Kittiwakes strategically reduce investment in replacement clutches
J. Gasparini, A. Roulin, V.A. Gill, Scott A. Hatch, T. Boulinier
2006, Proceedings of the Royal Society B: Biological Sciences (273) 1551-1554
Many life-history traits are expressed interactively in life, but to a varying extent on different occasions. Changes in trait expression can be accounted for by differences in the quality of the environment (‘environmental constraint’ hypothesis) or by strategic adjustments, if the relative contribution of the trait to fitness varies with...
Remote sensing studies of the Dionysius region of the Moon
Thomas A. Giguere, B. Ray Hawke, Lisa R. Gaddis, David T. Blewett, J. J. Gillis-Davis, Paul G. Lucey, G.A. Smith, P. D. Spudis, G.J. Taylor
2006, Journal of Geophysical Research E: Planets (111)
The Dionysius region is located near the western edge of Mare Tranquillitatis and is centered on Dionysius crater, which exhibits a well-developed dark ray system. Proposed origins for these dark rays included impact melt deposits and dark primary ejecta. The region also contains extensive deposits of Cayley-type light plains. Clementine...
A stochastic estimate of ground motion at Oceano, California, for the M 6.5 22 December 2003 San Simeon earthquake, derived from aftershock recordings
Alessandro C. Di, J. Boatwright
2006, Bulletin of the Seismological Society of America (96) 1437-1447
The U.S. Geological Survey deployed a digital seismic station in Oceano, California, in February 2004, to investigate the cause of damage and liquefaction from the 22 December 2003 M 6.5 San Simeon earthquake. This station recorded 11 M > 2.8 aftershocks in almost 8 weeks. We analyze these recordings, together...
Distribution of spawning activity by anadromous fishes in an atlantic slope drainage after removal of a low-head dam
S. M. Burdick, J.E. Hightower
2006, Transactions of the American Fisheries Society (135) 1290-1300
In 1998, the Quaker Neck Dam was removed from the Neuse River near Goldsboro, North Carolina, restoring access to more than 120 km of potential main-stem spawning habitat and 1,488 km of potential tributary spawning habitat to anadromous fishes. We used plankton sampling and standardized electrofishing to examine the extent...
Influence of deflection on a fold-to-fault progression: field evidence from near Marietta, South Carolina
C.W. Clendenin, J.M. Garihan
2006, Journal of Structural Geology (28) 1316-1326
Four periods of deformation (D1-D4) are recognized in the Lion Park Road borrow pit near Marietta, South Carolina. Although each period is characterized by distinct structures, D3 produced two structural styles (D3a, D3b) resulting from layer-parallel shortening. D3a is characterized by detachment folding at the tip of an underlying thrust....
Direct test of static stress versus dynamic stress triggering of aftershocks
F. F. Pollitz, M.J.S. Johnston
2006, Geophysical Research Letters (33)
Aftershocks observed over time scales of minutes to months following a main shock are plausibly triggered by the static stress change imparted by the main shock, dynamic shaking effects associated with passage of seismic waves from the main shock, or a combination of the two. We design a direct test...
Seasonal persistence and population characteristics of Escherichia coli and entercocci in deep backshore sand of two freshwater beaches
M.N. Byappanahalli, R.L. Whitman, D.A. Shively, W.T.E. Ting, C.C. Tseng, M.B. Nevers
2006, Journal of Water and Health (4) 313-320
We studied the shoreward and seasonal distribution of E. coli and enterococci in sand (at the water table) at two southern Lake Michigan beaches—Dunbar and West Beach (in Indiana). Deep, backshore sand (∼20 m inland) was regularly sampled for 15 months during 2002–2003. E. coli counts were not significantly different in samples taken at 5-m...
Mineral resource of the month: nickel
Peter H. Kuck
2006, Geotimes (2006)
Together with chromium, nickel makes steel more resistant to corrosion. Stainless steel thus accounts for more than 65 percent of primary nickel consumption in the world. One of the more common grades of stainless steel is Type 304, which contains 18 to 20 percent chromium and 10.5 to 12 percent...
