Movements of walruses radio-tagged in Bristol Bay, Alaska
Chadwick V. Jay, Susan Hills
2005, Arctic (58) 192-202
Satellite radio-location data from 57 adult male Pacific walruses (Odobenus rosmarus divergens) were used to estimate haul-out fidelity, broadly describe seasonal foraging distributions, and determine the approximate timing of autumn migration from Bristol Bay, Alaska. Data were collected intermittently during 1987–91 and 1995–2000, primarily during the period from May to...
On pads and filters: Processing strong-motion data
D.M. Boore
2005, Bulletin of the Seismological Society of America (95) 745-750
Processing of strong-motion data in many cases can be as straightforward as filtering the acceleration time series and integrating to obtain velocity and displacement. To avoid the introduction of spurious low-frequency noise in quantities derived from the filtered accelerations, however, care must be taken to append zero pads of adequate...
Evidence for a global seismic-moment release sequence
C. G. Bufe, D. M. Perkins
2005, Bulletin of the Seismological Society of America (95) 833-843
Temporal clustering of the larger earthquakes (foreshock-mainshock-aftershock) followed by relative quiescence (stress shadow) are characteristic of seismic cycles along plate boundaries. A global seismic-moment release history, based on a little more than 100 years of instrumental earthquake data in an extended version of the catalog of Pacheco and Sykes (1992),...
Multilevel assessment of fish species traits to evaluate habitat degradation in streams of the upper midwest
R. M. Goldstein, M. R. Meador
2005, North American Journal of Fisheries Management (25) 180-194
We used species traits to examine the variation in fish assemblages for 21 streams in the Northern Lakes and Forests Ecoregion along a gradient of habitat disturbance. Fish species were classified based on five species trait-classes (trophic ecology, substrate preference, geomorphic preference, locomotion morphology, and reproductive strategy) and 29 categories...
Mapping the invasive species, Chinese tallow, with EO1 satellite Hyperion hyperspectral image data and relating tallow occurrences to a classified Landsat Thematic Mapper land cover map
Elijah W. Ramsey III, A. Rangoonwala, G. Nelson, R. Ehrlich
2005, International Journal of Remote Sensing (26) 1637-1657
Our objective was to provide a realistic and accurate representation of the spatial distribution of Chinese tallow (Triadica sebifera) in the Earth Observing 1 (EO1) Hyperion hyperspectral image coverage by using methods designed and tested in previous studies. We transformed, corrected, and normalized Hyperion reflectance image data into composition images...
Discovery sequence and the nature of low permeability gas accumulations
E. D. Attanasi
2005, Natural Resources Research (14) 129-135
There is an ongoing discussion regarding the geologic nature of accumulations that host gas in low-permeability sandstone environments. This note examines the discovery sequence of the accumulations in low permeability sandstone plays that were classified as continuous-type by the U.S. Geological Survey for the 1995 National Oil and Gas Assessment....
Home range and habitat use by Great Horned Owls (Bubo virginianus) in Southern California
J.R. Bennett, P.H. Bloom
2005, Journal of Raptor Research (39) 119-126
Great Horned Owls (Bubo virginianus) are a common, widespread species that can be found in a variety of habitats across most of North America, but little is known about their space and habitat requirements. Using radiotelemetry, location data were collected on nine male and five female Great Horned Owls to...
Basal tissue structure in the earliest euconodonts: Testing hypotheses of developmental plasticity in euconodont phylogeny
X.-P. Dong, P.C.J. Donoghue, J.E. Repetski
2005, Palaeontology (48) 411-421
The hypothesis that conodonts are vertebrates rests solely on evidence of soft tissue anatomy. This has been corroborated by microstructural, topological and developmental evidence of homology between conodont and vertebrate hard tissues. However, these conclusions have been reached on the basis of evidence from highly derived euconodont taxa and the...
The accuracy of matrix population model projections for coniferous trees in the Sierra Nevada, California
P. J. van Mantgem, N.L. Stephenson
2005, Journal of Ecology (93) 737-747
1 We assess the use of simple, size-based matrix population models for projecting population trends for six coniferous tree species in the Sierra Nevada, California. We used demographic data from 16 673 trees in 15 permanent plots to create 17 separate time-invariant, density-independent population projection models, and determined differences between...
