Geophysical setting of the February 21, 2008 Mw 6 Wells earthquake, Nevada, and implications for earthquake hazards
David A. Ponce, Janet T. Watt, C. Bouligand
2011, Nevada Bureau of Mines and Geology Special Publication 36
We utilize gravity and magnetic methods to investigate the regional geophysical setting of the Wells earthquake. In particular, we delineate major crustal structures that may have played a role in the location of the earthquake and discuss the geometry of a nearby sedimentary basin that may have contributed to observed...
Tracking the autumn migration of the bar-headed goose (Anser indicus) with satellite telemetry and relationship to environmental conditions
Yaonan Zhang, Meiyu Hao, John Y. Takekawa, Fumin Lei, Baoping Yan, Diann J. Prosser, David C. Douglas, Zhi Xing, Scott H. Newman
2011, International Journal of Zoology (2011)
The autumn migration routes of bar-headed geese captured before the 2008 breeding season at Qinghai Lake, China, were documented using satellite tracking data. To assess how the migration strategies of bar-headed geese are influenced by environmental conditions, the relationship between migratory routes, temperatures, and vegetation coverage at stopovers sites estimated...
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...
The regional structural setting of the 2008 Wells earthquake and Town Creek Flat Basin: implications for the Wells earthquake fault and adjacent structures
Christopher S. Henry, Joseph P. Colgan
2011, Nevada Bureau of Mines and Geology Special Publication 36
The 2008 Wells earthquake occurred on a northeast-striking, southeast-dipping fault that is clearly delineated by the aftershock swarm to a depth of 10-12 km below sea level. However, Cenozoic rocks and structures around Wells primarily record east-west extension along north- to north-northeast-striking, west-dipping normal faults that formed during the middle...
Time constraints in temperate-breeding species: Influence of growing season length on reproductive strategies
K. E. B. Gurney, Russell G. Clark, Stuart Slattery, N. V. Smith-Downey, Jordan I. Walker, L. M. Armstrong, S. E. Stephens, Michael J. Petrula, R. M. Corcoran, K. Martin, K. A. Degroot, Rodney W. Brook, Alan D. Afton, K. Cutting, J. M. Warren, M. Fournier, David N. Koons
2011, Ecography (34) 628-636
Organisms that reproduce in temperate regions have limited time to produce offspring successfully, and this constraint is expected to be more pronounced in areas with short growing seasons. Information concerning how reproductive ecology of endotherms might be influenced by growing season length (GSL) is rare, and species that breed over...
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...
Carbon and nitrogen biogeochemistry of a Prairie Pothole Wetland, Stutsman County, North Dakota, USA
JoAnn M. Holloway, Martin B. Goldhaber, Christopher T. Mills
2011, Applied Geochemistry (26, supplement) S44-S47
The concentration and form of dissolved organic C (DOC) and N species (NH4+ and NO3-) were investigated as part of a larger hydrogeochemical study of the Cottonwood Lake Study Area within the Prairie Potholes region. Groundwater, pore water and surface wetland water data were used to help characterize the relationships...
Trophic relations of introduced flathead catfish in an atlantic river
Jessica R. Baumann, Thomas J. Kwak
2011, Transactions of the American Fisheries Society (140) 1120-1134
The flathead catfish Pylodictis olivaris is a large piscivore that is native to the Mississippi and Rio Grande river drainages but that has been widely introduced across the United States. River ecologists and fisheries managers are concerned about introduced flathead catfish populations because of the negative impacts on native fish...
Larval fish dynamics in spring pools in middle Tennessee
Phillip William Bettoli, C.A. Goldsworthy
2011, Southeastern Naturalist (10) 145-154
We used lighted larval traps to assess reproduction by fishes inhabiting nine spring pools in the Barrens Plateau region of middle Tennessee between May and September 2004. The traps (n = 162 deployments) captured the larval or juvenile forms of Etheostoma crossopterum (Fringed Darter) (n = 188), Gambusia affinis (Western...
Migration And wintering areas Of Glaucous-winged Gulls From south-central Alaska
Scott A. Hatch, V.A. Gill, Daniel M. Mulcahy
2011, The Condor (113) 340-351
We used satellite telemetry to investigate the migration patterns and wintering areas of Glaucous-winged Gulls (Larus glaucescens) from Middleton Island, Alaska, where this species' population increased tenfold from the 1970s to the 1990s. Fall migration spanned 11 weeks, including numerous stopovers en route, apparently for feeding. Spring migration from wintering...
Effects of climate change on nutrition and genetics of White-tailed Ptarmigan
Sara J. Oyler-McCance, Craig A. Stricker, Judy St. John, Clait E. Braun, Gregory T. Wann, Cameron L. Aldridge
Brett K. Sandercock, Kathy Martin, Gernot Segelbacher, editor(s)
2011, Book chapter, Ecology, conservation, and management of grouse (Studies in Avian Biology no. 39)
White-tailed Ptarmigan (Lagopus leucura) are well suited as a focal species for the study of climate change because they are adapted to cool, alpine environments that are expected to undergo unusually rapid climate change. We compared samples collected in the late 1930s, the late 1960s, and the late 2000s...
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...
