Diverse dinosaur-dominated ichnofaunas from the Potomac Group (Lower Cretaceous) Maryland
Ray Stanford, Martin G. Lockley, Robert E. Weems
2007, Ichnos: An International Journal for Plant and Animal Traces (14) 155-173
Until recently fossil footprints were virtually unknown from the Cretaceous of the eastern United States. The discovery of about 300 footprints in iron-rich siliciclastic facies of the Patuxent Formation (Potomac Group) of Aptian age is undoubtedly one of the most significant Early Cretaceous track discoveries since the Paluxy track discoveries...
Assessment of contamination from arsenical pesticide use on orchards in the great valley region, Virginia and West Virginia, USA
Gilpin R. Robinson Jr., Peter Larkins, Carol J. Boughton, Bradley W. Reed, Philip L. Sibrell
2007, Journal of Environmental Quality (36) 654-663
Lead arsenate pesticides were widely used in apple orchards from 1925 to 1955. Soils from historic orchards in four counties in Virginia and West Virginia contained elevated concentrations of As and Pb, consistent with an arsenical pesticide source. Arsenic concentrations in approximately 50% of the orchard site soils and approximately...
Earthquake-by-earthquake fold growth above the Puente Hills blind thrust fault, Los Angeles, California: Implications for fold kinematics and seismic hazard
L.A. Leon, S.A. Christofferson, J.F. Dolan, J.H. Shaw, T. L. Pratt
2007, Journal of Geophysical Research B: Solid Earth (112)
Boreholes and high-resolution seismic reflection data collected across the forelimb growth triangle above the central segment of the Puente Hills thrust fault (PHT) beneath Los Angeles, California, provide a detailed record of incremental fold growth during large earthquakes on this major blind thrust fault. These data document fold growth within...
Responses of prairie arthropod communities to fire and fertilizer: Balancing plant and arthropod conservation
M.K. Hartley, W.E. Rogers, E. Siemann, J. Grace
2007, American Midland Naturalist (157) 92-105
Fire is an important tool for limiting woody plant invasions into prairies, but using fire management to maintain grassland plant communities may inadvertently reduce arthropod diversity. To test this, we established twenty-four 100 m2 plots in a tallgrass prairie in Galveston County, Texas, in spring 2000. Plots were assigned a...
Comparison of diet, reproductive biology, and growth of the pig frog (Rana grylio) from harvested and protected areas of the Florida Everglades
C.A. Ugarte, K.G. Rice, M.A. Donnelly
2007, Copeia 436-448
Distinct differences in body size exist among three Rana grylio populations in areas of the Florida Everglades that differ in frog harvest pressure and hydroperiod. Frogs from two populations are harvested regularly throughout the year, while those in the third are protected from harvest. We compared seasonal and sex differences...
Characterization of low-pathogenicity H5N1 avian influenza viruses from North America
Erica Spackman, D. E. Swayne, D. L. Suarez, D. A. Senne, J. C. Pedersen, M. L. Killian, J. Pasick, K. Handel, S. P. S. Pillai, C. #NAME? Lee, D. Stallknecht, R. Slemons, Hon S. Ip, T. Deliberto
2007, Journal of Virology (81) 11612-11619
Wild-bird surveillance in North America for avian influenza (AI) viruses with a goal of early identification of the Asian H5N1 highly pathogenic AI virus has identified at least six low-pathogenicity H5N1 AI viruses between 2004 and 2006. The hemagglutinin (HA) and neuraminidase (NA) genes from all 6 H5N1 viruses and...
Investigators share improved understanding of the North American carbon cycle
R.A. Birdsey, R. Cook, S. Denning, P. Griffith, B. Law, J. Masek, A. Michalak, S. Ogle, D. Ojima, Y. Pan, C. Sabine, E. Sheffner, E. Sundquist
2007, Conference Paper, Eos
[No abstract available]...
Biology and impacts of Pacific island invasive species. 2. Boiga irregularis, the Brown Tree Snake (Reptilia: Colubridae)
Gordon H. Rodda, Julie A. Savidge
2007, Pacific Science (61) 307-324
The Brown Tree Snake, Boiga irregularis (Merrem, 1802), was accidentally transported to the island of Guam shortly after World War II. Over the following two decades it spread throughout the island with little public or professional recognition of its extent or impacts. This secretive nocturnal arboreal snake occurs in all...
