The study of ozone variations in the Las Vegas metropolitan area using remote sensing information and ground observations
G. Xian, M. Crane
2006, Conference Paper, 86th AMS Annual Meeting
Urban development in the Las Vegas Valley, Nevada, has grown rapidly in the past fifty years. Associated with this growth has been a change in landscape from natural cover types to developed urban land mixed with planned vegetation canopy throughout in the metropolitan area. Air quality in the Las Vegas...
High-resolution stratigraphy of a Mississippi subdelta-lobe progradation in the Barataria Bight, north-central Gulf of Mexico
J. G. Flocks, N.F. Ferina, C. Dreher, J. L. Kindinger, D. M. FitzGerald, M.A. Kulp
2006, Journal of Sedimentary Research (76) 429-443
The coastal zone of southeastern Louisiana is the product of numerous cycles of progradation, abandonment, and marine transgression of the Mississippi River delta. Currently, the shoreline in the Barataria Bight is undergoing significant erosion and retreat, and understanding its evolution is crucial in stabilization efforts. This study uses an extensive...
Drowned coralline algal dominated deposits off Lanai, Hawaii; carbonate accretion and vertical tectonics over the last 30 ka
Jody M. Webster, David A. Clague, Juan Carlos Braga, Heather Spalding, Willem Renema, Christopher Kelley, Bruce Applegate, John R. Smith, Charles K. Paull, James G. Moore, Donald Potts
2006, Marine Geology (225) 223-246
We present detailed bathymetry, remotely operated vehicle (ROV) and submersible observations, and sedimentary and radiocarbon age data from carbonate deposits recovered from two submerged terraces at − 150 m (T1) and − 230 m (T2) off Lanai, Hawaii. The tops of the terraces are veneered by relatively thin (<5 m) in situ...
Response of fishes to floodplain connectivity during and following a 500-year flood event in the unimpounded upper Mississippi River
V.A. Barko, D.P. Herzog, M. T. O’Connell
2006, Wetlands (26) 244-257
We examined data collected on fish assemblage structure among three differing floodplain types (broad, moderate, and narrow) during the 1993 flood in the unimpounded reach of the upper Mississippi River. This 500 year flood event provided a unique opportunity to investigate fish-floodplain function because the main river channel is otherwise...
Using a binaural biomimetic array to identify bottom objects ensonified by echolocating dolphins
D.A. Heiweg, P.W. Moore, S.W. Martin, L.A. Dankiewicz
2006, Bioinspiration and Biomimetics (1) 41-51
The development of a unique dolphin biomimetic sonar produced data that were used to study signal processing methods for object identification. Echoes from four metallic objects proud on the bottom, and a substrate-only condition, were generated by bottlenose dolphins trained to ensonify the targets in very shallow water. Using the...
Probabilistic analysis of tsunami hazards
E.L. Geist, T. Parsons
2006, Natural Hazards (37) 277-314
Determining the likelihood of a disaster is a key component of any comprehensive hazard assessment. This is particularly true for tsunamis, even though most tsunami hazard assessments have in the past relied on scenario or deterministic type models. We discuss probabilistic tsunami hazard analysis (PTHA) from the standpoint of integrating...
Recruitment of Hexagenia mayfly nymphs in western Lake Erie linked to environmental variability
Thomas B. Bridgeman, Don W. Schloesser, Ann E. Krause
2006, Ecological Applications (16) 601-611
After a 40-year absence caused by pollution and eutrophication, burrowing mayflies (Hexagenia spp.) recolonized western Lake Erie in the mid 1990s as water quality improved. Mayflies are an important food resource for the economically valuable yellow perch fishery and are considered to be major indicator species of the ecological condition...
Estimates of in situ gas hydrate concentration from resistivity monitoring of gas hydrate bearing sediments during temperature equilibration
M. Riedel, P.E. Long, T. S. Collett
2006, Marine Geology (227) 215-225
As part of Ocean Drilling Program Leg 204 at southern Hydrate Ridge off Oregon we have monitored changes in sediment electrical resistivity during controlled gas hydrate dissociation experiments. Two cores were used, each filled with gas hydrate bearing sediments (predominantly mud/silty mud). One core was from Site 1249 (1249F-9H3), 42.1...
Effects of radiomarking on prairie falcons: Attachment failures provide insights about survival
Karen Steenhof, Kirk K. Bates, Mark R. Fuller, Michael N. Kochert, James O. McKinley, Paul M. Lukacs
2006, Wildlife Society Bulletin (34) 116-126
From 1999–2002, we attached satellite-received platform transmitter terminals (PTTs) to 40 adult female prairie falcons (Falco mexicanus) on their nesting grounds in the Snake River Birds of Prey National Conservation Area (NCA) in southwest Idaho. We used 3 variations of a backpack harness design that had been used previously on...
