Declustering of clustered preferential sampling for histogram and semivariogram inference
Ricardo A. Olea
2007, Mathematical Geology (39) 453-467
Measurements of attributes obtained more as a consequence of business ventures than sampling design frequently result in samplings that are preferential both in location and value, typically in the form of clusters along the pay. Preferential sampling requires preprocessing for the purpose of properly inferring characteristics of the parent population,...
Modeling dune response using measured and equilibrium bathymetric profiles
Laura A. Fauver, David M. Thompson, Asbury H. Sallenger Jr.
2007, Conference Paper, Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
Coastal engineers typically use numerical models such as SBEACH to predict coastal change due to extreme storms. SBEACH model inputs include pre-storm profiles, wave heights and periods, and water levels. This study focuses on the sensitivity of SBEACH to the details of pre-storm bathymetry. The SBEACH model is tested with...
Distinguishing native (Celastrus scandens L.) and invasive (C. orbiculatus Thunb.) bittersweet species using morphological characteristics
S. A. Leicht-Young, N.B. Pavlovic, R. Grundel, K.J. Frohnapple
2007, Journal of the Torrey Botanical Society (134) 441-450
Celastrus orbiculatus is an invasive liana in the Eastern United States. Its native congener, C. scandens, is less common and declining in the Northeast. The correct identification of these two species is often difficult because of their similar vegetative characteristics. Using morphological characteristics of both species growing naturally along a sand dune/forest...
Revisiting evolutionary dead ends in sockeye salmon ( Oncorhynchus nerka) life history
S.A. Pavey, T.R. Hamon, J.L. Nielsen
2007, Canadian Journal of Fisheries and Aquatic Sciences (64) 1199-1208
This study challenges recent hypotheses about sockeye salmon (Oncorhynchus nerka) colonization based on life history and broadens the pathways that investigators should consider when studying sockeye colonization of novel habitats. Most sockeye populations exhibit lake-type life histories. Riverine populations are thought to be more likely to stray from their natal...
Forces on stationary particles in near-bed turbulent flows
M.W. Schmeeckle, J. M. Nelson, R.L. Shreve
2007, Journal of Geophysical Research F: Earth Surface (112)
In natural flows, bed sediment particles are entrained and moved by the fluctuating forces, such as lift and drag, exerted by the overlying flow on the particles. To develop a better understanding of these forces and the relation of the forces to the local flow, the downstream and vertical components...
Dietary and spatial overlap between sympatric ursids relative to salmon use
Jennifer K. Fortin, Sean D. Farley, Karyn D. Rode, Charles T. Robbins
2007, Ursus (18) 19-29
We hypothesized that there would be minimal dietary overlap between sympatric brown bears (Ursus arctos) and American black bears (U. americanus) relative to salmon (Oncorhynchus spp.) utilization when alternative foods (e.g., fruits) are abundant. To maximize the chance that we would reject this hypothesis, we examined the diets of brown and black...
Characterizing dry deposition of mercury in urban runoff
M. Fulkerson, F.N. Nnadi, L.S. Chasar
2007, Water, Air, & Soil Pollution (185) 21-32
Stormwater runoff from urban surfaces often contains elevated levels of toxic metals. When discharged directly into water bodies, these pollutants degrade water quality and impact aquatic life and human health. In this study, the composition of impervious surface runoff and associated rainfall was investigated for several storm events at an...
Sequential solvent extraction for the modes of occurrence of selenium in coals of different ranks from the Huaibei Coalfield, China
Y. Zhang, Gaisheng Liu, C. L. Chou, L. Wang, Y. Kang
2007, Geochemical Transactions (8)
Forms of selenium in bituminous coal, anthracite, and cokeite (natural coke) from Huaibei Coalfield, Anhui, China, have been determined by sequential solvent extraction. The selenium content in bulk samples is 4.0, 2.4, and 2.0 ??g/g in bituminous coal, anthracite, and cokeite, respectively. The six forms of selenium determined by six-step...
First description of the nest, eggs, and breeding behavior of the Mérida Tapaculo (Scytalopus meridanus)
Karie L. Decker, Alina M. Niklison, Thomas E. Martin
2007, Wilson Journal of Ornithology (119) 121-124
We provide the first description of the nest, eggs, and breeding behavior of the Mérida Tapaculo (Scytalopus meridanus). Data are from one pair in the moist cloud forest of Yacambu National Park, Venezuela during April–May 2004. Two nests, constructed by the same pair, were globular in structure and consisted of...
