Evaluation of evidence supporting the effectiveness of desert tortoise recovery actions
William I. Boarman, William B. Kristan
2006, Scientific Investigations Report 2006-5143
As a federally threatened species, the desert tortoise's (Gopherus agassizii) recovery is required under the Endangered Species Act (ESA). According to the criteria established by the Desert Tortoise Recovery Plan (U.S. Fish and Wildlife Service 1994) for delisting the tortoise from ESA protection, the species as a whole will be considered...
Proximity to crops and residential to agricultural herbicides in Iowa
M.H. Ward, J. Lubin, J. Giglierano, J.S. Colt, C. Wolter, N. Bekiroglu, D. Camann, P. Hartge, J.R. Nuckols
2006, Environmental Health Perspectives (114) 893-897
Rural residents can be exposed to agricultural pesticides through the proximity of their homes to crop fields. Previously, we developed a method to create historical crop maps using a geographic information system. The aim of the present study was to determine whether crop maps are useful for predicting levels of...
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]...
Alternative barging strategies to improve survival of transported juvenile salmonids
G.A. McMichael, J.A. Vucelick, B. Ryan, L. Gilbreath, R.L. McComas, Styles Smith, M. Carper, D. Elliot, T. Murray, L. Applegate, C. McKibben
2006, Report
No abstract available ...
Extreme plasticity in thermoregulatory behaviors of free-ranging black-tailed prairie dogs
E.M. Lehmer, L.T. Savage, M.F. Antolin, E. Biggins
2006, Physiological and Biochemical Zoology (79) 454-467
In the natural environment, hibernating sciurids generally remain dormant during winter and enter numerous deep torpor bouts from the time of first immergence in fall until emergence in spring. In contrast, black-tailed prairie dogs (Cynomys ludovicianus) remain active throughout winter but periodically enter short and shallow bouts of torpor. While...
Trends in the nutrient enrichment of U.S. rivers during the late 20th century and their relation to changes in probable stream trophic conditions
R. B. Alexander, R. A. Smith
2006, Conference Paper, Limnology and Oceanography
We estimated trends in concentrations of total phosphorus (TP) and total nitrogen (TN) and the related change in the probabilities of trophic conditions from 1975 to 1994 at 250 nationally representative riverine monitoring locations in the U.S. with drainage areas larger than about 1,000 km2. Statistically significant (p < 0.05)...
Mercury in ground water, septage, leach-field effluent, and soils in residential areas, New Jersey coastal plain
J. L. Barringer, Zoltan Szabo, D. Schneider, W.D. Atkinson, R.A. Gallagher
2006, Science of the Total Environment (361) 144-162
Water samples were collected from domestic wells at an unsewered residential area in Gloucester County, New Jersey where mercury (Hg) concentrations in well water were known to exceed the USEPA maximum contaminant level (MCL) of 2000 ng/L. This residential area (the CSL site) is representative of more than 70 such...
Reducing risk in exploration under cover
Donald A. Singer, Ryoichi Kouda
2006, Conference Paper, Proceedings of 9th International Symposium on Mineral Exploration (ISME IX): Toward new frontiers for resource exploration and sustainable development
No abstract available....
Evidence of regional subsidence and associated interior wetland loss induced by hydrocarbon production, Gulf Coast region, USA
R.A. Morton, J.C. Bernier, J.A. Barras
2006, Environmental Geology (50) 261-274
Analysis of remote images, elevation surveys, stratigraphic cross-sections, and hydrocarbon production data demonstrates that extensive areas of wetland loss in the northern Gulf Coast region of the United States were associated with large-volume fluid production from mature petroleum fields. Interior wetland losses at many sites in coastal Louisiana and Texas...
