USGS national surveys and analysis projects: Preliminary compilation of integrated geological datasets for the United States
Suzanne W. Nicholson, Douglas B. Stoeser, Frederic H. Wilson, Connie L. Dicken, Steve Ludington
2007, Conference Paper
The growth in the use of Geographic nformation Systems (GS) has highlighted the need for regional and national digital geologic maps attributed with age and rock type information. Such spatial data can be conveniently used to generate derivative maps for purposes that include mineral-resource assessment, metallogenic studies, tectonic studies, human...
Mars global digital dune database and initial science results
Rosalyn K. Hayward, Kevin F. Mullins, Lori K. Fenton, Trent M. Hare, Timothy N. Titus, Mary C. Bourke, Anthony Colaprete, Phillip R. Christensen
2007, Journal of Geophysical Research E: Planets (112)
A new Mars Global Digital Dune Database (MGD3) constructed using Thermal Emission Imaging System (THEMIS) infrared (IR) images provides a comprehensive and quantitative view of the geographic distribution of moderate‐ to large‐size dune fields (area >1 km2) that will help researchers to understand global climatic and sedimentary processes that have...
40Ar/39Ar ages of the AD 79 eruption of Vesuvius, Italy
Marvin A. Lanphere, Duane E. Champion, Leone Melluso, Vincenzo Morra, Annamaria Perrotta, Claudio Scarpati, Dario Tedesco, Andrew T. Calvert
2007, Bulletin of Volcanology (69) 259-263
The Italian volcano, Vesuvius, erupted explosively in AD 79. Sanidine from pumice collected at Casti Amanti in Pompeii and Villa Poppea in Oplontis yielded a weighted-mean 40Ar/39Ar age of 1925±66 years in 2004 (1σ uncertainty) from incremental-heating experiments of eight aliquants of sanidine. This is the calendar age of the eruption....
Relationships of cadmium, mercury, and selenium with nutrient reserves of female lesser scaup (Aythya affinis) during winter and spring migration
M.J. Anteau, A. D. Afton, Christine M. Custer, T. W. Custer
2007, Environmental Toxicology and Chemistry (26) 515-520
Trace elements may have important effects on body condition of ducks during spring migration, because individuals are experiencing energetically costly events (e.g., migration, nutrient reserve accumulation, pair formation, feather molt, and ovarian follicle development). We examined relationships among hepatic cadmium, mercury, and selenium concentrations (microg/g dry wt) and nutrient reserves...
Understanding the genetic effects of recent habitat fragmentation in the context of evolutionary history: Phylogeography and landscape genetics of a southern California endemic Jerusalem cricket (Orthoptera: Stenopelmatidae: Stenopelmatus)
Amy G. Vandergast, A.J. Bohonak, D.B. Weissman, Robert N. Fisher
2007, Molecular Ecology (16) 977-992
Habitat loss and fragmentation due to urbanization are the most pervasive threats to biodiversity in southern California. Loss of habitat and fragmentation can lower migration rates and genetic connectivity among remaining populations of native species, reducing genetic variability and increasing extinction risk. However, it may be difficult to separate the...
Comparison of earthquake source spectra and attenuation in eastern North America and southeastern Australia
T.I. Allen, G. M. Atkinson
2007, Bulletin of the Seismological Society of America (97) 1350-1354
The paucity of ground-motion data in stable continental regions (SCRs) remains a key limitation when developing relations that seek to predict effects of strong ground shaking from large damaging earthquakes. It is desirable to combine data from more than one SCR to increase database size, but this raises questions as...
Littoral fish assemblages of the alien-dominated Sacramento-San Joaquin Delta, California, 1980-1983 and 2001-2003
L. R. Brown, D. Michniuk
2007, Estuaries and Coasts (30) 186-200
We analyzed monthly boat electrofishing data to characterize the littoral fish assemblages of five regions of the Sacramento-San Joaquin Delta (northern, southern, eastern, western, and central), California, during two sampling periods, 1980-1983 (1980s) and 2001-2003 (2000s), to provide information pertinent to the restoration of fish populations in this highly altered...
Paleoecology of the Late Pennsylvanian-age Calhoun coal bed and implications for long-term dynamics of wetland ecosystems
Debra A. Willard, T.L. Phillips, Alicia D. Lesnikowska, William A. DiMichele
2007, International Journal of Coal Geology (69) 21-54
Quantitative plant assemblage data from coal balls, miospores, megaspores, and compression floras from the Calhoun coal bed (Missourian) of the Illinois Basin (USA) are used to interpret spatial and temporal changes in plant communities in the paleo-peat swamp. Coal-ball and miospore floras from the Calhoun coal bed are dominated strongly...
