Estimating the impacts of reservoir elevation changes on kokanee emergence in Flaming Gorge Reservoir, Wyoming-Utah
T. Modde, R.J. Jeric, W.A. Hubert, R.D. Gipson
2011, North American Journal of Fisheries Management (17) 470-473
Flaming Gorge Reservoir, like many western North American reservoirs, is managed to release water during the winter months to allow for water storage associated with melting snow and rain during spring. Decreases in reservoir elevation during winter can cause mortalities of kokanee Oncorhynchus nerka spawned along the shoreline the previous fall. This...
Age at sexual maturity, sex ratio, fecundity, and longevity of isolated headwater populations of westslope cutthroat trout
Christopher C. Downs, Robert G. White, Bradely B. Shepard
2011, North American Journal of Fisheries Management (17) 85-92
We sampled 19 isolated headwater populations of westslope cutthroat trout Oncorhynchus clarki lewisi in Montana to provide estimates of fecundity, longevity, sex ratio, and age at sexual maturity. Fecundity was estimated for 31 fish collected from two streams in the upper Missouri River drainage. Females smaller than 149 mm fork length (FL)...
Modeling the fate and transport of polyaromatic hydrocarbons in the saturated zone, Grand Isle, Louisiana
Francis H. Chapelle, Mark A. Widdowson
2011, Report, Summary report for fate and effects of remnant oil remaining in the beach environment
No abstract available....
Aftershock distribution as a constraint on the geodetic model of coseismic slip for the 2004 Parkfield earthquake
Ninfa Bennington, Clifford Thurber, Kurt Feigl, Murray-Moraleda Jessica
2011, Pure and Applied Geophysics (168) 1553-1565
Several studies of the 2004 Parkfield earthquake have linked the spatial distribution of the event’s aftershocks to the mainshock slip distribution on the fault. Using geodetic data, we find a model of coseismic slip for the 2004 Parkfield earthquake with the constraint that the edges of coseismic slip patches align...
Chapter 9: Occurrence of small mammals: Deer mice and challenge of trapping across large spatial extents
Steven E. Hanser, Matthias Leu, Cameron L. Aldridge, Scott E. Nielsen, Steven T. Knick
2011, Book chapter, Sagebrush ecosystem conservation and management: Ecoregional assessment tools and models for the Wyoming Basins
Small mammal communities living in sagebrush (Artemisia spp.) may be sensitive to habitat isolation and invasion by exotic grass species. Yet there have been no spatially explicit models to improve our understanding of landscape-scale factors determining small mammal occurrence or abundance. We live-trapped small mammals at 186 locations in the...
Chapter 10: Occurrence of non-native invasive plants: The role of anthropogenic features
Scott E. Nielsen, Cameron L. Aldridge, Steven E. Hanser, Matthias Leu, Steven T. Knick
2011, Book chapter, Sagebrush ecosystem conservation and management: Ecoregional assessment tools and models for the Wyoming Basins
The invasion of non-native plants in the Wyoming Basins Ecoregional Assessment (WBEA) area is a major economic and ecological stress, with invasions thought to be hastened by energy developments. Given the potential impacts of nonnative invasive plants and the rapid changes in land use in the WBEA, broad-scale assessments and...
A westward extension of the warm pool leads to a westward extension of the Walker circulation, drying eastern Africa
A. Park Williams, Christopher C. Funk
2011, Climate Dynamics (37) 2417-2435
Observations and simulations link anthropogenic greenhouse and aerosol emissions with rapidly increasing Indian Ocean sea surface temperatures (SSTs). Over the past 60 years, the Indian Ocean warmed two to three times faster than the central tropical Pacific, extending the tropical warm pool to the west by ~40° longitude (>4,000 km). This propensity...
Chapter 11: Management considerations
Steven T. Knick, Steven E. Hanser, Matthias Leu, Cameron L. Aldridge, Scott E. Nielsen, Mary M. Rowland, Sean P. Finn, Michael J. Wisdom
2011, Book chapter, Sagebrush ecosystem conservation and management: Ecoregional assessment tools and models for the Wyoming Basins
We conducted an ecoregional assessment of sagebrush (Artemisia spp.) ecosystems in the Wyoming Basins and surrounding regions (WBEA) to determine broad-scale species-environmental relationships. Our goal was to assess the potential influence from threats to the sagebrush ecosystem on associated wildlife through the use of spatially explicit occurrence and abundance models....
