Host-parasite relationships and geographic distribution of Salmincola corpulentus (Copepoda: Lernaeopodidae) on bloater (Coregonus hoyi) stocks in Lake Huron
Charles A. Bowen, Ralph M. Stedman
1990, Canadian Journal of Zoology (68) 1988-1994
Examination of the branchial cavities of 8347 adult bloaters (Coregonus hoyi) collected from seven locations in Lake Huron for parasitic copepods yielded only the lernaeopodid Salmincola corpulentus; its distribution was limited to bloaters collected in the southern two-thirds of the lake. The infections were highest off Au Sable Point and on...
Improved method for sectioning pectoral spines of catfish for age determination
Marc A. Blouin, Glenda R. Hall
1990, Journal of Freshwater Ecology (5) 489-490
A modified low-speed saw provided fast and precise sectioning of catfish pectoral spines for use in aging studies. In one hour, 10–15 spines can be sectioned, the sections mounted, and the annuli counted. Two methods commonly used to section ictalurid pectoral spines are (1) acid decalcification, followed by the...
Near-fault measurement of postseismic slip associated with the 1989 Loma Prieta, California, earthquake
M. J. Rymer
1990, Geophysical Research Letters (17) 1789-1792
Five small-aperture (0.5 to 7.7 m) quadrilaterals were installed across the San Andreas fault and newly formed extensional cracks shortly after the October 17, 1989 Loma Prieta M7.1 earthquake. Two quadrilaterals were installed across the San Andreas fault near the southeast and northwest ends of the 1989...
The Ebro margin study, northwestern Mediterranean Sea - an introduction
A. Maldonado, Nelson C. Hans
1990, Marine Geology (95) 157-163
The Ebro continental margin from the coast to the deep sea off northeastern Spain was selected for a multidisciplinary project because of the abundant Ebro River sediment supply, Pliocene and Quaternary progradation, and margin development in a restricted basin where a...
Computational open-channel hydraulics for movable-bed problems
Chintu Lai
Chang Howard H.Hill Joseph C., editor(s)
1990, Conference Paper, Hydraulic Engineering - Proceedings of the 1990 National Conference
As a major branch of computational hydraulics, notable advances have been made in numerical modeling of unsteady open-channel flow since the beginning of the computer age. According to the broader definition and scope of 'computational hydraulics,' the basic concepts and technology of modeling unsteady open-channel flow have been systematically studied...
Ground-water control of evaporite deposition
W.W. Wood, W. E. Sanford
1990, Economic Geology (85) 1226-1235
Topographically closed basins may be hydrologically open as a result of seepage losses to underlying or surrounding ground-water systems. In such cases, these losses can have a substantial control over the suite and the thicknesses of evaporite minerals formed in the basin. The ratio of ground-water outflow to inflow (flux...
Decline of wildcelery buds in the lower Detroit River, 1950-85
Donald W. Schloesser, Bruce A. Manny
1990, Journal of Wildlife Management (54) 72-76
American wildcelery buds (Vallisneria americana), an abundant food eaten by diving ducks (Aythini) during migrations, decreased in the lower Detroit River of the Great Lakes from 1950 to 1985. Bud densities decreased at 2 (-14 and -18 buds/mA?) of 5 locations and were similar at 3 (-2, +2, and +3...
Benthic invertebrate bioassays with toxic sediment and pore water
John P. Giesy, Cornell J. Rosiu, Robert L. Graney, Mary G. Henry
1990, Environmental Toxicology and Chemistry (9) 233-248
The relative sensitivities of bioassays to determine the toxicity of sediments were investigated and three methods of making the sample dilutions required to generate dose-response relationships were compared. The assays studied were: (a) Microtox®, a 15-min assay ofPhotobacterium phosphoreum bioluminescence inhibition by pore water; (b) 48-h Daphnia magnalethality test in pore water;...
