Predation by Oregon spotted frogs (Rana pretiosa) on Western toads (Bufo boreas) in Oregon, USA
Christopher A. Pearl, M.P. Hayes
2002, American Midland Naturalist (147) 145-152
Toads of the genus Bufo co-occur with true frogs (family Ranidae) throughout their North American ranges. Yet, Bufo are rarely reported as prey for ranid frogs, perhaps due to dermal toxins that afford them protection from some predators. We report field observations from four different localities demonstrating that Oregon spotted...
Rangeland health attributes and indicators for qualitative assessment
David A. Pyke, Jeffrey E. Herrick, Patrick Shaver, Mike Pellant
2002, Journal of Range Management (55) 584-597
Panels of experts from the Society for Range Management and the National Research Council proposed that status of rangeland ecosystems could be ascertained by evaluating an ecological site's potential to conserve soil resources and by a series of indicators for ecosystem processes and site stability. Using these recommendations as a...
American white pelican soaring flight times and altitudes relative to changes in thermal depth and intensity
H.D. Shannon, G.S. Young, M. Yates, Mark R. Fuller, W. Seegar
2002, The Condor (104) 679-683
We compared American White Pelican (Pelecanus erythrorhynchos) soaring flight times and altitudes to model-produced estimates of thermal depth and intensity. These data showed that pelican soaring flight was confined to the thermal layer, and that the vertical extent of the soaring flight envelope increased with increases in thermal depth. Pelicans...
Trends in midwinter counts of bald eagles in the contiguous United States, 1986-2000
Karen Steenhof, Laura Bond, Kirk K. Bates, Lynda L. Leppert
2002, Bird Populations (6) 21-32
We estimated statewide, regional, and national trends in counts of Bald Eagles (Haliaeetus leucocephalus) along selected routes in the contiguous United States during midwinter, 1986-2000. Each January, several hundred observers collected data as part of a survey initiated by the National Wildlife Federation in 1979. To analyze these data, we...
Archiving, processing, and disseminating ASTER products at the USGS EROS Data Center
Brenda Jones, Brian L. Tolk
Barnes W.L., editor(s)
2002, Conference Paper
The U.S. Geological Survey EROS Data Center archives, processes, and disseminates Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) data products. The ASTER instrument is one of five sensors onboard the Earth Observing System's Terra satellite launched December 18, 1999. ASTER collects broad spectral coverage with high spatial resolution at...
Preliminary cellular-automata forecast of permit activity from 1998 to 2010, Idaho and Western Montana
G. L. Raines, M. L. Zientek, J. D. Causey, D. E. Boleneus
2002, Natural Resources Research (11) 167-180
For public land management in Idaho and western Montana, the U.S. Forest Service (USFS) has requested that the U.S. Geological Survey (USGS) predict where mineral-related activity will occur in the next decade. Cellular automata provide an approach to simulation of this human activity. Cellular automata (CA) are defined by an...
A bilinear source-scaling model for M-log a observations of continental earthquakes
Thomas C. Hanks, W. H. Bakun
2002, Bulletin of the Seismological Society of America (92) 1841-1846
The Wells and Coppersmith (1994) M-log A data set for continental earthquakes (where M is moment magnitude and A is fault area) and the regression lines derived from it are widely used in seismic hazard analysis for estimating M, given A. Their relations are well determined, whether for the full...
USGS leads United States effort in Mallik Well
2002, Fire in the Ice: NETL Methane Hydrate Newsletter (2) 3-4
This winter, in the extremely cold, far reaches of the upper Northwest Territory of Canada, there is an international consortium of researchers participating in a program to study methane hydrates. The researchers are currently drilling a 1200 m-deep production research well through the permafrost. It is one of three wells...
Comment [on 'Are Proterozoic cap carbonates and isotopic excursions a record of gas hydrate destabilization following Earth’s coldest intervals?, Kennedy et al., Geology 29(5), 442-446]
M.D. Max, William P. Dillon
2002, Geology (30) 762-763
We welcome the evidence noted by Kennedy et al. (2001) for strong methane excursions associated with the cessation of glacial episodes. They identify the carbon in cap carbonates overlying glacial sediments as probably being of biogenic origin and as likely having had a biogenic methane source. These authors suggest that...
