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Page 2555, results 63851 - 63875

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Not all publications have extents, not all extents are completely accurate
The sterile-male-release technique in Great Lakes sea lamprey management
Roger A. Bergstedt, Michael B. Twohey
2005, Report
The parasitic sea lamprey (Petromyzon marinus) has been a serious pest since its introduction into the Great Lakes, where it contributed to severe imbalances in the fish communities by selectively removing large predators (Smith 1968; Christie 1974; Schneider et al.1996). Since the 1950s, restoration and maintenance of predator-prey balance...
The Circumpolar Arctic vegetation map
Donald A. Walker, Martha K. Raynolds, F.J.A. Daniels, E. Einarsson, A. Elvebakk, W.A. Gould, A.E. Katenin, S.S. Kholod, C. J. Markon, E. S. Melnikov, N.G. Moskalenko, Stephen S. Talbot, B.A. Yurtsev, L.C. Bliss, S.A. Edlund, S.C. Zoltai, M. Wilhelm, C. Bay, G. Gudjonsson, G.V. Ananjeva, D.S. Drozdov, L.A. Konchenko, Y.V. Korostelev, O.E. Ponomareva, N.V. Matveyeva, I.N. Safranova, R. Shelkunova, A.N. Polezhaev, B.E. Johansen, H.A. Maier, D.F. Murray, Michael D. Fleming, N.G. Trahan, T.M. Charron, S.M. Lauritzen, B.A. Vairin
2005, Journal of Vegetation Science (16) 267-282
Question: What are the major vegetation units in the Arctic, what is their composition, and how are they distributed among major bioclimate subzones and countries? Location: The Arctic tundra region, north of the tree line. Methods: A photo-interpretive approach was used to delineate the vegetation onto an Advanced Very High...
Variation in fire regimes of the Rocky Mountains: Implications for avian communities and fire management
Victoria A. Saab, Hugo D. W. Powell, Natasha B. Kotliar, Karen R. Newlon
Victoria A. Saab, Hugo D. W. Powell, editor(s)
2005, Book chapter, Fire and avian ecology in North America (Studies in Avian Biology No. 30)
Information about avian responses to fire in the U.S. Rocky Mountains is based solely on studies of crown fires. However, fire management in this region is based primarily on studies of low-elevation ponderosa pine (Pinus ponderosa) forests maintained largely by frequent understory fires. In contrast to both of these trends,...
Leaf litter breakdown, microbial respiration and shredder production in metal-polluted streams
D.M. Carlisle, W.H. Clements
2005, Freshwater Biology (50) 380-390
1. If species disproportionately influence ecosystem functioning and also differ in their sensitivities to environmental conditions, the selective removal of species by anthropogenic stressors may lead to strong effects on ecosystem processes. We evaluated whether these circumstances held for several Colorado, U.S.A. streams stressed by Zn. 2. Benthic invertebrates and...
Parameter and observation importance in modelling virus transport in saturated porous media - Investigations in a homogenous system
Gilbert R. Barth, M. C. Hill
2005, Journal of Contaminant Hydrology (80) 107-129
This paper evaluates the importance of seven types of parameters to virus transport: hydraulic conductivity, porosity, dispersivity, sorption rate and distribution coefficient (representing physical-chemical filtration), and in-solution and adsorbed inactivation (representing virus inactivation). The first three parameters relate to subsurface transport in general while the last four, the sorption rate,...
Anatahan, Northern Mariana Islands: Reconnaissance geological observations during and after the volcanic crisis of spring 1990, and monitoring prior to the May 2003 eruption
S.K. Rowland, J. P. Lockwood, F. A. Trusdell, R. B. Moore, M. K. Sako, R. Y. Koyanagi, G. Kojima
2005, Journal of Volcanology and Geothermal Research (146) 26-59
Anatahan island is 9.5 km east–west by 3.5 km north–south and truncated by an elongate caldera 5 km east–west by 2.5 km north–south. A steep-walled pit crater ∼1 km across and ∼200 m deep occupies the eastern part of the caldera. The island is the summit region of a mostly...
Evidence for micronutrient limitation of biological soil crusts: Importance to arid-lands restoration
M. A. Bowker, J. Belnap, D. W. Davidson, S. L. Phillips
2005, Ecological Applications (15) 1941-1951
Desertification is a global problem, costly to national economies and human societies. Restoration of biological soil crusts (BSCs) may have an important role to play in the reversal of desertification due to their ability to decrease erosion and enhance soil fertility. To determine if there is evidence that lower fertility...
Temporal and spatial variation of early mortality syndrome in salmonids from Lakes Michigan and Huron
M. Wolgamood, J.G. Hnath, S.B. Brown, K. Moore, S.V. Marcquenski, D. C. Honeyfield, J. P. Hinterkopf, J.D. Fitzsimons, D. E. Tillitt
2005, Journal of Aquatic Animal Health (17) 65-76
To assess the extent that early mortality syndrome (EMS) impacts different Pacific salmonid stocks and the association of EMS with thiamine, we collected eggs of coho salmon Oncorhynchus kisutch from three Lake Michigan tributaries (Platte River, Thompson Creek, and Root River) in 1996-2001. We also obtained eggs of Chinook salmon...