Carbon isotopic compositions of organic matter across continental Cretaceous-Tertiary (K-T) boundary sections: Implications for paleoenvironment after the K-T impact event
T. Maruoka, C. Koeberl, B.F. Bohor
2007, Earth and Planetary Science Letters (253) 226-238
To assess the environmental perturbation induced by the impact event that marks the Cretaceous-Tertiary (K-T) boundary, concentrations and isotopic compositions of bulk organic carbon were determined in sedimentary rocks that span the terrestrial K-T boundary at Dogie Creek, Montana, and Brownie Butte, Wyoming in the Western Interior of the United...
A method to estimate groundwater depletion from confining layers
Leonard F. Konikow, Christopher E. Neuzil
2007, Water Resources Research (43)
Although depletion of storage in low‐permeability confining layers is the source of much of the groundwater produced from many confined aquifer systems, it is all too frequently overlooked or ignored. This makes effective management of groundwater resources difficult by masking how much water has been derived from storage and, in...
Survival of breeding Pacific common eiders on the Yukon-Kuskokwim Delta, Alaska
H.M. Wilson, Paul L. Flint, Christine L. Moran, A.N. Powell
2007, Journal of Wildlife Management (71) 403-410
Populations of Pacific common eiders (Somateria mollissima v-nigrum) breeding in Alaska, USA, have declined markedly over the past 40 years. We studied survival of adult female Pacific common eiders using capture—recapture of nesting hens at 3 sites on the Yukon-Kuskokwim Delta (YKD), Alaska from 1994 to 2004. We used data...
Evaluating planetary digital terrain models-The HRSC DTM test
C. Heipke, J. Oberst, J. Albertz, M. Attwenger, P. Dorninger, E. Dorrer, M. Ewe, S. Gehrke, K. Gwinner, H. Hirschmuller, J.R. Kim, Randolph L. Kirk, H. Mayer, Jan-Peter Muller, R. Rengarajan, M. Rentsch, R. Schmidt, F. Scholten, J. Shan, M. Spiegel, M. Wahlisch, G. Neukum
2007, Planetary and Space Science (55) 2173-2191
The High Resolution Stereo Camera (HRSC) has been orbiting the planet Mars since January 2004 onboard the European Space Agency (ESA) Mars Express mission and delivers imagery which is being used for topographic mapping of the planet. The HRSC team has conducted a systematic inter-comparison of different alternatives for the...
Spatial and temporal segregation of spawning habitat by catostomids in the Savannah River, Georgia and South Carolina, U.S.A.
T.B. Grabowski, J. Jeffery Isely
2007, Journal of Fish Biology (70) 782-798
Spawning aggregations of five species of catostomids were observed on the two mid-channel gravel bars of the Savannah River, Georgia and South Carolina, in 2004 and 2005 to assess the degree of spatial and temporal overlap in the use of this habitat and determine the habitat preferences leading to segregation....
High-resolution measurements of suspended-sediment
David J. Topping, Scott Wright, Theodore S. Melis, David M. Rubin
2007, Conference Paper, Proceedings of the Tenth International Symposium on River Sedimentation, August 1-4, 2007, Moscow, Russia
No abstract available....
Frequency of sublethal injury in a deepwater ophiuroid, Ophiacantha bidentata, an important component of western Atlantic Lophelia reef communities
Brooks R. Allen, M.S. Nizinski, Steve W. Ross, K. J. Sulak
2007, Marine Biology (152) 307-314
The occurrence and relative abundance of tissue (arm) regeneration in the ophiuroid, Ophiacantha bidentata (Retzius), was examined in individuals collected primarily among colonies of the deep-water coral Lophelia pertusa off the southeastern United States. Seven deep-water coral sites (384-756 m), located between Cape Lookout, NC, and Cape Canaveral, FL, were...
Nutrient vectors and riparian processing: A review with special reference to African semiarid savanna ecosystems
Shayne M. Jacobs, J.S. Bechtold, Harry C. Biggs, N. B. Grimm, S. Lorentz, M.E. McClain, R.J. Naiman, Steven S. Perakis, G. Pinay, M.C. Scholes
2007, Ecosystems (10) 1231-1249
This review article describes vectors for nitrogen and phosphorus delivery to riparian zones in semiarid African savannas, the processing of nutrients in the riparian zone and the effect of disturbance on these processes. Semiarid savannas exhibit sharp seasonality, complex hillslope hydrology and high spatial heterogeneity, all of which ultimately impact...
