Magnetic susceptibility as a proxy for investigating microbially mediated iron reduction
F.M. Mewafy, E.A. Atekwana, D.D. Werkema, L.D. Slater, D. Ntarlagiannis, A. Revil, M. Skold, Geoffrey N. Delin
2011, Geophysical Research Letters (38)
We investigated magnetic susceptibility (MS) variations in hydrocarbon contaminated sediments. Our objective was to determine if MS can be used as an intrinsic bioremediation indicator due to the activity of iron-reducing bacteria. A contaminated and an uncontaminated core were retrieved from a site contaminated with crude oil near Bemidji, Minnesota...
Effects of uncertain topographic input data on two-dimensional flow modeling in a gravel-bed river
C.J. Legleiter, P.C. Kyriakidis, R. R. McDonald, J. M. Nelson
2011, Water Resources Research (47)
Many applications in river research and management rely upon two-dimensional (2D) numerical models to characterize flow fields, assess habitat conditions, and evaluate channel stability. Predictions from such models are potentially highly uncertain due to the uncertainty associated with the topographic data provided as input. This study used a spatial stochastic...
Faulted terrace risers place new constraints on the late Quaternary slip rate for the central Altyn Tagh fault, northwest Tibet
R.D. Gold, E. Cowgill, J.R. Arrowsmith, X. Chen, W.D. Sharp, K.M. Cooper, X.-F. Wang
2011, Geological Society of America Bulletin (123) 958-978
The active, left-lateral Altyn Tagh fault defines the northwestern margin of the Tibetan Plateau in western China. To clarify late Quaternary temporal and spatial variations in slip rate along the central portion of this fault system (85°–90°E), we have more than doubled the number of dated offset markers along the...
Spatial variability of biotic and abiotic tree establishment constraints across a treeline ecotone in the Alaska Range
K.M. Stueve, R.E. Isaacs, L.E. Tyrrell, R.V. Densmore
2011, Ecology (92) 496-506
Throughout interior Alaska (USA), a gradual warming trend in mean monthly temperatures occurred over the last few decades (∼∼2-–4°°C). The accompanying increases in woody vegetation at many alpine treeline (hereafter treeline) locations provided an opportunity to examine how biotic and abiotic local site conditions interact to control tree establishment patterns...
Atomic weights of the elements 2009 (IUPAC technical report)
M.E. Wieser, Tyler B. Coplen
2011, Pure and Applied Chemistry (83) 359-396
The biennial review of atomic-weight determinations and other cognate data has resulted in changes for the standard atomic weights of 11 elements. Many atomic weights are not constants of nature, but depend upon the physical, chemical, and nuclear history of the material. The standard atomic weights of 10 elements having...
Geostatistical modeling of riparian forest microclimate and its implications for sampling
B.N.I. Eskelson, P. D. Anderson, J.C. Hagar, H. Temesgen
2011, Canadian Journal of Forest Research (41) 974-985
Predictive models of microclimate under various site conditions in forested headwater stream - riparian areas are poorly developed, and sampling designs for characterizing underlying riparian microclimate gradients are sparse. We used riparian microclimate data collected at eight headwater streams in the Oregon Coast Range to compare ordinary kriging (OK), universal...
Biomarkers of mercury exposure in two eastern Ukraine cities
H. Gibb, C. Haver, K. Kozlov, J.A. Centeno, V. Jurgenson, Allan Kolker, Kathryn M. Conko, Edward R. Landa, H. Xu
2011, Journal of Occupational and Environmental Hygiene (8) 187-193
This study evaluates biomarkers of mercury exposure among residents of Horlivka, a city in eastern Ukraine located in an area with geologic and industrial sources of environmental mercury, and residents of Artemivsk, a nearby comparison city outside the mercury-enriched area. Samples of urine, blood, hair, and...
Effectiveness of bait tubes for brown treesnake control on Guam
B. Lardner, J. A. Savidge, G.H. Rodda, R.N. Reed, A. A. Yackel Adams, C.S. Clark
2011, Conference Paper, Island Invasives: Eradication and Management: Proceedings of the International Conference on Island Invasives
A bait tube is a device with which a toxicant inserted in a dead mouse (Mus musculus) can be delivered to invasive brown treesnakes (Boiga irregularis) with low risk of non-target bait take. We tested two bait tube designs in a 5ha snake enclosure where the identity of virtually every...
