Molecular ecology of the big brown bat (Eptesicus fuscus): Genetic and natural history variation in a hybrid zone
M.A. Neubaum, M.R. Douglas, M.E. Douglas, T. J. O'Shea
2007, Journal of Mammalogy (88) 1230-1238
Several geographically distinct mitochondrial DNA (mtDNA) lineages of the big brown bat (Eptesicus fuscus) have been documented in North America. Individuals from 2 of these lineages, an eastern and a western form, co-occur within maternity colonies in Colorado. The discovery of 2 divergent mtDNA lineages in sympatry prompted a set...
Acute toxicity of copper, ammonia, and chlorine to glochidia and juveniles of freshwater mussels (Unionidae)
N. Wang, C.G. Ingersoll, D.K. Hardesty, C.D. Ivey, J.L. Kunz, T.W. May, F.J. Dwyer, A.D. Roberts, T. Augspurger, C.M. Kane, R. J. Neves, M.C. Barnhart
2007, Environmental Toxicology and Chemistry (26) 2036-2047
The objective of the present study was to determine acute toxicity of copper, ammonia, or chlorine to larval (glochidia) and juvenile mussels using the recently published American Society for Testing and Materials (ASTM) Standard guide for conducting laboratory toxicity tests with freshwater mussels. Toxicity tests were conducted with glochidia (24-...
Tsunami inundation and sediment transport in vicinity of coastal mangrove forest
G. Gelfenbaum, D. Vatvani, B. Jaffe, F. Dekker
2007, Conference Paper, Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
Field measurements from Sumatra of tsunami wave height, erosion and deposition form a comprehensive data set that is tested against the Delft3D tsunami inundation and sediment transport model. Relative agreement between measured and modeled maximum water levels and sediment erosion and accumulation provides confidence that the model is reasonably characterizing...
Seabird behavior as an indicator of food supplies: Sensitivity across the breeding season
A.M.A. Harding, John F. Piatt, Joel A. Schmutz
2007, Marine Ecology Progress Series (352) 269-274
We used empirical data on the time allocation of common murres Uria aalge in relation to measures of local prey density to examine whether adults provisioning chicks are more sensitive to changes in prey density than birds that are incubating eggs. We hypothesized that seasonal differences in food requirements of...
Radiometric calibration status of Landsat-7 and Landsat-5
J. A. Barsi, B. L. Markham, D. L. Helder, G. Chander
2007, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
Launched in April 1999, Landsat-7 ETM+ continues to acquire data globally. The Scan Line Corrector in failure in 2003 has affected ground coverage and the recent switch to Bumper Mode operations in April 2007 has degraded the internal geometric accuracy of the data, but the radiometry has been unaffected. The...
Time-optimum packet scheduling for many-to-one routing in wireless sensor networks
W.-Z. Song, F. Yuan, R. LaHuser
2007, Conference Paper, 2006 IEEE International Conference on Mobile Ad Hoc and Sensor Systems, MASS
This paper studies the WSN application scenario with periodical traffic from all sensors to a sink. We present a time-optimum and energy-efficient packet scheduling algorithm and its distributed implementation. We first give a general many-to-one packet scheduling algorithm for wireless networks, and then prove that it is time-optimum and costs...
Linking ground-water age and chemistry data along flow paths: Implications for trends and transformations of nitrate and pesticides
A. J. Tesoriero, D. A. Saad, K.R. Burow, E. A. Frick, L.J. Puckett, J.E. Barbash
2007, Journal of Contaminant Hydrology (94) 139-155
Tracer-based ground-water ages, along with the concentrations of pesticides, nitrogen species, and other redox-active constituents, were used to evaluate the trends and transformations of agricultural chemicals along flow paths in diverse hydrogeologic settings. A range of conditions affecting the transformation of nitrate and pesticides (e.g., thickness of unsaturated zone, redox...
Risk assessment of water quality in three North Carolina, USA, streams supporting federally endangered freshwater mussels (Unionidae)
S. Ward, T. Augspurger, F.J. Dwyer, C. Kane, C.G. Ingersoll
2007, Environmental Toxicology and Chemistry (26) 2075-2085
Water quality data were collected from three drainages supporting the endangered Carolina heelsplitter (Lasmigona decorata) and dwarf wedgemussel (Alasmidonta heterodon) to determine the potential for impaired water quality to limit the recovery of these freshwater mussels in North Carolina, USA. Total recoverable copper, total residual chlorine, and total ammonia nitrogen...