Fine scale movements and habitat use of black brant during the flightless Wing Molt in Arctic Alaska
Tyler L. Lewis, Paul L. Flint, Dirk V. Derksen, Joel A. Schmutz
2011, Waterbirds (34) 177-185
Thousands of Black Brant (Branta bernicla nigricans) migrate annually to the Teshekpuk Lake Special Area (TLSA), Alaska, to undergo the flightless wing molt on tundra lakes and wetlands. GPS transmitters were attached to Brant over two summers (2007–2008) to examine patterns of movement and habitat use of molting Brant, including...
Marine West Coast forests
Steven S. Perakis, Linda H. Geiser, Erik A. Lilleskov
Linda H. Pardo, Molly J. Robin-Abbott, Charles T. Driscoll, editor(s)
2011, General Technical Report NRS-80-9
No abstract available....
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...
An assessment of stressor extent and biological condition in the North American mid-continent great rivers (USA)
Ted R. Angradi, David W. Bolgriend, Terri M. Jicha, Mark S. Pearson, Debra L. Taylor, Mary F. Moffett, Karen A. Blocksom, David M. Walters, Colleen M. Elonen, Leroy E. Anderson, James M. Lazorchak, Euan D. Reavie, Amy R. Kireta, Brian H. Hill
2011, River Systems (19) 48-68
We assessed the North American mid-continent great rivers (Upper Mississippi, Missouri, and Ohio). We estimated the extent of each river in most- (MDC) or least-disturbed condition (LDC) based on multiple biological response indicators: fish and macroinvertebrate, trophic state based on chlorophyll a, macrophyte cover, and exposure of fish-eating wildlife to...
High throughput computing: a solution for scientific analysis
M. O'Donnell
2011, Report
Public land management agencies continually face resource management problems that are exacerbated by climate warming, land-use change, and other human activities. As the U.S. Geological Survey (USGS) Fort Collins Science Center (FORT) works with managers in U.S. Department of the Interior (DOI) agencies and other federal, state, and private entities,...
Status and distribution of mangrove forests of the world using earth observation satellite data
Chandra Giri, E. Ochieng, Larry L. Tieszen, Zhi-Liang Zhu, Ashbindu Singh, Thomas R. Loveland, Jeffery G. Masek, Norm Duke
2011, Global Ecology and Biogeography (20) 154-159
Aim Our scientific understanding of the extent and distribution of mangrove forests of the world is inadequate. The available global mangrove databases, compiled using disparate geospatial data sources and national statistics, need to be improved. Here, we mapped the status and distributions of global mangroves using recently available Global Land...
Status and distribution of breeding secretive marshbirds in the Delta of Arkansas
Michael J. Budd, David G. Krementz
2011, Southeastern Naturalist (10) 687-702
We surveyed the Lower Mississippi Alluvial Valley of Arkansas ("the Delta") during the breeding seasons of 2005 and 2006 using the national marshbird monitoring protocol for secretive marshbirds. We detected and documented breeding by Podilymbus podiceps (Pied-billed Grebe), Ixobrychus exilis (Least Bittern), Rallus elegans (King Rail), and Gallinula chloropus (Common...
An innovative method for nondestructive analysis of cast iron artifacts at Hopewell Furnace National Historic Site, Pennsylvania
Ronald A. Sloto, Martin F. Helmke
2011, Park Science (27) 50-53
The U.S. Geological Survey (USGS) is conducting research at Hopewell Furnace National Historic Site (fig. 1; see sidebar, page 53) in southeastern Pennsylvania to determine the fate of trace metals, such as arsenic, cobalt, and lead, released into the environment during the iron-smelting process. Arsenic is a carcinogen, cobalt is...
The ichthyofauna of drifting macrophyte mats in the Ivinhema River, upper Paraná River basin, Brazil
C. K. Bulla, Luiz Carlos Gomes, Leandro E. Miranda, A. A. Agostinho
2011, Neotropical Ichthyology (9) 403-409
We describe the fish assemblages associated with drifting macrophyte mats and consider their possible role as dispersal vectors in the Ivinhema River, a major tributary of the upper Paraná River, Brazil. Fish associated with drifting mats were sampled in the main river channel during January and March 2005, when the...
Seasonal movement and mesohabitat usage of adult and juvenile lake sturgeon in the Grasse River, New York
D.G. Trested, Matthew D. Chan, W. C. Bridges, J. Jeffery Isely
2011, Transactions of the American Fisheries Society (140) 1006-1014
Long-term restoration efforts for lake sturgeon Acipenser fulvescens populations will benefit from better understanding of this species' movements and habitat use in riverine systems. Radio transmitters were implanted in both juvenile and adult lake sturgeon in the Grasse River, New York, and individuals were relocated over a 2-year period. Adult...
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...
Breeding chorus indices are weakly related to estimated abundance of Boreal Chorus Frogs
Paul Stephen Corn, Erin Muths, Amanda Kissel, Rick D. Scherer
2011, Copeia (3) 365-371
Call surveys used to monitor breeding choruses of anuran amphibians generate index values that are frequently used to represent the number of male frogs present, but few studies have quantified this relationship. We compared abundance of male Boreal Chorus Frogs (Pseudacris maculata), estimated using capture–recapture methods in two populations...
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...