Toxicokinetics of PAHs in Hexagenia
Guy R. Stehly, Peter F. Landrum, Mary G. Henry, C. Klemm
1990, Environmental Toxicology and Chemistry (9) 167-174
The accumulation kinetics of two waterborne polycyclic aromatic hydrocarbons (PAHs), benzo[a]pyrene (BAP) and phenanthrene (PHE), were studied in the mayfly nymph (Hexagenia limbata). The uptake clearance decreased while the bioconcentration of BAP increased with an increase in weight of the H. limbata nymph. The relationship between uptake clearance and bioconcentration for PHE was...
Anchistropus spp. (Crustacea: Cladocera: Chydoridae): a new distribution record for Lake Erie
Marlene S. Evans, Jarl K. Hiltunen, Donald W. Schloesser
1990, Journal of Great Lakes Research (16) 153-157
This note extends the known Great Lakes distribution of Anchistropus sp. from Lake Michigan, Huron, Superior, and St. Clair to Rondeau Harbor in Lake Erie. Anchistropus sp. was collected in benthic samples where it occurred as epibionts on hydra. Previous studies, which are briefly reviewed, have noted the parasitic...
Trace elements in Corbicula fluminea from the San Joaquin River, California
H.V. Leland, B. C. Scudder
1990, Conference Paper, Science of the Total Environment
(i) Trace element concentrations in soft tissue of the benthic bivalve, Corbicula fluminea, from the San Joaquin River and its major tributaries were examined during the primary irrigation season in relation to the spatial variation in concentrations of major, minor and trace constituents in riverwater and sediments. (ii) Selenium concentrations...
Thermodynamic properties for bunsenite, NiO, magnetite, Fe3O4, and hematite, Fe2O3, with comments on selected oxygen buffer reactions
B. S. Hemingway
1990, American Mineralogist (75) 781-790
Smoothed values of the heat capacities and derived thermodynamic functions are given for bunsenite, magnetite, and hematite for the temperature interval 298.15 to 1800 K. The Gibbs free energy for the reaction Ni + 0.5O2 = NiO is given by the equation ??rG0T = -238.39 + 0.1146T - 3.72 ??...
Traveltime inversion using transmitted waves of offset VSP data
Myung W. Lee
1990, Geophysics (55) 1089-1097
Estimation of layer parameters such as interval velocity, reflector depth, and dip can be formulated as a generalized linear inverse problem using observed arrival times. Based on a 2-D earth model, a computationally efficient and accurate formula is derived for traveltime inversion. This inversion method is applied to offset vertical...
On graphically representing the confidence region for an unknown rotation in three dimensions
M.S. Hanna, T. Chang
1990, Computers & Geosciences (16) 163-194
In assessing the errors involved in reconstructing tectonic plate rotations, it is desirable to have confidence regions for the unknown rotation. This paper presents a method for graphing such confidence regions, which exhibits the dependence of the range of possible angles of rotation on the axis considered. Namely, the minimum...
National contaminant biomonitoring program: Residues of organochlorine chemicals in U.S. Freshwater Fish, 1976–1984
Christopher J. Schmitt, Jim L. Zajicek, Paul H. Peterman
1990, Archives of Environmental Contamination and Toxicology (19) 748-781
The U.S. Fish and Wildlife Service periodically determines concentrations of organochlorine chemicals in freshwater fish collected from a nationwide network of stations as part of the National Contaminant Biomonitoring Program (NCBP, formerly a part of the National Pesticide Monitoring Program). From late 1984 to...
Information on stress conditions in the oceanic crust from oval fractures in a deep borehole
R. H. Morin
1990, Geophysical Research Letters (17) 1311-1314
Oval images etched into the vail of a deep borehole were detected in DSDP (Deep Sea Drilling Project) Hole 504B, eastern equatorial Pacific Ocean, from analysis of an acoustic televiever log. Initial speculation as to the origin of these remarkable features considered the intersection of pillow...