Local and regional factors affecting atmospheric mercury speciation at a remote location
H. Manolopoulos, J.J. Schauer, M.D. Purcell, T.M. Rudolph, Mark L. Olson, B. Rodger, David P. Krabbenhoft
2007, Journal of Environmental Engineering and Science (6) 491-501
Atmospheric concentrations of elemental (Hg0), reactive gaseous (RGM), and particulate (PHg) mercury were measured at two remote sites in the midwestern United States. Concurrent measurements of Hg0, PHg, and RGM obtained at Devil's Lake and Mt. Horeb, located approximately 65 km apart, showed that Hg0 and PHg concentrations were affected...
Survey of TES high albedo events in Mars' northern polar craters
J.C. Armstrong, S.K. Nielson, Timothy N. Titus
2007, Geophysical Research Letters (34)
Following the work exploring Korolev Crater (Armstrong et al., 2005) for evidence of crater interior ice deposits, we have conducted a survey of Thermal Emission Spectroscopy (TES) temperature and albedo measurements for Mars' northern polar craters larger than 10 km. Specifically, we identify a class of craters that exhibits brightening...
Habitat use of Etheostoma maculatum (Spotted Darter) in Elk River, West Virginia
E.A. Osier, S.A. Welsh
2007, Northeastern Naturalist (14) 447-460
Etheostoma maculatum (Spotted Darter) has a disjunct distribution within the Ohio River drainage. Researchers have generalized Spotted Darter habitat as large rocks in swift riffles. In West Virginia, Spotted Darters are known to occur only in the middle section of the Elk River system. Information on habitat use is lacking....
Body size mediated coexistence of consumers competing for resources in space
A. Basset, D.L. Angelis
2007, Oikos (116) 1363-1377
Body size is a major phenotypic trait of individuals that commonly differentiates co-occurring species. We analyzed inter-specific competitive interactions between a large consumer and smaller competitors, whose energetics, selection and giving-up behaviour on identical resource patches scaled with individual body size. The aim was to investigate whether pure metabolic constraints...
White sturgeon (Acipenser transmontanus) passage at the Dalles Dam, Columbia River, USA
M.J. Parsley, C.D. Wright, B. K. Van Der Leeuw, E.E. Kofoot, C.A. Peery, M.L. Moser
2007, Journal of Applied Ichthyology (23) 627-635
White sturgeon (Acipenser transmontanus) ???95 cm TL were monitored using acoustic and radio telemetry at a large hydroelectric dam (the Dalles Dam) on the Columbia River, during March 2004 through November 2005 to determine timing and routes of passage and to characterize general movements. Transmitters were surgically implanted into 148...
Nitrogen saturation in the Rocky Mountains: Linking emissions, deposition, and ecosystem effects using stable isotopes of nitrogen compounds
K. Campbell, L. Nanus, J.K. Böhlke, K. Harlin, J. Collett
2007, Conference Paper, Proceedings of the Air and Waste Management Association's Annual Conference and Exhibition, AWMA
Elevated levels of atmospheric N deposition are affecting terrestrial and aquatic ecosystems at high elevations in Rocky Mountain National Park and adjacent areas of the Front Range of Colorado. Federal and state agencies are now working together to develop cost-effective means for reducing atmospheric N deposition. A discussion on N...
A comparison of conventional capture versus PIT reader techniques for estimating survival and capture probabilities of big brown bats (Eptesicus fuscus)
L.E. Ellison, T. J. O'Shea, D.J. Neubaum, M.A. Neubaum, R.D. Pearce, R. A. Bowen
2007, Acta Chiropterologica (9) 149-160
We compared conventional capture (primarily mist nets and harp traps) and passive integrated transponder (PIT) tagging techniques for estimating capture and survival probabilities of big brown bats (Eptesicus fuscus) roosting in buildings in Fort Collins, Colorado. A total of 987 female adult and juvenile bats were captured and marked by...
Windy Mars: A dynamic planet as seen by the HiRISE camera
Nathan T. Bridges, Paul E. Geissler, Alfred S. McEwen, B.J. Thomson, Frank C. Chuang, Kenneth E. Herkenhoff, Laszlo P. Keszthelyi, Sara Martinez-Alonso
2007, Geophysical Research Letters (34)
With a dynamic atmosphere and a large supply of particulate material, the surface of Mars is heavily influenced by wind-driven, or aeolian, processes. The High Resolution Imaging Science Experiment (HiRISE) camera on the Mars Reconnaissance Orbiter (MRO) provides a new view of Martian geology, with the ability to see decimeter-size...
