Myxobolus cerebralis in native cutthroat trout of the Yellowstone Lake ecosystem
T.M. Koel, D.L. Mahony, K. L. Kinnan, C. Rasmussen, C. J. Hudson, S. Murcia, B.L. Kerans
2006, Journal of Aquatic Animal Health (18) 157-175
The exotic parasite Myxobolus cerebralis was first detected in native adult Yellowstone cutthroat trout Oncorhynchus clarkii bouvierii from Yellowstone Lake in 1998, seriously threatening the ecological integrity of this pristine, naturally functioning ecosystem. We immediately began to assess the prevalence and spatial extent of M. cerebralis infection in Yellowstone cutthroat...
Using experimental and geospatial data to estimate regional carbon sequestration potential under no-till management
Z. Tan, R. Lal, S. Liu
2006, Soil Science (171) 950-959
Conservation management of croplands at the plot scale has demonstrated a great potential to mitigate the greenhouse effect through sequestration of atmospheric carbon (C) into soil. This study estimated the potential of soil to sequester C through the conversion of croplands from conventional tillage (CT) to no-till (NT) in the...
Improving the design of acoustic and midwater trawl surveys through stratification, with an application to Lake Michigan prey fishes
J.V. Adams, R.L. Argyle, G.W. Fleischer, G.L. Curtis, R.G. Stickel
2006, North American Journal of Fisheries Management (26) 612-621
Reliable estimates of fish biomass are vital to the management of aquatic ecosystems and their associated fisheries. Acoustic and midwater trawl surveys are an efficient sampling method for estimating fish biomass in large bodies of water. To improve the precision of biomass estimates from combined acoustic and midwater trawl surveys,...
Intercalibration of research survey vessels on Lake Erie
J.T. Tyson, T.B. Johnson, C.T. Knight, M.T. Bur
2006, North American Journal of Fisheries Management (26) 559-570
Fish abundance indices obtained from annual research trawl surveys are an integral part of fisheries stock assessment and management in the Great Lakes. It is difficult, however, to administer trawl surveys using a single vessel-gear combination owing to the large size of these systems, the jurisdictional boundaries that bisect the...
Seismomagnetic effects from the long-awaited 28 September 2004 M 6.0 parkfield earthquake
M.J.S. Johnston, Y. Sasai, G.D. Egbert, R.J. Mueller
2006, Bulletin of the Seismological Society of America (96)
Precise measurements of local magnetic fields have been obtained with a differentially connected array of seven synchronized proton magnetometers located along 60 km of the locked-to-creeping transition region of the San Andreas fault at Parkfield, California, since 1976. The M 6.0 Parkfield earthquake on 28 September 2004, occurred within this...
Profile of microflora of the posterior intestine of Chinook salmon before, during, and after administration of rations with and without erythromycin
C.M. Moffitt, S.M.A. Mobin
2006, Conference Paper, North American Journal of Aquaculture
We describe the resident heterotrophic aerobic microflora of the salmonid posterior intestine before, during, and after the administration of rations with erythromycin in a hatchery raceway environment. We compare the profiles of medicated Chinook salmon Oncorhynchus tshawytscha with those of control fish that were not fed erythromycin. The combined counts...
Sulfates on Mars: A systematic Raman spectroscopic study of hydration states of magnesium sulfates
A. Wang, J.J. Freeman, B.L. Jolliff, I.-M. Chou
2006, Geochimica et Cosmochimica Acta (70) 6118-6135
The martian orbital and landed surface missions, OMEGA on Mar Express and the two Mars Explorations Rovers, respectively, have yielded evidence pointing to the presence of magnesium sulfates on the martian surface. In situ identification of the hydration states of magnesium sulfates, as well as the hydration states of other...
Frictional strength of cuttings and core from SAFOD drillhole phases 1 and 2
S. Tembe, D.A. Lockner, J.G. Solum, C.A. Morrow, T.-F. Wong, Diane E. Moore
2006, Geophysical Research Letters (33)
We investigated the frictional properties of drill cuttings and core obtained from 1.85-3.1 km true vertical depth in the SAFOD scientific borehole in central California. Triaxial frictional sliding experiments were conducted on samples from primary lithologic traits and significant shear zones, including the inferred active trace of the San Andreas...
