Stable isotope composition of waters in the Great Basin, United States 1. Air-mass trajectories
I. Friedman, J.M. Harris, G.I. Smith, C. A. Johnson
2002, Journal of Geophysical Research D: Atmospheres (107)
Isentropic trajectories, calculated using the NOAA/Climate Monitoring and Diagnostics Laboratory's isentropic transport model, were used to determine air-parcel origins and the influence of air mass trajectories on the isotopic composition of precipitation events that occurred between October 1991 and September 1993 at Cedar City, Utah, and Winnemucca, Nevada. Examination of...
High-resolution characterization of chemical heterogeneity in an alluvial aquifer
M.K. Schulmeister, J.M. Healey, J.J. Butler, G.W. McCall, S. Birk
2002, IAHS-AISH Publication 419-424
The high-resolution capabilities of direct push technology were exploited to develop new insights into the hydrochemistry at the margin of an alluvial aquifer. Hydrostratigraphic controls on groundwater flow and contaminant loading were revealed through the combined use of direct push electrical conductivity (EC) logging and geochemical profiling. Vertical and lateral...
Evaluation of Light Detection and Ranging (LIDAR) for measuring river corridor topography
Z.H. Bowen, R.G. Waltermire
2002, Journal of the American Water Resources Association (38) 33-41
LIDAR is relatively new in the commercial market for remote sensing of topography and it is difficult to find objective reporting on the accuracy of LIDAR measurements in an applied context. Accuracy specifications for LIDAR data in published evaluations range from 1 to 2 m root mean square error (RMSEx,y)...
Breeding habitat use by sympatric and allopatric populations of Wilson's Warblers and Yellow Warblers
J. M. Ruth, Thomas R. Stanley
2002, Journal of Field Ornithology (73) 412-419
We studied Wilson's Warbler (Wilsonia pusilla) and Yellow Warbler (Dendroica petechia) habitat use in allopatric and sympatric populations in the Rocky Mountains of northern Colorado and southeastern Wyoming in order to better understand the different habitat needs and interactions of these two species. Foraging Wilson's Warblers and Yellow...
River discharge measurements by using helicopter-mounted radar
N.B. Melcher, J. E. Costa, F.P. Haeni, R. T. Cheng, E.M. Thurman, M. Buursink, K.R. Spicer, E. Hayes, W.J. Plant, W.C. Keller, K. Hayes
2002, Geophysical Research Letters (29) 41-1-41-4
The United States Geological Survey and the University of Washington collaborated on a series of initial experiments on the Lewis, Toutle, and Cowlitz Rivers during September 2000 and a detailed experiment on the Cowlitz River during May 2001 to determine the feasibility of using helicopter-mounted radar to measure river discharge....
Rates and patterns of late Cenozoic denudation in the northernmost Atlantic Coastal Plain and Piedmont
S.D. Stanford, G.M. Ashley, E.W.B. Russell, G.J. Brenner
2002, Geological Society of America Bulletin (114) 1422-1437
Topography of a 2800 km2 section of the U.S. Atlantic Coastal Plain and Piedmont is reconstructed at five times from the late Miocene to the Holocene. The reconstructions are based on mapping of fluvial, colluvial, and marginal-marine deposits that are dated by radiocarbon, palynostratigraphy, and correlation to adjacent glacial and...
Western Sandpipers (Calidris mauri) during the non-breeding season: Spatial segregation on a hemispheric scale
Silke Nebel, David B. Lank, Patrick D. O'Hara, Guillermo Fernandez, Ben Haase, Francisco Delgado, Felipe A. Estela, Lesley J. Evans Ogden, Brian A. Harrington, Barbara E. Kus, James E. Lyons, Francine Mercier, Brent Ortego, John Y. Takekawa, Nils Warnock, Sarah E. Warnock
2002, The Auk (119) 922-928
The nonbreeding distribution of Western Sandpipers (Calidris mauri) was documented using 19 data sets from 13 sites along the Pacific and Atlantic coasts of the Americas. Western Sandpipers showed latitudinal segregation with regard to sex and age. Females wintered farther south than males. A “U” shaped pattern was found with...
