Assessing browse trend at the landscape level Part 1: Preliminary steps and field survey
R.B. Keigley, M.R. Frisina, C.W. Fager
2002, Rangelands (24) 28-33
Woody plants are an important component of rangeland habitat, providing food and shelter for animals that range in size from moose to warblers to insects. Because of this importance, land managers are paying increased attention to browse trends. In this two-part article, we describe how browse trend is assessed at...
Productivity responses of Acer rubrum and Taxodium distichum seedlings to elevated CO2 and flooding
C.D. Vann, J.P. Megonigal
2002, Environmental Pollution (116)
Elevated levels of atmospheric CO2 are expected to increase photosynthetic rates of C3 tree species, but it is uncertain whether this will result in an increase in wetland seedling productivity. Separate short-term experiments (12 and 17 weeks) were performed on two wetland tree species, Taxodium distichum and Acer rubrum, to...
Operating the EOSDIS at the land processes DAAC managing expectations, requirements, and performance across agencies, missions, instruments, systems, and user communities
T. A. Kalvelage
Barnes W.L., editor(s)
2002, Conference Paper
NASA developed the Earth Observing System (EOS) during the 1990'S. At the Land Processes Distributed Active Archive Center (LP DAAC), located at the USGS EROS Data Center, the EOS Data and Information System (EOSDIS) is required to support heritage missions as well as Landsat 7, Terra, and Aqua. The original...
Alien annual plants and their relationships to fire and biotic change in Sonoran Desertscrub
T. C. Esque, C.R. Schwalbe
B. Tellman, editor(s)
2002, Book chapter, Invasive exotic species in the Sonoran region
No abstract available....
Isolation of thiaminase-positive bacteria from alewife
D. C. Honeyfield, J. P. Hinterkopf
2002, Transactions of the American Fisheries Society (131) 171-175
Evidence pointing to thiamine deficiency as a primary factor in early mortality syndrome in feral salmonids from the Great Lakes and New York's Finger Lakes continues to mount. Such deficiency is believed to be the result of the consumption of nontraditional forage fish, such as alewife Alosa pseudoharengus, that contain thiaminase...
Reconnaissance-level assessment of water quality near Flandreau, South Dakota
Bryan D. Schaap
2002, Open-File Report 2002-474
This report presents water-quality data that have been compiled and collected for a reconnaissance-level assessment of water quality near Flandreau, South Dakota. The investigation was initiated as a cooperative effort between the U.S. Geological Survey and the Flandreau Santee Sioux Tribe. Members of the Flandreau Santee Sioux Tribe have expressed concern...
Observations of comet 19P/Borrelly by the miniature integrated camera and spectrometer aboard deep space 1
Laurence A. Soderblom, T.L. Becker, G. Bennett, D. C. Boice, D.T. Britt, R. H. Brown, B. J. Buratti, C. Isbell, B. Giese, T. Hare, M.D. Hicks, Elpitha Howington-Kraus, Randolph L. Kirk, M. Lee, R.M. Nelson, J. Oberst, T.C. Owen, M.D. Rayman, B.R. Sandel, S. A. Stern, N. Thomas, R.V. Yelle
2002, Science (296) 1087-1091
The nucleus of the Jupiter-family comet 19P/Borrelly was closely observed by the Miniature Integrated Camera and Spectrometer aboard the Deep Space 1 spacecraft on 22 September 2001. The 8-kilometer-long body is highly variegated on a scale of 200 meters, exhibiting large albedo variations (0.01 to 0.03) and complex geologic relationships....
Seismic evidence for a tilted mantle plume and north-south mantle flow beneath Iceland
Y. Shen, S.C. Solomon, I. Th Bjarnason, G. Nolet, W. J. Morgan, R. M. Allen, K. Vogfjord, S. Jakobsdottir, R. Stefansson, B.R. Julian, G.R. Foulger
2002, Earth and Planetary Science Letters (197) 261-272
Shear waves converted from compressional waves at mantle discontinuities near 410- and 660-km depth recorded by two broadband seismic experiments in Iceland reveal that the center of an area of anomalously thin mantle transition zone lies at least 100 km south of the upper-mantle low-velocity anomaly imaged tomographically beneath the...