Informal trail monitoring protocols: Denali National Park and Preserve. Final Report, October 2011
Jeffrey L. Marion, Jeremy F. Wimpey
2011, Report
Managers at Alaska?s Denali National Park and Preserve (DENA) sponsored this research to assess and monitor visitor-created informal trails (ITs). DENA is located in south-central Alaska and managed as a six million acre wilderness park. This program of research was guided by the following objectives: (1) Investigate alternative methods for...
Responses of wind erosion to climate-induced vegetation changes on the Colorado Plateau
Seth M. Munson, Jayne Belnap, Gregory S. Okin
2011, Proceedings of the National Academy of Sciences (108) 3854-3859
Projected increases in aridity throughout the southwestern United States due to anthropogenic climate change will likely cause reductions in perennial vegetation cover, which leaves soil surfaces exposed to erosion. Accelerated rates of dust emission from wind erosion have large implications for ecosystems and human well-being, yet there is poor understanding...
Sedimentary response to orogenic exhumation in the northern Rocky Mountain Basin and Range province, Flint Creek basin, west-central Montana
R.A. Portner, M.S. Hendrix, J.C. Stalker, D. P. Miggins, S.D. Sheriff
2011, Canadian Journal of Earth Sciences (48) 1131-1153
Middle Eocene through Upper Miocene sedimentary and volcanic rocks of the Flint Creek basin in western Montana accumulated during a period of significant paleoclimatic change and extension across the northern Rocky Mountain Basin and Range province. Gravity modelling, borehole data, and geologic mapping from the Flint Creek basin indicate that...
Swimming and other activities: applied aspects of fish swimming performance
Theodore R. Castro-Santos
A.P. Farrell, editor(s)
2011, Book chapter, Encyclopedia of fish physiology: from genome to the environment
Human activities such as hydropower development, water withdrawals, and commercial fisheries often put fish species at risk. Engineered solutions designed to protect species or their life stages are frequently based on assumptions about swimming performance and behaviors. In many cases, however, the appropriate data to support these designs are either...
Data logging of body temperatures provides precise information on phenology of reproductive events in a free-living arctic hibernator
C. T. Williams, M.J. Sheriff, Joel A. Schmutz, F. Kohl, O. Toien, C.L. Buck, B.M. Barnes
2011, Journal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology (181) 1101-1109
Precise measures of phenology are critical to understanding how animals organize their annual cycles and how individuals and populations respond to climate-induced changes in physical and ecological stressors. We show that patterns of core body temperature (T b) can be used to precisely determine the timing of...
Inversion of ground-motion data from a seismometer array for rotation using a modification of Jaeger's method
Wu-Cheng Chi, W.H.K. Lee, J.A.D. Aston, C.J. Lin, C.-C. Liu
2011, Bulletin of the Seismological Society of America (101) 3105-3109
We develop a new way to invert 2D translational waveforms using Jaeger's (1969) formula to derive rotational ground motions about one axis and estimate the errors in them using techniques from statistical multivariate analysis. This procedure can be used to derive rotational ground motions and strains using arrayed translational data,...
Episodic soil succession on basaltic lava fields in a cool, dry environment
K.L. Vaughan, P.A. McDaniel, W.M. Phillips
2011, Soil Science Society of America Journal (75) 1462-1470
Holocene- to late Pleistocene-aged lava flows at Craters of the Moon National Monument and Preserve provide an ideal setting to examine the early stages of soil formation under cool, dry conditions. Transects were used to characterize the amount and nature of soil cover on across basaltic lava flows ranging in...
Ratios of total suspended solids to suspended sediment concentrations by particle size
W.R. Selbig, R.T. Bannerman
2011, Journal of Environmental Engineering (137) 1075-1081
Wet-sieving sand-sized particles from a whole storm-water sample before splitting the sample into laboratory-prepared containers can reduce bias and improve the precision of suspended-sediment concentrations (SSC). Wet-sieving, however, may alter concentrations of total suspended solids (TSS) because the analytical method used to determine TSS may not have included the sediment...
Nest-site fidelity and dispersal of Gyrfalcons estimated by noninvasive genetic sampling
Travis L. Booms, Sandra L. Talbot, George K. Sage, Brian J. McCaffery, Kevin G. McCracken, Philip F. Schempf
2011, Conference Paper, Condor
We used feathers from adult Gyrfalcons (Falco rusticolus) molted in breeding territories and blood samples from nestlings to document nest-site fidelity and dispersal of breeding adults and juveniles at three areas 100- 350 km apart in Yukon Delta National Wildlife Refuge, Alaska, 2003-2007. We used genotypes from seven polymorphic microsatellite...