The surface rupture and slip distribution of the 17 August 1999 Izmit earthquake (M 7.4), North Anatolian fault
A. Barka, H.S. Akyuz, E. Altunel, G. Sunal, Z. Cakir, A. Dikbas, B. Yerli, R. Armijo, B. Meyer, J. B. De Chabalier, Thomas Rockwell, J.R. Dolan, R. Hartleb, Tim Dawson, S. Christofferson, A. Tucker, T. Fumal, Rob Langridge, H. Stenner, William Lettis, J. Bachhuber, W. Page
2002, Bulletin of the Seismological Society of America (92) 43-60
The 17 August 1999 İzmit earthquake occurred on the northern strand of the North Anatolian fault zone. The earthquake is associated with a 145-km-long surface rupture that extends from southwest of Düzce in the east to west of Hersek delta in the west. Detailed mapping of the surface rupture shows...
Alien annual plants and wildfire in desert tortoise habitat: status, ecological effects, and management
M.L. Brooks, T. C. Esque
2002, Chelonian Conservation and Biology (4) 330-340
Association of methylmercury with dissolved humic acids
A. Amirbahman, A.L. Reid, T.A. Haines, J. S. Kahl, C. Arnold
2002, Environmental Science & Technology (36) 690-695
Sorption of methylmercury (MeHg) to three different humic acids was investigated as a function of pH and humic concentration. The extent of sorption did not show a strong pH dependence within the pH range of 5−9. Below pH 5, a decrease in adsorption for all humic samples was observed. The...
Crosswell seismic investigation of hydraulically conductive, fracture bedrock near Mirror Lake, New Hampshire
K.J. Ellefsen, P. A. Hsieh, A.M. Shapiro
2002, Journal of Applied Geophysics (50) 299-317
Near Mirror Lake, New Hampshire (USA), hydraulically conductive, fractured bedrock was investigated with the crosswell seismic method to determine whether this method could provide any information about hydraulic conductivity between wells. To this end, crosswell seismic data, acoustic logs from boreholes, image logs from...
The earthquake potential of the New Madrid seismic zone
Martitia P. Tuttle, Eugene S. Schweig, John D. Sims, Robert H. Lafferty III, Lorraine W. Wolf, Marion L. Haynes
2002, Bulletin of the Seismological Society of America (92) 2080-2089
The fault system responsible for New Madrid seismicity has generated temporally clustered very large earthquakes in A.D. 900 ± 100 years and A.D. 1450 ± 150 years as well as in 1811–1812. Given the uncertainties in dating liquefaction features, the time between the past three New Madrid events may be...
Activity patterns and time budgets of the declining sea otter population at Amchitka Island, Alaska
Thomas S. Gelatt, Donald B. Siniff, James A. Estes
2002, Journal of Wildlife Management (66) 29-39
Time budgets of predators may reflect population status if time spent foraging varies with local prey abun- dance. We assumed that the sea otter (Enhydra lutris) population at Amchitka Island, Alaska, USA, had been at equilibrium since the early 1960s and collected time budgets of otters to be used to...
Predation on exotic zebra mussels by native fishes: Effects on predator and prey
D.D. Magoulick, L.C. Lewis
2002, Freshwater Biology (47) 1908-1918
1. Exotic zebra mussels, Dreissena polymorpha, occur in southern U.S. waterways in high densities, but little is known about the interaction between native fish predators and zebra mussels. Previous studies have suggested that exotic zebra mussels are low profitability prey items and native vertebrate predators are unlikely to reduce zebra...
Of mice and mallards: Positive indirect effects of coexisting prey on waterfowl nest success
Joshua T. Ackerman
2002, Oikos (99) 469-480
Coexisting prey species interact indirectly via their shared predators when one prey type influences predation rates of the second prey type. In a temperate system where the predominant shared predator is a generalist, I studied the indirect effects of rodent populations on waterfowl nest success, both within the nesting season...
Mercury in feathers from Chilean birds: Influence of location, feeding strategy and taxonomic affiliation
H. G. Ochoa-Acuna, M. S. Sepulveda, T. S. Gross
2002, Marine Pollution Bulletin (44) 340-349
This study reports baseline concentrations of mercury (Hg) in feathers from different species of birds sampled at various locations off the Chilean coast (Southeastern Pacific). Hg concentrations were evaluated in relation to geographic location, taxonomic affiliation, and feeding strategies. Between January and March of 1995, we collected mature contour feathers...
Spatial variability of shelf sediments in the STRATAFORM natural laboratory, Northern California
J.A. Goff, R. A. Wheatcroft, H. Lee, D.E. Drake, D.J.P. Swift, S. Fan
2002, Continental Shelf Research (22) 1199-1223
The "Correlation Length Experiment", an intensive box coring effort on the Eel River shelf (Northern California) in the summer of 1997, endeavored to characterize the lateral variability of near-surface shelf sediments over scales of meters to kilometers. Coring focused on two sites, K60 and S60, separated by ??? 15 km...
