Crystallographic controls on the frictional behavior of dry and water-saturated sheet structure minerals
Diane E. Moore, D.A. Lockner
2004, Journal of Geophysical Research B: Solid Earth (109)
We compare the frictional strengths of 17 sheet structure mineral powders, measured under dry and water-saturated conditions, to identify the factors that cause many of them to be relatively weak. The dry coefficient of friction μ ranges upward from 0.2 for graphite, leveling off at 0.8 for margarite, clintonite, gibbsite,...
Sources of osmium to the modern oceans: New evidence from the 190Pt-186Os system
D.K. McDaniel, R.J. Walker, S. R. Hemming, M.F. Horan, H. Becker, R. I. Grauch
2004, Geochimica et Cosmochimica Acta (68) 1243-1252
High precision Os isotope analysis of young marine manganese nodules indicate that whereas the composition of modern seawater is radiogenic with respect to 187Os/188Os, it has 186Os/188Os that is within uncertainty of the chondritic value. Marine Mn nodule compositions thus indicate that the average continental source of Os to modern...
Habitat restoration across large areas: Assessing wildlife responses in the Clearwater basin, Idaho
L.K. Scanvara, G. Servheen, W. Melquist, D. Davis, J. M. Scott
2004, Western Journal of Applied Forestry (19) 123-132
Over the past century, fire suppression and prevention have altered disturbance regimes across the Pacific Northwest, resulting in a significant divergence of historical and current conditions in forested habitats. To address this continuing trend in habitat changes and begin restoring historical patterns of disturbance, the Clearwater Basin Elk Habitat Initiative...
Nitrification in the Upper Mississippi River: Patterns, controls, and contribution to the NO3- budget
E.A. Strauss, W. B. Richardson, L.A. Bartsch, J.C. Cavanaugh, D.A. Bruesewitz, H. Imker, J.A. Heinz, D.M. Soballe
2004, Journal of the North American Benthological Society (23) 1-14
We measured nitrification rates in sediment samples collected from a variety of aquatic habitats in Navigation Pool 8 of the Upper Mississippi River (UMR) 7 times between May 2000 and October 2001. We also conducted nutrient-enrichment experiments and analyzed vertical profiles of sediment to determine factors regulating nitrification. Nitrification rates...
Intestinal helminths in mourning doves (Zenaida macroura) from Arizona, Pennsylvania, South Carolina, and Tennessee, U.S.A.
K. A. Lee, J. C. Franson, J. M. Kinsella, T. Hollmen, S. P. Hansen, A. Hollmen
2004, Comparative Parasitology (71) 81-85
We examined 115 hunter-killed mourning doves (Zenaida macroura) from 4 states (Arizona, Pennsylvania, South Carolina, and Tennessee, U.S.A.) in 1998 and 1999 to investigate geographical variation in the prevalence and intensity of intestinal helminth infections. Four intestinal helminth species were identified: Killigrewia delafondi, Ornithostrongylus crami, Ascaridia columbae, and Capillaria...
Autumn migration and wintering areas of Peregrine Falcons Falco peregrinus nesting on the Kola Peninsula, northern Russia
S.A. Ganusevich, T.L. Maechtle, W.S. Seegar, M.A. Yates, M.J. McGrady, M. Fuller, L. Schueck, J. Dayton, Charles J. Henny
2004, Ibis (146) 291-297
Four female Peregrine Falcons Falco peregrinus breeding on the Kola Peninsula, Russia, were fitted with satellite-received transmitters in 1994. Their breeding home ranges averaged 1175 (sd = ±714) km2, and overlapped considerably. All left their breeding grounds in September and migrated generally south-west along the Baltic Sea. The mean travel rate for three...
LIDAR optical rugosity of coral reefs in Biscayne National Park, Florida
J. C. Brock, C. W. Wright, T.D. Clayton, A. Nayegandhi
2004, Coral Reefs (23) 48-59
The NASA Experimental Advanced Airborne Research Lidar (EAARL), a temporal waveform-resolving, airborne, green wavelength LIDAR (light detection and ranging), is designed to measure the submeter-scale topography of shallow reef substrates. Topographic variability is a prime component of habitat complexity, an ecological factor that both expresses and controls the abundance and...
Seismographs, sensors, and satellites: Better technology for safer communities
C.G. Groat
2004, Technology in Society (26) 169-179
In the past 25 years, our ability to measure, monitor, and model the processes that lead to natural disasters has increased dramatically. Equally important has been the improvement in our technological capability to communicate information about hazards to those whose lives may be affected. These innovations in tracking and communicating...
Surface deformations as indicators of deep ebullition fluxes in a large northern peatland
P.H. Glaser, J. P. Chanton, Peter Morin, D.O. Rosenberry, D. I. Siegel, O. Ruud, L.I. Chasar, A.S. Reeve
2004, Global Biogeochemical Cycles (18)
Peatlands deform elastically during precipitation cycles by small (±3 cm) oscillations in surface elevation. In contrast, we used a Global Positioning System network to measure larger oscillations that exceeded 20 cm over periods of 4-12 hours during two seasonal droughts at a bog and fen site in northern Minnesota. The...
Dissolved organic carbon and disinfection by-product precursor release from managed peat soils
J.A. Fleck, D.A. Bossio, R. Fujii
2004, Journal of Environmental Quality (33) 465-475
A wetland restoration demonstration project examined the effects of a permanently flooded wetland on subsidence of peat soils. The project, started in 1997, was done on Twitchell Island, in the Sacramento-San Joaquin Delta of California. Conversion of agricultural land to a wetland has changed many of the biogeochemical processes controlling...
