Comparative growth and consumption potential of rainbow trout and humpback chub in the Colorado River, Grand Canyon, Arizona, under different temperature scenarios
C.P. Paukert, J.H. Petersen
2007, Southwestern Naturalist (52) 234-242
We used bioenergetics models for humpback chub, Gila cypha, and rainbow trout, Oncorhynchus mykiss, to examine how warmer water temperatures in the Colorado River, Grand Canyon, Arizona, through a proposed selective withdrawal system (SWS) at Glen Canyon Dam, would affect growth, consumption, and predation rates. Consumption by the rainbow trout...
Seasonal and interannual variability in the taxonomic composition and production dynamics of phytoplankton assemblages in Crater Lake, Oregon
McIntire C. David, Gary L. Larson, Robert E. Truitt
2007, Hydrobiologia (574) 179-204
Taxonomic composition and production dynamics of phytoplankton assemblages in Crater Lake, Oregon, were examined during time periods between 1984 and 2000. The objectives of the study were (1) to investigate spatial and temporal patterns in species composition, chlorophyll concentration, and primary productivity relative to seasonal patterns of water circulation; (2)...
Ectoparasites in an urban population of big brown bats (Eptesicus fuscus) in Colorado
R.D. Pearce, T. J. O'Shea
2007, Journal of Parasitology (93) 518-530
Ectoparasites of an urban population of big brown bats (Eptesicus fuscus) in Fort Collins, Colorado, were investigated during summers 2002, 2003, and 2004. Eleven species of ectoparasites were found (the macronyssid mite Steatonyssus occidentalis, the wing mite Spinturnix bakeri, the myobiid mites Acanthophthirius caudata and Pteracarus aculeus, the chirodiscid mite...
Thiamine and fatty acid content of walleye tissue from three southern U.S. reservoirs
D. C. Honeyfield, C.S. Vandergoot, P.W. Bettoli, J. P. Hinterkopf, J.L. Zajicek
2007, Journal of Aquatic Animal Health (19) 84-93
We determined the thiamine concentration in egg, muscle, and liver tissues of walleyes Sander vitreus and the fatty acid content of walleye eggs from three southern U.S. reservoirs. In two Tennessee reservoirs (Dale Hollow and Center Hill), in which there were alewives Alosa pseudoharengus in the forage base, natural recruitment...
Satellite telemetry and prey sampling reveal contaminant sources to pacific northwest ospreys
J. E. Elliott, C.A. Morrissey, Charles J. Henny, E.R. Inzunza, P. Shaw
2007, Ecological Applications (17) 1223-1233
Migratory behavior can be an important factor in determining contaminant exposure in avian populations. Accumulation of organochlorine (OC) pesticides while birds are wintering in tropical regions has been cited often as the reason for high concentrations in migrant populations. To explore this issue, we satellite tracked 16 Ospreys (Pandion haliaetus)...
Opportunities for regional bird monitoring efforts in the Intermountain West to support the new State Wildlife Action Plans
B. Altman, D. Casey, J. Bart
2007, Great Basin Birds (9) 80
No abstract available....
Microsatellite loci for distinguishing spotted owls (Strix occidentalis), barred owls (Strix varia), and their hybrids
W. Chris Funk, Thomas D. Mullins, Eric D. Forsman, Susan M. Haig
2007, Molecular Ecology Resources (7) 284-286
We identified four diagnostic microsatellite loci that distinguish spotted owls (Strix occidentalis), barred owls (Strix varia), F1 hybrids and backcrosses. Thirty-four out of 52 loci tested (65.4%) successfully amplified, and four of these loci (11.8%) had allele sizes that did not overlap between spotted and barred owls. The probability of...
Phosphorus budgets in Everglades wetland ecosystems: The effects of hydrology and nutrient enrichment
G.B. Noe, D.L. Childers
2007, Wetlands Ecology and Management (15) 189-205
The Florida Everglades is a naturally oligotrophic hydroscape that has experienced large changes in ecosystem structure and function as the result of increased anthropogenic phosphorus (P) loading and hydrologic changes. We present whole-ecosystem models of P cycling for Everglades wetlands with differing hydrology and P enrichment with the goal of...
Synchrotron x-ray spectroscopy of EuHN O3 aqueous solutions at high temperatures and pressures and Nb-bearing silicate melt phases coexisting with hydrothermal fluids using a modified hydrothermal diamond anvil cell and rail assembly
Robert A. Mayanovic, Alan J. Anderson, William A. Bassett, I.-M. Chou
2007, Review of Scientific Instruments (78)
A modified hydrothermal diamond anvil cell (HDAC) rail assembly has been constructed for making synchrotron x-ray absorption spectroscopy, x-ray fluorescence, and x-ray mapping measurements on fluids or solid phases in contact with hydrothermal fluids up to ???900??C and 700 MPa. The diamond anvils of the HDAC are modified by laser...
