Mass stranding of wedge-tailed shearwater chicks in Hawaii
Thierry M. Work, Robert Rameyer
1999, Journal of Wildlife Diseases (35) 487-495
Unusual numbers of wedge-tailed shearwater (Puffinus pacificus) chicks stranded on Oahu (Hawaii, USA) in 1994. Compared to healthy wedge-tailed shearwater (WTSW) chicks, stranded chicks were underweight, dehydrated, leukopenic, lymphopenic, eosinopenic, and heterophilic; some birds were toxemic and septic. Stranded chicks also were hypoglycemic and had elevated aspartate amino transferase levels....
Global to local scale simulations of streamflow in the Merced, American, and Carson Rivers, Sierra Nevada, California
M. D. Dettinger, D.R. Cayan, K. Mo, A.E. Jeton
1999, Conference Paper
Atmospheric moisture transport and moisture budgets during winter (December-April) simulated by the National Centers for Environmental Prediction (NCEP) regional spectral model (RSM) are examined and used to simulate streamflow variations in the Sierra Nevada. The RSM was nested in 2"-latitude x 2"-longitude NCEPreanalyzed atmospheric-data fields (as a surrogate for a...
Evaluation of ability of reference toxicity tests to identify stress in laboratory populations of the amphipod Hyalella azteca
E.W. McNulty, F.J. Dwyer, Mark R. Ellersieck, E.I. Greer, C.G. Ingersoll, C.F. Rabeni
1999, Environmental Toxicology and Chemistry (18) 544-548
Standard methods for conducting toxicity tests imply that the condition of test organisms can be established using reference toxicity tests. However, only a limited number of studies have evaluated whether reference toxicity tests can actually be used to determine if organisms are in good condition at the start of a...
Juvenile Marbled Murrelet nurseries and the productivity index
Kathy J. Kuletz, John F. Piatt
1999, The Wilson Bulletin (111) 257-261
Late summer counts of juveniles at sea are used as an index of Marbled Murrelet (Brachyramphus marmoratus) reproductive success, but little is known about juvenile dispersal or habitat use. Further, it is not known whether these counts accurately reflect absolute breeding success. To address these questions we conducted five boat...
Ground-water, large-lake interactions in Saginaw Bay, Lake Huron: A geochemical and isotopic approach
J.J. Kolak, D.T. Long, J.M. Matty, G.J. Larson, D.F. Sibley, T.B. Councell
1999, Geological Society of America Bulletin (111) 177-188
Delineating the nature and extent of ground-water inputs is necessary to understand the hydrochemistry of large lakes. Characterizing the interaction between ground water and large lakes (e.g., the Great Lakes) is facilitated by the use of geochemical and isotopic data. In this study,...
The epipelagic fish community of Beaufort Sea coastal waters, Alaska
L. E. Jarvela, Lyman K. Thorsteinson
1999, Arctic (52) 80-94
A three-year study of epipelagic fishes inhabiting Beaufort Sea coastal waters in Alaska documented spatial and temporal patterns in fish distribution and abundance and examined their relationships to thermohaline features during summer. Significant interannual, seasonal, and geographical differences in surface water temperatures and salinities were observed. In 1990, sea ice...
Magmatic interactions as recorded in plagioclase phenocrysts of Chaos Crags, Lassen Volcanic Center, California
F. J. Tepley III, J.P. Davidson, M.A. Clynne
1999, Journal of Petrology (40) 787-806
The silicic lava domes of Chaos Crags in Lassen Volcanic National Park contain a suite of variably quenched, hybrid basaltic andesite magmatic inclusions. The inclusions represent thorough mixing between rhyodacite and basalt recharge liquids accompanied by some mechanical disaggregation of the inclusions resulting in crystals mixing into the rhyodacite host...
Permian paleoclimate data from fluid inclusions in halite
K.C. Benison, R.H. Goldstein
1999, Chemical Geology (154) 113-132
This study has yielded surface water paleotemperatures from primary fluid inclusions in mid Permian Nippewalla Group halite from western Kansas. A 'cooling nucleation' method is used to generate vapor bubbles in originally all-liquid primary inclusions. Then, surface water paleotemperatures are obtained by measuring temperatures of homogenization to liquid. Homogenization temperatures...