Potential responses of riparian vegetation to dam removal
P.B. Shafroth, Jonathan M. Friedman, G.T. Auble, M. L. Scott, J.H. Braatne
2002, BioScience (52) 703-712
Throughout the world, riparian habitats have been dramatically modified from their natural condition. Dams are one of the principal causes of these changes, because of their alteration of water and sediment regimes (Nilsson and Berggren 2000). Because of the array of ecological goods and services...
Differences in attenuation among the stable continental regions
W. H. Bakun, Art McGarr
2002, Geophysical Research Letters (29) 36-1-36-4
There are systematic differences in the attenuation of damaging earthquake ground motions between different stable continental regions (SCRs). Seismic intensity and weak-motion data show that the attenuation in seismic waves for eastern North America (ENA) is less than for India, Africa, Australia, and northwest Europe. If ENA ground-motion attenuation relations...
Mapping apparent stress and energy radiation over fault zones of major earthquakes
Art McGarr, Joe B. Fletcher
2002, Bulletin of the Seismological Society of America (92) 1633-1646
Using published slip models for five major earthquakes, 1979 Imperial Valley, 1989 Loma Prieta, 1992 Landers, 1994 Northridge, and 1995 Kobe, we produce maps of apparent stress and radiated seismic energy over their fault surfaces. The slip models, obtained by inverting seismic and geodetic data, entail the division of the...
Otters
James A. Estes, James L. Bodkin
William F. Perrin, Bernd Wursing, J.G.M. Thewissen, editor(s)
2002, Book chapter, Encyclopedia of marine mammals
The otters (Mustelidae; Lutrinae) provide a unique look into the evolution of marine living by mammals. This is because most extant marine mammals have been so highly modified by long periods of selection for life in the sea that they bare little resemblance to their terrestrial ancestors. Marine otters, by...
The use of models for a multiscaled ecological monitoring system: Chapter 6
Donald L. DeAngelis, L.J. Gross, E.J. Comiskey, Wolf M. Mooij, M.P. Nott
David E. Busch, Joel C. Trexler, editor(s)
2002, Book chapter, Monitoring ecosystems: Interdisciplinary approaches for evaluating ecoregional initiatives
No abstract available...
Control of strong ground motion of mining-induced earthquakes by the strength of the seismogenic rock mass
Art McGarr
2002, Journal of the South African Institute of Mining and Metallurgy (102) 225-229
The shear stress ?? that can be sustained by the rock mass in the environs of a mining-induced earthquake controls the near-fault peak ground velocity v of that event according to v???0.25(??/G) ??, where ?? is the shear wave speed and G is the modulus of rigidity. To estimate ??...
Strike-slip earthquakes in the oceanic lithosphere: Observations of exceptionally high apparent stress
George Choy, Art McGarr
2002, Geophysical Journal International (150) 506-523
The radiated energies, ES, and seismic moments, M0, for 942 globally distributed earthquakes that occurred between 1987 to 1998 are examined to find the earthquakes with the highest apparent stresses (τa=μES/M0, where μ is the modulus of rigidity). The globally averaged τa for shallow earthquakes in all tectonic environments and seismic regions is...
Operating the EOSDIS at the land processes DAAC managing expectations, requirements, and performance across agencies, missions, instruments, systems, and user communities
T. A. Kalvelage
Barnes W.L., editor(s)
2002, Conference Paper
NASA developed the Earth Observing System (EOS) during the 1990'S. At the Land Processes Distributed Active Archive Center (LP DAAC), located at the USGS EROS Data Center, the EOS Data and Information System (EOSDIS) is required to support heritage missions as well as Landsat 7, Terra, and Aqua. The original...