Energy resource potential of natural gas hydrates
T. S. Collett
2002, American Association of Petroleum Geologists Bulletin (86) 1971-1992
The discovery of large gas hydrate accumulations in terrestrial permafrost regions of the Arctic and beneath the sea along the outer continental margins of the world's oceans has heightened interest in gas hydrates as a possible energy resource. However, significant to potentially insurmountable technical issues must be resolved be...
Movement and habitat use of green sturgeon Acipenser medirostris in the Rogue River, Oregon, USA
D.L. Erickson, J.A. North, J.E. Hightower, J. Weber, L. Lauck
2002, Journal of Applied Ichthyology (18) 565-569
Green sturgeon (Acipenser medirostris) movement patterns and habitat use within the Rogue River, Oregon were evaluated using radio telemetry. Nineteen specimens ranging from 154 to 225 cm total length were caught by gill netting and tagged with radio transmitters during May-July 2000. One tagged green sturgeon was verified as a...
Population structure of Pacific Common Eiders breeding in Alaska
Margaret R. Petersen, Paul L. Flint
2002, Condor (104) 780-787
We used satellite telemetry to study the migration routes and wintering areas of two allopatric breeding populations of Pacific Common Eiders (Somateria mollissima v-nigrum) in Alaska: the Yukon-Kuskokwim Delta, and the western Beaufort Sea coast. Only 6% (2 of 36) of females wintered within the wintering area of the other...
Modified Biot-Gassmann theory for calculating elastic velocities for unconsolidated and consolidated sediments
Myung W. Lee
2002, Marine Geophysical Research (23) 403-412
The classical Biot-Gassmann theory (BGT) generally overestimates shear-wave velocities of water-saturated sediments. To overcome this problem, a new theory is developed based on BGT and on the velocity ratio as a function of G(1−φ)n, where φ is porosity and n and G are constants. Based on laboratory data measured at ultrasonic frequencies, parameters for the...
Raw materials and technology fuel U.S. economic growth
T.D. Kelly
2002, Mining Engineering (54) 17-21
In 1900, the average U.S. citizen's average life span was 47 years. He traveled about 1,900 km (1,200 miles) in a lifetime and resided in a home with an icebox for food storage and oil or gas for lighting. He communicated by mail, telegraph and crude telephones with limited availability...
Alien invasions in aquatic ecosystems: Toward an understanding of brook trout invasions and potential impacts on inland cutthroat trout in western North America
Jason B. Dunham, Susan B. Adams, Robert Schroeter, Douglas C. Novinger
2002, Reviews in Fish Biology and Fisheries (12) 373-391
Experience from case studies of biological invasions in aquatic ecosystems has motivated a set of proposed empirical “rules” for understanding patterns of invasion and impacts on native species. Further evidence is needed to better understand these patterns, and perhaps contribute to a useful predictive theory of invasions. We reviewed the...
Geochemistry of fluid phases and sediments: Relevance to hydrothermal circulation in Middle Valley, ODP Legs 139 and 169
J. M. Gieskes, Bernd R. T. Simoneit, Wayne C. Shanks III, W.D. Goodfellow, R.H. James, P.A. Baker, J.-I. Ishibashi
2002, Applied Geochemistry (17) 1381-1399
Geochemical and isotopic studies of pore fluids and solid phases recovered from the Dead Dog and Bent Hill hydrothermal sites in Middle Valley (Ocean Drilling Program Leg 169) have been compared with similar data obtained previously from these sites during Ocean Drilling Program Leg 139. Although generally the hydrothermal systems...
Antimicrobial residues in animal waste and water resources proximal to large-scale swine and poultry feeding operations
E.R. Campagnolo, K.R. Johnson, A. Karpati, C.S. Rubin, D.W. Kolpin, M. T. Meyer, J. Emilio Esteban, R.W. Currier, K. Smith, K.M. Thu, M. McGeehin
2002, Science of the Total Environment (299) 89-95
Expansion and intensification of large-scale animal feeding operations (AFOs) in the United States has resulted in concern about environmental contamination and its potential public health impacts. The objective of this investigation was to obtain background data on a broad profile of antimicrobial residues in animal wastes and surface water and...