California earthquake history
T. Toppozada, D. Branum
2004, Annals of Geophysics (47) 509-522
This paper presents an overview of the advancement in our knowledge of California's earthquake history since ??? 1800, and especially during the last 30 years. We first review the basic statewide research on earthquake occurrences that was published from 1928 through 2002, to show how the current catalogs and their...
Sustaining healthy freshwater ecosystems
Jill Baron, N.L. Poff
2004, Water Resources Update (127) 52-58
Functionally intact and biologically complex freshwater ecosystems provide many economically valuable commodities and services to society. The services supplied by freshwater ecosystems include flood control, transportation, recreation, purification of human and industrial wastes, habitat for plants and animals, and production of fish and other foods and marketable goods. These human...
Sensitivity to acidification of subalpine ponds and lakes in north-western Colorado
K. Campbell, E. Muths, J.T. Turk, P.S. Corn
2004, Hydrological Processes (18) 2817-2834
Although acidifying deposition in western North America is lower than in many parts of the world, many high-elevation ecosystems there are extremely sensitive to acidification. Previous studies determined that the Mount Zirkel Wilderness Area (MZWA) has the most acidic snowpack and aquatic ecosystems that are among the most sensitive in...
Collared peccary range expansion in northwestern New Mexico
S. Albert, C.A. Ramotnik, C.G. Schmitt
2004, Southwestern Naturalist (49) 524-528
We report new records of collared peccary (Pecari tajacu) in New Mexico that document its continued northward expansion in the United States, in general, and in northwestern New Mexico, in particular. These records might represent the northernmost extent of its range in the Southwest. Collared peccaries in New Mexico typically...
Predicting the thermal effects of dam removal on the Klamath River
J.M. Bartholow, S.G. Campbell, M. Flug
2004, Environmental Management (34) 856-874
The Klamath River once supported large runs of anadromous salmonids. Water temperature associated with multiple mainstem hydropower facilities might be one of many factors responsible for depressing Klamath salmon stocks. We combined a water quantity model and a water quality model to predict how removing the series of dams below...
Multi-scale and nested-intensity sampling techniques for archaeological survey
O. Burger, L.C. Todd, P. Burnett, T.J. Stohlgren, D. Stephens
2004, Journal of Field Archaeology (29) 409-423
This paper discusses sampling techniques for archaeological survey that are directed toward evaluating the properties of surface artifact distributions. The sampling techniques we experimented with consist of a multi-scale sampling plot developed in plant ecology and the use of a nested-intensity survey design. We present results from the initial application...
Annual Report for 2003 Wild Horse Research and Field Activities
Jason Ransom, Francis J. Singer, Linda Zeigenfuss
2004, Open-File Report 2004-1264
As stated in the Wild Horse Fertility Control Field Trial Plan, the Bureau of Land Management (BLM) has an immediate need for a safe, effective contraceptive agent to assist in the management of the large number of wild horses on western rangelands. The BLM and the U.S. Geological Survey-Biological Resources...
Numerical simulations of large earthquakes: Dynamic rupture propagation on heterogeneous faults
R.A. Harris
2004, Pure and Applied Geophysics (161) 2171-2181
Our current conceptions of earthquake rupture dynamics, especially for large earthquakes, require knowledge of the geometry of the faults involved in the rupture, the material properties of the rocks surrounding the faults, the initial state of stress on the faults, and a constitutive formulation that determines when the faults can...
Preventing, controlling, and managing alien species introduction for the health of aquatic and marine ecosystems
C.I. Short, S.K. Gross, D. Wilkinson
2004, American Fisheries Society Symposium (2004) 109-125
The introduction and spread of invasive species is an emerging global problem. As economic and ecological impacts continue to grow, there will be an increasing need to develop innovative solutions and global partnerships to combat the increasing rate of invasions and their accompanying impacts. Threats to sustainable fisheries in North...
Dynamic rupture modeling of the transition from thrust to strike-slip motion in the 2002 Denali fault earthquake, Alaska
Brad T. Aagaard, G. Anderson, K.W. Hudnut
2004, Bulletin of the Seismological Society of America (94) S190-S201
We use three-dimensional dynamic (spontaneous) rupture models to investigate the nearly simultaneous ruptures of the Susitna Glacier thrust fault and the Denali strike-slip fault. With the 1957 Mw 8.3 Gobi-Altay, Mongolia, earthquake as the only other well-documented case of significant, nearly simultaneous rupture of both thrust and strike-slip faults, this...
The microbial arsenic cycle in Mono Lake, California
Ronald S. Oremland, John F. Stolz, James T. Hollibaugh
2004, FEMS Microbiology Ecology (48) 15-27
Significant concentrations of dissolved inorganic arsenic can be found in the waters of a number of lakes located in the western USA and in other water bodies around the world. These lakes are often situated in arid, volcanic terrain. The highest concentrations of arsenic occur in hypersaline, closed basin soda...
Report of the technical review panel - compatibility of Coleman National Fish Hatchery operations and restoration of anadromous salmonids in Battle Creek
C. Busack, D. Hankin, R.P. Hedrick, J.A. Lichatowich, R. Reisenbichler
2004, Report
No abstract available ...
Information on habitat use of larval Ash Meadows speckled dace
R.R McShane, K.M. Swaim, G.G. Scoppettone
2004, Report
No abstract available ...
Xenobiotic impact on Arctic char: Nutritional modulation and physiological consequences
A.G. Maule
2004, Report
No abstract available ...
Status of Ash Meadows speckled dace in Bradford Springs
T. Leavy, R.R McShane, K.M. Swaim, G.G. Scoppettone
2004, Report
No abstract available ...
