G.T. Auble
2006, Wetlands (26) 284-286
No abstract available....
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Publication Extents
Not all publications have extents, not all extents are completely accurateThomas J. (compiler) O'Shea
2006, Open-File Report 2006-1336
The U.S. Geological Survey’s Fort Collins Science Center ("the Center") has been a nucleus of research, technology development, and associated scientific activities within the Department of the Interior for more than 30 years. The Center’s historical activities are deeply rooted in federal biological resources research and its supporting disciplines, particularly...
Bernard A. Chouet
2006, Géosciences (2006) 56-63
At an active volcano, Very-Long-Period (VLP) seismicity (with typical periods in the range 2-100 s) reflects pressure fluctuations resulting from unsteady mass transport in the sub-surface plumbing system, and hence provides a glimpse of the internal dynamics of the volcanic edifice. Understanding the fundamental fluid-flow mechanisms involved in the...
Linda Zeigenfuss
2006, Open-File Report 2006-1122
The majority of the elk (Cervus elaphus) population of Rocky Mountain National Park in Colorado summer in the park’s high-elevation alpine and subalpine meadows and willow krummholz. The park’s population of white-tailed ptarmigan (Lagopus leucurus altipetens) depends on both dwarf and krummholz willows for food and cover. Concern about the...
K.J. Hartman, F.J. Margraf
2006, Fisheries Management and Ecology (13) 121-130
Condition indices are often used as surrogates of fish health, growth, and feeding and to compare ecological well-being among fish populations. In an effort to identify easily measured indices, growth and food consumption were compared with gonadal-somatic index, liver-somatic index (LSI), fat-somatic index and relative weight (Wr) for ages 1-3...
J.J. Fontaine, T. E. Martin
2006, American Naturalist (168) 811-818
The ability of nest predation to influence habitat settlement decisions in birds is widely debated, despite its importance in limiting fitness. Here, we experimentally manipulated nest predation risk across a landscape and asked the question, do migratory birds assess and respond to variation in nest predation risk when choosing breeding...
L. P. Gough, R. G. Eppinger, Paul H. Briggs, S. Giles
2006, Arctic, Antarctic, and Alpine Research (38) 522-529
We report on the geochemistry of soil and bryophyte-laden sediment and on the biogeochemistry of willows growing in an undisturbed volcanogenic massive sulfide deposit in the Alaska Range ecoregion of east-central Alaska. We also describe an unusual bryophyte assemblage found growing in the acidic metal-rich waters that drain the area....
W.U. Savage, S.P. Nishenko, D.G. Honegger, L. Kempner Jr.
2006, Conference Paper, Electrical Transmission Line and Substation Structures: Structural Reliability in a Changing World - Proceedings of the 2006 Electrical Transmission Conference
Electric power utilities are familiar with and skilled in preparing for and responding to almost-routine natural hazard events such as strong wind and ice storms and seasonal floods, as well as intentional human acts such as vandalism. Recent extreme weather (hurricanes Katrina and Rita), extremely destructive international earthquakes (in Sumatra...
G.W. Su, T.J. Kneafsey, T.A. Ghezzehei, P.J. Cook, B.D. Marshall
2006, Conference Paper, Proceedings of the 11th International High Level Radioactive Waste Management Conference, IHLRWM
The "Drift Shadow" is defined as the relatively drier region that forms below subsurface cavities or drifts in unsaturated rock. Its existence has been predicted through analytical and numerical models of unsaturated flow. However, these theoretical predictions have not been demonstrated empirically to date. In this project we plan to...
R.L. Bon, K.A. Krahulec
2006, Mining Engineering (58) 116-122
The value of Utah's mineral production in 2005 was estimated to be a record $3.58 billion. This was $1.26 billion higher than the revised value of $2.32 billion for 2004. All major industry segments gained in value in 2005. In the value of nonfuel mineral production, Utah ranked fourth. The...
V. Graizer
2006, Bulletin of the Seismological Society of America (96) 2090-2102
Most instruments used in seismological practice to record ground motion are pendulum seismographs, velocigraphs, or accelerographs. In most cases it is assumed that seismic instruments are only sensitive to the translational motion of the instrument's base. In this study the full equation of pendulum motion, including the inputs of rotations...
Timothy Loher, Andrew C. Seitz
2006, Marine Ecology Progress Series (317) 259-271
Pop-up archival transmitting (PAT) tags were used to study the fall migration of halibut in the Gulf of Alaska (GOA). We tagged 6 Pacific halibut Hippoglossus stenolepis on summer feeding grounds in the eastern GOA and another 6 in the western GOA from June 13 to August 6, 2002. The...
M.K. Laubhan, T.L. Shaffer
2006, Wetlands (26) 69-78
Cirsium arvense and Lepidium latifolium are species that can aggressively invade wetland margins and potentially reduce biodiversity and alter ecosystem function. Although expansion of these species primarily occurs via rhizomatous growth, seeds are thought to be important in initial establishment. We conducted this study to investigate differences in seed germination...