Interpretation of K-Ar dates of illitic clays from sedimentary rocks aided by modeling
J. Srodon, Norbert Clauer, D.D.D. Eberl
2002, American Mineralogist (87) 1528-1535
K-Ar dates of illitic clays from sedimentary rocks may contain "mixed ages," i.e., may have ages that are intermediate between the ages of end-member events. Two phenomena that may cause mixed ages are: (1) long-lasting reaction during the burial illitization of smectite: and (2) physical mixing of detrital and diagenetic...
Collaborative approaches to the evolution of migration and the development of science-based conservation in shorebirds
Brian A. Harrington, S. Brown, James Corven, Jonathan Bart
2002, The Auk (119) 914-921
Shorebirds are among the most highly migratory creatures on earth. Both the study of their ecology and ongoing efforts to conserve their populations must reflect this central aspect of their biology. Many species of shorebirds use migration and staging sites scattered throughout the hemisphere to complete their annual migrations between...
Impact of sensor's point spread function on land cover characterization: Assessment and deconvolution
C. Huang, J.R.G. Townshend, S. Liang, S.N.V. Kalluri, R.S. DeFries
2002, Remote Sensing of Environment (80) 203-212
Measured and modeled point spread functions (PSF) of sensor systems indicate that a significant portion of the recorded signal of each pixel of a satellite image originates from outside the area represented by that pixel. This hinders the ability to derive surface information from satellite images on a per-pixel basis....
Landscapes to riverscapes: bridging the gap between research and conservation of stream fishes
Kurt D. Fausch, Christian E. Torgersen, Colden V. Baxter, Hiram W. Li
2002, BioScience (52) 483-498
Rivers and streams, by their very nature long ribbons of aquatic habitat, are inherently difficult to study. Approaching the banks of a flowing-water (lotic) system, one can see only a short fragment of the entire stream, from one bend to another, and can gain little appreciation for important features that lie...
Information science and technology developments within the National Biological Information Infrastructure
Mike Frame, Gladys Cotter, Lisa Zolly, Janice Little
2002, Science and Technology Libraries (23) 59-72
Whether your vantage point is that of an office window or a national park, your view undoubtedly encompasses a rich diversity of life forms, all carefully studied or managed by some scientist, resource manager, or planner. A few simple calculations-the number of species, their interrelationships, and the many researchers studying...
Factors influencing the nitrification efficiency of fluidized bed filter with a plastic bead medium
S. I. Sandu, G. D. Boardman, B.J. Watten, B. L. Brazil
2002, Aquacultural Engineering (26) 41-59
The performance of fluidized bed nitrification filters charged with 2 ?? 4 ABS plastic beads (specific gravity 1.06) was evaluated. Three unique bed-height to diameter ratios were established, in triplicate, using column diameters of 12.7, 15.2 and 17.8 cm. Filters received water spiked with recycled nutrients and ammonia (TAN), from...
Development of a benthic macroinvertebrate index to assess biological integrity the Ohio River
J.M. Applegate, P. C. Baumann, E.E. Emery
2002, Conference Paper, Ohio Journal of Science
No abstract available at this time...
Sierra Nevada global change and fire research
N. Stephenson
2002, People, Land, and Water (8) 18
No abstract available at this time...
Population dynamics of tule elk at point Reyes National Seashore, California
J. A. Howell, G. C. Brooks, M. Semenoff-Irving, C. Greene
2002, Journal of Wildlife Management (66) 478-490
The presence of locally abundant wildlife raises questions about natural regulation and ecological consequences of overpopulation. We sought to establish precise information about population size, structure, and productivity to examine the role of natural regulation in a closed tule elk (Cervus elaphus nannodes) population at Point Reyes National Seashore, California,...
