilmulli n....
Rapid growth of a Eurasian haplotype of Phragmites australis in a restored brackish marsh in Louisiana, USA
Rebecca J. Howard, Steven E. Travis, Benjamin A. Sikes
2008, Biological Invasions (10) 369-379
While numerous studies have documented patterns of invasion by non-indigenous plant species, few have considered the invasive properties of non-native genotypes of native species. Characteristics associated with specific genotypes, such as tolerance to disturbance, may mistakenly be applied to an entire species in the absence of genetic information, which consequently...
Regional groundwater flow in mountainous terrain: Three‐dimensional simulations of topographic and hydrogeologic controls
Tom Gleeson, Andrew H. Manning
2008, Water Resources Research (44)
This study uses numerical simulations to define the salient controls on regional groundwater flow in 3‐D mountainous terrain by systematically varying topographic and hydrogeologic variables. Topography for idealized multiple‐basin mountainous terrain is derived from geomatic data and literature values. Water table elevation, controlled by the ratio of...
A geophysical investigation of shallow deformation along an anomalous section of the Wasatch fault zone, Utah, USA
J.H. McBride, W. J. Stephenson, T.J. Thompson, M.P. Harper, A.A. Eipert, J.C. Hoopes, D.G. Tingey, R.W. Keach II, A. O. Okojie-Ayoro, K.L. Gunderson, C.D. Meirovitz, T.C. Hicks, C.J. Spencer, J.R. Yaede, D. M. Worley
2008, Conference Paper, Environmental and Engineering Geoscience
We report the results of a geophysical study of the Wasatch fault zone near the Provo and Salt Lake City segment boundary. This area is anomalous because the fault zone strikes more east-west than north-south. Vibroseis was used to record a common mid-point (CMP) profile that provides information to depths...
