Atmospherically transported elements and deposition in the Southeastern United States: Local or transoceanic?
C. W. Holmes, R. Miller
2004, Conference Paper, Applied Geochemistry
Saharan dust is persistently transported and deposited in ecosystems of the western Atlantic Ocean. This dust is an aggregate of clay and quartz particles cemented with Fe oxides. Samples collected and analyzed from Mali (central Africa), the Azores, the Caribbean and the Eastern United States document the levels of minor...
Analysis of modern and Pleistocene hydrologic exchange between Saginaw Bay (Lake Huron) and the Saginaw Lowlands area
J. R. Hoaglund III, J.J. Kolak, D.T. Long, G.J. Larson
2004, Geological Society of America Bulletin (116) 3-15
Two numerical models, one simulating present groundwater flow conditions and one simulating ice-induced hydraulic loading from the Port Huron ice advance, were used to characterize both modern and Pleistocene groundwater exchange between the Michigan Basin and near-surface water systems of Saginaw Bay (Lake Huron) and the surrounding Saginaw Lowlands area....
Chondrichthyans from the Pennsylvanian (Desmoinesian) Naco Formation of central Arizona
D.K. Elliott, R.B. Irmis, Michael C. Hansen, T.J. Olson
2004, Journal of Vertebrate Paleontology (24) 268-280
Teeth, spines, and dermal denticles of chondrichthyans are reported from the Middle Pennsylvanian (Desmoinesian) Naco Formation of central Arizona. The most common elements are crushing teeth of the cochliodont Deltodus angularis, less common are teeth of D. sublaevis, Venustodus leidyi, Lagarodus angustus, “Cladodus” occidentalis, Petalodus ohioensis, Orodus sp., and Hybodontoidea....
Modelling effects of discharge on habitat quality and dispersal of juvenile humpback chub (Gila cypha) in the Colorado River, Grand Canyon
J. Korman, S.M. Wiele, M. Torizzo
2004, River Research and Applications (20) 379-400
A two-dimensional hydrodynamic model was applied to seven study reaches in the Colorado River within Grand Canyon to examine how operation of Glen Canyon Dam has affected availability of suitable shoreline habitat and dispersal of juvenile humpback chub (Gila cypha). Suitable shoreline habitat typically declined with increasing discharges above 226-425...
Historical channel-bed elevation change as a result of multiple disturbances, Soldier Creek, Kansas
K. E. Juracek
2004, Physical Geography (25) 269-290
Historical information on stream stage/discharge relations from eight U.S. Geological Survey (USGS) streamflow-gaging stations was used to analyze channel-bed elevation change along Soldier Creek, a stream affected by multiple disturbances in northeast Kansas. The analysis provided information on the spatial (location, type, magnitude) and temporal (timing, duration, trend, rate) dimensions...
Reach-scale isotope tracer experiment to quantify denitrification and related processes in a nitrate-rich stream, midcontinent United States
J.K. Böhlke, J. W. Harvey, M.A. Voytek
2004, Limnology and Oceanography (49) 821-838
We conducted an in-stream tracer experiment with Br and 15N-enriched NO3- to determine the rates of denitrification and related processes in a gaining NO3- -rich stream in an agricultural watershed in the upper Mississippi basin in September 2001. We determined reach-averaged rates of N fluxes and reactions from isotopic analyses...
Comparison of litter decomposition in a natural versus coal-slurry pond reclaimed as a wetland
J. Taylor, B.A. Middleton
2004, Land Degradation and Development (15) 439-446
Decomposition is a key function in reclaimed wetlands, and changes in its rate have ramifications for organic-matter accumulation, nutrient cycling, and production. The purpose of this study was to compare leaf litter decomposition rates in coal-slurry ponds vs. natural wetlands on natural floodplain wetlands in Illinois, USA. The rate of...
