H.D. Chamblin, W.I. Boarman
2004, Report
No abstract available at this time...
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Page 2758, results 68926 - 68950
Publication Extents
Not all publications have extents, not all extents are completely accurateKevin M. Hartke, Gary R. Hepp
2004, Journal of Wildlife Management (68) 84-93
Female wood ducks (Aix sponsa) feed primarily on plant foods in the prelaying period and switch to a diet of mostly invertebrates during egg production. If nutrient acquisition is habitat-specific, then selection and use of habitats may differ between these reproductive stages. A better understanding of these processes is needed...
J.L. Macias, L. Capra, K. M. Scott, J.M. Espindola, A. Garcia-Palomo, J. E. Costa
2004, Geological Society of America Bulletin (116) 233-246
The eruptions of El Chichón between 28 March and 4 April 1982 produced a variety of pyroclastic deposits. The climactic phase, on 3 April at 07:35 (4 April at 01:35 GMT), destroyed the central andesitic dome and fed pyroclastic surges and flows that dammed nearby drainages, including the Magdalena River....
G. D. Jones, F. F. Whitaker, P. L. Smart, W. E. Sanford
2004, American Journal of Science (304) 250-284
Density-driven seawater circulation may occur in carbonate platforms due to geothermal heating and / or reflux of water of elevated salinity. In geothermal circulation lateral contrasts in temperature between seawater and platform groundwaters warmed by the geothermal heat flux result in upward convective flow, with colder seawater drawn into the...
Jennifer C. Cavanaugh, Roger J. Haro, Shane N. Jones
2004, Journal of the North American Benthological Society (23) 297-308
Larval Glossosoma intermedium are dominant benthic grazers that often deplete their food resources (periphyton). We observed G. Intermedium grazing periphyton from conspecific cases, a possible result of limited resources on stream cobbles, and we hypothesized that case grazing increases when periphyton resources become scarce. This hypothesis was tested by monitoring...
M. Fornwall, L. Loope
2004, Weed Science (52) 854-856
The need for coordinated regional and global electronic databases to assist prevention, early detection, rapid response, and control of biological invasions is well accepted. The Pacific Basin Information Node (PBIN), a node of the National Biological Information Infrastructure, has been increasingly engaged in the invasive species enterprise since its establishment...
W.S. Kirk
2004, Minerals and Energy - Raw Materials Report (19) 16-27
China has become the leading iron ore consuming nation, and, based on recent steel production capacity increases and plans for more, its consumption will almost certainly to continue to grow. China's iron ore industry, however, faces a number of problems. China's iron ore is low-grade, expensive to process, and its...
K. Hirata, Y. Tanioka, K. Satake, S. Yamaki, E.L. Geist
2004, Earth, Planets and Space (56) 367-372
We estimate the tsunami source area of the 2003 Tokachi-oki earthquake (Mw 8.0) from observed tsunami travel times at 17 Japanese tide gauge stations. The estimated tsunami source area (∼ 1.4 × 104 km2) coincides with the western-half of the ocean-bottom deformation area (∼2.52 × 104 km2) of the 1952 Tokachi-oki...
D.W. Kolpin, M. Skopec, M. T. Meyer, E. T. Furlong, S.D. Zaugg
2004, Science of the Total Environment (328) 119-130
During 2001, 76 water samples were collected upstream and downstream of select towns and cities in Iowa during high-, normal- and low-flow conditions to determine the contribution of urban centers to concentrations of pharmaceuticals and other organic wastewater contaminants (OWCs) in streams under varying flow conditions. The towns ranged in...
R.J. Blakely, M.H. Beeson, K. Cruikshank, R.E. Wells, Aaron H. Johnson, K. Walsh
2004, Bulletin of the Seismological Society of America (94) 1402-1409
A high-resolution gravity survey through the Tualatin Mountains (Portland Nills) west of downtown Portland exhibits evidence of faults previously identified from surface geologic and aeromagnetic mapping. The gravity survey was conducted in 1996 along the 4.5-km length of a twin-bore tunnel, then under construction and now providing light-rail service between...
R. Milici
2004, Conference Paper, 2004 SME Annual Meeting Preprints
Current federal and State coal assessments estimate resources in the ground, resources available for mining, and economically recoverable resources. None of these assessments predict the amount of coal that may be produced from an assessed area in the near future (???20 years). Predictive assessments of coal production would be based...
J.M. Besser, W. G. Brumbaugh, N.E. Kemble, T.W. May, C.G. Ingersoll
2004, Environmental Science & Technology (38) 6210-6216
We evaluated the influence of sediment characteristics, acid-volatile sulfide (AVS) and organic matter (OM), on the toxicity of chromium (Cr) in freshwater sediments. We conducted chronic (28-42-d) toxicity tests with the amphipod Hyalella azteca exposed to Cr(VI) and Cr(III) in water and in spiked sediments. Waterborne Cr(VI) caused reduced survival...
D.C.G. Muir, D.M. Whittle, D. S. De Vault, C.R. Bronte, H. Karlsson, S. Backus, C. Teixeira
2004, Journal of Great Lakes Research (30) 316-340
The bioaccumulation and biotransformation of toxaphene was examined in the food webs of Lake Superior and Siskiwit Lake (Isle Royale) using congener specific analysis as well as stable isotope ratios of carbon and nitrogen to characterize food webs. Toxaphene concentrations (calculated using technical toxaphene) in lake trout (Salvelinus namaycush) from...