An alternative approach to characterize nonlinear site effects
R.R. Zhang, S. Hartzell, J. Liang, Y. Hu
2005, Earthquake Spectra (21) 243-274
This paper examines the rationale of a method of nonstationary processing and analysis, referred to as the Hilbert-Huang transform (HHT), for its application to a recording-based approach in quantifying influences of soil nonlinearity in site response. In particular, this paper first summarizes symptoms of soil nonlinearity shown in earthquake recordings,...
Acute toxicity of six freshwater mussel species (Glochidia) to six chemicals: Implications for daphnids and Utterbackia imbecillis as surrogates for protection of freshwater mussels (Unionidae)
C.D. Milam, J.L. Farris, F.J. Dwyer, D.K. Hardesty
2005, Archives of Environmental Contamination and Toxicology (48) 166-173
Acute (24-h) toxicity tests were used in this study to compare lethality responses in early life stages (glochidia) of six freshwater mussel species, Leptodea fragilis, U. imbecillis, Lampsilis cardium, Lampsilis siliquoidea, Megalonaias nervosa, and Ligumia subrostrata, and two standard test organisms, Ceriodaphnia dubia and Daphnia magna. Concentrations of carbaryl, copper,...
Observations of plan-view sand ripple behavior and spectral wave climate on the inner shelf of San Pedro Bay, California
J. P. Xu
2005, Continental Shelf Research (25) 373-396
Concurrent video images of sand ripples and current meter measurements of directional wave spectra are analyzed to study the relations between waves and wave-generated sand ripples. The data were collected on the inner shelf off Huntington Beach, California, at 15 m water depth, where the sea floor is comprised of...
Influence of sediment storage on downstream delivery of contaminated sediment
Daniel V. Malmon, Steven L. Reneau, Thomas Dunne, Danny Katzman, Paul G. Drakos
2005, Water Resources Research (41)
Sediment storage in alluvial valleys can strongly modulate the downstream migration of sediment and associated contaminants through landscapes. Traditional methods for routing contaminated sediment through valleys focus on in‐channel sediment transport but ignore the influence of sediment exchanges with temporary sediment storage reservoirs outside the channel, such as floodplains. In...
Acquisition and evaluation of thermodynamic data for bieberite-moorhouseite equilibria at 0.1 MPa
I.-M. Chou, R.R. Seal II
2005, American Mineralogist (90) 912-917
Published estimates for the equilibrium relative humidity (RH) at 25 deg;C for the reaction: bieberite (CoSO4??7H2O) = moorhouseite (CoSO4??6H2O) + H2O, range from 69.8 to 74.5%. To evaluate these data, the humidity-buffer technique was used to determine equilibrium constants for this reaction between 14 and 43 ??C at 0.1 MPa....
High dispersal in a frog species suggests that it is vulnerable to habitat fragmentation
W.C. Funk, A.E. Greene, P.S. Corn, F.W. Allendorf
2005, Biology Letters (1) 13-16
Global losses of amphibian populations are a major conservation concern and their causes have generated substantial debate. Habitat fragmentation is considered one important cause of amphibian decline. However, if fragmentation is to be invoked as a mechanism of amphibian decline, it must first be established that dispersal is prevalent among...
Characterizing the spatial structure of endangered species habitat using geostatistical analysis of IKONOS imagery
C.S.A. Wallace, S.E. Marsh
2005, International Journal of Remote Sensing (26) 2607-2629
Our study used geostatistics to extract measures that characterize the spatial structure of vegetated landscapes from satellite imagery for mapping endangered Sonoran pronghorn habitat. Fine spatial resolution IKONOS data provided information at the scale of individual trees or shrubs that permitted analysis of vegetation structure and pattern. We derived images...
Comparison of velocity-log data collected using impeller and electromagnetic flowmeters
M.W. Newhouse, J. A. Izbicki, G.A. Smith
2005, Ground Water (43) 434-438
Previous studies have used flowmeters in environments that are within the expectations of their published ranges. Electromagnetic flowmeters have a published range from 0.1 to 79.0 m/min, and impeller flowmeters have a published range from 1.2 to 61.0 m/min. Velocity-log data collected in five long-screened production wells in the Pleasant...
