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Page 2455, results 61351 - 61375

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Attitudes and perceptions about prairie dogs
Berton Lee Lamb, Richard P. Reading, William F. Andelt
John L. Hoogland, editor(s)
2006, Book chapter, Conservation of the black-tailed prairie dog: Saving North America's western grasslands
We sometimes get the impression that all ranchers and farmers of the western United States hate prairie dogs, and that people everywhere else love them. This generality contains elements of truth, but better documentation of attitudes and perceptions is paramount for good conservation. In this chapter we examine attitudes and...
Balancing predation and egg harvest in a colonial seabird: A simulation model
Stephani Zador, John F. Piatt, A. E. Punt
2006, Ecological Modelling (195) 318-326
We developed an individual-based model to study the effects of different regimes of harvesting eggs and natural predation on reproductive success in a colony of the glaucous-winged gull (Larus glaucescens) in Glacier Bay National Park, Alaska. The model incorporates the sequence of egg laying, relaying, and incubation to hatching for...
Population momentum across vertebrate life histories
D. N. Koons, J.B. Grand, J.M. Arnold
2006, Ecological Modelling (197) 418-430
Population abundance is critically important in conservation, management, and demographic theory. Thus, to better understand how perturbations to the life history affect long-term population size, we examined population momentum for four vertebrate classes with different life history strategies. In a series of demographic experiments we show that population momentum generally...
Fire ecology of the Sierra Nevada
J. W. van Wagtendonk
George Wuerthner, editor(s)
2006, Book chapter, Fire - Restoring fire to the land - Fire ecology and forest health
No abstract available....
Evolution of plant adaptations
Jon E. Keeley
J. Fites-Kaufman, N. Sugihari, J. van Wangtendonk, editor(s)
2006, Book chapter, Fire Ecology of California Ecosystems.
No abstract available at this time...
The allometric relationship between resting metabolic rate and body mass in wild waterfowl (Anatidae) and an application to estimation of winter habitat requirements
M. R. Miller, J. McA Eadie
2006, Condor (108) 166-177
We examined the allometric relationship between resting metabolic rate (RMR; kJ day-1) and body mass (kg) in wild waterfowl (Anatidae) by regressing RMR on body mass using species means from data obtained from published literature (18 sources, 54 measurements, 24 species; all data from captive birds). There was no significant...
Development of partial rock veneers by root throw in a subalpine setting
W. R. Osterkamp, T.J. Toy, M.T. Lenart
2006, Earth Surface Processes and Landforms (31) 1-14
Rock veneers stabilize hillslope surfaces, occur especially in areas of immature soil, and form through a variety of process sets that includes root throw. Near Westcliffe, Colorado, USA, data were collected from a 20 ?? 500 m transect on the east slope of the Sangre de Cristo Mountains. Ages of...
Evaluation of the factors controlling the time-dependent inactivation rate coefficients of bacteriophage MS2 and PRD1
R. Anders, C.V. Chrysikopoulos
2006, Environmental Science & Technology (40) 3237-3242
Static and dynamic batch experiments were conducted to study the effects of temperature and the presence of sand on the inactivation of bacteriophage MS2 and PRD1. The experimental data suggested that the inactivation process can be satisfactorily represented by a pseudo-first-order expression with time-dependent rate coefficients. The time-dependent rate coefficients...
Flow resistance dynamics in step‐pool stream channels: 1. Large woody debris and controls on total resistance
Andrew C. Wilcox, Ellen E. Wohl
2006, Water Resources Research (42)
Flow resistance dynamics in step‐pool channels were investigated through physical modeling using a laboratory flume. Variables contributing to flow resistance in step‐pool channels were manipulated in order to measure the effects of various large woody debris (LWD) configurations, steps, grains, discharge, and slope on total flow resistance. This entailed nearly...
