Conference Papers
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The USGS provides unbiased, objective, and impartial scientific information upon which our audiences, including resource managers, planners, and other entities, rely.
Browse almost 5,000 conference papers authored by our scientists and refine search by topic, location, year, and advanced search.
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Status and conservation of lampreys in California
Abstract.—Lampreys are among the least studied group of fishes in California. At least seven species inhabit freshwater habitats within the state, including the Kern brook lamprey Lampetra hubbsi, a California endemic. Four species are micropredators on fish, Pacific lamprey Entosphenus tridentatus (formerly L. tridentata), river lamprey L. ayresii, Klamath lamprey E. similis (formerly L. similis)
Authors
Peter B. Moyle, Larry R. Brown, Shawn D. Chase, Rebecca M. Quiñones
Evaluation of flow structure and bed load velocity in the vicinity of a submerged wing dike in a large sand bed river
No abstract available.
Authors
E. C. Jamieson, C. D. Rennie, R. B. Jacobson
Pelagic habitat visualization: the need for a third (and fourth) dimension: HabitatSpace
Habitat in open water is not simply a 2-D to 2.5-D surface such as the ocean bottom or the air-water interface. Rather, pelagic habitat is a 3-D volume of water that can change over time, leading us to the term habitat space. Visualization and analysis in 2-D is well supported with GIS tools, but a new tool was needed for visualization and analysis in four dimensions. Observational data (cruise pr
Authors
C Beegle-Krause, Tiffany Vance, Debbie Reusser, David Stuebe, Eoin Howlett
Inversion of multichannel geophysical data with projected kernels
Statistical de‐noising methods such as Principal Component Analysis modify data in a way not constrained by physics. In much the same way as frequency‐filtered data must incorporate altered frequency content into numerical interpretation, so must statistically rotated data include the rotation operator in inversion processes. We propose a method of accounting for statistical reduction of data in n
Authors
M. Andy Kass, Trevor P. Irons, Yaoguo Li
Influence of Old World bluestem (Bothrichloa ischaemum) monocultures on breeding density of three grassland songbirds in Oklahoma
Despite persistent and widespread declines of grassland birds in North America, few studies have assessed differences between native grasslands and seeded monocultures as songbird habitat. In the Great Plains, many fields enrolled in the Conservation Reserve Program have been seeded to Old World bluestems (OWB), but there is evidence to suggest that OWB may not provide suitable conditions for sev
Authors
Andrew D. George, Timothy J. O'Connell, Karen R. Hickman, David M. Leslie
Defining fish nursery habitats: An application of otolith elemental fingerprinting in Tampa Bay, Florida
Fishing in Tampa Bay enhances the quality of life of the area's residents and visitors. However, people's desire to settle along the Bay's shorelines and tributaries has been detrimental to the very habitat believed to be crucial to prime target fishery species. Common snook (Centropomus undecimalis) and red drum (Sciaenops ocellatus) are part of the suite of estuarine fishes that 1) are economica
Authors
Janet A. Ley, Carole C. McIvor, Ernst B Peebles, Holly Rolls, Suzanne T. Cooper
Inference of distributional parameters from compositional samples containing nondetects
Low concentrations of elements in geochemical analyses have the peculiarity of being compositional data and, for a given level of significance, are likely to be beyond the capabilities of laboratories to distinguish between minute concentrations and complete absence, thus preventing laboratories from reporting extremely low concentrations of the analyte. Instead, what is reported is the detection
Authors
Ricardo A. Olea
Quantifying the undiscovered geothermal resources of the United States
In 2008, the U.S. Geological Survey (USGS) released summary results of an assessment of the electric power production potential from the moderate- and high-temperature geothermal resources of the United States (Williams et al., 2008a; USGS Fact Sheet 2008-3082; http://pubs.usgs.gov/fs/2008/3082). In the assessment, the estimated mean power production potential from undiscovered geothermal resource
Authors
Colin F. Williams, Marshall J. Reed, Jacob DeAngelo, S. Peter Galanis
Analysis of complex pumping interactions during an aquifer test conducted at a well field in the coastal plain near Augusta, Georgia, October 2009
A 24-hour aquifer test was conducted in Well Field 2 near Augusta, Georgia, October 21–22, 2009, to characterize the hydraulic properties of the Midville aquifer system. The selected well was pumped at a rate of 684 gallons per minute. At the initiation of aquifer-test pumping, water levels in each of eight wells monitored for the test were still recovering from the well-field production. Because
Authors
Gerald J. Gonthier
Use of the U.S. Geological Survey StreamStats Web Application for dam safety analysis
No abstract available.
Authors
John D. Guthrie, Kernell G. Ries, Peter A. Steeves
Temporal characteristics of coherent flow structures generated over alluvial sand dunes, Mississippi River, revealed by acoustic doppler current profiling and multibeam echo sounding
This paper investigates the flow in the lee of a large sand dune located at the confluence of the Mississippi and Missouri Rivers, USA. Stationary profiles collected from an anchored boat using an acoustic Doppler current profiler (ADCP) were georeferenced with data from a real-time kinematic differential global positioning system. A multibeam echo sounder was used to map the bathymetry of the con
Authors
John A. Czuba, Kevin A. Oberg, Jim L. Best, Daniel R. Parsons, S. M. Simmons, K. K. Johnson, C. Malzone