Multielement extraction system for determining 19 trace elements in gold exploration samples
J. Robert Clark, John G. Viets
Hausen Donald M.Halbe Douglas N.Petersen Erich U.Tafuri William J., editor(s)
1990, Conference Paper
A multielement extraction system is being used successfully to provide essentially interference-free geochemical analyses to aid in gold exploration. The Methyl isobutyl ketone-Amine synerGistic Iodide Complex (MAGIC) extraction system separates Ag, As, Au, Bi, Cd, Cu, Ga, Hg, In, Mo, Pb, Pd, Pt, Sb, Se, Sn, Te, Tl, and Zn...
Geology of Medicine Lake Volcano, Northern California Cascade Range
Julie Donnelly-Nolan
1990, Conference Paper, Transactions - Geothermal Resources Council
Medicine Lake volcano (MLV) is located in an E-W extensional environment on the Modoc Plateau just east of the main arc of the Cascades. It consists mainly of mafic lavas, although drillhole data indicate that a larger volume of rhyolite is present than is indicated by surface mapping. The most...
The extraordinary radar echoes from Europa, Ganymede, and Callisto: A geological perspective
S.J. Ostro, E.M. Shoemaker
1990, Icarus (85) 335-345
This outline of plausible geologic explanations for the icy Galilean satellites' radar properties takes into consideration electromagnetic scattering models for the echoes, available empirical and theoretical information about regolith formation, and ice physics. The...
Trace-metal concentrations, waters from selected sky lakes, streams and springs, northern Shawangunk Mountains, New York: geologic and ecologic implications
J. D. Friedman, P.C. Huth, D. Smiley
1990, Northeastern Geology (12) 114-131
Reconnaissance sampling and chemical analysis of water from selected lakes, streams and springs of the northern Shawangunk Mountains in 1987 to 1988 to determine the influence of lithology on trace-metal concentrations in surface water, and to establish a base level of concentration of 27 selected metals by ICP-AES and Hg...
New geologic map of the Island of Hawaii
Edward Wolfe, Jean Morris
1990, Conference Paper, Transactions - Geothermal Resources Council
Recent geologic mapping on the Island of Hawaii is compiled in a detailed new 1:100,000-scale geologic map. The lava flows and pyroclastic deposits of each volcano are assigned to major lithostratigraphic units based on lithology and stratigraphic relations. However, the emphasis of the map is strongly chronostratigraphic. Lavas of latest...
Volcanic hazards in the Pacific Northwest
C.D. Miller
1990, Geoscience Canada (17) 183-187
The Cascade Range stretches from southwestern British Columbia to northern California; the Range consists of major composite volcanic centres, most of which have been active during late Pleistocene and Holocene time. In addition, thousands of smaller basaltic or basaltic-andesite volcanoes have been active during the past few million years. Flowage...
D/H on Mars: Effects of floods, volcanism, impacts, and polar processes
M. H. Carr
1990, Icarus (87) 210-227
Water in the Martian atmosphere is 5.1 times more enriched in deuterium than terrestial water. The enrichment has been previously attributed to either a massive loss of water early in the planet's history or the presence of only a very small...
Analysis of eight argonne premium coal samples by X-ray fluorescence spectrometry
J.R. Evans, G.A. Sellers, R. G. Johnson, D.V. Vivit, J. Kent
1990, Energy & Fuels (4) 440-442
X-ray fluorescence spectrometric methods were used in the analysis of eight Argonne Premium Coal Samples. Trace elements (Cr, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, La, and Ce) in coal ash were determined by energy-dispersive X-ray fluorescence spectrometry; major elements (Na, Mg, Al, Si, P, S, K, Ca,...
Operation of U.S. Geological Survey unmanned digital magnetic observatories
L.R. Wilson
1990, Physics of the Earth and Planetary Interiors (59) 45-54
The precision and continuity of data recorded by unmanned digital magnetic observatories depend on the type of data acquisition equipment used and operating procedures employed. Three generations of observatory systems used by the U.S. Geological Survey are described. A table listing the frequency of component failures in the current observatory...
