Estimating the use of morphometric measurements from museum specimens for sex determination in Mountain Plovers (Charadrius montanus)
W.M. Iko, S.J. Dinsmore, F.L. Knopf
2004, Western North American Naturalist (64) 492-496
The Mountain Plover (Charadrius montanus) is a shorebird species endemic to the dry, terrestrial ecosystems of the Great Plains and southwestern United States. Breeding Bird Survey data suggest that Mountain Plover populations have declined by >60% in the last 30 years. A better understanding of the population dynamics of the...
Fort Collins Science Center: Policy Analysis and Science Assistance
Berton L. Lamb
2004, Fact Sheet 2004-3144
Most resource management decisions involve the integrated use of biological, sociological, and economic information. Combining this information provides a more comprehensive basis for making effective land management and conservation decisions. Toward this end, scientists in the Policy Analysis and Science Assistance Branch (PASA) of the Fort Collins Science Center (FORT)...
Fort Collins Science Center: Aquatic Systems and Technology Applications
Dave Hamilton
2004, Fact Sheet 2004-3149
Land and water management agencies are responsible for restoring and conserving our nation's natural resources. However, they face increasing, often competing demands for those resources, which can result in alteration or loss of critical riverine, riparian, wetland, and terrestrial habitats. Land and resource managers may be in federal, state, or...
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...
Comparison of geodetic and glaciological mass-balance techniques, Gulkana Glacier, Alaska, U.S.A
L.H. Cox, R.S. March
2004, Journal of Glaciology (50) 363-370
The net mass balance on Gulkana Glacier, Alaska, U.S.A., has been measured since 1966 by the glaciological method, in which seasonal balances are measured at three index sites and extrapolated over large areas of the glacier. Systematic errors can accumulate linearly with time in this method. Therefore, the geodetic balance,...
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...
Extracting transient Rayleigh wave and its application in detecting quality of highway roadbed
J. Liu, J. Xia, Y. Luo, X. Li, S. Xu
Chen C.Xia J., editor(s)
2004, Conference Paper, Progress in Environmental and Engineering Geophysics: Proceedings of the International Conference on Environmental and Engineering Geophysics, ICEEG 2004
This paper first explains the tau-p mapping method of extracting Rayleigh waves (LR waves) from field shot gathers. It also explains a mathematical model of physical character parameters of quality of high-grade roads. This paper then discusses an algorithm of computing dispersion curves using adjacent channels. Shear velocity and physical...
U.S. land cover and land use change—1973-2000
D.E. Napton, Thomas R. Loveland
B. Warf, D. Janelle, K. Hansen, editor(s)
2004, Book chapter, WorldMinds—geographical perspectives on 100 problems
No abstract available....
Geophysical data reveal the crustal structure of the Alaska Range orogen within the aftershock zone of the Mw 7.9 Denali fault earthquake
M. A. Fisher, N. A. Ratchkovski, W. J. Nokleberg, L. Pellerin, J.M.G. Glen
2004, Bulletin of the Seismological Society of America (94) S107-S131
Geophysical information, including deep-crustal seismic reflection, magnetotelluric (MT), gravity, and magnetic data, cross the aftershock zone of the 3 November 2002 Mw 7.9 Denali fault earthquake. These data and aftershock seismicity, jointly interpreted, reveal the crustal structure of the right-lateral-slip Denali fault and the eastern Alaska Range orogen, as well...
Three-dimensional fish tracking to evaluate the removable spillway weir at Lower Granite Dam during 2003, Annual report 2003
K.M Cash, T.W Hatton, E.C. Jones, R.J. Magie, N.S. Adams, D.W. Rondorf
2004, Report
Abstract not available ...
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...
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...
Effects of Ichthyophonus on survival and reproductive success of Yukon River Chinook salmon. Final report for study 01-200
R. Kocan, P. Hershberger, J. Winton
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 ...
Identification of larval Pacific lampreys (Lampetra tridentata), river lampreys (L. ayresi), and western brook lampreys (L. richardsoni) and thermal requirements of early life history stages of lampreys
M.H. Meeuwig, J.M. Bayer, J.G. Seelye, R.A. Reiche
2004, Report
No abstract available ...
Response of desert biological soil crusts to alterations in precipitation frequency
J. Belnap, S. L. Phillips, M. E. Miller
2004, Oecologia (141) 306-316
Biological soil crusts, a community of cyanobacteria, lichens, and mosses that live on the soil surface, occur in deserts throughout the world. They are a critical component of desert ecosystems, as they are important contributors to soil fertility and stability. Future climate scenarios predict alteration of the timing and amount...