J.C. Senar, M.J. Conroy
2004, Animal Biodiversity and Conservation (27) 133-146
Disease is one of the evolutionary forces shaping populations. Recent studies have shown that epidemics like avian pox, malaria, or mycoplasmosis have affected passerine population dynamics, being responsible for the decline of some populations or disproportionately killing males and larger individuals and thus selecting for specific morphotypes. However, few studies...
C.O. Ostberg, S.L. Slatton, R. J. Rodriguez
2004, Molecular Ecology (13) 2773-2788
Hybridization between sympatric species provides unique opportunities to examine the contrast between mechanisms that promote hybridization and maintain species integrity. We surveyed hybridization between sympatric coastal steelhead (Oncorhynchus mykiss irideus) and coastal cutthroat trout (O. clarki clarki) from two streams in Washington State, Olsen Creek (256 individuals sampled) and Jansen...
P. J. van Mantgem, N.L. Stephenson
2004, Canadian Journal of Forest Research (34) 2394-2398
We assess the potential of increment coring, a common method for measuring tree ages and growth, to contribute to mortality. We used up to 21 years of annual censuses from two cored and two uncored permanent plots in the Sierra Nevada of California, to detect changes in mortality rates 12...
T. S. Smith, B.A. Johnson
2004, Arctic (57) 160-165
Brown bear-human interactions were observed in 1993, 1995, and 1997 at Kulik River in Katmai National Park and Preserve, Alaska. We analyzed these interactions using survival analysis, creating survival curves for the time that bears remained on the river in the presence, and absence, of human activity. Bear-only survival curves...
E.H. Jorgensen, O. Aas-Hansen, A.G. Maule, J.E.T. Strand, M.M. Vijayan
2004, Comparative Biochemistry and Physiology, Part C: Toxicology & Pharmacology (138) 203-212
The impacts of polychlorinated biphenyl (PCB) exposure on smoltification and subsequent seawater performance were investigated in hatchery-reared, anadromous Arctic charr (Salvelinus alpinus). The fish were subjected to a 2-month summer seawater residence, after which they were orally dosed with 0 (Control, C), 1 (Low Dose, LD) or 100 mg Aroclor...
Tom S. Smith, Steven T. Partridge, John W. Schoen
2004, Canadian Field-Naturalist (118) 247-250
We describe several encounters between Brown Bears (Ursus arctos) and Gray Wolves (Canis lupus) that were observed at Katmai National Park and Preserve in southwest Alaska. Katmai Brown Bears and Gray Wolves were observed interacting in a variety of behavioral modes that ranged from agonistic to tolerant. These observations provide...
G. Montenegro, R. Ginocchio, A. Segura, J.E. Keely, M. Gomez
2004, Conference Paper, Revista Chilena de Historia Natural
Wildfires resulting from thunderstorms are common in some Mediterranean-climate regions, such as southern California, and have played an important role in the ecology and evolution of the flora. Mediterranean-climate regions are major centers for human population and thus anthropogenic impacts on fire regimes may have important consequences on these plant...
L.L. Turner, M.P. Brown, D. Chambers, C.A. Davis, J. Diehl, C.S. Hitchcock, T.L. Holzer, R.L. Nigbor, C. Plumb, C. Real, M. Reimer, J.H. Steidl, J.I. Sun, J. C. Tinsley, D. Vaughn
Yegian M.K.Kavazanjian E., editor(s)
2004, Conference Paper, Geotechnical Special Publication
This paper presents the findings and recommendations of the User Scenario Work Group (USWG) in identifying a baseline of current practices within the geo-professional community and prioritizing desired functional requirements in the development of a comprehensive geotechnical information management system. This work was conducted as an initial phase of a...
P.-Y. Henry, R.E. Bennetts, Y. Kayser, H. Hafner
2004, Waterbirds (27) 480-482
When studying breeding dispersal with marked individuals, manipulation-induced disturbance should not affect movement patterns. As part of a study on the Little Egret (Egretta garzetta), we tested whether the capture of breeding adults at their nest and handling (i.e., disturbance) increased their probability to move to a new colony in...
D.W. Anning
Sehlke G.Hayes D.F.Stevens D.K., editor(s)
2004, Conference Paper, Proceedings of the 2004 World Water and Environmetal Resources Congress: Critical Transitions in Water and Environmetal Resources Management
The evaluation of uncertainty in low-flow data collected from three streamflow-gaging stations on the upper Verde River, Arizona, was presented. In downstream order, the stations are Verde River near Paulden, Verde River near Clarkdale, and Verde River near Camp Verde. A monitoring objective of the evaluation was to characterize discharge...
S. Zhang, Y. Xu, J. Xia
Chen C.Xia J., editor(s)
2004, Conference Paper, Progress in Environmental and Engineering Geophysics: Proceedings of the International Conference on Environmental and Engineering Geophysics, ICEEG 2004
Horizontal stacking plays a crucial role for modern seismic data processing, for it not only compresses random noise and multiple reflections, but also provides a foundational data for subsequent migration and inversion. However, a number of examples showed that random noise in adjacent traces exhibits correlation and coherence. The average...
R. J. Varga, J. E. Faulds, L.W. Snee, S. S. Harlan, L. Bettison-Varga
2004, Tectonics (23)
Recent studies demonstrate that rifts are characterized by linked tilt domains, each containing a consistent polarity of normal faults and stratal tilt directions, and that the transition between domains is typically through formation of accommodation zones and generally not through production of throughgoing transfer faults. The mid-Miocene Black Mountains accommodation...