Potential sources of hydrogel stabilization of Florida Bay lime mud sediments and implications for organic matter preservation
J.W. Louda, J.W. Loitz, A. Melisiotis, W. H. Orem
2004, Journal of Coastal Research (20) 448-463
The fine grained carbonate mud sediments of central Florida Bay are resuspended quite easily. However, this disturbance is usually limited to the surficial ('floc') layer, as the underlying sediments appear to be stabilized by an hydrogelation involving the bulk organic matter. That gelation has occurred within these sediments is suggested...
Mycobacterium-Inducible Nramp in Striped Bass (Morone saxatilis)
E.J. Burge, David T. Gauthier, C. A. Ottinger, P.A. Van Veld
2004, Infection and Immunity (72) 1626-1636
In mammals, the natural resistance-associated macrophage protein 1 gene, Nramp1, plays a major role in resistance to mycobacterial infections. Chesapeake Bay striped bass (Morone saxatilis) is currently experiencing an epizootic of mycobacteriosis that threatens the health of this ecologically and economically important species. In the present study, we characterized an...
An animal location-based habitat suitability model for bighorn sheep and wild horses in Bighorn Canyon National Recreation Area and the Pryor Mountain Wild Horse Range, Montana, and Wyoming
Gary Wockner, Francis J. Singer, Kathryn A. Schoenecker
2004, Report, Bighorn sheep habitat studies, population dynamics, and population modeling in Bighorn Canyon National Recreation Area, Wyoming and Montana, 2000-2003 (Open-File Report 2004-1337)
The purpose of this habitat suitability model is to provide a tool that will help managers and researchers better manage bighorn sheep and wild horses in the Bighorn Canyon National Recreation Area (BICA) and Pryor Mountain Wild Horse Range (PMWHR). A concern in the management of the Pryor Mountain wild...
Bighorn sheep (Ovis canadensis) survivorship and habitat studies in Bighorn Canyon National Recreation Area and surrounding lands, Wyoming and Montana, 2000–2003
Kathryn A. Schoenecker, Francis J. Singer, Kayla A. Grams, James E. Roelle
2004, Report, Bighorn sheep habitat studies, population dynamics, and population modeling in Bighorn Canyon National Recreation Area, Wyoming and Montana, 2000-2003 (Open-File Report 2004-1337)
In the 1850s, bighorn sheep (Ovis canadensis) were numerous and distributed throughout the Bighorn and Pryor Mountains of Montana and Wyoming. After European settlement, bighorn sheep populations declined, and local extinctions occurred in much of their historic range in the western United States. The current bighorn sheep population of Bighorn...
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...
Use of amphibians as indicators of ecosystem restoration success
Kenneth G. Rice, Frank Mazzotti
2004, Fact Sheet 2004-3106
No abstract available at this time...
Nest survival estimation: A review of alternatives to the Mayfield estimator
G. Jehle, A. A. Yackel Adams, J. A. Savidge, S. K. Skagen
2004, The Condor (106) 472-484
Reliable estimates of nest survival are essential for assessing strategies for avian conservation. We review the history of modifications and alternatives for estimating nest survival, with a focus on four techniques: apparent nest success, the Mayfield estimator, the Stanley method, and program MARK. The widely used Mayfield method avoids the...
Unusual behavior by Bison, Bison bison, toward Elk, Cervus elaphus, and wolves, Canis lupus
L.D. Mech, R.T. McIntyre, D.W. Smith
2004, Canadian Field-Naturalist (118) 115-118
Incidents are described of Bison (Bison bison) in Yellowstone National Park mauling and possibly killing a young Elk (Cervus elaphus) calf, chasing wolves (Canis lupus) off Elk they had just killed or were killing, and keeping the wolves away for extended periods. During one of the latter cases, the Bison...
Suspended sediment transport where rivers become estuaries: Sacramento – San Joaquin River Delta, water years 1999-2002
S.A. Wright, D. H. Schoellhamer
2004, Conference Paper, Proceedings of the 2004 CALFED Science Conference
No abstract available....