Differential impacts of the southern pine beetle, Dendroctonus frontalis, on Pinus palustris and Pinus taeda
N.A. Friedenberg, B.M. Whited, D. H. Slone, S.J. Martinson, M.P. Ayres
2007, Canadian Journal of Forest Research (37) 1427-1437
Patterns of host use by herbivore pests can have serious consequences for natural and managed ecosystems but are often poorly understood. Here, we provide the first quantification of large differential impacts of the southern pine beetle, Dendroctonus frontalis Zimmermann, on loblolly pine, Pinus taeda L., and longleaf pine, Pinus palustris...
Geophysical data integration and conditional uncertainty analysis on hydraulic conductivity estimation
A. Rahman, F.T.-C. Tsai, C.D. White, D.A. Carlson, C. S. Willson
2007, Conference Paper, Examining the Confluence of Environmental and Water Concerns - Proceedings of the World Environmental and Water Resources Congress 2006
Integration of various geophysical data is essential to better understand aquifer heterogeneity. However, data integration is challenging because there are different levels of support between primary and secondary data needed to be correlated in various ways. This study proposes a geostatistical method to integrate the hydraulic conductivity measurements and electrical...
TerraLook: Providing easy, no-cost access to satellite images for busy people and the technologically disinclined
G.N. Geller, Eugene A. Fosnight, Sambhudas Chaudhuri
2007, Conference Paper, International Geoscience and Remote Sensing Symposium (IGARSS)
Access to satellite images has been largely limited to communities with specialized tools and expertise, even though images could also benefit other communities. This situation has resulted in underutilization of the data. TerraLook, which consists of collections of georeferenced JPEG images and an open source toolkit...
The energy radiated by the 26 December 2004 Sumatra-Andaman earthquake estimated from 10-minute P-wave windows
G. L. Choy, J. Boatwright
2007, Bulletin of the Seismological Society of America (97)
The rupture process of the Mw 9.1 Sumatra-Andaman earthquake lasted for approximately 500 sec, nearly twice as long as the teleseismic time windows between the P and PP arrival times generally used to compute radiated energy. In order to measure the P waves radiated by the entire earthquake, we analyze...
Sand deposition in shoreline eddies along five Wild and Scenic Rivers, Idaho
E.D. Andrews, K.R. Vincent
2007, River Research and Applications (23) 7-20
Sand bars deposited along the lateral margin of a river channel are frequently a focus of recreational activities. Sand bars are appealing sites on which to camp, picnic, fish and relax because they are relatively flat, soft, non-cohesive sand, free of vegetation and near the water's edge. The lack of...
The effects of flooding and sedimentation on seed germination of two bottomland hardwood tree species
Aaron R. Pierce, S.L. King
2007, Wetlands (27) 588-594
Flooding and sedimentation are two of the dominant disturbances that influence tree species composition and succession in floodplain forests. The importance of these disturbances may be most notable during the germination and establishment phases of plant succession. Channelization of most alluvial systems in the southeastern United States has caused dramatic...
Lithology-derived structure classification from the joint interpretation of magnetotelluric and seismic models
P. A. Bedrosian, N. Maercklin, U. Weckmann, Y. Bartov, T. Ryberg, O. Ritter
2007, Geophysical Journal International (170) 737-748
Magnetotelluric and seismic methods provide complementary information about the resistivity and velocity structure of the subsurface on similar scales and resolutions. No global relation, however, exists between these parameters, and correlations are often valid for only a limited target area. Independently derived inverse models from these methods can be combined...
Estimating fishing mortality, natural mortality, and selectivity using recoveries from tagging young fish
H. Jiang, C. Brownie, J.E. Hightower, K. H. Pollock
2007, North American Journal of Fisheries Management (27) 773-781
Current methods for estimation of age- and year-specific instantaneous mortality rates based on multiyear, multiple-age tagging studies assume that it is feasible to tag fish in a wide range of ages. For some species, however, only the youngest one or two age-classes are readily available for tagging. Given the practical...
The effect of Appalachian mountaintop mining on interior forest
James D. Wickham, K.H. Riitters, T.G. Wade, Michael Coan, Collin G. Homer
2007, Landscape Ecology (22) 179-187
Southern Appalachian forests are predominantly interior because they are spatially extensive with little disturbance imposed by other uses of the land. Appalachian mountaintop mining increased substantially during the 1990s, posing a threat to the interior character of the forest. We used spatial convolution to identify interior forest at multiple scales...