Oxygen and chlorine isotopic fractionation during perchlorate biodegradation: Laboratory results and implications for forensics and natural attenuation studies
Neil C. Sturchio, John Karl Bohlke, Abelardo D. Beloso Jr., S.H. Streger, Linnea J. Heraty, Paul B. Hatzinger
2007, Environmental Science & Technology (41) 2796-2802
Perchlorate is a widespread environmental contaminant having both anthropogenic and natural sources. Stable isotope ratios of O and Cl in a given sample of perchlorate may be used to distinguish its source(s). Isotopic ratios may also be useful for identifying the extent of biodegradation of perchlorate, which is critical for...
Digital floodplain mapping and an analysis of errors involved
C.S. Hamblen, D.T. Soong, X. Cai
2007, Conference Paper, Examining the Confluence of Environmental and Water Concerns - Proceedings of the World Environmental and Water Resources Congress 2006
Mapping floodplain boundaries using geographical information system (GIS) and digital elevation models (DEMs) was completed in a recent study. However convenient this method may appear at first, the resulting maps potentially can have unaccounted errors. Mapping the floodplain using GIS is faster than mapping manually, and digital mapping is expected...
Responses of hydrochemical inorganic ions in the rainfall-runoff processes of the experimental catchments and its significance for tracing
W.-Z. Gu, J.-J. Lu, X. Zhao, N.E. Peters
2007, Shuikexue Jinzhan/Advances in Water Science (18) 1-7
Aimed at the rainfall-runoff tracing using inorganic ions, the experimental study is conducted in the Chuzhou Hydrology Laboratory with special designed experimental catchments, lysimeters, etc. The various runoff components including the surface runoff, interflow from the unsaturated zone and the groundwater flow from saturated zone were monitored hydrometrically. Hydrochemical inorganic...
Sediment discharge into a subsiding Louisiana deltaic estuary through a Mississippi River diversion
G.A. Snedden, J.E. Cable, C. Swarzenski, E. Swenson
2007, Estuarine, Coastal and Shelf Science (71) 181-193
Wetlands of the Mississippi River deltaic plain in southeast Louisiana have been hydrologically isolated from the Mississippi River by containment levees for nearly a century. The ensuing lack of fluvial sediment inputs, combined with natural submergence processes, has contributed to high coastal land loss rates. Controlled river diversions have since...
Seed rain, soil seed bank, seed loss and regeneration of Castanopsis fargesii (Fagaceae) in a subtropical evergreen broad-leaved forest
X. Du, Q. Guo, X. Gao, K. Ma
2007, Forest Ecology and Management (238) 212-219
Understanding the seed rain and seed loss dynamics in the natural condition has important significance for revealing the natural regeneration mechanisms. We conducted a 3-year field observation on seed rain, seed loss and natural regeneration of Castanopsis fargesii Franch., a dominant tree species in evergreen broad-leaved forests in Dujiangyan, southwestern...
Short-term aftershock probabilities: Case studies in California
M.C. Gerstenberger, L.M. Jones, S. Wiemer
2007, Seismological Research Letters (78) 66-77
[No abstract available]...
Effect of lipid extraction on analyses of stable carbon and stable nitrogen isotopes in coastal organisms of the Aleutian archipelago
M.A. Ricca, A.K. Miles, R.G. Anthony, X. Deng, S. S. O. Hung
2007, Canadian Journal of Zoology (85) 40-48
We tested whether extracting lipids reduced confounding variation in ??13C and ??15N values by analyzing paired lipid-extracted (LE) and non-lipid-extracted (NLE) samples of bald eagle (Haliaeetus leucocephalus (L., 1766)) whole eggs, muscle tissue from nine seabird and one terrestrial bird species, muscle tissue from four marine fish species, and blue...
Insights into the use of time-lapse GPR data as observations for inverse multiphase flow simulations of DNAPL migration
R.H. Johnson, E. P. Poeter
2007, Journal of Contaminant Hydrology (89) 136-155
Perchloroethylene (PCE) saturations determined from GPR surveys were used as observations for inversion of multiphase flow simulations of a PCE injection experiment (Borden 9??m cell), allowing for the estimation of optimal bulk intrinsic permeability values. The resulting fit statistics and analysis of residuals (observed minus simulated PCE saturations) were used...