Bedrock aquifers and population growth in the Denver Basin, Colorado, USA
J.E. Moore, R.G. Raynolds, M. Dechesne
2007, Episodes (30) 115-118
The Denver Basin bedrock aquifer system consists of Tertiary and Cretaceous age sedimentary rocks known as the Dawson, Denver, Arapahoe and Laramie-Fox Hills aquifers. The number of bedrock wells has increased from 12,000 in 1985 to over 33,700 in 2001 and the withdrawal of groundwater has caused water level declines...
Roadless space of the conterminous United States
R.D. Watts, R.W. Compton, J.H. McCammon, C.L. Rich, S.M. Wright, T. Owens, D.S. Ouren
2007, Science (316) 736-738
Roads encroaching into undeveloped areas generally degrade ecological and watershed conditions and simultaneously provide access to natural resources, land parcels for development, and recreation. A metric of roadless space is needed for monitoring the balance between these ecological costs and societal benefits. We introduce a metric, roadless volume (RV), which...
A simple daily soil-water balance model for estimating the spatial and temporal distribution of groundwater recharge in temperate humid areas
W. R. Dripps, K. R. Bradbury
2007, Hydrogeology Journal (15) 433-444
Quantifying the spatial and temporal distribution of natural groundwater recharge is usually a prerequisite for effective groundwater modeling and management. As flow models become increasingly utilized for management decisions, there is an increased need for simple, practical methods to delineate recharge zones and quantify recharge rates. Existing models for estimating...
The role of historical fire disturbance in the carbon dynamics of the pan-boreal region: A process-based analysis
M. S. Balshi, A. D. McGuire, Q. Zhuang, J. Melillo, D. W. Kicklighter, E. Kasischke, C. Wirth, M. Flannigan, J. Harden, Joy S. Clein, T.J. Burnside, J. McAllister, W.A. Kurz, M. Apps, A. Shvidenko
2007, Journal of Geophysical Research G: Biogeosciences (112)
[1] Wildfire is a common occurrence in ecosystems of northern high latitudes, and changes in the fire regime of this region have consequences for carbon feedbacks to the climate system. To improve our understanding of how wildfire influences carbon dynamics of this region, we used...
Late Quaternary stratigraphy and luminescence geochronology of the northeastern Mojave Desert
S. A. Mahan, D. M. Miller, C.M. Menges, J. C. Yount
2007, Quaternary International (166) 61-78
The chronology of the Holocene and late Pleistocene deposits of the northeastern Mojave Desert have been largely obtained using radiocarbon ages. Our study refines and extends this framework using optically stimulated luminescence (OSL) to date deposits from Valjean Valley, Silurian Lake Playa, Red Pass, and California Valley. Of particular interest...
Walleye consumption and long-term population trends following gizzard shad introduction into a Western South Dakota reservoir
M.J. Ward, D.W. Willis, B.H. Miller, S. R. Chipps
2007, Journal of Freshwater Ecology (22) 339-345
The gizzard shad (Dorosoma cepedianum) was introduced into 1,955-ha Angostura Reservoir, South Dakota to provide increased prey resources for walleye (Sander vitreus). Linear correlation analysis indicated that following gizzard shad introduction, walleye catch-per-unit-effort and mean length at age have increased over time (r = 0.68 to 0.85, P = 0.02...
Holocene slip rate for the western segment of the Castle Mountain fault, Alaska
J.B. Willis, Peter J. Haeussler, R.L. Bruhn, G.C. Willis
2007, Bulletin of the Seismological Society of America (97) 1019-1024
The western segment of the Castle Mountain fault poses a significant seismic hazard to the most populated region of south-central Alaska. We identify a previously unrecognized margin of a postglacial outwash channel that is offset right laterally 36 ± 4 m across the western segment of the Castle Mountain fault....
Blooms of the toxic dinoflagellate Alexandrium fundyense in the western Gulf of Maine in 1993 and 1994: A comparative modeling study
C.A. Stock, D.J. McGillicuddy Jr., D.M. Anderson, A.R. Solow, R. P. Signell
2007, Continental Shelf Research (27) 2486-2512
Blooms of the toxic dinoflagellate Alexandrium fundyense commonly occur in the western Gulf of Maine but the amount of toxin observed in coastal shellfish is highly variable. In this study, a coupled physical-biological model is used to investigate the dynamics underlying the observed A. fundyense abundance and shellfish toxicity in...