Portrait of a small population of boreal toads (Anaxyrus boreas)
Erin Muths, Rick D. Scherer
2011, Herpetologica (67) 369-377
Much attention has been given to the conservation of small populations, those that are small because of decline, and those that are naturally small. Small populations are of particular interest because ecological theory suggests that they are vulnerable to the deleterious effects of environmental, demographic, and genetic stochasticity as well...
Integrating field observations and inverse and forward modeling: application at a site with acidic, heavy-metal-contaminated groundwater
Pierre D. Glynn, James G. Brown
2011, Book chapter, Geochemical modeling of groundwater: vadose and geothermal systems
Allelopathic cover crop prior to seeding is more important than subsequent grazing/mowing in grassland establishment
Daniel G. Milchunas, Mark W. Vandever, Leonard O. Ball, Skip Hyberg
2011, Rangeland Ecology and Management (64) 291-300
The effects of grazing, mowing, and type of cover crop were evaluated in a previous winter wheat–fallow cropland seeded to grassland under the Conservation Reserve Program in eastern Colorado. Prior to seeding, the fallow strips were planted to forage sorghum or wheat in alternating strips (cover crops), with no grazing,...
Pliocene Model Intercomparison Project (PlioMIP): experimental design and boundary conditions (Experiment 2)
A.M. Haywood, Harry J. Dowsett, Marci M. Robinson, Danielle K. Stoll, A.M. Dolan, D.J. Lunt, B. Otto-Bliesner, M.A. Chandler
2011, Geoscientific Model Development (4) 571-577
The Palaeoclimate Modelling Intercomparison Project has expanded to include a model intercomparison for the mid-Pliocene warm period (3.29 to 2.97 million yr ago). This project is referred to as PlioMIP (the Pliocene Model Intercomparison Project). Two experiments have been agreed upon and together compose the initial phase of PlioMIP. The...
Challenges of predicting the potential distribution of a slow-spreading invader: a habitat suitability map for an invasive riparian tree
Catherine S. Jarnevich, Lindsay V. Reynolds
2011, Biological Invasions (13) 153-163
Understanding the potential spread of invasive species is essential for land managers to prevent their establishment and restore impacted habitat. Habitat suitability modeling provides a tool for researchers and managers to understand the potential extent of invasive species spread. Our goal was to use habitat suitability modeling to map potential...
Geologic map of the Caetano caldera, Lander and Eureka counties, Nevada
Joseph P. Colgan, Christopher D. Henry, David A. John
2011, Nevada Bureau of Mines and Geology Map 174
The Eocene (34 Ma) Caetano caldera in north-central Nevada offers an exceptional opportunity to study the physical and petrogenetic evolution of a large (20 km by 10–18 km pre-extensional dimensions) silicic magma chamber, from precursor magmatism to caldera collapse and intrusion of resurgent plutons. Caldera-related rocks shown on this map...
Comparison of simulations of land-use specific water demand and irrigation water supply by MF-FMP and IWFM
Wolfgang Schmid, Emin Dogural, Randall T. Hanson, Tariq Kadir, Francis Chung
2011, Technical Information Record TIR-2
Two hydrologic models, MODFLOW with the Farm Process (MF-FMP) and the Integrated Water Flow Model (IWFM), are compared with respect to each model’s capabilities of simulating land-use hydrologic processes, surface-water routing, and groundwater flow. Of major concern among the land-use processes was the consumption of water through evaporation and transpiration...
Phase and amplitude inversion of crosswell radar data
Karl J. Ellefsen, Aldo T. Mazzella, Robert Horton, Jason R. McKenna
2011, Geophysics (76)
Phase and amplitude inversion of crosswell radar data estimates the logarithm of complex slowness for a 2.5D heterogeneous model. The inversion is formulated in the frequency domain using the vector Helmholtz equation. The objective function is minimized using a back-propagation method that is suitable for a 2.5D model and that...