Generation and validation of characteristic spectra from EO1 Hyperion image data for detecting the occurrence of the invasive species, Chinese tallow
Elijah W. Ramsey III, A. Rangoonwala, G. Nelson, R. Ehrlich, K. Martella
2005, International Journal of Remote Sensing (26) 1611-1636
Chinese tallow (Triadica sebifera) is an invasive tree that is spreading throughout the south-eastern United States and now into the west, and in many places causing extensive change to native habitat and associated wildlife. Detecting and mapping the relative distribution of this species is important to its control and eradication....
LogCauchy, log-sech and lognormal distributions of species abundances in forest communities
Z.-Y. Yin, S.-L. Peng, H. Ren, Q. Guo, Z.-H. Chen
2005, Ecological Modelling (184) 329-340
Species-abundance (SA) pattern is one of the most fundamental aspects of biological community structure, providing important information regarding species richness, species-area relation and succession. To better describe the SA distribution (SAD) in a community, based on the widely used lognormal (LN) distribution model with exp(-x2) roll-off on Preston's octave scale,...
Mercury burdens in Chinese mitten crabs (Eriocheir sinensis) in three tributaries of southern San Francisco Bay, California, USA
C. A. Hui, D. Rudnick, E. Williams
2005, Environmental Pollution (133) 481-487
Chinese mitten crabs (Eriocheir sinensis), endemic to Asia, were first reported in the San Francisco Bay in 1992. They are now established in nearly all San Francisco Bay tributaries. These crabs accumulate more metals, such as mercury, than crustaceans living in the water column. Because their predators include fish, birds,...
Real-time forecasts of tomorrow's earthquakes in California
M.C. Gerstenberger, S. Wiemer, L.M. Jones, P.A. Reasenberg
2005, Nature (435) 328-331
Despite a lack of reliable deterministic earthquake precursors, seismologists have significant predictive information about earthquake activity from an increasingly accurate understanding of the clustering properties of earthquakes. In the past 15 years, time-dependent earthquake probabilities based on a generic short-term clustering model have been made publicly available in near-real time...
Assessing contaminant sensitivity of endangered and threatened aquatic species: Part I. Acute toxicity of five chemicals
F.J. Dwyer, F.L. Mayer, L.C. Sappington, D.R. Buckler, C.M. Bridges, I.E. Greer, D.K. Hardesty, C.E. Henke, C.G. Ingersoll, J.L. Kunz, D.W. Whites, T. Augspurger, D.R. Mount, K. Hattala, G.N. Neuderfer
2005, Archives of Environmental Contamination and Toxicology (48) 143-154
Assessment of contaminant impacts to federally identified endangered, threatened and candidate, and state-identified endangered species (collectively referred to as "listed" species) requires understanding of a species' sensitivities to particular chemicals. The most direct approach would be to determine the sensitivity of a listed species to a particular contaminant or perturbation....
Possible pingos and a periglacial landscape in northwest Utopia Planitia
R.J. Soare, D.M. Burr, Bun Tseung J.-M. Wan
2005, Icarus (174) 373-382
Hydrostatic (closed-system) pingos are small, elongate to circular, ice-cored mounds that are perennial features of some periglacial landscapes. The growth and development of hydrostatic pingos is contingent upon the presence of surface water, freezing processes and of deep, continuous, ice-cemented permafrost. Other cold-climate landforms such as small-sized, polygonal patterned ground...
Reconnaissance study of late quaternary faulting along Cerro Goden fault zone, western Puerto Rico
P. Mann, C.S. Prentice, J.-C. Hippolyte, N.R. Grindlay, L.J. Abrams, D. Lao-Davila
2005, Special Paper of the Geological Society of America (385) 115-137
The Cerro Goden fault zone is associated with a curvilinear, continuous, and prominent topographic lineament in western Puerto Rico. The fault varies in strike from northwest to west. In its westernmost section, the fault is ∼500 m south of an abrupt, curvilinear mountain front separating the 270- to 361-m-high La...
Modeling of site occupancy dynamics for northern spotted owls, with emphasis on the effects of barred owls
Gail S. Olson, Robert G. Anthony, Eric D. Forsman, Steven H. Ackers, Peter J. Loschl, Janice A. Reid, Katie M. Dugger, Elizabeth M. Glenn, William J. Ripple
2005, Journal of Wildlife Management (69) 918-932
Northern spotted owls (Strix occidentalis caurina) have been studied intensively since their listing as a threatened species by the U.S. Fish and Wildlife Service in 1990. Studies of spotted owl site occupancy have used various binary response measures, but most of these studies have made the assumption that detectability is...