Estimates of bottom roughness length and bottom shear stress in South San Francisco Bay, California
R. T. Cheng, C. #NAME? Ling, J. W. Gartner, P.-F. Wang
1999, Journal of Geophysical Research C: Oceans (104) 7715-7728
A field investigation of the hydrodynamics and the resuspension and transport of particulate matter in a bottom boundary layer was carried out in South San Francisco Bay (South Bay), California, during March-April 1995. Using broadband acoustic Doppler current profilers, detailed measurements of turbulent mean velocity distribution within 1.5 m above...
Estimates of suspended-sediment flux and bedform activity on the inner portion of the Eel continental shelf
D.A. Cacchione, P.L. Wiberg, J. Lynch, J. Irish, P. Traykovski
1999, Marine Geology (154) 83-97
Energetic waves, strong bottom currents, and relatively high rates of sediment discharge from the Eel River combined to produce large amounts of suspended-sediment transport on the inner continental shelf near the Eel River during the winter of 1995-1996. Bottom-boundary-layer (BBL) measurements at a depth of ~50 m using the GEOPROBE...
Estimating Transmissivity from the Water Level Fluctuations of a Sinusoidally Forced Well
E. Mehnert, A.J. Valocchi, M. Heidari, S.G. Kapoor, P. Kumar
1999, Groundwater (37) 855-860
The water levels in wells are known to fluctuate in response to earth tides and changes in atmospheric pressure. These water level fluctuations can be analyzed to estimate transmissivity (T). A new method to estimate transmissivity, which assumes that the atmospheric pressure varies in a...
Stem demography and postfire recruitment of a resprouting serotinous conifer
Jon E. Keeley, Melanie B. Keeley, William J. Bond
1999, Journal of Vegetation Science (10) 69-76
The contribution of resprouts and seedling recruitment to post-fire regeneration of the South African fynbos conifer Widdringtonia nodiflora was compared eight months after wildfires in 1990. Stems on all trees were killed by fire but resprouting success was > 90 % at all but one site. A demographic study of...
Alaska resource data file: Big Delta quadrangle
Cameron Rombach
1999, Open-File Report 99-354
No abstract available....
Digital photogrammetric analysis of the IMP camera images: Mapping the Mars Pathfinder landing site in three dimensions
Randolph L. Kirk, Elpitha Howington-Kraus, Trent M. Hare, E. Dorrer, D. Cook, Kris J. Becker, K. Thompson, B. Redding, J. Blue, D. Galuszka, E.M. Lee, Lisa R. Gaddis, J. R. Johnson, Laurence A. Soderblom, A. W. Ward, P. H. Smith, D.T. Britt
1999, Journal of Geophysical Research E: Planets (104) 8869-8887
This paper describes our photogrammetric analysis of the Imager for Mars Pathfinder data, part of a broader program of mapping the Mars Pathfinder landing site in support of geoscience investigations. This analysis, carried out primarily with a commercial digital photogrammetric system, supported by our in‐house Integrated Software for Imagers and...
Water-use patterns of woody species in pineland and hammock communities of South Florida
Sharon M. Ewe, Leonel S. Sternberg, David E. Busch
1999, Forest Ecology and Management (118) 139-148
Rockland pine forests of south Florida dominated by Pinus elliottii var. densa characteristically have poor soil development in relation to neighboring hardwood hammocks. This has led to the hypothesis that Everglades hammock trees are more reliant on soil moisture derived from local precipitation whereas pineland plants must depend more on...
Exotic plant species invade hot spots of native plant diversity
T.J. Stohlgren, Dan Binkley, G.W. Chong, M. A. Kalkhan, L. D. Schell, K.A. Bull, Yuka Otsuki, G. Newman, Michael A. Bashkin, Y. Son
1999, Ecological Monographs (69) 25-46
Some theories and experimental studies suggest that areas of low plant species richness may be invaded more easily than areas of high plant species richness. We gathered nested-scale vegetation data on plant species richness, foliar cover, and frequency from 200 1-m2 subplots (20 1000-m2 modified-Whittaker plots) in the Colorado Rockies...
