Test of two methods for faulting on finite-difference calculations
D.J. Andrews
1999, Bulletin of the Seismological Society of America (89) 931-937
Tests of two fault boundary conditions show that each converges with second order accuracy as the finite-difference grid is refined. The first method uses split nodes so that there are disjoint grids that interact via surface traction. The 3D version described here is...
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,...
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...
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...
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...
Subsurface gas offshore of northern California and its link to submarine geomorphology
J.W. Yun, D.L. Orange, M.E. Field
1999, Marine Geology (154) 357-368
The northern California continental margin contains evidence of abundant subsurface gas and numerous seafloor features that suggest a causative link between gas expulsion and geomorphology. Analyses of seismic reflection, sidescan sonar, and high-resolution multibeam bathymetric data show that the occurrence of subbottom gas and the migration processes beneath the shelf...
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...
Effects of management practices on grassland birds: Field Sparrow
Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Barry D. Parkin, Betty R. Euliss
1999, Report, Effects of management practices on grassland birds
Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 5,500 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds...
Modeling bird mortality associated with the M/V Citrus oil spill off St. Paul Island, Alaska
Paul L. Flint, Ada C. Fowler, Robert F. Rockwell
1999, Ecological Modelling (117) 261-267
We developed a model to estimate the number of bird carcasses that were likely deposited on the beaches of St. Paul Island, Alaska following the M/V Citrus oil spill in February 1996. Most of the islands beaches were searched on an irregular schedule, resulting in the recovery of 876 King...
Toward the use of remote sensing and other data to delineate functional types in terrestrial and aquatic systems
J. E. Estes, Thomas R. Loveland
A.F. Bouwman, editor(s)
1999, Book chapter, Approaches to scaling of trace gas fluxes in ecosystems
This chapter discusses the role that remotely sensed data play in improving the ability to document the distribution of global land cover types. If the relationships between the cover types and trace gas fluxes can be determined, then the dynamics of these fluxes can be established. The chapter discusses important...
Effects of management practices on grassland birds: Upland Sandpiper
Jill A. Dechant, Meghan F. Dinkins, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Barry D. Parkin, Betty R. Euliss
1999, Report, Effects of management practices on grassland birds
Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 5,500 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds...
Carboniferous and older carbonate rocks: Lithofacies, extent, and reservoir quality: Chapter CC in The oil and gas resource potential of the Arctic National Wildlife Refuge 1002 area, Alaska
Julie A. Dumoulin
1999, Open-File Report 98-34-CC
Carboniferous and older carbonate rocks are potential hydrocarbon reservoir facies for four plays in the 1002 area of the Arctic National Wildlife Refuge. These rocks include several units in the pre-Carboniferous basement and the Carboniferous Lisburne Group. Data from exploratory wells west of the 1002 area, outcrops south of the...
Survival of postfledging mallards in northcentral Minnesota
Ronald E. Kirby, Glen A. Sargeant
1999, Journal of Wildlife Management (63) 403-408
Effective, economical management of waterfowl populations requires an understanding of age-, sex-, and cause-specific forces of mortality. We used radio telemetry to estimate survival rates of immature mallards (Anas platyrhynchos) from fledging to autumn migration in northcentral Minnesota. We monitored 48 females and 42 males during 1972-74 and observed 31...
Seasonal movements, migration, and range sizes of subadult and adult Bamforth Lake California Gulls
B.H. Pugesek, K.L. Diem, C.L. Cordes
1999, Waterbirds (22) 29-36
We investigated seasonal migration patterns of three age classes of California Gulls (Larus californicus). Using band recovery data and reported sightings of patagially marked gulls, we constructed location maps for fledglings, one to two-year-old gulls, and breeding-age adult gulls during five time periods: spring migration, breeding season, early and late...
Effects of management practices on grassland birds: Dickcissel
Jill A. Dechant, Marriah L. Sondreal, Douglas H. Johnson, Lawrence D. Igl, Christopher M. Goldade, Amy L. Zimmerman, Betty R. Euliss
1999, Report, Effects of management practices on grassland birds
Information on the habitat requirements and effects of habitat management on grassland birds were summarized from information in more than 5,500 published and unpublished papers. A range map is provided to indicate the relative densities of the species in North America, based on Breeding Bird Survey (BBS) data. Although birds...