The quest for a safe and effective canine distemper virus vaccine for black-footed ferrets
Jeffrey Wimsatt, Dean E. Biggins, Elizabeth S. Williams, Victor M. Becerra
2006, Conference Paper, Recovery of the black-footed ferret: Progress and continuing challenges- Proceedings of the Symposium on the Status of the Black-footed Ferret and Its Habitat, Fort Collins, Colorado, January 28-29, 2004 (Scientific Investigations Report 2005-5293)
Canine distemper virus (CDV) causes a systemic disease that is highly virulent to mustelids and other carnivore (Order Carnivora) species and is found worldwide. Endemic canine distemper in wild and domestic carnivores in the United States has made reintroduction of endangered black-footed ferrets (Mustela nigripes) difficult in the absence of...
Geology-based planning and the aggregate industry - Perspectives from opposite sides of the globe
A.W. Stephens, W. H. Langer
2006, Mining Engineering (58) 63-68
In Australia and in the United States, encroachment by conflicting land uses, zoning restrictions and the "not-in-my-backyard" syndrome make it increasingly difficult to access high-quality aggregate resources located near their market areas. Attempts by government agencies in the United States to protect aggregate resources for future development have met with...
Conceptual ecological model for management of breeding grassland birds in the Mid-Atlantic Region
Bruce G. Peterjohn
2006, Natural Resource Report NPS/NER/NRR--2006/005
The status of grassland birds has become an increasingly important conservation issue. These species exhibit the most consistent population declines of any group of North American birds during the past 40 years. Anecdotal evidence suggests these declines have been occurring for nearly a century (Peterjohn and Sauer 1999). While the...
The quest for the perfect gravity anomaly: Part 1 - New calculation standards
X. Li, T.G. Hildenbrand, W. J. Hinze, Gordon R. Keller, D. Ravat, M. Webring
2006, SEG Technical Program Expanded Abstracts (25) 859-863
The North American gravity database together with databases from Canada, Mexico, and the United States are being revised to improve their coverage, versatility, and accuracy. An important part of this effort is revision of procedures and standards for calculating gravity anomalies taking into account our enhanced computational power, modern satellite-based...
Modeling decadal timescale interactions between surface water and ground water in the central Everglades, Florida, USA
J. W. Harvey, J.T. Newlin, S.L. Krupa
2006, Journal of Hydrology (320) 400-420
Surface-water and ground-water flow are coupled in the central Everglades, although the remoteness of this system has hindered many previous attempts to quantify interactions between surface water and ground water. We modeled flow through a 43,000 ha basin in the central Everglades called Water Conservation Area 2A. The purpose of...
Facies architecture and paleohydrology of a synrift succession in the Early Cretaceous Choyr Basin, southeastern Mongolia
M. Ito, M. Matsukawa, T. Saito, D. J. Nichols
2006, Cretaceous Research (27) 226-240
The Choyr Basin is one of several Early Cretaceous rift basins in southwestern Mongolia that developed in specific regions between north-south trending fold-and-thrust belts. The eastern margin of the basin is defined by high-angle normal and/or strike-slip faults that trend north-to-south and northeast-to-southwest and by the overall geometry of the...
Additive effects of vertebrate predators on insects in a Puerto Rican coffee plantation
R.R. Borkhataria, J.A. Collazo, Martha J. Groom
2006, Ecological Applications (16) 696-703
A variety of studies have established the value of shaded coffee plantations as habitat for birds. While the value of birds as biological controls in coffee has received some attention, the interactions between birds and other predators of insects have not been tested. We used exclosures to examine the effects...
Post-Eocene igneous and tectonic effects of spreading center subduction under southeast Alaska: Far-field effects of early Tertiary ridge subduction in Alaska
2006, Conference Paper, Proceedings of Conference on BackBone of the Americas - Patagonia to Alaska
No abstract available. ...
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...