Attenuation and source properties at the Coso Geothermal area, California
S. E. Hough, J.M. Lees, F. Monastero
1999, Bulletin of the Seismological Society of America (89) 1606-1619
We use a multiple-empirical Green's function method to determine source properties of small (M −0.4 to 1.3) earthquakes and P- and S-wave attenuation at the Coso Geothermal Field, California. Source properties of a previously identified set of clustered events from the Coso geothermal region are first...
Elastic-wave velocity in marine sediments with gas hydrates: Effective medium modeling
M.B. Helgerud, J. Dvorkin, A. Nur, A. Sakai, T. Collett
1999, Geophysical Research Letters (26) 2021-2024
We offer a first-principle-based effective medium model for elastic-wave velocity in unconsolidated, high porosity, ocean bottom sediments containing gas hydrate. The dry sediment frame elastic constants depend on porosity, elastic moduli of the solid phase, and effective pressure. Elastic moduli of saturated sediment are calculated from...
Assessment of offshore New Jersey sources of Beach replenishment sand by diversified application of geologic and geophysical methods
J.S. Waldner, D. W. Hall, J. Uptegrove, R. E. Sheridan, G.M. Ashley, D. Esker
1999, Marine Georesources and Geotechnology (17) 139-140
Beach replenishment serves the dual purpose of maintaining a source of tourism and recreation while protecting life and property. For New Jersey, sources for beach sand supply are increasingly found offshore. To meet present and future needs, geologic and geophysical techniques can be used to improve the identification, volume estimation,...
Nonlinear soil response in the vicinity of the Van Normal Complex following the 1994 Northridge, California, earthquake
G. Cultrera, D.M. Boore, W. B. Joyner, C.M. Dietel
1999, Bulletin of the Seismological Society of America (89) 1214-1231
Ground-motion recording obtaineds at the Van Norman Complex from the 1994 Northridge, California, mainshock and its aftershocks constitute an excellent data set for the analysis of soil response as a function of ground-motion amplitude. We searched for nonlinear response by comparing the Fourier...
Characterizing a sewage plume using the 3H-3He dating technique
Stephanie Dunkle Shapiro, Denis LeBlanc, Peter Schlosser, Andrea Ludin
1999, Ground Water (37) 861-878
An extensive 3H-3He study was performed to determine detailed characteristics of a regional flow system and a sewage plume over a distance of 4 km in a sand and gravel aquifer at Otis Air Base in Falmouth, Massachusetts. 3H-3He ages increase with depth in individual piezometer clusters and with distance...
Management of groundwater supply and water quality in the Los Angeles Basin, California
E.G. Reichard, S.M. Crawford, M.T. Land, K.S. Paybins
1999, Conference Paper, IAHS-AISH Publication
Water use and water needs in the coastal Los Angeles Basin in California have been very closely tied to the development of the region during the last 150 years. The first water wells were drilled in the mid-1800s. Currently about 40% of the water supply (9.4 m3 s-1) in the...
Applied historical ecology: Using the past to manage for the future
Thomas W. Swetnam, Craig D. Allen, Julio L. Betancourt
1999, Ecological Applications (9) 1189-1206
Applied historical ecology is the use of historical knowledge in the management of ecosystems. Historical perspectives increase our understanding of the dynamic nature of landscapes and provide a frame of reference for assessing modern patterns and processes. Historical records, however, are often too brief or fragmentary to be useful, or...
Soil water retention and maximum capillary drive from saturation to oven dryness
Hubert J. Morel-Seytoux, John R. Nimmo
1999, Water Resources Research (35) 2031-2041
This paper provides an alternative method to describe the water retention curve over a range of water contents from saturation to oven dryness. It makes two modifications to the standard Brooks and Corey [1964] (B-C) description, one at each end of the suction range. One expression proposed by Rossi and Nimmo [1994] is used...
Nitrate in groundwater of the midwestern United States: A regional investigation on relations to land use and soil properties
D. Kolpin, M. Burkart, D. Goolsby
1999, IAHS-AISH Publication 111-116
The intense application of nitrogen-fertilizer to cropland in the midwestern United States has created concern about nitrate contamination of the region's aquifers. Since 1991, the US Geological Survey has used a network of 303 wells to investigate the regional distribution of nitrate in near-surface aquifers of the midwestern United States....