Estimating superpopulation size and annual probability of breeding for pond-breeding salamanders
K.E. Kinkead, David L. Otis
2007, Herpetologica (63) 151-162
It has long been accepted that amphibians can skip breeding in any given year, and environmental conditions act as a cue for breeding. In this paper, we quantify temporary emigration or nonbreeding probability for mole and spotted salamanders (Ambystoma talpoideum and A. maculatum). We estimated that 70% of mole salamanders...
Blooms of the toxic dinoflagellate Alexandrium fundyense in the western Gulf of Maine in 1993 and 1994: A comparative modeling study
C.A. Stock, D.J. McGillicuddy Jr., D.M. Anderson, A.R. Solow, R. P. Signell
2007, Continental Shelf Research (27) 2486-2512
Blooms of the toxic dinoflagellate Alexandrium fundyense commonly occur in the western Gulf of Maine but the amount of toxin observed in coastal shellfish is highly variable. In this study, a coupled physical-biological model is used to investigate the dynamics underlying the observed A. fundyense abundance and shellfish toxicity in...
Habitat characteristics of adult frosted elfins (Callophrys irus) in sandplain communities of southeastern Massachusetts, USA
G. Albanese, P.D. Vickery, P.R. Sievert
2007, Biological Conservation (136) 53-64
Changes to land use and disturbance frequency threaten disturbance-dependent Lepidoptera within sandplain habitats of the northeastern United States. The frosted elfin (Callophrys irus) is a rare and declining monophagous butterfly that is found in xeric open habitats maintained by disturbance. We surveyed potential habitat for adult frosted elfins at four...
Establishing a baseline and faunal history in amphibian monitoring programs: The amphibians of Harris Neck, GA
C.K. Dodd Jr., W.J. Barichivich
2007, Southeastern Naturalist (6) 125-134
We conducted an intensive inventory of Harris Neck National Wildlife Refuge in coastal Georgia to determine the feasibility of establishing an amphibian monitoring program at this location. Thirteen semi-aquatic amphibian species were identified at 21 locations. Amphibian species richness at Harris Neck was similar to that of nearby barrier islands....
Reinterpretation of Paleoproterozoic accretionary boundaries of the north-central United States based on a new aeromagnetic-geologic compilation
D.K. Holm, R. Anderson, Terrence Boerboom, W.F. Cannon, V. Chandler, M. Jirsa, J. Miller, D.A. Schneider, K. J. Schulz, W. R. Van Schmus
2007, Precambrian Research (157) 71-79
The Paleoproterozoic crust in the north-central U.S. represents intact juvenile terranes accreted to the rifted Archean Superior craton. A new tectonic province map, based on the interpretation of a new aeromagnetic compilation, published geologic maps, and recent geochronologic data, shows progressive accretion of juvenile arc terranes from ca. 1900-1600 Ma....
An automated approach to detecting signals in electroantennogram data
D. H. Slone, B.T. Sullivan
2007, Journal of Chemical Ecology (33) 1748-1762
Coupled gas chromatography/electroantennographic detection (GC-EAD) is a widely used method for identifying insect olfactory stimulants present in mixtures of volatiles, and it can greatly accelerate the identification of insect semiochemicals. In GC-EAD, voltage changes across an insect's antenna are measured while the antenna is exposed to compounds eluting from a...
Forward model nonlinearity versus inverse model nonlinearity
S. Mehl
2007, Ground Water (45) 791-794
The issue of concern is the impact of forward model nonlinearity on the nonlinearity of the inverse model. The question posed is, "Does increased nonlinearity in the head solution (forward model) always result in increased nonlinearity in the inverse solution (estimation of hydraulic conductivity)?" It is shown that the two...
Oceanography of Glacier Bay, Alaska: Implications for biological patterns in a glacial fjord estuary
L.L. Etherington, P.N. Hooge, Elizabeth Ross Hooge, D.F. Hill
2007, Estuaries and Coasts (30) 927-944
Alaska, U.S.A, is one of the few remaining locations in the world that has fjords that contain temperate idewater glaciers. Studying such estuarine systems provides vital information on how deglaciation affects oceanographic onditions of fjords and surrounding coastal waters. The oceanographic system of Glacier Bay, Alaska, is of particular interest...
Time-independent and time-dependent seismic hazard assessment for the state of California: Uniform California earthquake rupture forecast model 1.0
M.D. Petersen, T. Cao, K.W. Campbell, A.D. Frankel
2007, Seismological Research Letters (78) 99-109
[No abstract available]...
