Ontogenetic behavior and migration of Atlantic sturgeon, Acipenser oxyrinchus oxyrinchus, and shortnose sturgeon, A. brevirostrum, with notes on social behavior
B. Kynard, Martin Horgan
2002, Environmental Biology of Fishes (63) 137-150
Ontogenetic behavior of Hudson River Atlantic sturgeon and Connecticut River shortnose sturgeon early life intervals were similar during laboratory observations. After hatching, free embryos were photonegative and sought cover. When embryos developed into larvae, fish left cover, were photopositive, and initiated downstream migration. Free embryos may remain at the spawning...
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...
Spatial and statistical differences between 1:250,000- and 1:24,000-scale digital soil databases
K. E. Juracek, D.M. Wolock
2002, Journal of Soil and Water Conservation (57) 89-94
In this study, 1:250,000- and 1:24,000-scale digital soil databases for Kansas were compared statistically and spatially. The soil attributes used in this comparison were soil permeability, percent clay, and hydrologic group. Results indicate that, although the two databases were correlated, the potential exists for substantial site-specific variability between them. The...
Trends in midwinter counts of bald eagles in the contiguous United States, 1986-2000
Karen Steenhof, Laura Bond, Kirk K. Bates, Lynda L. Leppert
2002, Bird Populations (6) 21-32
We estimated statewide, regional, and national trends in counts of Bald Eagles (Haliaeetus leucocephalus) along selected routes in the contiguous United States during midwinter, 1986-2000. Each January, several hundred observers collected data as part of a survey initiated by the National Wildlife Federation in 1979. To analyze these data, we...
Space use, migratory connectivity, and population segregation among Willets breeding in the western Great Basin
S. M. Haig, L.W. Oring, P.M. Sanzenbacher, O.W. Taft
2002, Condor (104) 620-630
Western Willets (Catoptrophorus semipalmatus inornatus) were banded (n = 146 breeding adults and chicks) and radio-marked (n = 68 adults) at three western Great Basin wetland complexes to determine inter- and intraseasonal space use and movement patterns (primarily in 1998 and 1999). Birds were then tracked to overwintering sites where...
Parental care in Tundra Swans during the pre-fledgling period
Susan L. Earnst
2002, Waterbirds (25) 268-277
Among studies that have quantified the care of precocial young, few have investigated forms of parental care other than vigilance. During the pre-fledging period, Tundra Swan (Cygnus columbianus columbianus) parents provided simultaneous biparental care by foraging near each other and their cygnets, and cygnets spent more time foraging during bouts...
Absolute irradiance of the Moon for on-orbit calibration
T.C. Stone, H. H. Kieffer
Barnes W.L., editor(s)
2002, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
The recognized need for on-orbit calibration of remote sensing imaging instruments drives the ROLO project effort to characterize the Moon for use as an absolute radiance source. For over 5 years the ground-based ROLO telescopes have acquired spatially-resolved lunar images in 23 VNIR (Moon diameter ???500 pixels) and 9 SWIR...
Subsurface fluid pressures from drill-stem tests, Uinta Basin, Utah
P. H. Nelson
2002, Mountain Geologist (39) 17-26
High fluid pressures are known to be associated with oil and gas fields in the Uinta Basin, Utah. Shut-in pressure measurements from drill-stem tests show how pressure varies with depth and by area within the basin. The data base used in this report incorporates over 2,000 pressure measurements from drill-stem...
Leaf cellulose δD and δ18O trends with elevation differ in direction among co-occurring, semiarid plant species
Vallery J. Terwilliger, Julio L. Betancourt, Steven W. Leavitt, Peter K. Van De Water
2002, Geochimica et Cosmochimica Acta (66) 3887-3900
The potential to reconstruct paleoclimate from analyses of stable isotopes in fossil leaf cellulose could be enhanced by adequate calibration. This potential is likely to be particularly great in mid-latitude deserts, where a rich store of fossil leaves is available from rodent middens. Trends in ??D and ??18O of leaf...
Ground temperatures across the old and new roads at mile 130, Richardson highway during 1954-62
H. Jin, M.C. Brewer, R.A. Perkins
Merrill K.S.Merrill K.S., editor(s)
2002, Conference Paper, Cold Regions Engineering Cold Regions Impacts on Transportation and Infrastructure: Proceedings of the Eleventh International Conference
Year-round studies of the geothermal impacts of road construction in a "warm" permafrost area were undertaken during 1954-1962 at six road sections across the Richardson and Glenn Highways, in the vicinity of Glennallen, Alaska. As a result, significant information was obtained regarding the temperatures, and changes in temperatures, in the...
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...
Comparison of desert tortoise (Gopherus agassizii) populations in an unused and off-road vehicle area in the Mojave Desert
R. Bruce Bury, R.A. Luckenbach
2002, Chelonian Conservation and Biology (2) 457-463
No abstract available....
Bedform movement recorded by sequential single-beam surveys in tidal rivers
R.L. Dinehart
2002, Journal of Hydrology (258) 25-39
A portable system for bedform-mapping was evaluated in the delta of the lower Sacramento and San Joaquin Rivers, California, from 1998 to 2000. Bedform profiles were surveyed with a two-person crew using an array of four single-beam transducers on boats about 6 m in length. Methods for processing the bedform...