J.E. Havel, J.L. Graham
2006, Archiv fur Hydrobiologie (167) 245-264
During its invasion of North America, the exotic Daphnia lumholtzi has rapidly colonized numerous reservoirs, natural lakes, and large rivers. In the current study, we examine the overlap between D. lumholtzi and native Daphnia species through analysis of two data sets: co-occurrence in reservoirs of the south-central United States and...
L. Zambrano, E. Vazquez-Dominguez, D. Garcia-Bedoya, W.F. Loftus, J.C. Trexler
2006, Ichthyological Exploration of Freshwaters (17) 193-206
We evaluated the relationship between limnetic characteristics and fish community structure (based on species richness, abundance and individual size) in contrasting but interconnected inland aquatic habitats of freshwater karstic wetlands in the Yucatan peninsula, Mexico. In the western hemisphere, freshwater karstic wetlands are found in south-eastern Mexico, northern Belize, western...
A. Shakal, H. Haddadi, V. Graizer, K. Lin, M. Huang
2006, Bulletin of the Seismological Society of America (96)
The 2004 Parkfield, California, earthquake was recorded by an extensive set of strong-motion instruments well positioned to record details of the motion in the near-fault region, where there has previously been very little recorded data. The strong-motion measurements obtained are highly varied, with significant variations occurring over only a few...
S. Gutreuter, J.M. Vallazza, B.C. Knights
2006, Canadian Journal of Fisheries and Aquatic Sciences (63) 2418-2433
We provide the first evidence for chronic effects of disturbance by commercial vessels on the spatial distribution and abundance of fishes in the channels of a large river. Most of the world's large rivers are intensively managed to satisfy increasing demands for commercial shipping, but little research has been conducted...
D.W. Bruno, B. Nowak, Diane G. Elliott
2006, Bulletin of the European Association of Fish Pathologists (26) 55-56
Pathology occurring during reproduction and larval development represents an important part of the life cycle of fish, and the diseases that affect eggs and larvae often result in significant losses. However, mortality during this period is frequently ignored or poorly researched as the temptation is to replace the losses rather...
J.J. Lawler, T.C. Edwards Jr.
2006, Conference Paper, Condor
The recognition of the importance of spatial scale in ecology has led many researchers to take multiscale approaches to studying habitat associations. However, few of the studies that investigate habitat associations at multiple spatial scales have considered the potential effects of cross-scale correlations in measured habitat variables. When cross-scale correlations...
Jun-Ichi Kimura, Thomas W. Sisson, Natsuko Nakano, Michelle L. Coombs, Peter W. Lipman
2006, Journal of Volcanology and Geothermal Research (151) 51-72
Submarine lavas recovered from the Hilina bench region, offshore Kilauea, Hawaii Island provide information on ancient Kilauea volcano and the geochemical components of the Hawaiian hotspot. Alkalic lavas, including nephelinite, basanite, hawaiite, and alkali basalt, dominate the earliest stage of Kilauea magmatism. Transitional basalt pillow lavas are an intermediate phase,...
J.M. Fine, S.P. Sisler, L.A. Vrieze, W.D. Swink, P.W. Sorensen
2006, Journal of Great Lakes Research (32) 832-838
Pheromonally-mediated trapping is currently being developed for use in sea lamprey control in the Laurentian Great Lakes. To identify and test lamprey pheromones a practical procedure was needed to isolate relatively large quantities of pheromone from lamprey holding water. The present study developed such a technique. It employs Amberlite XAD7HP,...
P. Liu, R.J. Archuleta, S.H. Hartzell
2006, Bulletin of the Seismological Society of America (96) 2118-2130
We present a new method for calculating broadband time histories of ground motion based on a hybrid low-frequency/high-frequency approach with correlated source parameters. Using a finite-difference method we calculate low- frequency synthetics (< ∼1 Hz) in a 3D velocity structure. We also compute broadband synthetics in a 1D velocity model...
J. Turner, H.-J. Albrechtsen, M. Bonell, J.-P. Duguet, B. Harris, R. Meckenstock, K. McGuire, R. Moussa, N. Peters, H.H. Richnow, B. Sherwood-Lollar, S. Uhlenbrook, Lanen H. van
2006, Hydrological Processes (20) 205-213
A summary is provided of the first of a series of proposed Integrated Science Initiative workshops supported by the UNESCO International Hydrological Programme. The workshop brought together hydrologists, environmental chemists, microbiologists, stable isotope specialists and natural resource managers with the purpose of communicating new ideas on ways to assess microbial...
T.C. Edwards Jr., D.R. Cutler, N.E. Zimmermann, L. Geiser, Gretchen G. Moisen
2006, Ecological Modelling (199) 132-141
We evaluated the effects of probabilistic (hereafter DESIGN) and non-probabilistic (PURPOSIVE) sample surveys on resultant classification tree models for predicting the presence of four lichen species in the Pacific Northwest, USA. Models derived from both survey forms were assessed using an independent data set (EVALUATION). Measures of accuracy as gauged...
T. Mogi, H. Ito, H. Kaieda, K. Kusunoki, R. W. Saltus, D.V. Fitterman, S. Okuma, T. Nakatsuka
2006, Conference Paper, Eos
[No abstract available]...