The influence of disturbance events on survival and dispersal rates of Florida box turtles
C.K. Dodd Jr., A. Ozgul, M.K. Oli
2006, Ecological Applications (16) 1936-1944
Disturbances have the potential to cause long-term effects to ecosystem structure and function, and they may affect individual species in different ways. Long-lived vertebrates such as turtles may be at risk from such events, inasmuch as their life histories preclude rapid recovery should extensive mortality occur. We applied capture–mark–recapture models...
Keystone predators (eastern newts, Notophthalmus viridescens) reduce the impacts of an aquatic invasive species
Kevin G. Smith
2006, Oecologia (148) 342-349
Predation, competition, and their interaction are known to be important factors that influence the structure of ecological communities. In particular, in those cases where a competitive hierarchy exists among prey species, the presence of certain keystone predators can result in enhanced diversity in the prey community. However, little is known...
Persistent disturbance by commercial navigation afters the relative abundance of channel-dwelling fishes in a large river
S. Gutreuter, J.M. Vallazza, B.C. Knights
2006, Canadian Journal of Fisheries and Aquatic Sciences (63) 2418-2433
We provide the first evidence for chronic effects of disturbance by commercial vessels on the spatial distribution and abundance of fishes in the channels of a large river. Most of the world's large rivers are intensively managed to satisfy increasing demands for commercial shipping, but little research has been conducted...
Prediction of broadband ground-motion time histories: Hybrid low/high-frequency method with correlated random source parameters
P. Liu, R.J. Archuleta, S.H. Hartzell
2006, Bulletin of the Seismological Society of America (96) 2118-2130
We present a new method for calculating broadband time histories of ground motion based on a hybrid low-frequency/high-frequency approach with correlated source parameters. Using a finite-difference method we calculate low- frequency synthetics (< ∼1 Hz) in a 3D velocity structure. We also compute broadband synthetics in a 1D velocity model...
Cladophora (Chlorophyta) spp. harbor human bacterial pathogens in nearshore water of Lake Michigan
S. Ishii, T. Yan, D.A. Shively, M.N. Byappanahalli, R.L. Whitman, M.J. Sadowsky
2006, Applied and Environmental Microbiology (72) 4545-4553
Cladophora glomerata, a macrophytic green alga, is commonly found in the Great Lakes, and significant accumulations occur along shorelines during the summer months. Recently, Cladophora has been shown to harbor high densities of the fecal indicator bacteria Escherichia coli and enterococci. Cladophora may also harbor human pathogens; however, until now, no studies to address this question...
Response of oxidative enzyme activities to nitrogen deposition affects soil concentrations of dissolved organic carbon
M. P. Waldrop, D.R. Zak
2006, Ecosystems (9) 921-933
Recent evidence suggests that atmospheric nitrate (NO3- ) deposition can alter soil carbon (C) storage by directly affecting the activity of lignin-degrading soil fungi. In a laboratory experiment, we studied the direct influence of increasing soil NO 3- concentration on microbial C cycling in three different ecosystems: black oak-white oak...
Combined time-series resistivity and geochemical tracer techniques to examine submarine groundwater discharge at Dor Beach, Israel
P.W. Swarzenski, W. C. Burnett, W.J. Greenwood, B. Herut, R. Peterson, N. Dimova, Y. Shalem, Y. Yechieli, Y. Weinstein
2006, Geophysical Research Letters (33)
A high-resolution, stationary geophysical and geochemical survey was conducted at Dor Beach, Israel, to examine the shallow coastal hydrogeology and its control on the exchange of submarine groundwater with the shallow Mediterranean Sea. Time-series resistivity profiles using a new 56 electrode (112-m long) marine cable produced detailed profiles of the...
The chemical quality of self-supplied domestic well water in the United States
Michael J. Focazio, D. Tipton, Stephanie Dunkle Shapiro, Linda H. Geiger
2006, Ground Water Monitoring and Remediation (26) 92-104
Existing water quality data collected from domestic wells were summarized to develop the first national‐scale retrospective of self‐supplied drinking water sources. The contaminants evaluated represent a range of inorganic and organic compounds, and although the data set was not originally designed to be a statistical representation...