Mineral resource of the month: beryllium
Kim B. Shedd
2006, Geotimes (2006)
Beryllium metal is lighter than aluminum and stiffer than steel. These and other properties, including its strength, dimensional stability, thermal properties and reflectivity, make it useful for aerospace and defense applications, such as satellite and space-vehicle structural components. Beryllium’s nuclear properties, combined with its low density, make it useful as...
Variability and regulation of denitrification in an Upper Mississippi River backwater
E.A. Strauss, W. B. Richardson, J.C. Cavanaugh, L.A. Bartsch, Rebecca M. Kreiling, A.J. Standorf
2006, Journal of the North American Benthological Society (25) 596-606
Sediments in the backwaters of the Upper Mississippi River (UMR) are highly organic and provide an optimal environment for N removal. We monitored an 8.6-ha UMR backwater site near La Crosse, Wisconsin, for nearly 3 y to assess temporal variability, seasonal trends, and the factors regulating denitrification. We measured rates...
Vulnerability of shallow groundwater and drinking-water wells to nitrate in the United States
Bernard T. Nolan, Kerie J. Hitt
2006, Environmental Science & Technology (40) 7834-7840
Two nonlinear models were developed at the national scale to (1) predict contamination of shallow ground water (typically < 5 m deep) by nitrate from nonpoint sources and (2) to predict ambient nitrate concentration in deeper supplies used for drinking. The new models have several advantages over previous national-scale approaches....
United States of America
D.E. Napton, Thomas R. Loveland
H. Geist, editor(s)
2006, Book chapter, Our Earth's changing land— An encyclopedia of land-use and land-cover change
No abstract available....
High-resolution seismic-reflection imaging 25 years of change in I-70 sinkhole, Russell County, Kansas
R. D. Miller, D.W. Steeples, J.L. Lambrecht, N. Croxton
2006, SEG Technical Program Expanded Abstracts (25) 1411-1415
Time-lapse seismic reflection imaging improved our understanding of the consistent, gradual surface subsidence ongoing at two sinkholes in the Gorham Oilfield discovered beneath a stretch of Interstate Highway 70 through Russell and Ellis Counties in Kansas in 1966. With subsidence occurring at a rate of around 10 cm per year...
Effect of reduced winter precipitation and increased temperature on watershed solute flux, 1988-2002, Northern Michigan
R. Stottlemyer, D. Toczydlowski
2006, Biogeochemistry (77) 409-440
Since 1987 we have studied weekly change in winter (December-April) precipitation, snowpack, snowmelt, soil water, and stream water solute flux in a small (176-ha) Northern Michigan watershed vegetated by 65-85 year-old northern hardwoods. Our primary study objective was to quantify the effect of change in winter temperature and precipitation on...
Resolving structural influences on water-retention properties of alluvial deposits
K.A. Winfield, J. R. Nimmo, J. A. Izbicki, P. M. Martin
2006, Vadose Zone Journal (5) 706-719
With the goal of improving property-transfer model (PTM) predictions of unsaturated hydraulic properties, we investigated the influence of sedimentary structure, defined as particle arrangement during deposition, on laboratory-measured water retention (water content vs. potential [θ(ψ)]) of 10 undisturbed core samples from alluvial deposits in the western Mojave Desert, California. The...
Hydrologic-hydraulic analysis of the Toa Vaca Dam
T.-S. Heriberto, A.C. MillerArthur
2006, Conference Paper, Association of State Dam Safety Officials - Dam Safety 2006, Proceedings from the 2006 Annual Conference
[No abstract available]...
