Evaluation of ADCP apparent bed load velocity in a large sand-bed river: Moving versus stationary boat conditions
E. C. Jamieson, C. D. Rennie, R. B. Jacobson, R. D. Townsend
2011, Journal of Hydraulic Engineering (137) 1064-1071
Detailed mapping of bathymetry and apparent bed load velocity using a boat-mounted acoustic Doppler current profiler (ADCP) was carried out along a 388-m section of the lower Missouri River near Columbia, Missouri. Sampling transects (moving boat) were completed at 5- and 20-m spacing along the study section....
Random variability explains apparent global clustering of large earthquakes
A.J. Michael
2011, Geophysical Research Letters (38)
The occurrence of 5 Mw ≥ 8.5 earthquakes since 2004 has created a debate over whether or not we are in a global cluster of large earthquakes, temporarily raising risks above long-term levels. I use three classes of statistical tests to determine if the record of M ≥ 7 earthquakes...
Response to comment on "pAHs underfoot: Contaminated dust from coal-tar sealcoated pavement is widespread in the U.S."
Peter C. Van Metre, Barbara Mahler
2011, Environmental Science & Technology (45) 3187-3188
No abstract available....
Eruption dynamics of Hawaiian-style fountains: The case study of episode 1 of the Kilauea Iki 1959 eruption
W.K. Stovall, Bruce F. Houghton, H. Gonnermann, S.A. Fagents, Don Swanson
2011, Bulletin of Volcanology (73) 511-529
Hawaiian eruptions are characterized by fountains of gas and ejecta, sustained for hours to days that reach tens to hundreds of meters in height. Quantitative analysis of the pyroclastic products from the 1959 eruption of Kīlauea Iki, Kīlauea volcano, Hawai‘i, provides insights into the processes occurring during typical Hawaiian fountaining...
Occurrence of azoxystrobin, propiconazole, and selected other fungicides in US streams, 2005-2006
William A. Battaglin, Mark W. Sandstrom, Kathryn Kuivila, Dana W. Kolpin, Michael T. Meyer
2011, Water, Air, & Soil Pollution (218) 307-322
Fungicides are used to prevent foliar diseases on a wide range of vegetable, field, fruit, and ornamental crops. They are generally more effective as protective rather than curative treatments, and hence tend to be applied before infections take place. Less than 1% of US soybeans were treated with a fungicide...
Geology and petroleum potential of the Eurasia Basin
Thomas E. Moore, Janet K. Pitman
Anthony M. Spencer, A.F. Embry, Donald L. Gautier, A.V. Stoupakova, Kai Sorenson, editor(s)
2011, Book chapter, Arctic petroleum geology
The Eurasia Basin petroleum province comprises the younger, eastern half of the Arctic Ocean, including the Cenozoic Eurasia Basin and the outboard part of the continental margin of northern Europe. For the USGS petroleum assessment (CARA), it was divided into four assessment units (AUs): the Lena Prodelta AU, consisting of...
Influence of dissolved organic matter on the environmental fate of metals, nanoparticles, and colloids
George R. Aiken, Heileen Hsu-Kim, Joseph N. Ryan
2011, Environmental Science & Technology (45) 3196-3201
We have known for decades that dissolved organic matter (DOM) plays a critical role in the biogeochemical cycling of trace metals and the mobility of colloidal particles in aquatic environments. In recent years, concerns about the ecological and human health effects of metal-based engineered nanoparticles released into natural waters have...
Late Holocene geomorphic record of fire in ponderosa pine and mixed-conifer forests, Kendrick Mountain, northern Arizona, USA
S.E. Jenkins, Sieg C. Hull, D.E. Anderson, D. S. Kaufman, P. A. Pearthree
2011, International Journal of Wildland Fire (20) 125-141
Long-term fire history reconstructions enhance our understanding of fire behaviour and associated geomorphic hazards in forested ecosystems. We used 14C ages on charcoal from fire-induced debris-flow deposits to date prehistoric fires on Kendrick Mountain, northern Arizona, USA. Fire-related debris-flow sedimentation dominates Holocene fan deposition in the study area. Radiocarbon ages indicate...