Airborne lidar sensing of massive stony coral colonies on patch reefs in the northern Florida reef tract
J. C. Brock, C. W. Wright, I. B. Kuffner, R. Hernandez, P. Thompson
2006, Remote Sensing of Environment (104) 31-42
In this study we examined the ability of the NASA Experimental Advanced Airborne Research Lidar (EAARL) to discriminate cluster zones of massive stony coral colonies on northern Florida reef tract (NFRT) patch reefs based on their topographic complexity (rugosity). Spatially dense EAARL laser submarine topographic soundings acquired in August 2002...
Home range characteristics of great gray owls in Yosemite National Park, California
Charles van Riper III, Jan W. van Wagtendonk
2006, Journal of Raptor Research (40) 130-141
We studied home range and habitat use of radio-tagged Great Gray Owls (Strix nebulosa) in Yosemite, California. From 1986–90 we made 5338 relocations on nine adult and three juvenile owls. Home-range size was not correlated with number of locations and was significantly different between breeding and nonbreeding periods. Breeding female...
Cometary impact and amino acid survival - Chemical kinetics and thermochemistry
D.S. Ross
2006, Journal of Physical Chemistry A (110) 6633-6637
The Arrhenius parameters for the initiating reactions in butane thermolysis and the formation of soot, reliable to at least 3000 K, have been applied to the question of the survival of amino acids in cometary impacts on early Earth. The pressure/temperature/time course employed here was that developed in hydrocode simulations...
Water-clover ferns, Marsilea, in the Southeastern United States
Colette C. Jacono, David M. Johnson
2006, Castanea (71) 1-14
A surge in the collection of exotic Marsilea, M. mutica, M. minuta and M. hirsuta in the southeastern United States has prompted the need for updated identification aids. This study provides an annotated key to all water-clover ferns occurring in the region. It describes and illustrates recently documented exotic species and a previously misidentified western introduction....
Neural network prediction of carbonate lithofacies from well logs, Big Bow and Sand Arroyo Creek fields, Southwest Kansas
L. Qi, T.R. Carr
2006, Computers & Geosciences (32) 947-964
In the Hugoton Embayment of southwestern Kansas, St. Louis Limestone reservoirs have relatively low recovery efficiencies, attributed to the heterogeneous nature of the oolitic deposits. This study establishes quantitative relationships between digital well logs and core description data, and applies these relationships in a probabilistic sense to predict lithofacies in...
Clonal variation in response to salinity and flooding stress in four marsh macrophytes of the northern gulf of Mexico, USA
R.J. Howard, P.S. Rafferty
2006, Environmental and Experimental Botany (56) 301-313
Intraspecific variation in stress tolerance can be an important factor influencing plant population structure in coastal wetland habitats. We studied clones of four species of emergent marsh macrophytes native to the northern coast of the Gulf of Mexico in Louisiana, USA, to examine variation in response to salinity and flooding...
Analysis of a mesoscale infiltration and water seepage test in unsaturated fractured rock: Spatial variabilities and discrete fracture patterns
Q. Zhou, R. Salve, H.-H. Liu, J.S.Y. Wang, D. Hudson
2006, Journal of Contaminant Hydrology (87) 96-122
A mesoscale (21??m in flow distance) infiltration and seepage test was recently conducted in a deep, unsaturated fractured rock system at the crossover point of two underground tunnels. Water was released from a 3??m ?? 4??m infiltration plot on the floor of an alcove in the upper tunnel, and seepage...
Prediction failure of a wolf landscape model
L.D. Mech
2006, Wildlife Society Bulletin (34) 874-877
I compared 101 wolf (Canis lupus) pack territories formed in Wisconsin during 1993-2004 to the logistic regression predictive model of Mladenoff et al. (1995, 1997, 1999). Of these, 60% were located in putative habitat suitabilities <50%, including 22% in suitabilities of 0-9%. About a third of the area with putative...
Sm-Nd isotopic systematics of lherzolitic shergottite Yamato-793605
Keiji Misawa, K. Yamada, N. Nakamura, N. Morikawa, K. Yamashita, W. R. Premo
2006, Antarctic Meteorite Research 45-57
We have undertaken Sm-Nd isotopic studies on Yamato-793605 lherzolitic shergottite. The Sm-Nd internal isochron obtained for acid leachates and residues of whole-rock and separated mineral fractions yields an age of 185 ??16 Ma with an initial ??Nd value of +9.7??0.2. The obtained Sm-Nd age is, within analytical errors, identical to...
