Heat transport in the Red Lake Bog, Glacial Lake Agassiz Peatlands
J.M. McKenzie, D. I. Siegel, Donald O. Rosenberry, P.H. Glaser, Clifford I. Voss
2007, Hydrological Processes (21) 369-378
We report the results of an investigation on the processes controlling heat transport in peat under a large bog in the Glacial Lake Agassiz Peatlands. For 2 years, starting in July 1998, we recorded temperature at 12 depth intervals from 0 to 400 cm within a vertical peat profile at...
Upper cretaceous microbial petroleum systems in north-central Montana
Paul G. Lillis
2007, Mountain Geologist (44) 11-35
Cenomanian to Campanian rocks of north-central Montana contain shallow economic accumulations of dry natural gas derived from microbial methanogenesis. The methanogens utilized carbon dioxide derived from organic matter in the marginal marine sediments and hydrogen from in situ pore water to generate methane. The most recent USGS assessment of the shallow...
Subaqueous geology and a filling model for Crater Lake, Oregon
M. Nathenson, C. R. Bacon, D.W. Ramsey
2007, Hydrobiologia (574) 13-27
Results of a detailed bathymetric survey of Crater Lake conducted in 2000, combined with previous results of submersible and dredge sampling, form the basis for a geologic map of the lake floor and a model for the filling of Crater Lake with water. The most prominent landforms beneath the surface...
Estimation and application of indicator values for common macroinvertebrate genera and families of the United States
D.M. Carlisle, M. R. Meador, S.R. Moulton II, P. M. Ruhl
2007, Ecological Indicators (7) 22-33
Tolerance of macroinvertebrate taxa to chemical and physical stressors is widely used in the analysis and interpretation of bioassessment data, but many estimates lack empirical bases. Our main objective was to estimate genus- and family-level indicator values (IVs) from a data set of macroinvertebrate communities, chemical, and physical stressors collected...
Assessing exotic plant species invasions and associated soil characteristics: A case study in eastern Rocky Mountain National Park, Colorado, USA, using the pixel nested plot design
M. A. Kalkhan, E.J. Stafford, P.J. Woodly, T.J. Stohlgren
2007, Applied Soil Ecology (35) 622-634
Rocky Mountain National Park (RMNP), Colorado, USA, contains a diversity of plant species. However, many exotic plant species have become established, potentially impacting the structure and function of native plant communities. Our goal was to quantify patterns of exotic plant species in relation to native plant species, soil characteristics, and...
Distribution, habitat, size, and color pattern of Cnemidophorus lemniscatus (Sauria: Teiidae) on Cayo Cochino Pequeño, Honduras
Chad E. Montgomery, Robert N. Reed, Hayley J. Shaw, Scott M. Boback, James M. Walker
2007, Southwestern Naturalist (52) 38-45
Cayo Cochino Pequeño is a 0.64-km2 Caribbean island in the Cayos Cochinos archipelago, Department of Islas de la Bahía, Honduras. One published report noted the presence of the rainbow whiptail (Cnemidophorus lemniscatus) on Cayo Cochino Pequeño, but nothing is known about the biology of this insular population. During a part of...
Long-term limnological research and monitoring at Crater Lake, Oregon
G.L. Larson, R. Collier, M. Buktenica
2007, Hydrobiologia (574) 1-11
Crater Lake is located in the caldera of Mount Mazama in Crater Lake National Park, Oregon. The lake has a surface area of about 53 km2at an elevation of 1882 m and a maximum depth of 594 m. Limited studies of this ultraoligotrophic lake conducted between 1896 and 1981, lead...
Remote sensing and GIS technology in the Global Land Ice Measurements from Space (GLIMS) Project
B. Raup, Andreas Kaab, J.S. Kargel, M.P. Bishop, G. Hamilton, E. Lee, F. Paul, F. Rau, D. Soltesz, S.J.S. Khalsa, M. Beedle, C. Helm
2007, Computers & Geosciences (33) 104-125
Global Land Ice Measurements from Space (GLIMS) is an international consortium established to acquire satellite images of the world's glaciers, analyze them for glacier extent and changes, and to assess these change data in terms of forcings. The consortium is organized into a system of Regional Centers, each of which...
