The effect of S-wave arrival times on the accuracy of hypocenter estimation
J.S. Gomberg, K. M. Shedlock, S.W. Roecker
1990, Bulletin of the Seismological Society of America (80) 1605-1628
Well-constrained hypocenters (latitude, longitude, depth, and origin time) are required for nearly all studies that use earthquake data. We have examined the theoretical basis behind some of the widely accepted “rules of thumb” for obtaining accurate hypocenter estimates that pertain to the use of S phases and illustrate, in a...
Crustal structure of the northwestern Basin and Range Province from the 1986 Program for Array Seismic Studies of the Continental Lithosphere Seismic Experiment
Harley M. Benz, R. B. Smith, Walter D. Mooney
1990, Journal of Geophysical Research (95) 21823-21842
A portion of northwestern Nevada was imaged to determine the crustal structure and to assess reported differences between refraction versus reflection determinations of Moho depth and how the crustal composition and structure has been influenced by volcanic and extension mechanisms. Interpretation of the refraction/wide-angle reflection data suggests that the crust...
A multilayered sharp interface model of coupled freshwater and saltwater flow in coastal systems: Model development and application
Hedeff I. Essaid
1990, Water Resources Research (26) 1431-1454
A quasi three-dimensional, finite difference model, that simulates freshwater and saltwater flow separated by a sharp interface, has been developed to study layered coastal aquifer systems. The model allows for regional simulation of coastal groundwater conditions, including the effects of saltwater dynamics on the freshwater system. Vertically integrated freshwater and...
Loss of coastal wetlands in Louisiana: Cooperative research to assess the critical processes
S.J. Williams, A. H. Sallenger Jr.
1990, Biological Report - US Fish & Wildlife Service (90) 139-144
Erosion of the nation's shoreline and loss and deterioration of our coastal wetlands are widespread and serious problems that affect all regions of the US. As a result of natural and human-induced factors, the coastal plain of Louisiana, which contains 40% of the tidal wetlands in the conterminous 48 States,...
Organic matter and thermochemical sulfate reduction in the Viburnum Trend, southeast Missouri
J.S. Leventhal
1990, Economic Geology (85) 622-632
The role of organic matter in Mississippi Valley-type Pb-Zn deposits has been studied by systematically sampling and characterizing various types of organic matter in the Upper Cambrian Bonneterre formation in lead-zinc mines from the Viburnum Trend and from rocks as far as 20 km away from the Trend. Organic matter...
Cold-front driven storm erosion and overwash in the central part of the Isles Dernieres, a Louisiana barrier-island arc
J.R. Dingler, T. E. Reiss
1990, Marine Geology (91) 195-206
Tropical and extratropical storms produce significant erosion on the barrier islands of Louisiana. Over the past 100 years, such storms have produced at least 2 km of northward beach-face retreat and the loss of 63% of the surface area of the...
Immunological discrimination of Atlantic striped bass stocks
W. B. Schill, R.M. Dorazio
1990, Transactions of the American Fisheries Society (119) 77-85
Stocks of Atlantic striped bass Morone saxatilis that were assumed to be geographically isolated during spawning showed strong antigenic differences in blood serum albumin. A discriminant function was estimated from the immunologic responses of northern (Canadian and Hudson River) and southern (Chesapeake Bay and Roanoke River) stocks to two reference antisera. The...
Adverse effects of heated Bouin's solution on fish preservation
R. L. Herman, W. F. Krise
1990, Journal of Aquatic Animal Health (1) 307-309
Rainbow trout Oncorhynchus mykiss (formerly Salmo gairdneri) and lake trout Salvelinus namaycush preserved by immersion in Bouin's solution at 48°C became severely deformed due to muscle contraction. This was reflected in tissue changes, indicating that this technique induces undesirable artifacts that are likely...
Geochemical evidence for Se mobilization by the weathering of pyritic shale, San Joaquin Valley, California, U.S.A.
T. S. Presser, W. C. Swain
1990, Applied Geochemistry (5) 703-717
Acidic (pH 4) seeps issue from the weathered Upper Cretaceous-Paleocene marine sedimentary shales of the Moreno Formation in the semi-arid Coast Ranges of California. The chemistry of the acidic solutions is believed to be evidence of current reactions ultimately yielding hydrous...
Patrick Draw field, Wyoming - 1 seismic expression of subtle strat trap in Upper Cretaceous Almond
Robert T. Ryder, Myung W. Lee, Warren F. Agena, Robert C. Anderson
1990, Oil & Gas Journal (88) 54-57
The east flank of the Rock Springs uplift and the adjacent Wamsutter arch contain several large hydrocarbon accumulations. Among these accumulations are Patrick Draw field, which produces oil and gas from a stratigraphic trap in the Upper Cretaceous Almond formation, and Table Rock field, a faulted anticlinal trap that produces...
Discharge rates of fluid and heat by thermal springs of the Cascade Range, Washington, Oregon, and northern California
Robert H. Mariner, T. S. Presser, William C. Evans, M.K.W. Pringle
1990, Journal of Geophysical Research (95) 19517-19531
Fluid and heat discharge rates of thermal springs of the Cascade Range have been determined using the chloride inventory method. Discharge rates of thermal spring groups range from 1 to 120 L s−1. Most of the fluid (50%) and heat (61%) are discharged from two hot spring groups in northern...