Survival and breeding advantages of larger Black Brant (Branta bernicla nigricans) goslings: Within- and among-cohort variation
J.S. Sedinger, N.D. Chelgren
2007, The Auk (124) 1281-1293
We examined the relationship between mass late in the first summer and survival and return to the natal breeding colony for 12 cohorts (1986-1997) of female Black Brant (Branta bernicla nigricans). We used Cormack-Jolly-Seber methods and the program MARK to analyze capture-recapture data. Models included two kinds of residuals from...
Downhole receiver function: A case study
K. Mehta, R. Snieder, V. Graizer
2007, Bulletin of the Seismological Society of America (97) 1396-1403
Receiver function is defined as the spectral ratio of the radial component and the vertical component of the ground motion. It is used to characterize converted waves. We extend the use of the receiver function to downhole data using waves recorded in a borehole, excited by an earthquake of magnitude...
The response of spit shapes to wave-angle climates
A.D. Ashton, A.B. Murray, R. Littlewood
2007, Conference Paper, Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
We investigate spit formation and evolution in light of the high-wave-angle instability in shoreline shape arising from a maximizing angle for wave-driven alongshore sediment transport. Single spits emerge in a simple one-contour line numerical model that evolves the coast using morphodynamic feedbacks and a 'climate' of waves approaching the shore...
Using topographic lidar data to delineate the North Carolina Shoreline
Patrick W. Limber, Jeffrey H. List, Jeffrey D. Warren, Amy S. Farris, Kathryn M. Weber
2007, Conference Paper, Coastal Sediments '07 - Proceedings of 6th International Symposium on Coastal Engineering and Science of Coastal Sediment Processes
In North Carolina, shoreline change rates are an important component of the state's coastal management program. To enhance methods of measuring shoreline change, the NC Division of Coastal Management (DCM) is considering using mean high water (MHW) shorelines extracted from lidar data together with traditional wet/dry shorelines digitized from aerial...
Measurement of atmospheric mercury species with manual sampling and analysis methods in a case study in Indiana
M.R. Risch, E.M. Prestbo, L. Hawkins
2007, Water, Air, & Soil Pollution (184) 285-297
Ground-level concentrations of three atmospheric mercury species were measured using manual sampling and analysis to provide data for estimates of mercury dry deposition. Three monitoring stations were operated simultaneously during winter, spring, and summer 2004, adjacent to three mercury wet-deposition monitoring stations in northern, central, and southern Indiana. The monitoring...
Coupled changes in sand grain size and sand transport driven by changes in the upstream supply of sand in the Colorado River: relative importance of changes in bed-sand grain size and bed-sand area
D.J. Topping, D. M. Rubin, T.S. Melis
2007, Sedimentary Geology (202) 538-561
Sand transport in the Colorado River in Marble and Grand canyons was naturally limited by the upstream supply of sand. Prior to the 1963 closure of Glen Canyon Dam, the river exhibited the following four effects of sand supply limitation: (1) hysteresis in sediment concentration, (2) hysteresis in sediment grain...
Assessing the likely value of gravity and drawdown measurements to constrain estimates of hydraulic conductivity and specific yield during unconfined aquifer testing
Joan B. Blainey, Ty P.A. Ferré, Jeffrey T. Cordova
2007, Water Resources Research (43)
Pumping of an unconfined aquifer can cause local desaturation detectable with high‐resolution gravimetry. A previous study showed that signal‐to‐noise ratios could be predicted for gravity measurements based on a hydrologic model. We show that although changes should be detectable with gravimeters, estimations of hydraulic conductivity and specific yield based on...
The persistence of directivity in small earthquakes
J. Boatwright
2007, Bulletin of the Seismological Society of America (97) 1850-1861
We derive a simple inversion of peak ground acceleration (PGA) or peak ground velocity (PGV) for rupture direction and rupture velocity and then test this inversion on the peak motions obtained from seven 3.5≤M≤4.1 earthquakes that occurred in two clusters in November 2002...