Earthquake-by-earthquake fold growth above the Puente Hills blind thrust fault, Los Angeles, California: Implications for fold kinematics and seismic hazard
L.A. Leon, S.A. Christofferson, J.F. Dolan, J.H. Shaw, T. L. Pratt
2007, Journal of Geophysical Research B: Solid Earth (112)
Boreholes and high-resolution seismic reflection data collected across the forelimb growth triangle above the central segment of the Puente Hills thrust fault (PHT) beneath Los Angeles, California, provide a detailed record of incremental fold growth during large earthquakes on this major blind thrust fault. These data document fold growth within...
Concentration, UV-spectroscopic characteristics and fractionation of DOC in stormflow from an urban stream, Southern California, USA
John A. Izbicki, Isabel Pimentel, Russell Johnson, George R. Aiken, Jerry Leenheer
2007, Environmental Chemistry (4) 35-48
The composition of dissolved organic carbon (DOC) in stormflow from urban areas has been greatly altered, both directly and indirectly, by human activities and there is concern that there may be public health issues associated with DOC, which has unknown composition from different sources within urban watersheds. This...
Heat, chloride, and specific conductance as ground water tracers near streams
M.H. Cox, G.W. Su, J. Constantz
2007, Ground Water (45) 187-195
Commonly measured water quality parameters were compared to heat as tracers of stream water exchange with ground water. Temperature, specific conductance, and chloride were sampled at various frequencies in the stream and adjacent wells over a 2-year period. Strong seasonal variations in stream water...
Wellsite, laboratory, and mathematical techniques for determining sorbed gas content of coals and gas shales utilizing well cuttings
K.D. Newell
2007, Natural Resources Research (16) 55-66
Drill cuttings can be used for desorption analyses but with more uncertainty than desorption analyses done with cores. Drill cuttings are not recommended to take the place of core, but in some circumstances, desorption work with cuttings can provide a timely and economic supplement to that of cores. The mixed...
Geology and complex collapse mechanisms of the 3.72 Ma Hannegan caldera, North Cascades, Washington, USA
David S. Tucker, Wes Hildreth, Tom Ullrich, Richard M. Friedman
2007, Geological Society of America Bulletin (119) 329-342
Contiguous ring faults of the 8 × 3.5 km Hannegan caldera enclose the Hannegan volcanics in the Cascade arc of northern Washington. The caldera collapsed in two phases, which each erupted rhyolitic ignimbrite (72.3%–75.2% SiO2). The first collapse phase, probably trap-door style, erupted...
Factors influencing ground-water recharge in the eastern United States
B. T. Nolan, R. W. Healy, P.E. Taber, K. Perkins, K.J. Hitt, D.M. Wolock
2007, Journal of Hydrology (332) 187-205
Ground-water recharge estimates for selected locations in the eastern half of the United States were obtained by Darcian and chloride-tracer methods and compared using statistical analyses. Recharge estimates derived from unsaturated-zone (RUZC) and saturated-zone (RSZC) chloride mass balance methods are less variable (interquartile ranges or IQRs are 9.5 and 16.1...
Seismoelectric data processing for surface surveys of shallow targets
S.S. Haines, A. Guitton, B. Biondi
2007, Geophysics (72)
The utility of the seismoelectric method relies on the development of methods to extract the signal of interest from background and source-generated coherent noise that may be several orders-of-magnitude stronger. We compare data processing approaches to develop a sequence of preprocessing and signal/noise separation and to quantify the noise level...
Can modeling improve estimation of desert tortoise population densities?
K.E. Nussear, C.R. Tracy
2007, Ecological Applications (17) 579-586
The federally listed desert tortoise (Gopherus agassizii) is currently monitored using distance sampling to estimate population densities. Distance sampling, as with many other techniques for estimating population density, assumes that it is possible to quantify the proportion of animals available to be counted in any census. Because desert tortoises spend...
Diurnal variation of oxygen and carbonate system parameters in Tampa Bay and Florida Bay
K. K. Yates, C. Dufore, N. Smiley, C. Jackson, R. B. Halley
2007, Marine Chemistry (104) 110-124
Oxygen and carbonate system parameters were measured, in situ, over diurnal cycles in Tampa Bay and Florida Bay, Florida. All system parameters showed distinct diurnal trends in Tampa Bay with an average range of diurnal variation of 39.1 μmol kg− 1 for total alkalinity, 165.1 μmol kg− 1 for total...