Improving data analysis in herpetology: Using Akaike's information criterion (AIC) to assess the strength of biological hypotheses
M. J. Mazerolle
2006, Amphibia-Reptilia (27) 169-180
In ecology, researchers frequently use observational studies to explain a given pattern, such as the number of individuals in a habitat patch, with a large number of explanatory (i.e., independent) variables. To elucidate such relationships, ecologists have long relied on hypothesis testing to include or exclude variables in regression models,...
Migration of the Pee Dee River system inferred from ancestral paleochannels underlying the South Carolina Grand Strand and Long Bay inner shelf
W. E. Baldwin, R.A. Morton, T.R. Putney, M.P. Katuna, M.S. Harris, P. T. Gayes, N. W. Driscoll, J. F. Denny, W. C. Schwab
2006, Geological Society of America Bulletin (118) 533-549
Several generations of the ancestral Pee Dee River system have been mapped beneath the South Carolina Grand Strand coastline and adjacent Long Bay inner shelf. Deep boreholes onshore and high-resolution seismic-reflection data offshore allow for reconstruction of these paleochannels, which formed during glacial lowstands, when the Pee Dee River system...
The contingent behavior of charter fishing participants on the Chesapeake Bay: Welfare estimates associated with water quality improvements
P.J. Poor, M. Breece
2006, Journal of Environmental Planning and Management (49) 265-278
Water quality in the Chesapeake Bay has deteriorated over recent years. Historically, fishing has contributed to the region's local economy in terms of commercial and recreational harvests. A contingent behavior model is used to estimate welfare measures for charter fishing participants with regard to a hypothetical improvement in water quality....
Influence of a dam on fine-sediment storage in a canyon river
J.E. Hazel Jr., D.J. Topping, J. C. Schmidt, M. Kaplinski
2006, Journal of Geophysical Research F: Earth Surface (111)
Glen Canyon Dam has caused a fundamental change in the distribution of fine sediment storage in the 99-km reach of the Colorado River in Marble Canyon, Grand Canyon National Park, Arizona. The two major storage sites for fine sediment (i.e., sand and finer material) in this canyon river are lateral...
Timing of Cenozoic volcanism and Basin and Range extension in northwestern Nevada: New constraints from the northern Pine Forest Range
J.P. Colgan, T.A. Dumitru, M. McWilliams, E. L. Miller
2006, Geological Society of America Bulletin (118) 126-139
Eocene-middle Miocene volcanic rocks in the northern Pine Forest Range, Nevada, are ideally situated for reconstructing the timing and style of volcanism and extensional faulting in the northwesternmost part of the Basin and Range province. A conformable sequence of Cenozoic volcanic and sedimentary strata in the northern Pine Forest Range...
Quiescent deformation of the Aniakchak Caldera, Alaska mapped by InSAR
Oh-Ig Kwoun, Zhong Lu, Christina A. Neal, Charles W. Wicks Jr.
2006, Geology (34) 5-8
The 10-km-wide caldera of the historically active Aniakchak volcano, Alaska, subsides ∼13 mm/yr, based on data from 19 European Remote Sensing Satellite (ERS-1 and ERS-2) interferometric synthetic aperture radar (InSAR) images from 1992 through 2002. The pattern of subsidence does not reflect the distribution of pyroclastic deposits from the last...
Habitat preferences and intraspecific competition in black-footed ferrets
Dean E. Biggins, Jerry L. Godbey, Marc R. Matchett, Travis M. Livieri
2006, Conference Paper, Recovery of the black-footed ferret: Progress and continuing challenges- Proceedings of the Symposium on the Status of the Black-footed Ferret and Its Habitat, Fort Collins, Colorado, January 28-29, 2004 (Scientific Investigations Report 2005-5293)
We used radio-telemetry data (28,560 positional fixes) collected on 153 black-footed ferrets (Mustela nigripes) to (1) reexamine the assumed obligate relationship of these ferrets to prairie dogs (Cynomys spp.), (2) investigate habitat preferences of ferrets at a small scale (1 year (P = 0.048). Also, preference was stronger for wild-born...