Initial insights from 2.5D hydraulic modeling of floods in Athabasca Valles, Mars
Laszlo P. Keszthelyi, Roger P. Denlinger, D. R. H. O’Connell, Devon M. Burr
2007, Geophysical Research Letters (34)
We present the first application of a 2.5D hydraulic model to catastrophic floods on Mars. This model simulates flow over complex topography and incorporates flood dynamics that could not be modeled in the earlier 1D models. We apply this model to Athabasca Valles, the youngest outflow channel on Mars, investigating...
Iron- and 4-hydroxy-2-alkylquinoline-containing periplasmic inclusion bodies of Pseudomonas aeruginosa: A chemical analysis
P.W. Royt, R.V. Honeychuck, R.R. Pant, M.L. Rogers, L.V. Asher, J.R. Lloyd, W.E. Carlos, H. E. Belkin, S. Patwardhan
2007, Bioorganic Chemistry (35) 175-188
Dark aggregated particles were seen on pellets of iron-rich, mid-logarithmic phase Pseudomonas aeruginosa. Transmission electron microscopy of these cells showed inclusion bodies in periplasmic vacuoles. Aggregated particles isolated from the spent medium of these cells contained iron as indicated by atomic absorption spectroscopy and by electron paramagnetic resonance spectroscopy that...
Role of chemotaxis in the transport of bacteria through saturated porous media
R.M. Ford, Ronald W. Harvey
2007, Advances in Water Resources (30) 1608-1617
Populations of chemotactic bacteria are able to sense and respond to chemical gradients in their surroundings and direct their migration toward increasing concentrations of chemicals that they perceive to be beneficial to their survival. It has been suggested that this phenomenon may facilitate bioremediation processes by bringing bacteria into closer...
Spatial and temporal geochemical trends in the hydrothermal system of Yellowstone National Park: Inferences from river solute fluxes
Shaul Hurwitz, Jacob B. Lowenstern, Henry Heasler
2007, Journal of Volcanology and Geothermal Research (162) 149-171
We present and analyze a chemical dataset that includes the concentrations and fluxes of HCO3−, SO42−, Cl−, and F− in the major rivers draining Yellowstone National Park (YNP) for the 2002–2004 water years (1 October 2001 – 30 September 2004). The total (molar) flux in all rivers decreases in the following...
Thermoregulation in larval aggregations of carrion-feeding blow flies (Diptera: Calliphoridae)
D. H. Slone, Susan V. Gruner
2007, Journal of Medical Entomology (44) 516-523
The growth and development of carrion-feeding calliphorid (Diptera Calliphoridae) larvae, or maggots, is of great interest to forensic sciences, especially for estimation of a postmortem interval (PMI). The development rate of calliphorid larvae is influenced by the temperature of their immediate environment. Heat generation in larval feeding aggregations (=maggot masses)...
Land
D. Dent, A.F. Asfary, C.P. Giri, K. Govil, A. Hartemink, P. Holmgren, F. Keita-Ouane, S. Navone, L. Olsson, R. Ponce-Hernandez, J. Rockstrom, G. Shepherd, G. Abdelgawad, N. Batjes, J.M. Beltran, A. Brink, N. Dronin, W. Essahli, G. Ewald, J. Illueca, S. Kant, T. Krug, W. Kueper, L. Wenlong, D. Macdevette, F. Nachtergaele, N. Ndiang’ui, J. Poulisse, C. Schmullius, A. Singh, B. Sonneveld, Harald Sverdrup, J. van Brusselen, G. van Lynden, A. Warren, W. Bingfang, W. Zhongze, K. Kassas, T. Maukonen, M. Lee
2007, Book chapter, Global environment outlook 4— Environment for development
No abstract available....
Data access and dissemination for emergency response and long-term recovery efforts related to Hurricanes Katrina and Rita
Scott Wilson, Chris Cretini
2007, Circular 1306-4B
The U.S. Geological Survey's (USGS) National Wetlands Research Center (NWRC) responded to Hurricanes Katrina and Rita by providing geospatial support to Federal, State, and local partners. The NWRC used its data and information management systems to deliver aerial photography and maps to emergency responders in a time of critical need....
Current and Future Science Plans for Restoring a Resilient Coast
2007, Circular 1306-8A
The overarching goal of U.S. Geological Survey (USGS) Gulf Coast science in the aftermath of the 2005 hurricane season will be to provide the scientific information, knowledge, and tools required to ensure that decisions about coastal land resource use, management practices, and future development in the coastal zone and adjacent...