Monitoring the Earthquake source process in North America
Robert B. Herrmann, H. Benz, C.J. Ammon
2011, Bulletin of the Seismological Society of America (101) 2609-2625
With the implementation of the USGS National Earthquake Information Center Prompt Assessment of Global Earthquakes for Response system (PAGER), rapid determination of earthquake moment magnitude is essential, especially for earthquakes that are felt within the contiguous United States. We report an implementation of moment tensor processing for application to broad,...
The magnitude distribution of earthquakes near Southern California faults
M.T. Page, D. Alderson, J. Doyle
2011, Journal of Geophysical Research B: Solid Earth (116)
We investigate seismicity near faults in the Southern California Earthquake Center Community Fault Model. We search for anomalously large events that might be signs of a characteristic earthquake distribution. We find that seismicity near major fault zones in Southern California is well modeled by a Gutenberg-Richter distribution, with no evidence...
Excess nitrogen in the U.S. environment: Trends, risks, and solutions
E.A. Davidson, M.B. David, J.N. Galloway, C.L. Goodale, R. Haeuber, J. A. Harrison, R. W. Howarth, D.B. Jaynes, R.R. Lowrance, Nolan B. Thomas, J.L. Peel, R.W. Pinder, E. Porter, C.S. Snyder, A.R. Townsend, M.H. Ward
2011, Issues in Ecology
It is not surprising that humans have profoundly altered the global nitrogen (N) cycle in an effort to feed 7 billion people, because nitrogen is an essential plant and animal nutrient. Food and energy production from agriculture, combined with industrial and energy sources, have more than doubled the amount of...
Competitive interactions between walleye (Sander vitreus) and smallmouth bass (Micropterus dolomieu) under various controlled conditions
M.R. Wuellner, B. D. S. Graeb, D.W. Willis, B.J. Galster, T.M. Selch, S. R. Chipps
2011, Journal of Freshwater Ecology (26) 299-314
The range of smallmouth bass (Micropterus dolomieu) is expanding northward, creating new interactions with native predators, including walleye (Sander vitreus). We used a series of experiments to investigate competition between walleye (WAE) and smallmouth bass (SMB) at different life stages and light conditions, identified behaviors that allowed one fish to...
Preening behavior of adult gyrfalcons tagged with backpack transmitters
T.L. Booms, P.F. Schempf, M.R. Fuller
2011, Journal of Raptor Research (45) 264-267
Radio transmitters provide data that enhance understanding of raptor biology (Walls and Kenward 2007) and are now used to answer a multitude of research questions (Meyburg and Fuller 2007). However, transmitters affect the birds that carry them (Barron et al. 2010), and it is important to document and evaluate such...
Passive immunization of Pacific herring against viral hemorrhagic septicemia.
P.K. Hershberger, J.L. Gregg, C.A. Grady, S. E. LaPatra, J. R. Winton
2011, Journal of Aquatic Animal Health (23) 140-147
The plasma of Pacific herring Clupea pallasii that survived laboratory-induced viral hemorrhagic septicemia (VHS) epizootics contained humoral substances that, when injected into naive animals, conferred passive immunity against the disease. Among groups exposed to viral hemorrhagic septicemia virus (VHSV), injection of donor plasma from VHS survivors resulted in significantly greater...
Field tracer investigation of unsaturated zone flow paths and mechanisms in agricultural soils of northwestern Mississippi, USA
K. S. Perkins, J. R. Nimmo, C.E. Rose, R.H. Coupe
2011, Journal of Hydrology (396) 1-11
In many farmed areas, intensive application of agricultural chemicals and withdrawal of groundwater for irrigation have led to water quality and supply issues. Unsaturated-zone processes, including preferential flow, play a major role in these effects but are not well understood. In the Bogue Phalia basin, an intensely agricultural area in...
Migration delays caused by anthropogenic barriers: Modeling dams, temperature, and success of migrating salmon smolts
E.A. Marschall, M. E. Mather, D.L. Parrish, G.W. Allison, J.R. McMenemy
2011, Ecological Applications (21) 3014-3031
Disruption to migration is a growing problem for conservation and restoration of animal populations. Anthropogenic barriers along migration paths can delay or prolong migrations, which may result in a mismatch with migration-timing adaptations. To understand the interaction of dams (as barriers along a migration path), seasonally changing environmental conditions, timing...