The chlorinated AHR ligand 3,3′,4,4′,5-pentachlorobiphenyl (PCB126) promotes reactive oxygen species (ROS) production during embryonic development in the killifish (Fundulus heteroclitus)
Xabier Arzuaga, Deena Wassenberg, Richard D. Giulio, Adria Elskus
2006, Aquatic Toxicology (76) 13-23
Exposure to dioxin-like chemicals that activate the aryl hydrocarbon receptor (AHR) can result in increased cellular and tissue production of reactive oxygen species (ROS). Little is known of these effects during early fish development. We used the fish model, Fundulus heteroclitus, to determine if the AHR ligand and pro-oxidant 3,3′,4,4′,5-pentachlorobiphenyl (PCB126)...
Iron isotope fractionation during microbially stimulated Fe(II) oxidation and Fe(III) precipitation
N. Balci, T.D. Bullen, K. Witte-Lien, Wayne C. Shanks, M. Motelica, K.W. Mandernack
2006, Geochimica et Cosmochimica Acta (70) 622-639
Interpretation of the origins of iron-bearing minerals preserved in modern and ancient rocks based on measured iron isotope ratios depends on our ability to distinguish between biological and non-biological iron isotope fractionation processes. In this study, we compared 56Fe/54Fe ratios of coexisting aqueous iron (Fe(II)aq, Fe(III)aq) and iron oxyhydroxide precipitates...
The quest for the perfect gravity anomaly: Part 1 - New calculation standards
X. Li, T.G. Hildenbrand, W. J. Hinze, Gordon R. Keller, D. Ravat, M. Webring
2006, SEG Technical Program Expanded Abstracts (25) 859-863
The North American gravity database together with databases from Canada, Mexico, and the United States are being revised to improve their coverage, versatility, and accuracy. An important part of this effort is revision of procedures and standards for calculating gravity anomalies taking into account our enhanced computational power, modern satellite-based...
Evaluating light-based geolocation for estimating demersal fish movements in high latitudes
Andrew C. Seitz, Brenda L. Norcross, Derek Wilson, Jennifer L. Nielsen
2006, Fishery Bulletin (104) 571-578
We evaluated light-based geolocation estimates from pop-up satellite tags in high latitudes because some of the largest fisheries in the world are in areas where this technique has not been assessed. Daily longitude and latitude were estimated by using two Wildlife Computers software programs: 1) Argos Message Processor (AMP), which...
Temporal evolution of carbon budgets of the Appalachian forests in the U.S. from 1972 to 2000
J. Liu, S. Liu, Thomas R. Loveland
2006, Forest Ecology and Management (222) 191-201
Estimating dynamic terrestrial ecosystem carbon (C) sources and sinks over large areas is difficult. The scaling of C sources and sinks from the field level to the regional level has been challenging due to the variations of climate, soil, vegetation, and disturbances. As part of an effort to estimate the...
Demographic patterns of postfire regeneration in Mediterranean-climate shrublands of California
Jon E. Keeley, C. J. Fotheringham, M. Baer-Keeley
2006, Ecological Monographs (76) 235-255
This study uses detailed demographic data to determine the extent to which functional groupings, based on seedling recruitment and resprouting response to fire, capture the dynamics of postfire responses and early successional change in fire-prone ecosystems. Following massive wildfires in southern California, USA, we sampled chaparral and sage scrub vegetation...
Proximate and landscape factors influence grassland bird distributions
M.A. Cunningham, Douglas H. Johnson
2006, Ecological Applications (16) 1062-1075
Ecologists increasingly recognize that birds can respond to features well beyond their normal areas of activity, but little is known about the relative importance of landscapes and proximate factors or about the scales of landscapes that influence bird distributions. We examined the influences of tree cover at both proximate and...
A community effort to construct a gravity database for the United States and an associated Web portal
Gordon R. Keller, T.G. Hildenbrand, R. Kucks, M. Webring, A. Briesacher, K. Rujawitz, A.M. Hittleman, D.R. Roman, D. Winester, R. Aldouri, J. Seeley, J. Rasillo, R. Torres, W. J. Hinze, A. Gates, V. Kreinovich, L. Salayandia
2006, Special Paper of the Geological Society of America 21-34
Potential field data (gravity and magnetic measurements) are both useful and costeffective tools for many geologic investigations. Significant amounts of these data are traditionally in the public domain. A new magnetic database for North America was released in 2002, and as a result, a cooperative effort between government agencies, industry,...