Historical trends in creel limits, length-based limits, and season restrictions for black basses in the United States and Canada
C. Paukert, M. McInerny, Ronald Schultz
2007, Fisheries (32) 62-72
We determined for largemouth bass (Micropterus salmoides), smallmouth bass (M. dolomeui), and spotted bass (M. punctulatus) historical trends in state- and province-wide creel limits, length limits, and season closures along with the rationale justifying these regulations. Based on data gathered via mail surveys and the Internet, 55 jurisdictions had state-...
A path-independent integral for the characterization of solute concentration and flux at biofilm detachments
B. Moran, S.S. Kulkarni, H. W. Reeves
2007, International Journal of Fracture (143) 291-300
A path-independent (conservation) integral is developed for the characterization of solute concentration and flux in a biofilm in the vicinity of a detachment or other flux limiting boundary condition. Steady state conditions of solute diffusion are considered and biofilm kinetics are described by an uptake term which can be expressed...
Conodont index fossil Hindeodus changxingensis Wang fingers greatest mass extinction event
I. Metcalfe, R.S. Nicoll, B. R. Wardlaw
2007, Palaeoworld (16) 202-207
The marine conodont fossil species, Hindeodus changxingensis Wang, that has a distinctive morphology, is restricted to a very narrow stratigraphic interval essentially from the Permian-Triassic extinction event through the internationally recognized boundary and into the very earliest Triassic. The species is geographically widespread in the Tethyan Region, from Italy to...
River plume patterns and dynamics within the Southern California Bight
J.A. Warrick, P.M. DiGiacomo, S.B. Weisberg, N.P. Nezlin, M. Mengel, B.H. Jones, J.C. Ohlmann, L. Washburn, E.J. Terrill, K.L. Farnsworth
2007, Continental Shelf Research (27) 2427-2448
Stormwater river plumes are important vectors of marine contaminants and pathogens in the Southern California Bight. Here we report the results of a multi-institution investigation of the river plumes across eight major river systems of southern California. We use in situ water samples from multi-day cruises in combination with MODIS...
Genotypes and phylogeographical relationships of infectious hematopoietic necrosis virus in California, USA
G.O. Kelley, C.M. Bendorf, S.C. Yun, Gael Kurath, R.P. Hedrick
2007, Diseases of Aquatic Organisms (77) 29-40
Infectious hematopoietic necrosis virus (IHNV) contains 3 major genogroups in North America with discreet geographic ranges designated as upper (U), middle (M), and lower (L). A comprehensive genotyping of 237 IHNV isolates from hatchery and wild salmonids in California revealed 25 different sequence types (a to y) all in the...
Evaluating the genetic relationships of the Mentasta and Nelchina caribou herds in Southcentral Alaska
2007, Conference Paper, Proceedings of 11th North American Caribou Workshop
No abstract available....
Near-infrared spectral mapping of Titan's mountains and channels
Jason W. Barnes, Jani Radebaugh, Robert H. Brown, Steve Wall, Laurence A. Soderblom, Jonathan I. Lunine, Devon M. Burr, Christophe Sotin, Stephane Le Mouelic, Sebastien Rodriguez, Bonnie J. Buratti, Roger N. Clark, Kevin H. Baines, Ralf Jaumann, Philip D. Nicholson, Randolph L. Kirk, Rosaly Lopes, Ralph D. Lorenz, Ken Mitchell, Charles A. Wood
2007, Journal of Geophysical Research E: Planets (112)
We investigate the spectral reflectance properties of channels and mountain ranges on Titan using data from Cassini's Visual and Infrared Mapping Spectrometer (VIMS) obtained during the T9 encounter (26 December 2005). We identify the location of channels and mountains using synthetic aperture radar maps obtained from Cassini's RADAR instrument during...
Pesticide and transformation product detections and age-dating relations from till and sand deposits
K.L. Warner, W.S. Morrow
2007, Journal of the American Water Resources Association (43) 911-922
Pesticide and transformation product concentrations and frequencies in ground water from areas of similar crop and pesticide applications may vary substantially with differing lithologies. Pesticide analysis data for atrazine, metolachlor, alachlor, acetochlor, and cyanazine and their pesticide transformation products were collected at 69 monitoring wells in Illinois and northern Indiana...