Chapter 6: Detectability adjusted count models of songbird abundance
Cameron L. Aldridge, Steve E. Hanser, Scott E. Nielsen, Matthias Leu, Brian S. Cade, D. Joanne Saher, Steven T. Knick
2011, Book chapter, Sagebrush ecosystem conservation and management: Ecoregional assessment tools and models for the Wyoming Basins
Sagebrush (Artemisia spp.) steppe ecosystems have experienced recent changes resulting not only in the loss of habitat but also fragmentation and degradation of remaining habitats. As a result, sagebrush-obligate and sagebrush associated songbird populations have experienced population declines over the past several decades. We examined landscape-scale responses in occupancy and...
The contribution of competition to tree mortality in old-growth coniferous forests
A. Das, J. Battles, N.L. Stephenson, Phillip J. van Mantgem
2011, Forest Ecology and Management (261) 1203-1213
Competition is a well-documented contributor to tree mortality in temperate forests, with numerous studies documenting a relationship between tree death and the competitive environment. Models frequently rely on competition as the only non-random mechanism affecting tree mortality. However, for mature forests, competition may cease to be the primary driver...
Mechanics of flow and sediment transport in delta distributary channels
Jonathan M. Nelson, Paul J. Kinzel, Duong Duc Toan, Yasuyuki Shimizu, Richard R. McDonald
2011, Conference Paper
Predicting the planform and dimensions of a channel downstream from a confluence of two smaller channels with known sediment and water supplies is a fundamental, well-studied problem in geomorphology and engineering. An analogous but less well understood problem is found well downstream of such confluences, where large river channels split into...
Monitoring carnivore populations at the landscape scale: occupancy modelling of tigers from sign surveys
Kota Ullas Karanth, Arjun M. Gopalaswamy, Narayanarao Samba Kumar, Srinivas Vaidyanathan, James D. Nichols, Darryl I. MacKenzie
2011, Journal of Applied Ecology (48) 1048-1056
1. Assessing spatial distributions of threatened large carnivores at landscape scales poses formidable challenges because of their rarity and elusiveness. As a consequence of logistical constraints, investigators typically rely on sign surveys. Most survey methods, however, do not explicitly address the central problem of imperfect detections of animal signs in the...
The timing of tertiary metamorphism and deformation in the Albion-Raft River-Grouse Creek metamorphic core complex, Utah and Idaho
A. Strickland, E. L. Miller, J. L. Wooden
2011, Journal of Geology (119) 185-206
The Albion-Raft River-Grouse Creek metamorphic core complex of southern Idaho and northern Utah exposes 2.56-Ga orthogneisses and Neoproterozoic metasedimentary rocks that were intruded by 32-25-Ma granitic plutons. Pluton emplacement was contemporaneous with peak metamorphism, ductile thinning of the country rocks, and top-to-thewest, normal-sense shear along the Middle Mountain shear zone....
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...
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...
Understanding interaction effects of climate change and fire management on bird distributions through combined process and habitat models
Joseph D. White, Kevin J. Gutzwiller, Wylie C. Barrow, Lori Johnson-Randall, Lisa Zygo, Pamela Swint
2011, Conservation Biology (25) 536-546
Avian conservation efforts must account for changes in vegetation composition and structure associated with climate change. We modeled vegetation change and the probability of occurrence of birds to project changes in winter bird distributions associated with climate change and fire management in the northern Chihuahuan Desert (southwestern U.S.A.). We simulated...
Does small-perimeter fencing inhibit mule deer or pronghorn use of water developments?
R.T. Larsen, John Bissonette, J.T. Flinders, A.C. Robinson
2011, Journal of Wildlife Management (75) 1417-1425
Wildlife water development can be an important habitat management strategy in western North America for many species, including both pronghorn (Antilocapra americana) and mule deer (Odocoileus hemionus). In many areas, water developments are fenced (often with small-perimeter fencing) to exclude domestic livestock and feral horses. Small-perimeter exclosures could limit wild...
Modeling of hydroecological feedbacks predicts distinct classes of landscape pattern, process, and restoration potential in shallow aquatic ecosystems
Laurel G. Larsen, Judson W. Harvey
2011, Geomorphology (126) 279-296
It is widely recognized that interactions between vegetation and flow cause the emergence of channel patterns that are distinct from the standard Schumm classification of river channels. Although landscape pattern is known to be linked to ecosystem services such as habitat provision, pollutant removal, and sustaining biodiversity, the mechanisms...