Albatross species demonstrate regional differences in North Pacific marine contamination
M. Finkelstein, B.S. Keitt, D.A. Croll, B. Tershy, Walter M. Jarman, S. Rodriguez-Pastor, D.J. Anderson, P.R. Sievert, D. R. Smith
2006, Ecological Applications (16) 678-686
Recent concern about negative effects on human health from elevated organochlorine and mercury concentrations in marine foods has highlighted the need to understand temporal and spatial patterns of marine pollution. Seabirds, long-lived pelagic predators with wide foraging ranges, can be used as indicators of regional contaminant patterns across large temporal...
Lake Sturgeon, Acipenser fulvescens, movements in Rainy Lake, Minnesota and Ontario
W.E. Adams Jr., L.W. Kallemeyn, D.W. Willis
2006, Canadian Field-Naturalist (120) 71-82
Rainy Lake, Minnesota-Ontario, contains a native population of Lake Sturgeon (Acipenser fulvescens) that has gone largely unstudied. The objective of this descriptive study was to summarize generalized Lake Sturgeon movement patterns through the use of biotelemetry. Telemetry data reinforced the high utilization of the Squirrel Falls geographic location by Lake...
Habitat preferences and intraspecific competition in black-footed ferrets
Dean E. Biggins, Jerry L. Godbey, Marc R. Matchett, Travis M. Livieri
2006, Conference Paper, Recovery of the black-footed ferret: Progress and continuing challenges- Proceedings of the Symposium on the Status of the Black-footed Ferret and Its Habitat, Fort Collins, Colorado, January 28-29, 2004 (Scientific Investigations Report 2005-5293)
We used radio-telemetry data (28,560 positional fixes) collected on 153 black-footed ferrets (Mustela nigripes) to (1) reexamine the assumed obligate relationship of these ferrets to prairie dogs (Cynomys spp.), (2) investigate habitat preferences of ferrets at a small scale (1 year (P = 0.048). Also, preference was stronger for wild-born...
Geophysical evaluation of the Success Dam foundation, Porterville, California
L. E. Hunter, M.H. Powers, S. Haines, T. Asch, B.L. Burton, D.C. Serafini
2006, Conference Paper, Association of State Dam Safety Officials - Dam Safety 2006, Proceedings from the 2006 Annual Conference
Success Dam is a zonedearth fill embankment located near Porterville, CA. Studies of Success Dam by the recent Dam Safety Assurance Program (DSAP) have demonstrated the potential for seismic instability and large deformation of the dam due to relatively low levels of earthquake shaking. The U.S. Army Corps of Engineers...
The composite method: An improved method for stream-water solute load estimation
Brent T. Aulenbach, R. P. Hooper
2006, Hydrological Processes (20) 3029-3047
The composite method is an alternative method for estimating stream-water solute loads, combining aspects of two commonly used methods: the regression-model method (which is used by the composite method to predict variations in concentrations between collected samples) and a period-weighted approach (which is used by the composite method to apply...
Numerical modeling of magnetic moments for UXO applications
V. Sanchez, Y. Li, M. Nabighian, D. Wright
2006, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
The surface magnetic anomaly observed in UXO clearance is mainly dipolar and, consequently, the dipole is the only magnetic moment regularly recovered in UXO applications. The dipole moment contains information about intensity of magnetization but lacks information about shape. In contrast, higher-order moments, such as quadrupole and octupole, encode asymmetry...
Remote monitoring of fish in small streams: A unified approach using PIT tags
G.B. Zydlewski, G. Horton, T. Dubreuil, B. Letcher, S. Casey, Joseph D. Zydlewski
2006, Fisheries (31) 492-502
Accurate assessments of fish populations are often limited by re-observation or recapture events. Since the early 1990s, passive integrated transponders (PIT tags) have been used to understand the biology of many fish species. Until recently, PIT applications in small streams have been limited to physical recapture events. To maximize recapture...
Modeling regional initiation of rainfall-induced shallow landslides in the eastern Umbria Region of central Italy
D. Salciarini, J. W. Godt, W. Z. Savage, P. Conversini, R.L. Baum, J. A. Michael
2006, Landslides (3) 181-194
We model the rainfall-induced initiation of shallow landslides over a broad region using a deterministic approach, the Transient Rainfall Infiltration and Grid-based Slope-stability (TRIGRS) model that couples an infinite-slope stability analysis with a one-dimensional analytical solution for transient pore pressure response to rainfall infiltration. This model permits the evaluation of...