High REE and Y concentrations in Co-Cu-Au ores of the Blackbird district, Idaho
J. F. Slack
2006, Economic Geology (101) 275-280
Analysis of 11 samples of strata-bound Co-Cu-Au ore from the Blackbird district in Idaho shows previously unknown high concentrations of rare earth elements (REE) and Y, averaging 0.53 wt percent ???REE + Y oxides. Scanning electron microscopy indicates REE and Y residence in monazite, xenotime, and allanite that form complex...
Estimating recharge rates with analytic element models and parameter estimation
W. R. Dripps, R. J. Hunt, Marilyn P. Anderson
2006, Ground Water (44) 47-55
Quantifying the spatial and temporal distribution of recharge is usually a prerequisite for effective ground water flow modeling. In this study, an analytic element (AE) code (GFLOW) was used with a nonlinear parameter estimation code (UCODE) to quantify the spatial and temporal distribution of recharge using measured base flows as...
Chapter 13 Petrogenesis of the Campanian Ignimbrite: Implications for crystal-melt separation and open-system processes from major and trace elements and Th isotopic data
W.A. Bohrson, F. J. Spera, S. J. Fowler, H. E. Belkin, B. de Vivo, G. Rolandi
2006, Developments in Volcanology (9) 249-288
The Campanian Ignimbrite is a large-volume trachytic to phonolitic ignimbrite that was deposited at ≈39.3 ka and represents one of a number of highly explosive volcanic events that have occurred in the region near Naples, Italy. Thermodynamic modeling using the MELTS algorithm reveals that major element variations are dominated by...
Rainfall characteristics for shallow landsliding in Seattle, Washington, USA
J. W. Godt, R.L. Baum, A.F. Chleborad
2006, Earth Surface Processes and Landforms (31) 97-110
Shallow landsliding in the Seattle, Washington, area, has caused the occasional loss of human life and millions of dollars in damage to property. The effective management of the hazzard requires an understanding of the rainfall conditions that result in landslides. We present an empirical approach to quantify the antecedent moisture...
Geologic, hydrologic, and geochemical interpretations of mineral deposits as analogs for understanding transport of environmental contaminants
R. B. Wanty, B. R. Berger
2006, Journal of Geochemical Exploration (88) 162-165
Base- and precious-metal mineral deposits comprise anomalous concentrations of metals and associated elements, which may be useful subjects for study as analogs for migration of environmental contaminants. In the geologic past, hydrothermal mineral deposits formed at the intersection of favorable geologic, hydrologic and geochemical gradients. In the present, weathering of...
The effect of chronic chromium exposure on the health of Chinook salmon (Oncorhynchus tshawytscha)
A.M. Farag, T. May, G.D. Marty, M. Easton, D.D. Harper, E. E. Little, L. Cleveland
2006, Aquatic Toxicology (76) 246-257
This study was designed to determine fish health impairment of Chinook salmon (Oncorhynchus tshawytscha) exposed to chromium. Juvenile Chinook salmon were exposed to aqueous chromium concentrations (0–266 μg l−1) that have been documented in porewater from bottom sediments and in well waters near salmon spawning areas in the Columbia River in the...
Peak discharge of a Pleistocene lava-dam outburst flood in Grand Canyon, Arizona, USA
C.R. Fenton, R. H. Webb, T.E. Cerling
2006, Quaternary Research (65) 324-335
The failure of a lava dam 165,000 yr ago produced the largest known flood on the Colorado River in Grand Canyon. The Hyaloclastite Dam was up to 366 m high, and geochemical evidence linked this structure to outburst-flood deposits that occurred for 32 km downstream. Using the Hyaloclastite outburst-flood deposits...
Trace element geochemistry and surface water chemistry of the Bon Air coal, Franklin County, Cumberland Plateau, southeast Tennessee
S.A. Shaver, J.C. Hower, C.F. Eble, E.D. McLamb, K. Kuers
2006, International Journal of Coal Geology (67) 47-78
Mean contents of trace elements and ash in channel, bench-column, and dump samples of the abandoned Bon Air coal (Lower Pennsylvanian) in Franklin County, Tennessee are similar to Appalachian COALQUAL mean values, but are slightly lower for As, Fe, Hg, Mn, Na, Th, and U, and slightly higher for ash,...