Generation and propagation of nonlinear internal waves in Massachusetts Bay
A. Scotti, R.C. Beardsley, B. Butman
2007, Journal of Geophysical Research C: Oceans (112)
During the summer, nonlinear internal waves (NLIWs) are commonly observed propagating in Massachusetts Bay. The topography of the area is unique in the sense that the generation area (over Stellwagen Bank) is only 25 km away from the shoaling area, and thus it represents an excellent natural laboratory to study...
Modeling englacial radar attenuation at Siple Dome, West Antarctica, using ice chemistry and temperature data
J.A. MacGregor, D.P. Winebrenner, H. Conway, K. Matsuoka, P.A. Mayewski, G.D. Clow
2007, Journal of Geophysical Research F: Earth Surface (112)
The radar reflectivity of an ice-sheet bed is a primary measurement for discriminating between thawed and frozen beds. Uncertainty in englacial radar attenuation and its spatial variation introduces corresponding uncertainty in estimates of basal reflectivity. Radar attenuation is proportional to ice conductivity, which depends on the concentrations of acid and...
Survey of selected pathogens and blood parameters of northern yellowstone elk: Wolf sanitation effect implications
S. M. Barber-Meyer, P.J. White, L.D. Mech
2007, American Midland Naturalist (158) 369-381
The restoration or conservation of predators could reduce seroprevalences of certain diseases in prey if predation selectively removes animals exhibiting clinical signs. We assessed disease seroprevalences and blood parameters of 115 adult female elk (Cervus elaphus) wintering on the northern range of Yellowstone National Park [YNP] during 2000-2005 and compared...
Regional dynamics of grassland change in the western Great Plains
M.A. Drummond
2007, Conference Paper, Great Plains Research
This paper examines the contemporary land-cover changes in two western Great Plains ecoregions between 1973 and 2000. Agriculture and other land uses can have a substantial effect on grassland cover that varies regionally depending on the primary driving forces of change. In order to better understand change, the rates, types,...
Arthropod prey of Wilson's Warblers in the understory of Douglas-fir forests
J.C. Hagar, K.M. Dugger, E. E. Starkey
2007, Wilson Journal of Ornithology (119) 533-546
Availability of food resources is an important factor in avian habitat selection. Food resources for terrestrial birds often are closely related to vegetation structure and composition. Identification of plant species important in supporting food resources may facilitate vegetation management to achieve objectives for providing bird habitat. We used fecal analysis...
Validation of streamflow measurements made with acoustic doppler current profilers
K. Oberg, D. S. Mueller
2007, Journal of Hydraulic Engineering (133) 1421-1432
The U.S. Geological Survey and other international agencies have collaborated to conduct laboratory and field validations of acoustic Doppler current profiler (ADCP) measurements of streamflow. Laboratory validations made in a large towing basin show that the mean differences between tow cart velocity and ADCP bottom-track and water-track velocities were -0.51...
Consistency of L4 TM absolute calibration with respect to the L5 TM sensor based on near-simultaneous image acquisition
G. Chander, D. L. Helder, R. Malla, E. Micijevic, C. J. Mettler
2007, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
The Landsat archive provides more than 35 years of uninterrupted multispectral remotely sensed data of Earth observations. Since 1972, Landsat missions have carried different types of sensors, from the Return Beam Vidicon (RBV) camera to the Enhanced Thematic Mapper Plus (ETM+). However, the Thematic Mapper (TM) sensors on Landsat 4...
A crustal seismic velocity model for the UK, Ireland and surrounding seas
A. Kelly, R.W. England, Peter K.H. Maguire
2007, Geophysical Journal International (171) 1172-1184
A regional model of the 3-D variation in seismic P-wave velocity structure in the crust of NW Europe has been compiled from wide-angle reflection/refraction profiles. Along each 2-D profile a velocity–depth function has been digitised at 5 km intervals. These 1-D velocity functions were mapped into three dimensions using ordinary...
Spatial and temporal variability in oceanographic and meteorologic forcing along Central California and its implications on nearshore processes
D.K. Wingfield, C. D. Storlazzi
2007, Journal of Marine Systems (68) 457-472
In the past two decades, the understanding of the important large-scale phenomena (El Niño, upwelling, California current, etc) that drive physical, chemical, and biological processes along the US West Coast has greatly improved. However, the ability to predict the influence of annual and inter-annual events on a regional scale still...