Transient Analysis of the Source of Water to Wells: Cape Cod, Massachusetts
John P. Masterson, D. A. Walter, D.R. LeBlanc
2004, Ground Water (42) 126-134
A transient flow modeling analysis for potential public-supply wells on western Cape Cod, Massachusetts, demonstrates the difference between transient and steady-state recharge areas can have important implications for wellhead protection. An example of a single pumping well illustrates that commonly, used steady-state time-related capture areas do not represent the recharge...
Fort Collins Science Center: Invasive Species Science
Tom Stohlgren
2004, Fact Sheet 2004-3145
Invasive, non-native species of plants, animals, and disease organisms adversely affect the ecosystems they enter. Like "biological wildfires," they can quickly spread, and they affect nearly all terrestrial and aquatic ecosystems. Invasive species have become the greatest environmental challenge of the 21st century in terms of economic, environmental, and human...
A Complex Systems Model Approach to Quantified Mineral Resource Appraisal
M. E. Gettings, M.W. Bultman, F. S. Fisher
2004, Environmental Management (33) 87-98
For federal and state land management agencies, mineral resource appraisal has evolved from value-based to outcome-based procedures wherein the consequences of resource development are compared with those of other management options. Complex systems modeling is proposed as a general framework in which to build models that can evaluate outcomes. Three...
Bighorn sheep habitat studies, population dynamics, and population modeling in Bighorn Canyon National Recreation Area, Wyoming and Montana, 2000-2003
Francis J. Singer, Kathryn A. Schoenecker
2004, Open-File Report 2004-1337
At the request of National Park Service resource managers, we began a study in 2000 to evaluate causes for the decline of the bighorn sheep (Ovis canadensis) population inhabiting Bighorn Canyon National Recreation Area (BICA), the Pryor Mountain Wild Horse Range, and surrounding state and U.S. Forest Service lands in...
Water year 2004: Western water managers feel the heat
Thomas Pagano, Phil Pasteris, Michael D. Dettinger, Daniel Cayan, Kelly Redmond
2004, Eos, Earth and Space Science News (85) 385-393
This spring, a rare combination of exceptionally warm temperatures and near-record lack of precipitation in the western United States caused a rapid change in hydrologic conditions and an unexpectedly early onset of spring conditions. With much of the western U.S. already in its fifth year of drought, an above-average western snowpack...
Specific conductance and water temperature data for San Francisco Bay, California, for Water Year 2003
P.A. Buchanan
2004, Interagency Ecological Program Newsletter (17) 11-14
This article presents time-series graphs of specific-conductance and water-temperature data collected in San Francisco Bay during water year 2003 (October 1, 2002, through September 30, 2003). Specific-conductance and water-temperature data were recorded at 15-minute intervals at the following US Geological Survey (USGS) locations (Figure 1): • Suisun Bay at Benicia...
National Wildlife Health Center Quarterly Mortality Report
K. A. Converse, R. Sohn, G. McLaughlin
2004, Supplement to the Journal of Wildlife Diseases (40)
Elastic velocities of partially gas-saturated unconsolidated sediments
Myung W. Lee
2004, Marine and Petroleum Geology (21) 641-650
Fluid in sediments significantly affects elastic properties of sediments and gas in the pore space can be identified by a marked reduction of P-wave velocity or a decrease of Poisson's ratio. The elastic properties of gas-saturated sediments can be predicted by the classical Biot-Gassmann theory (BGT). However, parameters for the...
Comparative susceptibility of Atlantic salmon, lake trout and rainbow trout to Myxobolus cerebralis in controlled laboratory exposures
V. S. Blazer, Christine L. Densmore, W. B. Schill, Deborah D. Cartwright, S.J. Page
2004, Diseases of Aquatic Organisms (58) 27-34
The susceptibility of lake trout Salvelinus namaycush, rainbow trout Oncorhynchus mykiss and Atlantic salmon Salmo salar to Myxobolus cerebralis, the causative agent of whirling disease, was compared in controlled laboratory exposures. A total of 450 (225 for each dose) fry for each species were exposed to a low (200 spores...