Gold deposits in the Xiaoqinling-Xiong'ershan region, Qinling mountains, central China
J. Mao, R.J. Goldfarb, Z. Zhang, W. Xu, Yumin Qiu, J. Deng
2002, Mineralium Deposita (37) 306-325
The gold-rich Xiaoqinling-Xiong'ershan region in eastern Shaanxi and western Henan provinces, central China, lies about 30-50 km inland of the southern margin of the North China craton. More than 100 gold deposits and occurrences are concentrated in the Xiaoqinling (west), Xiaoshan (middle), and Xiong'ershan (east) areas. Late Archean gneiss of...
Transportation impacts to wildlife on state route 37 in northern San Pablo Bay, California
Bryan R. Winton, John Y. Takekawa
2002, Transactions of the Western Section of the Wildlife Society (37) 55-60
State Route 37 bisects conservation lands managed by San Pablo Bay National Wildlife Refuge (U.S. Fish & Wildlife Service) and Napa-Sonoma Marshes Wildlife Area (California Department of Fish and Game) in Solano and Sonoma Counties. The 2-lane highway connects Interstates 101 and 80 in northern San Francisco Bay and experiences...
Waterbird use of bayland wetlands in the San Francisco Bay estuary: Movements of long-billed dowitchers during the winter
John Y. Takekawa, Nils Warnock, G.M. Martinelli, A. Keith Miles, Danika C. Tsao
2002, Waterbirds (25) 93-105
The San Francisco Bay estuary is a migration and wintering area for more than 1.5 million waterbirds on the west coast of North America. Because the estuary is located in a metropolitan area, development and diking of baylands (the region between the edge of the bay and the historical high...
The use of geographic information for fire management planning in Yosemite National Park
Jan W. Van Wagtendonk, Kent A. van Wagtendonk, Joseph B. Meyer, Kara J. Paintner
2002, The George Wright Forum (19) 19-39
Fire has played a critical role in the ecosystems of Yosemite National park for millennia. Before the advent of Euro-Americans, lightning fires and fires set by Native Americans burned freely across the landscape. These fires burned periodically, with the interval between fires dependent on the availability of ignition sources, adequate...
Nitrogen retention in rivers: Model development and application to watersheds in the northeastern U.S.A.
S.P. Seitzinger, R.V. Styles, E.W. Boyer, R. B. Alexander, G. Billen, R. W. Howarth, B. Mayer, N. Van Breemen
2002, Conference Paper, Biogeochemistry
A regression model (RivR-N) was developed that predicts the proportion of N removed from streams and reservoirs as an inverse function of the water displacement time of the water body (ratio of water body depth to water time of travel). When applied to 16 drainage networks in the eastern U.S.,...
Effect of deer exclusion by fencing on abundance of Amblyomma americanum (Acari: Ixodidae) on Fire Island, New York, USA
H. S. Ginsberg, M. Butler, E. Zhioua
2002, Journal of Vector Ecology (27) 215-221
The effects of deer exclusion on northern populations of lone star ticks, Amblyomma americanum, were tested at the Lighthouse Tract, Fire Island, NY, USA, where densities of this species have increased recently. Game fencing was erected to exclude deer from two sites of roughly one ha each, and populations of...
Polychlorinated biphenyls and toxaphene in Pacific tree frog tadpoles (Hyla regilla) from the California Sierra Nevada, USA
Jeffrey E. Angermann, Gary M. Fellers, Fumio Matsumura
2002, Environmental Toxicology and Chemistry (21) 2209-2215
Pacific tree frog (Hyla regilla) tadpoles were collected throughout the Sierra Nevada mountain range, California, USA, in 1996 and 1997 and analyzed for the presence of polychlorinated biphenyls (PCBs) and toxaphene. Whole-tadpole Σ PCB levels ranged from 244 ng/g (wet wt) at lower elevations on the western slope to 1.6...
Gravitational failure of sea cliffs in weakly lithified sediment
M. A. Hampton
2002, Environmental & Engineering Geoscience (8) 175-191
Gravitational failure of sea cliffs eroded into weakly lithified sediment at several sites in California involves episodic stress-release fracturing and cantilevered block falls. The principal variables that influence the gravitational stability are tensional stresses generated during the release of horizontal confining stress and weakening of the sediment with increased saturation...