Spatial scale analysis in geophysics - Integrating surface and borehole geophysics in groundwater studies
Frederick L. Paillet
V.H. Singhroy, D.T. Hansen, R.R. Pierce, A.I. Johnson, editor(s)
2002, Conference Paper, ASTM Special Technical Publication
Integration of geophysical data obtained at various scales can bridge the gap between localized data from boreholes and site-wide data from regional survey profiles. Specific approaches to such analysis include: 1) comparing geophysical measurements in boreholes with the same measurement made from the surface; 2) regressing geophysical data obtained in...
Modeling ecosystem and population dynamics on the South Florida hydroscape
D.L. DeAngelis, S. Bellmund, W.M. Mooij, M.P. Nott, E.J. Comiskey, L.J. Gross, W.M. Wolff
J.W. Porter, K.G. Porter, editor(s)
2002, Book chapter, Everglades, Florida Bay and Coral Reefs of the Florida Keys: An Ecosystem Sourcebook
Abstract not supplied at this time...
Worldwide estimates of deep natural gas resources based on the U.S. Geological Survey World Petroleum Assessment 2000
T. S. Dyman, R. A. Crovelli, C. E. Bartberger, K. I. Takahashi
2002, Natural Resources Research (11) 207-218
The U.S. Geological Survey recently assessed undiscovered conventional gas and oil resources in eight regions of the world outside the U.S. The resources assessed were those estimated to have the potential to be added to reserves within the next thirty years. This study is a worldwide analysis of the estimated...
Community food webs
Donald L. DeAngelis
Abdel H. El-Shaarawi, Walter W. Piegorsch, editor(s)
2002, Book chapter, Encyclopedia of Environmetrics
Community food webs describe the feeding relationships, or trophic interactions, between the species of an ecological community. Both the structure and dynamics of such webs are the focus of food web research. The topological structures of empirical food webs from many ecosystems have been published on the basis of field...
Absolute irradiance of the Moon for on-orbit calibration
T.C. Stone, H. H. Kieffer
Barnes W.L., editor(s)
2002, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
The recognized need for on-orbit calibration of remote sensing imaging instruments drives the ROLO project effort to characterize the Moon for use as an absolute radiance source. For over 5 years the ground-based ROLO telescopes have acquired spatially-resolved lunar images in 23 VNIR (Moon diameter ???500 pixels) and 9 SWIR...
The 12 September 1999 Upper East Rift Zone dike intrusion at Kilauea Volcano, Hawaii
Peter Cervelli, P. Segall, F. Amelung, H. Garbeil, C. Meertens, S. Owen, Asta Mikijus, M. Lisowski
2002, Journal of Geophysical Research B: Solid Earth (107) ECV 3-1-ECV 3-13
Deformation associated with an earthquake swarm on 12 September 1999 in the Upper East Rift Zone of Kilauea Volcano was recorded by continuous GPS receivers and by borehole tiltmeters. Analyses of campaign GPS, leveling data, and interferometric synthetic aperture radar (InSAR) data from the ERS-2 satellite also reveal significant deformation...
Tidal Flux Variation in the Lower Pearl River and Lake Pontchartrain Estuaries of Mississippi and Louisiana
D.P. Turnipseed
Wahl T.L.Pugh C.A.Oberg K.A.Vermeyen T.B.Wahl T.L.Pugh C.A.Oberg K.A.Vermeyen T.B., editor(s)
2002, Conference Paper, Hydraulic Measurements and Experimental Methods
Three tidal gages were constructed to collect hydraulic and water-quality properties that could be used to compute the tidal flux of the Pearl River and Lake Pontchartrain estuarine systems in Mississippi and Louisiana. The gages record continuous tidal stage, velocity, water temperature, specific conductance, and salinity, and transmit these data...
A preliminary evaluation of near-transducer velocities collected with low-blank acoustic Doppler current profiler
J. W. Gartner, N. K. Ganju
T. L. Wahl, C. A. Pugh, Kevin Oberg, T. B. Vermeyen, editor(s)
2002, Conference Paper
Many streams and rivers for which the US Geological Survey must provide discharge measurements are too shallow to apply existing acoustic Doppler current profiler techniques for flow measurements of satisfactory quality. Because the same transducer is used for both transmitting and receiving acoustic signals in most Doppler current profilers, some...