Crustal strain near the Big Bend of the San Andreas Fault: Analysis of the Los Padres-Tehachapi Trilateration Networks, California
D. Eberhart-Phillips, M. Lisowski, Mark D. Zoback
1990, Journal of Geophysical Research Solid Earth (95) 1139-1153
In the region of the Los Padres-Tehachapi geodetic network, the San Andreas fault (SAF) changes its orientation by over 30° from N40°W, close to that predicted by plate motion for a transform boundary, to N73°W. The strain orientation near the SAF is consistent with right-lateral shear along the fault, with...
Evaluation of line transect sampling based on remotely sensed data from underwater video
R.A. Bergstedt, David R. Anderson
1990, Transactions of the American Fisheries Society (119) 86-91
We used underwater video in conjunction with the line transect method and a Fourier series estimator to make 13 independent estimates of the density of known populations of bricks lying on the bottom in shallows of Lake Huron. The pooled estimate of density (95.5 bricks per hectare) was close to...
Distribution of annual fishes (Pisces-Rivulidae) in the Rio Unare basin, Venezuela
J.E. Thomerson, D.C. Taphorn, L.G. Nico
1990, BioLlania (7) 33-38
Abstract not supplied at this time...
Petrosaurus mearnsi
M.R. Jennings
1990, Book chapter, Catalogue of American Amphibians and Reptiles
No abstract available at this time...
Petrosaurus
M.R. Jennings
1990, Book chapter, Catalogue of American Amphibians and Reptiles
No abstract available at this time...
Florida manatees: distribution, geographically referenced data sets, and ecological and behavioral aspects of habitat use
T. J. O'Shea, H. I. Kochman
1990, Florida Marine Research Publications (49) 1-57
Abstract not supplied at this time...
[Book review] Amphibians and Roads, edited by T.E.S. Langton
C.K. Dodd Jr.
1990, Conservation Biology (4) 210-211
Review of: Amphibians and Roads: Toad Tunnel Conference Proceedings. Langton, T. E. S., editor. 1989. ACO Technologies PLC. 202 p. ISBN: 0951517201....
Distribucion y abundancia del manati, Trichechus manatus, en Venezuela
M. Correa-Viana, T. J. O'Shea, M.E. Ludlow, J.G. Robinson
1990, BioLlania (7) 101-123
Abstract not supplied at this time...
Management implications of a model of predation by a resident fish on juvenile salmonids migrating through a Columbia River reservoir
Raymond C. Beamesderfer, Bruce E. Rieman, Lewis J. Bledsoe, Steven Vigg
1990, North American Journal of Fisheries Management (10) 290-304
We constructed a model ofpredation by northern squawfish Ptychocheilus oregonensis on juvenile salmonids migrating through John Day Reservoir. The model predicts salmonid survival as a function of number and distribution of northern squawfish, number and timing of juvenile salmonids entering the reservoir, salmonid residence time, water temperature, and flow. The...
Status and habitat requirements of white sturgeon populations in the Columbia River downstream from McNary Dam
S.D. Duke, T.J. Underwood, G.M. Asbridge, R.G. Griswold, M.J. Parsley, L.G. Beckman
1990, Report, Status and habitat requirements of white sturgeon populations in the Columbia River downstream from McNary Dam
No abstract available...
Density-dependence at sea for coho salmon (Oncorhynchus kisutch)
J.M. Emlen, R.R. Reisenbichler, A.M. McGie, T.E. Nickelson
1990, Canadian Journal of Fisheries and Aquatic Sciences (47) 1765-1772
The success of expanded salmon hatchery programs will depend strongly on the degree of density-induced diminishing returns per smolt released. Several authors have addressed the question of density-dependent mortality at sea in coho salmon (Oncorhynchus kisutch), but have come to conflicting conclusions. We believe there are compelling reasons to reinvestigate...
Use of an artificial substrate to collect white sturgeon eggs
G.T. McCabe, L.G. Beckman
1990, California Fish and Game (76) 248-250
No abstract available ...
Changes in numbers of leukocytes in immune organs of juvenile coho salmon after acute stress or cortisol treatment
Alec G. Maule, Carl B. Schreck
1990, Journal of Aquatic Animal Health (2) 298-304
We examined the effects of acute stress and cortisol treatment on the number of leukocytes (normalized for fish body weight) in the blood, thymus, spleen, and anterior kidney of juvenile coho salmon Oncorhynchus kisutch. In acutely stressed or cortisol-fed fish, the numbers of leukocytes increased significantly in the thymus and...
Spatial and temporal variation in proportional stock density and relative weight of smallmouth bass in a reservoir
Matthew G. Mesa, S.D. Duke, David L. Ward
1990, Journal of Freshwater Ecology (5) 323-339
Population data for smallmouth bass Micropterus dolomieui in 20,235 ha John Day Reservoir on the Columbia River were used to (1) determine whether Proportional Stock Density (PSD) and Relative Weight (Wr) varied spatially and temporally in two areas of the reservoir with established smallmouth bass fisheries; (2) explore possible...