Multiple edifice-collapse events in the Eastern Mexican Volcanic Belt: The role of sloping substrate and implications for hazard assessment
Gerardo Carrasco-Nunez, Rodolfo Diaz-Castellon, Lee Siebert, B. Hubbard, M.F. Sheridan, Sergio R. Rodriguez
2006, Journal of Volcanology and Geothermal Research (158) 151-176
The Citlalte??petl-Cofre de Perote volcanic chain forms an important physiographic barrier that separates the Central Altiplano (2500??masl) from the Gulf Coastal Plain (GCP) (1300??masl). The abrupt eastward drop in relief between these provinces gives rise to unstable conditions and consequent gravitational collapse of large volcanic edifices built at the edge...
Integration of P- and SH-wave high-resolution seismic reflection and micro-gravity techniques to improve interpretation of shallow subsurface structure: New Madrid seismic zone
C.E. Bexfield, J.H. McBride, Andre J. M. Pugin, D. Ravat, S. Biswas, W.J. Nelson, T.H. Larson, S.L. Sargent, M.A. Fillerup, B.E. Tingey, L. Wald, M.L. Northcott, J.V. South, M.S. Okure, M.R. Chandler
2006, Tectonophysics (420) 5-21
Shallow high-resolution seismic reflection surveys have traditionally been restricted to either compressional (P) or horizontally polarized shear (SH) waves in order to produce 2-D images of subsurface structure. The northernmost Mississippi embayment and coincident New Madrid seismic zone (NMSZ) provide an ideal laboratory to study the experimental use of integrating...
A method for landscape analysis of forestry guidelines using bird habitat models and the Habplan harvest scheduler
C. Loehle, P. Van Deusen, T.B. Wigley, M.S. Mitchell, S.H. Rutzmoser, J. Aggett, J.A. Beebe, M.L. Smith
2006, Forest Ecology and Management (232) 56-67
Wildlife-habitat relationship models have sometimes been linked with forest simulators to aid in evaluating outcomes of forest management alternatives. However, linking wildlife-habitat models with harvest scheduling software would provide a more direct method for assessing economic and ecological implications of alternative harvest schedules in commercial forest operations. We demonstrate an...
Biomarkers of exposure and effects of environmental contaminants on swallows nesting along the Rio Grande, Texas, USA
M.A. Mora, D. Musquiz, J. W. Bickham, D.S. MacKenzie, M.J. Hooper, J.K. Szabo, C. W. Matson
2006, Environmental Toxicology and Chemistry (25) 1574-1584
We collected adult cave swallows (Petrochelidon fulva) and cliff swallows (P. pyrrhonota) during the breeding seasons in 1999 and 2000 from eight locations along the Rio Grande from Brownsville to El Paso (unless otherwise specified, all locations are Texas, USA) and an out-of-basin reference location. Body mass, spleen mass, hepatosomatic...
Fast simulated annealing inversion of surface waves on pavement using phase-velocity spectra
N. Ryden, C.B. Park
2006, Geophysics (71)
The conventional inversion of surface waves depends on modal identification of measured dispersion curves, which can be ambiguous. It is possible to avoid mode-number identification and extraction by inverting the complete phase-velocity spectrum obtained from a multichannel record. We use the fast simulated annealing (FSA) global search algorithm to minimize...
Should heterogeneity be the basis for conservation? Grassland bird response to fire and grazing
S.D. Fuhlendorf, W.C. Harrell, David M. Engle, R.G. Hamilton, C.A. Davis, David M. Leslie Jr.
2006, Ecological Applications (16) 1706-1716
In tallgrass prairie, disturbances such as grazing and fire can generate patchiness across the landscape, contributing to a shifting mosaic that presumably enhances biodiversity. Grassland birds evolved within the context of this shifting mosaic, with some species restricted to one or two patch types created under spatially and temporally distinct...
Proposed stratotype for the base of the highest Cambrian stage at the first appearance datum of Cordylodus andresi, Lawson Cove section, Utah, USA
J.F. Miller, Raymond L. Ethington, K.R. Evans, L.E. Holmer, James D. Loch, L.E. Popov, J.E. Repetski, R.L. Ripperdan, John F. Taylor
2006, Palaeoworld (15) 384-405
We propose a candidate for the Global Standard Stratotype-section and Point (GSSP) for the base of the highest stage of the Furongian Series of the Cambrian System. The section is at Lawson Cove in the Ibex area of Millard County, Utah, USA. The marker horizon is the first appearance datum...
Methods in polarized light microscopy: An overview and historical perspective
D. E. Kile
2006, Conference Paper, Microscopy and Microanalysis
[No abstract available]...