Intradaily variability of water quality in a shallow tidal lagoon: Mechanisms and implications
L.V. Lucas, D.M. Sereno, J.R. Burau, T.S. Schraga, C.B. Lopez, M.T. Stacey, K.V. Parchevsky, V.P. Parchevsky
2006, Estuaries and Coasts (29) 711-730
Although surface water quality and its underlying processes vary over time scales ranging from seconds to decades, they have historically been studied at the lower (weekly to interannual) frequencies. The aim of this study was to investigate intradaily variability of three water quality parameters in a small freshwater tidal...
Evaluation of aerial survey methods for Dall's sheep
Mark S. Udevitz, Brad S. Shults, Layne G. Adams, Christopher Kleckner
2006, Wildlife Society Bulletin (34) 732-740
Most Dall's sheep (Ovis dalli dalli) population-monitoring efforts use intensive aerial surveys with no attempt to estimate variance or adjust for potential sightability bias. We used radiocollared sheep to assess factors that could affect sightability of Dall's sheep in standard fixed-wing and helicopter surveys and to evaluate feasibility of methods...
Pathogens, nutritional deficiency, and climate influences on a declining moose population
D.L. Murray, E.W. Cox, W.B. Ballard, Heather A. Whitlaw, M.S. Lenarz, T. W. Custer, T. Barnett, T.K. Fuller
2006, Wildlife Monographs 1-30
Several potential proximate causes may be implicated in a recent (post-1984) decline in moose (Alces alces andersoni) numbers at their southern range periphery in northwest Minnesota, USA. These causes include deleterious effects of infectious pathogens, some of which are associated with white-tailed deer (Odocoileus virginianus), negative effects of climate change,...
Coseismic and postseismic slip of the 2004 Parkfield earthquake from space-geodetic data
I.A. Johanson, E.J. Fielding, F. Rolandone, R. Burgmann
2006, Bulletin of the Seismological Society of America (96)
We invert interferometric synthetic aperture radar (InSAR) data jointly with campaign and continuous global positioning system (GPS) data for slip in the coseismic and postseismic periods of the 2004 Parkfield earthquake. The InSAR dataset consists of eight interferograms from data collected by the Envisat and Radarsat satellites spanning the time...
Ecology of a population of subsidized predators: Common ravens in the central Mojave Desert, California
W.I. Boarman, M.A. Patten, R.J. Camp, S.J. Collis
2006, Journal of Arid Environments (67) 248-261
Human subsidies have resulted in the rapid growth of populations of common ravens (Corvus corax) in the Mojave Desert. This is a management concern because ravens prey on threatened desert tortoises (Gopherus agassizii). We conducted weekly counts for 29 months at 10 sites on the US Army's National Training Center,...
Attributes of desert tortoise populations at the National Training Center, Central Mojave Desert, California, USA
K.H. Berry, T.Y. Bailey, K.M. Anderson
2006, Journal of Arid Environments (67) 165-191
We sampled 21 study plots for desert tortoises (Gopherus agassizii) at the National Training Center, Fort Irwin, California. Each plot was sampled once between 1997 and 2003 to obtain a snapshot of population attributes, status, and relationships between tortoise densities and human activities. Densities ranged from <1 to 28 tortoises...
Late Holocene lake-level fluctuations in Walker Lake, Nevada, USA
F. Yuan, B.K. Linsley, S. S. Howe, S.P. Lund, J. P. McGeehin
2006, Palaeogeography, Palaeoclimatology, Palaeoecology (240) 497-507
Walker Lake, a hydrologically closed, saline, and alkaline lake, is situated along the western margin of the Great Basin in Nevada of the western United States. Analyses of the magnetic susceptibility (??), total inorganic carbon (TIC), and oxygen isotopic composition (??18O) of carbonate sediments including ostracode shells (Limnocythere ceriotuberosa) from...
Giant sand waves at the mouth of San Francisco Bay
P.L. Barnard, D.M. Hanes, D. M. Rubin, R.G. Kvitek
2006, Eos, Transactions, American Geophysical Union (87) 287-289
A field of giant sand waves, among the largest in the world, recently was mapped in high resolution for the first time during a multibeam survey in 2004 and 2005 through the strait of the Golden Gate at the mouth of San Francisco Bay in California (Figure la). This massive...