Effects of eradication and restoration treatments on Italian thistle (Carduus pycnocephalus)
Thomas McGinnis, Jon Keeley
2011, Madroño (58) 207-213
Low elevation grasslands in California long have been dominated by Mediterranean grasses, but many areas still have large native forb populations. Alien forbs invade these grasslands, displacing both native and other alien species. Italian thistle is a noxious alien herb that has recently invaded these grasslands, including ungrazed blue oak...
Assessing first-order emulator inference for physical parameters in nonlinear mechanistic models
Mevin Hooten, William B. Leeds, Jerome Fiechter, Christopher K. Wikle
2011, Journal of Agricultural, Biological, and Environmental Statistics (16) 475-494
We present an approach for estimating physical parameters in nonlinear models that relies on an approximation to the mechanistic model itself for computational efficiency. The proposed methodology is validated and applied in two different modeling scenarios: (a) Simulation and (b) lower trophic level ocean ecosystem model. The approach we develop...
Estimating geographic variation on allometric growth and body condition of blue suckers with quantile regression
Brian S. Cade, James W. Terrell, Ben Neely
2011, Transactions of the American Fisheries Society (140) 1657-1669
Increasing our understanding of how environmental factors affect fish body condition and improving its utility as a metric of aquatic system health require reliable estimates of spatial variation in condition (weight at length). We used three statistical approaches that varied in how they accounted for heterogeneity in allometric growth to...
Electrical properties of methane hydrate + sediment mixtures
Wyatt L. Du Frane, Laura A. Stern, Karen A. Weitemeyer, Steven Constable, Jeffery J. Roberts
2011, Fire in the Ice: NETL Methane Hydrate Newsletter (11) 10-13
As part of our DOE-funded proposal to characterize gas hydrate in the Gulf of Mexico using marine electromagnetic methods, a collaboration between SIO, LLNL, and USGS with the goal of measuring the electrical properties of lab-created methane (CH4) hydrate and sediment mixtures was formed. We examined samples with known characteristics...
Seasonal and interannual effects of hypoxia on fish habitat quality in central Lake Erie
Kristin K. Arend, Dmitry Beletsky, Joseph DePinto, Stuart A. Ludsin, James Roberts, Daniel K. Rucinski, Donald Scavia, David J. Schwab, Tomas O. Hook
2011, Freshwater Biology (56) 366-383
1. Hypoxia occurs seasonally in many stratified coastal marine and freshwater ecosystems when bottom dissolved oxygen (DO) concentrations are depleted below 2–3 mg O2 L-1. 2. We evaluated the effects of hypoxia on fish habitat quality in the central basin of Lake Erie from 1987 to 2005, using bioenergetic growth rate...
Hibernacula selection by Townsend's big-eared bat in Southwestern Colorado
Mark A. Hayes, Robert A. Schorr, Kirk W. Navo
2011, Journal of Wildlife Management (75) 137-143
In western United States, both mine reclamations and renewed mining at previously abandoned mines have increased substantially in the last decade. This increased activity may adversely impact bats that use these mines for roosting. Townsend's big-eared bat (Corynorhinus townsendii) is a species of conservation concern that may be impacted by...
An analysis of fringed myotis (Myotis thysanodes), with a focus on Colorado distribution, maternity roost selection, and preliminary modeling of population dynamics
M. A. Hayes
2011, Thesis
No abstract available....
Stability of steep slopes in cemented sands
Brian D. Collins, Nicholas Sitar
2011, Journal of Geotechnical and Geoenvironmental Engineering (137) 43-51
The analysis of steep slope and cliff stability in variably cemented sands poses a significant practical challenge as routine analyses tend to underestimate the actually observed stability of existing slopes. The presented research evaluates how the degree of cementation controls the evolution of steep sand slopes and shows that the...
Hydrologic effects of urbanization and climate change on the Flint River Basin, Georgia
Roland J. Viger, Lauren E. Hay, Steven L. Markstrom, John Jones, Gary R. Buell
2011, Earth Interactions (15)
The potential effects of long-term urbanization and climate change on the freshwater resources of the Flint River basin were examined by using the Precipitation-Runoff Modeling System (PRMS). PRMS is a deterministic, distributed-parameter watershed model developed to evaluate the effects of various combinations of precipitation, temperature, and land cover on streamflow...