Low-temperature MTBE biodegradation in aquifer sediments with a history of low, seasonal ground water temperatures
P. M. Bradley, J. E. Landmeyer
2006, Ground Water Monitoring and Remediation (26) 101-105
Sediments from two shallow, methyl tert‐butyl ether (MTBE)–contaminated aquifers, with mean ground water temperatures ∼10°C, demonstrated significant mineralization of [U‐14C] MTBE to 14CO2 at incubation temperatures as low as 4°C. These results indicate that microbial degradation can continue to contribute to the attenuation of MTBE in ground water under...
State summaries: California
S. G. Kohl
2006, Mining Engineering (58) 70-74
According to the United States Geological Survey (USGS), California ranked second behind Arizona among the states in nonfuel mineral production during 2005. It accounted for 7% of the US's total. The market value of mineral production for California amounted to $3.7 billion. During the year, California produced 30 varieties of...
Geophysical evaluation of the Success Dam foundation, Porterville, California
L. E. Hunter, M.H. Powers, S. Haines, T. Asch, B.L. Burton, D.C. Serafini
2006, Conference Paper, Association of State Dam Safety Officials - Dam Safety 2006, Proceedings from the 2006 Annual Conference
Success Dam is a zonedearth fill embankment located near Porterville, CA. Studies of Success Dam by the recent Dam Safety Assurance Program (DSAP) have demonstrated the potential for seismic instability and large deformation of the dam due to relatively low levels of earthquake shaking. The U.S. Army Corps of Engineers...
Ichthyophonus sp. in adult Chinook salmon (Oncorhynchus tshawytscha)
Diane G. Elliott
D.W. Bruno, D.G. Elliott, B. Nowak, editor(s)
2006, Conference Paper, EAFP 2005 Copenhagen Histopathology Workshop. Reproductive pathology and early life stages pathology: Notes and images
No abstract available....
Degradation of water quality by bird feces in and around managed wetlands
G.G. Shellenbarger, A.B. Boehm
2006, Conference Paper, Proceedings of the South Bay Science Symposium
No abstract available....
Evaluating light-based geolocation for estimating demersal fish movements in high latitudes
Andrew C. Seitz, Brenda L. Norcross, Derek Wilson, Jennifer L. Nielsen
2006, Fishery Bulletin (104) 571-578
We evaluated light-based geolocation estimates from pop-up satellite tags in high latitudes because some of the largest fisheries in the world are in areas where this technique has not been assessed. Daily longitude and latitude were estimated by using two Wildlife Computers software programs: 1) Argos Message Processor (AMP), which...
Development of the performance confirmation program at YUCCA mountain, nevada
G.D. LeCain, D. Barr, D. Weaver, R. Snell, S.W. Goodin, F.D. Hansen
2006, Conference Paper, Proceedings of the 11th International High Level Radioactive Waste Management Conference, IHLRWM
The Yucca Mountain Performance Confirmation program consists of tests, monitoring activities, experiments, and analyses to evaluate the adequacy of assumptions, data, and analyses that form the basis of the conceptual and numerical models of flow and transport associated with a proposed radioactive waste repository at Yucca Mountain, Nevada. The Performance...
Dominance and environmental correlates of alien annual plants in the Mojave Desert, USA
M.L. Brooks, K.H. Berry
2006, Journal of Arid Environments (67) 100-124
Land managers are concerned about the negative effects of alien annual plants on native plants, threatened and endangered species such as the desert tortoise (Gopherus agassizii), and ecosystem integrity in the Mojave Desert. Management of alien plants is hampered by a lack of information regarding the dominance and environmental correlates...
Trophic transfer of trace metals from the polychaete worm Nereis diversicolor to the polychaete N. virens and the decapod crustacean Palaemonetes varians
P.S. Rainbow, L. Poirier, B. D. Smith, K.V. Brix, S. N. Luoma
2006, Marine Ecology Progress Series (321) 167-181
Diet is an important exposure route for the uptake of trace metals by aquatic invertebrates, with trace metal trophic transfer depending on 2 stages - assimilation and subsequent accumulation by the predator. This study investigated the trophic transfer of trace metals from the sediment-dwelling polychaete worm Nereis diversicolor from metal-rich...