Sediment delivery after a wildfire
Steven L. Reneau, D. Katzman, G.A. Kuyumjian, A. Lavine, D.V. Malmon
2007, Geology (35) 151-154
We use a record of sedimentation in a small reservoir within the Cerro Grande burn area, New Mexico, to document postfire delivery of ash, other fine-grained sediment carried in suspension within floods, and coarse-grained sediment transported as bedload over a five-year period. Ash...
Effects of surface-water irrigation on sources, fluxes, and residence times of water, nitrate, and uranium in an alluvial aquifer
John Karl Bohlke, Ingrid M. Verstraeten, Thomas F. Kraemer
2007, Applied Geochemistry (22) 152-174
Effects of surface-water irrigation on an alluvial aquifer were evaluated using chemical and isotopic data including δ2H, δ18O, 3H, δ3He, Ar, Ne, N2, δ15N, and 234U/238U activity ratios in a transect of nested wells in the North Platte River valley in western Nebraska, USA. The data were used to evaluate sources and fluxes of H2O, <span...
Long-term monitoring of growth in the Eastern Elliptio, Elliptio complanata (Bivalvia: Unionidae), in Rhode Island: A transplant experiment
D.H. Kesler, T.J. Newton, L. Green
2007, Journal of the North American Benthological Society (26) 123-133
The lengths of marked specimens of the freshwater mussel, Eastern Elliptio (Elliptio complanata [Lightfoot 1786]), were monitored annually in 3 lakes in Rhode Island, USA, from 1991 to 2005. Mussels growing in Worden Pond showed a change in mean shell length of only 4.3 mm over 14 y, whereas mussel...
Spatiotemporal variability of stream habitat and movement of three species of fish
J.H. Roberts, P. L. Angermeier
2007, Oecologia (151) 417-430
Relationships between environmental variability and movement are poorly understood, due to both their complexity and the limited ecological scope of most movement studies. We studied movements of fantail (Etheostoma flabellare), riverweed (E. podostemone), and Roanoke darters (Percina roanoka) through two stream systems during two summers. We then related movement to...
Influences of wildfire and channel reorganization on spatial and temporal variation in stream temperature and the distribution of fish and amphibians
J. B. Dunham, A.E. Rosenberger, C.H. Luce, B.E. Rieman
2007, Ecosystems (10) 335-346
Wildfire can influence a variety of stream ecosystem properties. We studied stream temperatures in relation to wildfire in small streams in the Boise River Basin, located in central Idaho, USA. To examine the spatio-temporal aspects of temperature in relation to wildfire, we employed three approaches: a pre-post fire comparison of...
Evaluation of the status of anurans on a refuge in suburban Maryland
S.M. Brander, J. Andrew Royle, M. Eames
2007, Journal of Herpetology (41) 52-60
Because many anurans have well-defined breeding seasons and male anurans produce loud advertisement calls, surveys of these breeding choruses are believed to provide a dependable means of monitoring population trends. The Patuxent Research Refuge initiated such a calling survey in the spring of 1997, which uses volunteers to collect anuran...
U/Th series radionuclides as coastal groundwater tracers
P.W. Swarzenski
2007, Chemical Reviews (107) 663-674
The study of coastal groundwater has recently surfaced as an active interdisciplinary area of research, driven foremost by its importance as a poorly quantified pathway for subsurface material transport into coastal ecosystems. Key issue in coastal groundwater research include a complete geochemical characterization of the groundwater(s); quantification of the kinetics...
Annual modulation of seismicity along the San Andreas Fault near Parkfield, CA
L.B. Christiansen, Shaul Hurwitz, Steven E. Ingebritsen
2007, Geophysical Research Letters (34)
We analyze seismic data from the San Andreas Fault (SAF) near Parkfield, California, to test for annual modulation in seismicity rates. We use statistical analyses to show that seismicity is modulated with an annual period in the creeping section of the fault and a semiannual period in the locked section...