Facilitating fish passage at ultra low head dams: An alternative to dam removal
M. Odeh
2004, Conference Paper, Bridging the Gap: Meeting the World's Water and Environmental Resources Challenges - Proceedings of the World Water and Environmental Resources Congress 2001
Ecosystem sustainability and returning the biological integrity to rivers continue to change the landscape of fish passage technology. Installing a conventional fishways has a limited degree of success in accommodating fish passage needs. Recently, the option of total dam removal has been gaining momentum among resource managers, conservationists, and even...
Uranium adsorption on weathered schist - Intercomparison of modeling approaches
T.E. Payne, J.A. Davis, M. Ochs, M. Olin, C.J. Tweed
2004, Radiochimica Acta (92) 651-661
Experimental data for uranium adsorption on a complex weathered rock were simulated by twelve modelling teams from eight countries using surface complexation (SC) models. This intercomparison was part of an international project to evaluate the present capabilities and limitations of SC models in representing sorption by geologic materials. The models...
WTAQ - A computer program for aquifer-test analysis of confined and unconfined aquifers
P. M. Barlow, A.F. Moench
2004, Conference Paper, Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships
Computer program WTAQ was developed to implement a Laplace-transform analytical solution for axial-symmetric flow to a partially penetrating, finite-diameter well in a homogeneous and anisotropic unconfined (water-table) aquifer. The solution accounts for wellbore storage and skin effects at the pumped well, delayed response at an observation well, and delayed or...
Application of near real-time radial semblance to locate the shallow magmatic conduit at Kilauea Volcano, Hawaii
P. Dawson, D. Whilldin, B. Chouet
2004, Geophysical Research Letters (31)
Radial Semblance is applied to broadband seismic network data to provide source locations of Very-Long-Period (VLP) seismic energy in near real time. With an efficient algorithm and adequate network coverage, accurate source locations of VLP energy are derived to quickly locate the shallow magmatic conduit system at Kilauea Volcano, Hawaii....
Modeling the Death Valley regional ground-water flow system
F. A. D’Agnese, C.C. Faunt, M. C. Hill
2004, Conference Paper, Joint Conference on Water Resource Engineering and Water Resources Planning and Management 2000: Building Partnerships
The development of a regional ground-water flow model of the Death Valley region in the southwestern United States is discussed in the context of the fourteen guidelines of Hill. This application of the guidelines demonstrates how they may be used for model calibration and evaluation, and to direct further model...
Nitrite toxicity of Litopenaeus vannamei in water containing low concentrations of sea salt or mixed salts
A. Sowers, S.P. Young, J. Jeffery Isely, C.L. Browdy, J.R. Tomasso Jr.
2004, Journal of the World Aquaculture Society (35) 445-451
The uptake, depuration and toxicity of environmental nitrite was characterized in Litopenaeus vannamei exposed in water containing low concentrations of artificial sea salt or mixed salts. In 2 g/L artificial sea salts, nitrite was concentrated in the hemolymph in a dose-dependent and rapid manner (steady-state in about 2 d). When...
Origin of placer laurite from Borneo: Se and As contents, and S isotopic compositions
K.H. Hattori, L.J. Cabri, B. Johanson, M. L. Zientek
2004, Mineralogical Magazine (68) 353-368
We examined grains of the platinum-group mineral, laurite (RuS2), from the type locality, Pontyn River, Tanah Laut, Borneo, and from the Tambanio River, southeast Borneo. The grains show a variety of morphologies, including euhedral grains with conchoidal fractures and pits, and spherical grains with no crystal faces, probably because of...
Effects of multiple routes of cadmium exposure on the hibernation success of the American toad (Bufo americanus)
S.M. James, E. E. Little, R. D. Semlitsch
2004, Archives of Environmental Contamination and Toxicology (46) 518-527
The effects of multiple routes of cadmium exposure on juvenile American toads (Bufo americanus) were evaluated using environmentally relevant concentrations. During or after exposure, toads were individually hibernated for 172 days at approximately 4°C. The following experiments were conducted: (1) dermal exposure (hibernation in soil contaminated with up to 120...
Predicting maternal body burdens of organochlorine pesticides from eggs and evidence of maternal transfer in Alligator mississippiensis
R.H. Rauschenberger, M. S. Sepulveda, J.J. Wiebe, N.J. Szabo, T. S. Gross
2004, Environmental Toxicology and Chemistry (23) 2906-2915
Few data exist regarding maternal-embryonal transfer of organochlorine pesticides (OCPs) in reptiles. The objective of the present study was to evaluate maternal transfer of OCPs in American alligators (Alligator mississippiensis) from low-, intermediate-, and high-OCP-exposure sites. Overall, total OCP burdens ranged from less than 0.8 ppb in blood to more...