Recent water temperature trends in the lower Klamath River, California
J.M. Bartholow
2005, North American Journal of Fisheries Management (25) 152-162
Elevated water temperatures have been implicated as a factor limiting the recovery of anadromous salmonids in the Klamath River basin. This article reviews evidence of a multi-decade trend of increasing temperatures in the lower main-stem Klamath River above the ocean and, based on model simulations, finds a high probability that...
Recent advances to obtain real - Time displacements for engineering applications
M. Çelebi
2005, Conference Paper, Proceedings of the Structures Congress and Exposition
This paper presents recent developments and approaches (using GPS technology and real-time double-integration) to obtain displacements and, in turn, drift ratios, in real-time or near real-time to meet the needs of the engineering and user community in seismic monitoring and assessing the functionality and damage condition of structures. Drift ratios...
Advantageous GOES IR results for ash mapping at high latitudes: Cleveland eruptions 2001
Yingxin Gu, William I. Rose Jr., D.J. Schneider, G.J.S. Bluth, I.M. Watson
2005, Geophysical Research Letters (32) 1-5
The February 2001 eruption of Cleveland Volcano, Alaska allowed for comparisons of volcanic ash detection using two‐band thermal infrared (10–12 μm) remote sensing from MODIS, AVHRR, and GOES 10. Results show that high latitude GOES volcanic cloud sensing the range of about 50 to 65°N is significantly enhanced. For the...
Evaluation of a prototype surface flow bypass for juvenile salmon and steelhead at the powerhouse of Lower Granite Dam, Snake River, Washington, 1996-2000
G. E. Johnson, S.M. Anglea, N.S. Adams, T.O. Wik
2005, North American Journal of Fisheries Management (25) 138-151
A surface flow bypass takes advantage of the natural surface orientation of most juvenile salmon Oncorhynchus spp. and steelhead O. mykiss by providing a route in the upper water column that downstream migrant fishes can use to pass a hydroelectric dam safely. A prototype structure, called the surface bypass and...
Hydratools, a MATLAB® based data processing package for Sontek Hydra data
M. Martini, F. L. Lightsom, C. R. Sherwood, J. Xu, J.R. Lacy, A. Ramsey, R. Horwitz
2005, Conference Paper, Proceedings of the IEEE Working Conference on Current Measurement Technology
The U.S. Geological Survey (USGS) has developed a set of MATLAB tools to process and convert data collected by Sontek Hydra instruments to netCDF, which is a format used by the USGS to process and archive oceanographic time-series data. The USGS makes high-resolution current measurements within 1.5 meters of the...
Estimation and mapping of wet and dry mercury deposition across northeastern North America
E. K. Miller, A. Vanarsdale, G.J. Keeler, A. Chalmers, L. Poissant, N.C. Kamman, R. Brulotte
2005, Ecotoxicology (14) 53-70
Whereas many ecosystem characteristics and processes influence mercury accumulation in higher trophic-level organisms, the mercury flux from the atmosphere to a lake and its watershed is a likely factor in potential risk to biota. Atmospheric deposition clearly affects mercury accumulation in soils and lake sediments. Thus, knowledge of spatial patterns...
Breeding ecology of Caspian terns at colonies on the Columbia Plateau
Michelle Antolos, D.D. Roby, K. Collis
2005, Northwest Science (78) 303-312
We investigated the breeding ecology and diet of Caspian terns on the Columbia Plateau in southeastern Washington and northeastern Oregon. We examined trends in colony size and area during 1996-2001, and estimated number of breeding pairs, nesting density, fledging success, and diet composition at selected colony sites in 2000 and...
Iterative use of the Bruggeman-Hanai-Sen mixing model to determine water saturations in sand
R.H. Johnson, E. P. Poeter
2005, Geophysics (70)
The accuracy of the Bruggeman-Hanai-Sen (BHS) mixing model has been previously demonstrated for two-material mixtures during BHS model development. Using permittivities determined from modeling ground-penetrating radar (GPR) data, the BHS model has been iteratively applied to three-material mixtures of water, sand, and a dense, nonaqueous-phase liquid (DNAPL). However, the accuracy...
Bison PRNP genotyping and potential association with Brucella spp. seroprevalence
C.M. Seabury, N.D. Halbert, P.J.P. Gogan, J.W. Templeton, J.N. Derr
2005, Animal Genetics (36) 104-110
The implication that host cellular prion protein (PrPC) may function as a cell surface receptor and/or portal protein for Brucella abortus in mice prompted an evaluation of nucleotide and amino acid variation within exon 3 of the prion protein gene (PRNP) for six US bison populations. A non-synonymous single nucleotide...