Paleogene coal deposits of the Wilcox group and the Indio formation of south Texas
Robert W. Hook, Peter D. Warwick, John R. SanFilipo, Douglas J. Nichols
Peter D. Warwick, Alexander K. Karlsen, Matthew D. Merrill, Brett J. Valentine, editor(s)
2011, Book chapter, Geologic assessment of coal in the Gulf of Mexico coastal plain
Coal deposits of the undivided Wilcox Group and its southern equivalent Indio Formation (Paleogene) of south Texas are among the coal resources that are not evaluated quantitatively in the current Gulf Coastal Plain coal re-source assessment. South Texas Wilcox and Indio coals have not been extensively mined, nor have they...
Integrating occupancy modeling and interview data for corridor identification: A case study for jaguars in Nicaragua
K.A. Zeller, S. Nijhawan, R. Salom-Perez, S.H. Potosme, James E. Hines
2011, Biological Conservation (144) 892-901
Corridors are critical elements in the long-term conservation of wide-ranging species like the jaguar (Panthera onca). Jaguar corridors across the range of the species were initially identified using a GIS-based least-cost corridor model. However, due to inherent errors in remotely sensed data and model uncertainties, these corridors warrant field verification...
Atmospheric stability effects on wind fields and scalar mixing within and just above a subalpine forest in sloping terrain
Sean P. Burns, Jielun Sun, D.H. Lenschow, S.P. Oncley, B.B. Stephens, C. Yi, Dean E. Anderson, Jiawen Hu, Russell K. Monson
2011, Boundary-Layer Meteorology (138) 231-262
Air temperature T a , specific humidity q, CO2 mole fraction χ c , and three-dimensional winds were measured in mountainous terrain from five tall towers within a 1 km region encompassing a wide range of canopy densities. The measurements were sorted by a bulk Richardson number Ri b . For stable conditions, we found vertical scalar differences developed over a “transition”...
Estimating detection and density of the Andean cat in the high Andes
Juan Reppucci, Beth Gardner, Mauro Lucherini
2011, Journal of Mammalogy (92) 140-147
The Andean cat (Leopardus jacobita) is one of the most endangered, yet least known, felids. Although the Andean cat is considered at risk of extinction, rigorous quantitative population studies are lacking. Because physical observations of the Andean cat are difficult to make in the wild, we used a camera-trapping array...
Regional contamination versus regional dietary differences: Understanding geographic variation in brominated and chlorinated contaminant levels in polar bears
M.A. McKinney, R. J. Letcher, Jon Aars, E.W. Born, Marsha Branigan, R. Dietz, T.J. Evans, Geir W. Gabrielsen, D.C.G. Muir, Elizabeth L. Peacock, C. Sonne
2011, Environmental Science & Technology (45) 896-902
The relative contribution of regional contamination versus dietary differences to geographic variation in polar bear (Ursus maritimus) contaminant levels is unknown. Dietary variation between Alaska, Canada, East Greenland, and Svalbard subpopulations was assessed by muscle nitrogen and carbon stable isotope (δ15N, δ13C) and adipose fatty acid (FA) signatures relative to...
Episodic growth of a Late Cretaceous and Paleogene intrusive complex of pegmatitic leucogranite, Ruby Mountains core complex, Nevada, USA
Keith A. Howard, J. L. Wooden, C. G. Barnes, W. R. Premo, A.W. Snoke, S.-Y. Lee
2011, Geosphere (7) 1220-1248
Gneissic pegmatitic leucogranite forms a dominant component (>600 km3) of the midcrustal infrastructure of the Ruby Mountains–East Humboldt Range core complex (Nevada, USA), and was assembled and modified episodically into a batholithic volume by myriad small intrusions from ca. 92 to 29 Ma. This injection complex consists of deformed sheets...
Do well-connected landscapes promote road-related mortality?
C. Grilo, F. Ascensao, M. Santos-Reis, J.A. Bissonette
2011, European Journal of Wildlife Research (57) 707-716
Cost surface (CS) models have emerged as a useful tool to examine the interactions between landscapes patterns and wildlife at large-scale extents. This approach is particularly relevant to guide conservation planning for species that show vulnerability to road networks in human-dominated landscapes. In this study, we measured the functional connectivity...