Exploring factors controlling the variability of pesticide concentrations in the Willamette River Basin using tree-based models
S.S. Qian, Chauncey W. Anderson
1999, Environmental Science & Technology (33) 3332-3340
We analyzed available concentration data of five commonly used herbicides and three pesticides collected from small streams in the Willamette River Basin in Oregon to identify factors that affect the variation of their concentrations in the area. The emphasis of this paper is the innovative use of classification and regression...
Phytoremediation of trichloroethene (TCE) using cottonwood trees
S.A. Jones, R. W. Lee, E. L. Kuniansky
Andrea Leeson, Bruce C. Alleman, editor(s)
1999, Conference Paper, Phytoremediation and innovative strategies for specialized remedial applications: Volume 5(6) of <i>Proceedings from the Battelle Memorial Institute international in situ and on-site bioreclamation symposium</i>
Phytoremediation uses the natural ability of plants to degrade contaminants in ground water. A field demonstration designed to remediate aerobic shallow ground water that contains trichloroethene began in April 1996 with the planting of cottonwood trees over an approximately 0.2-hectare area at the Naval Air Station, Fort Worth, Tx. Ground...
Extirpation and recolonization in a metapopulation of an endangered fish, the tidewater goby
K. D. Lafferty, C. C. Swift, R.F. Ambrose
1999, Conservation Biology (13) 1447-1453
The tidewater goby (Eucyclogobius newberryi), an endangered species in the United States, occurs in a series of isolated coastal wetlands in California. Using historical presence-absence data and our own surveys, we estimated annual rates of extirpation and recolonization for several populations of the goby in southern California. As predicted, large...
Use of historical and geospatial data to guide the restoration of a Lake Erie coastal marsh
Kurt P. Kowalski, Douglas A. Wilcox
1999, Wetlands (19) 858-868
Historical and geospatial data were used to identify the relationships between water levels, wetland vegetation, littoral drift of sediments, and the condition of a protective barrier beach at Metzger Marsh, a coastal wetland in western Lake Erie, to enhance and guide a joint federal and state wetland restoration project. Eleven...
Effects of environmental change on plant species density: Comparing predictions with experiments
L. Gough, J.B. Grace
1999, Ecology (80) 882-890
Ideally, general ecological relationships may be used to predict responses of natural communities to environmental change, but few attempts have been made to determine the reliability of predictions based on descriptive data. Using a previously published structural equation model (SEM) of descriptive data from a coastal marsh landscape, we compared...
Refinement, validation, and application of a benthic condition index for northern Gulf of Mexico estuaries
V.D. Engle, J.K. Summers
1999, Estuaries (22) 624-635
By applying discriminant analysis to benthic macroinvertebrate data, we have developed an indicator of benthic condition for northern Gulf of Mexico estuaries. The data used were collected by the United states Environmental Protection Agency’s Environmental Monitoring and Assessment Program (EMAP) in the Louisianian Province from 1991 to 1994. This benthic...
Assessing the effects of fire disturbances on ecosystems: A scientific agenda for research and management
D. L. Schmoldt, David L. Peterson, Robert E. Keane, J. M. Lenihan, D. McKenzie, David R. Weise, D. V. Sandberg
1999, General Technical Report PNW-GTR-455
A team of fire scientists and resource managers convened 17-19 April 1996 in Seattle, Washington, to assess the effects of fire disturbance on ecosystems. Objectives of this workshop were to develop scientific recommendations for future fire research and management activities. These recommendations included a series of numerically ranked scientific and...
Detailed evaluation of gas hydrate reservoir properties using JAPEX/JNOC/GSC Mallik 2L-38 gas hydrate research well downhole well-log displays
T. S. Collett
1999, Bulletin of the Geological Survey of Canada 295-311
The JAPEX/JNOC/GSC Mallik 2L-38 gas hydrate research well project was designed to investigate the occurrence of in situ natural gas hydrate in the Mallik area of the Mackenzie Delta of Canada. Because gas hydrate is unstable at surface pressure and temperature conditions, a major emphasis was placed on the downhole...
Structure and function of fish communities in the southern Lake Michigan basin with emphasis on restoration of native fish communities
Thomas P. Simon, Paul M. Stewart
1999, Natural Areas Journal (19) 142-154
The southern Lake Michigan basin in northwest Indiana possesses a variety of aquatic habitats including riverine, palustrine, and lacustrine systems. The watershed draining this area is a remnant of glacial Lake Chicago and supports fish communities that are typically low in species richness. Composition of the presettlement Lake Michigan fish...