Net energy payback and CO2 emissions from three midwestern wind farms: An update
S.W. White
2006, Natural Resources Research (15) 271-281
This paper updates a life-cycle net energy analysis and carbon dioxide emissions analysis of three Midwestern utility-scale wind systems. Both the Energy Payback Ratio (EPR) and CO2 analysis results provide useful data for policy discussions regarding an efficient and low-carbon energy mix. The EPR is the amount of electrical energy...
Seismic characteristics of central Brazil crust and upper mantle: A deep seismic refraction study
J.E. Soares, J. Berrocal, R.A. Fuck, Thomas Mooney, D.B.R. Ventura
2006, Journal of Geophysical Research B: Solid Earth (111)
[1] A two‐dimensional model of the Brazilian central crust and upper mantle was obtained from the traveltime interpretation of deep seismic refraction data from the Porangatu and Cavalcante lines, each approximately 300 km long. When the lines were deployed, they overlapped by 50 km, forming an E‐W...
Incorporation of seawater into mid-ocean ridge lava flows during emplacement
S.A. Soule, D.J. Fornari, M.R. Perfit, W.I. Ridley, M.H. Reed, J.R. Cann
2006, Earth and Planetary Science Letters (252) 289-307
Evidence for the interaction between seawater and lava during emplacement on the deep seafloor can be observed in solidified flows at a variety of scales including rapid quenching of their outer crusts and the formation of lava pillars through the body of the flow. Recently, an additional interaction, incorporation of...
Reticulate melanism in western painted turtles (Chrysemys picta bellii): Exploring linkages with habitat and heating rates
W.K. Gronke, S. R. Chipps, S.J. Bandas, K.F. Higgins
2006, American Midland Naturalist (156) 289-298
In western painted turtles (Chrysemys picta bellii), males often exhibit one of two morphs: (1) a reticulated form, characterized by an intricate network of dark markings on the carapace or (2) a non-reticulated form. Although several hypotheses have been proposed to explain the adaptive significance of reticulate melanism (RM) on...
Use of cotton gin trash to enhance denitrification in restored forested wetlands
S. Ullah, S.P. Faulkner
2006, Forest Ecology and Management (237) 557-563
Lower Mississippi Valley (LMV) has lost about 80% bottomland hardwood forests, mainly to agriculture. This landscape scale alteration of the LMV resulted in the loss of nitrate (NO3) removal capacity of the valley, contributing to nitrogen (N)-enhanced eutrophication and potentially hypoxia in the northern Gulf of Mexico. Restoration of hardwood...
Comparison of the effects and performance of four types of radiotransmitters for use with scoters
S. A. Iverson, W. S. Boyd, Daniel Esler, D.M. Mulcahy, Timothy D. Bowman
2006, Wildlife Society Bulletin (34) 656-663
Radiotransmitters are widely used in wildlife ecology, often providing data that cannot be collected using other methods. However, negative effects have been associated with the use of transmitters for some species. We evaluated the effects and performance of 4 radiotransmitter types for use with surf and white-winged scoters (Melanitta perspicillata...
Global synthesis of groundwater recharge in semiarid and arid regions
Bridget R. Scanlon, K.E. Keese, A. L. Flint, L. E. Flint, C.B. Gaye, W.M. Edmunds, I. Simmers
2006, Hydrological Processes (20) 3335-3370
Global synthesis of the findings from ∼140 recharge study areas in semiarid and arid regions provides important information on recharge rates, controls, and processes, which are critical for sustainable water development. Water resource evaluation, dryland salinity assessment (Australia), and radioactive waste disposal (US) are among the primary goals of many...
Does body size affect a bird's sensitivity to patch size and landscape structure?
Maiken Winter, Douglas H. Johnson, Jill A. Shaffer
2006, Condor (108) 808-816
Larger birds are generally more strongly affected by habitat loss and fragmentation than are smaller ones because they require more resources and thus larger habitat patches. Consequently, conservation actions often favor the creation or protection of larger over smaller patches. However, in grassland systems the boundaries between a patch and...
Hyporheic exchange and fulvic acid redox reactions in an alpine stream/wetland ecosystem, Colorado front range
Matthew P. Miller, Diane M. McKnight, R.M. Cory, Mark W. Williams, Robert L. Runkel
2006, Environmental Science & Technology (40) 5943-5949
The influence of hyporheic zone interactions on the redox state of fulvic acids and other redox active species was investigated in an alpine stream and adjacent wetland, which is a more reducing environment. A tracer injection experiment using bromide (Br-) was conducted in the stream system. Simulations...