In Search of Easy-to-Use Methods for Calibrating ADCP's for Velocity and Discharge Measurements
K. Oberg
Wahl T.L.Pugh C.A.Oberg K.A.Vermeyen T.B.Wahl T.L.Pugh C.A.Oberg K.A.Vermeyen T.B., editor(s)
2002, Conference Paper, Hydraulic Measurements and Experimental Methods
A cost-effective procedure for calibrating acoustic Doppler current profilers (ADCP) in the field was presented. The advantages and disadvantages of various methods which are used for calibrating ADCP were discussed. The proposed method requires the use of differential global positioning system (DGPS) with sub-meter accuracy and standard software for collecting...
Effects of habitat fragmentation on passerine birds breeding in Intermountain shrubsteppe
S.T. Knick, J.T. Rotenberry
2002, Conference Paper, Studies in Avian Biology
Habitat fragmentation and loss strongly influence the distribution and abundance of passerine birds breeding in Intermountain shrubsteppe. Wildfires, human activities, and change in vegetation communities often are synergistic in these systems and can result in radical conversion from shrubland to grasslands dominated by exotic annuals at large temporal and spatial...
Assessing mine drainage pH from the color and spectral reflectance of chemical precipitates
D.J. Williams, J.M. Bigham, C.A. Cravotta III, S.J. Traina, J.E. Anderson, J.G. Lyon
2002, Applied Geochemistry (17) 1273-1286
The pH of mine impacted waters was estimated from the spectral reflectance of resident sediments composed mostly of chemical precipitates. Mine drainage sediments were collected from sites in the Anthracite Region of eastern Pennsylvania, representing acid to near neutral pH. Sediments occurring in acidic waters contained primarily schwertmannite and goethite...
The dynamics of subtidal poleward flows over a narrow continental shelf, Palos Verdes, CA
M.A. Noble, H. F. Ryan, P.L. Wiberg
2002, Continental Shelf Research (22) 923-944
The Palos Verdes peninsula is a short, very narrow (< 3 km) shelf in southern California that is bracketed by two large embayments. In May 1992, arrays of up to 4 moorings and 2 benthic tripods were deployed in a yearlong study of the circulation processes over this shelf and...
Nestling sex ratios in the southwestern willow flycatcher
Eben H. Paxton, Mark K. Sogge, Tracy McCarthey, Paul Keim
2002, Condor (104) 877-881
Using molecular-genetic techniques, we determined the gender of 202 Southwestern Willow Flycatcher (Empidonax traillii extimus) nestlings from 95 nests sampled over a five-year period. Overall nestling sex ratio did not vary significantly from 50:50 among years, by clutch order, or by mating strategy (monogamous vs. polygamous pairings). However, we did...
Traceable Radiometry Underpinning Terrestrial- and Helio- Studies (TRUTHS)
N. Fox, J. Aiken, J.J. Barnett, X. Briottet, R. Carvell, C. Frohlich, S.B. Groom, O. Hagolle, J.D. Haigh, H. H. Kieffer, J. Lean, D.B. Pollock, T. Quinn, M.C.W. Sandford, M. Schaepman, K.P. Shine, W.K. Schmutz, P.M. Teillet, K. J. Thome, M.M. Verstraete, E. Zalewski
Fujisada H.Lurie J.B.Aten M.L.Weber K., editor(s)
2002, Conference Paper, Proceedings of SPIE - The International Society for Optical Engineering
The Traceable Radiometry Underpinning Terrestrial- and Helio- Studies (TRUTHS) mission offers a novel approach to the provision of key scientific data with unprecedented radiometric accuracy for Earth Observation (EO) and solar studies, which will also establish well-calibrated reference targets/standards to support other EO missions. This paper will present the TRUTHS...
Annual emissions of mercury to the atmosphere from natural sources in Nevada and California
M.F. Coolbaugh, M.S. Gustin, J. J. Rytuba
2002, Environmental Geology (42) 338-349
The impact of natural source emissions on atmospheric mercury concentrations and the biogeochemical cycle of mercury is not known. To begin to assess this impact, mercury emissions to the atmosphere were scaled up for three areas naturally enriched in mercury: the Steamboat Springs geothermal area, Nevada, the New Idria mercury...
The evolving benthic community
Janet K. Thompson
2002, Report, Science and strategies for restoration
No abstract available....
Structure and physical characteristics of pumice from the climactic eruption of Mount Mazama (Crater Lake), Oregon
C. Klug, K. Cashman, Charles R. Bacon
2002, Bulletin of Volcanology (64) 486-501
The vesicularity, permeability, and structure of pumice clasts provide insight into conditions of vesiculation and fragmentation during Plinian fall and pyroclastic flow-producing phases of the ~7,700 cal. year B.P. climactic eruption of Mount Mazama (Crater Lake), Oregon. We show that bulk properties (vesicularity and permeability) can be correlated with internal textures...
Visitor reponse to demonstration fees at National Wildlife Refuges
J. G. Taylor, J.J. Vaske, L.B. Shelby, M.P. Donnelly, Cassandra M. Browne
2002, Wildlife Society Bulletin (30) 1238-1244
In response to a request from the United States Fish and Wildlife Service, we examined the likelihood of visitors changing their plans for future visits to National Wildlife Refuges (NWR) because of changes in entrance or use fees. We obtained data for this study from 3,173 respondents from 14 NWRs...
Tulare Basin Waterfowl and Central Valley Duck Hunters
Joseph P. Fleskes
2002, California Waterfowl 12-13
No abstract available at this time...
Alien plants and fire in desert tortoise (Gopherus agassizii) habitat of the Mojave and Colorado Deserts
M.L. Brooks, T. C. Esque
2002, Chelonian Conservation and Biology (4) 330-340
