H4IIE rat hepatoma cell bioassay-derived 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents in colonial fish-eating waterbird eggs from the Great Lakes
Donald E. Tillitt, Gerald T. Ankley, David A. Verbrugge, John P. Giesy, James P. Ludwig, Timothy J. Kubiak
1991, Archives of Environmental Contamination and Toxicology (21) 91-101
Fish-eating waterbirds from the Great Lakes of North America have shown symptoms of poisoning similar to those observed in laboratory exposures of various avian species to planar halogenated hydrocarbons (PHHs). PHHs, include among others, polychlorinated biphenyls (PCBs), polychlorinated dibenzo-p-dioxins (PCDDs), and polychlorinated dibenzofurans (PCDFs) and have...
Instream flow needs below peaking hydroelectric projects
Robert T. Milhous
1991, Book, Waterpower 91: Proceedings of the International Conference on Hydropower
No abstract available....
A water budget approach to instream flow maintenance
T.J. Waddle
1991, Book, Waterpower 91: Proceedings of the international conference on hydropower
No abstract available....
Steady-state simulation of ground-water flow conditions in the Kingshill aquifer, St. Croix, U.S. Virgin Islands
Sigfredo Torres-Gonzalez
Fernando Gomez-Gomez, Vicente Quinones-Aponte, A.I. Johnson, editor(s)
1991, Conference Paper, AWRA Monograph Series no. 15
Water-resources development and its influence on the water budget for the aquifer system in the Salinas to Patillas area
Vicente Quinones-Aponte
Fernando Gomez-Gomez, A.I. Johnson, editor(s)
1991, Conference Paper, Regional aquifer systems of the United States, aquifers of the Caribbean Islands : papers presented at AWRA International Symposium on Tropical Hydrology
Remagnetization and northward translation of Mesozoic red chert from Cedros Island and the San Benito Islands, Baja California, Mexico: Reply
Jonathan T. Hagstrum, R.L. Sedlock
1991, Geological Society of America Bulletin (103) 968-969
No abstract available....
Prescribed grazing as a secondary impact in a western riparian floodplain
J.A. Sedgwick, F.L. Knopf
1991, Journal of Range Management (44) 369-373
The effect of late-autumn cattle grazing on plant biomass was examined in a western Great Plains cottonwood riparian zone prone to catastrophic flooding every 5-8 years. Following 1 year of pre-treatment data collection in 1982, five 16-ha pastures were grazed from 1982 to 1984 and compared to 5 control pastures...
A method for the concentration of fine-grained rutile (TiO2) from sediment and sedimentary rocks by chemical leaching
Judith A. Commeau, Page C. Valentine
1991, Economic Geology (86) 878-882
Quaternary marine sediment in the Gulf of Maine basins contains 0.7 to 1.0 wt percent TiO2 (determined by X-ray fluorescence spectrometry). Most of this TiO2 exists in the form of silt-size rutile crystals that are visible by using the petrographic microscope with transmitted light (Valentine and Commeau, 1990). The identification...
Fall and winter distribution of Canada geese in the Mississippi flyway
Michael D. Samuel, Donald H. Rusch, Kenneth F. Abraham, Murray M. Gillespie, J. Paul Prevett, George W. Swenson
1991, Journal of Wildlife Management (55) 449-456
Canada geese (Branta canadensis) from northern Manitoba and northern Ontario were marked with leg bands and neck bands and observed throughout the Mississippi flyway from 1978 to 1989. We used observations of neck-banded geese within each state to determine the relative fall/winter distribution of the Eastern Prairie Population (EPP) and...
Quartz dissolution in organic-rich aqueous systems
Philip C. Bennett
1991, Geochimica et Cosmochimica Acta (55) 1781-1797
Organic electrolytes are a common component of natural waters and are known to be important in many rock-water interactions. The influence of organic electrolytes on silica mobility, quartz solubility, and quartz dissolution kinetics, however, is less well understood. While there is mounting evidence supporting the presence of an aqueous organic-silica...
Variability of an unsaturated sand unit underlying a radioactive- waste trench
Richard W. Healy, Patrick C. Miller
1991, Soil Science Society of America Journal (55) 899-907
Properties of soils vary considerably within any field. This study was conducted to investigate the variability in properties of an unsaturated sand unit that lies at a depth of 13 m below land surface. Four-hundred-forty soil core samples, obtained from a 1.75 by 18-m horizontal plane within a sand unit...
Evaluation of hydraulic conductivities calculated from multi-port permeameter measurements
Steven H. Wolf, Michael A. Celia, Kathryn M. Hess
1991, Groundwater (29) 516-525
A multiport permeameter was developed for use in estimating hydraulic conductivity over intact sections of aquifer core using the core liner as the permeameter body. Six cores obtained from one borehole through the upper 9 m of a stratified glacial-outwash aquifer were used to evaluate the reliability of the permeameter....
Historical changes in laying date, clutch size, and nest success of American black ducks
David G. Krementz, Vernon D. Stotts, Daniel B. Stotts, James E. Hines, Steven L. Funderburk
1991, Journal of Wildlife Management (55) 462-466
The breeding population of American black ducks (Anas rubripes) on Chesapeake Bay has declined over the past 30 years. We tested whether there have been changes in laying date, clutch size, and nest success of breeding black ducks on islands in Chesapeake Bay between the 1950's and 1980's. None of...
Collimated neutron probe for soil water content measurements
J.M. Klenke, Alan L. Flint
1991, Soil Science Society of America Journal (55) 916-923
The use of uncollimated (undirected) neutron moisture meters is common in the biological and geophysical sciences. A collimated neutron probe was designed to enable measurements in specific directions from the access tube. To determine the size and shape of soil volume affecting the neutron counts, experiments were conducted to evaluate:...
Changes in mallard breeding populations in relation to production and harvest rates
Robert E. Reynolds, John R. Sauer
1991, Journal of Wildlife Management (55) 483-487
We used breeding population, band recovery, and hunter harvest data to examine whether rates of productivity and harvest correlated with annual changes in mallard (Anas platyrhynchos) breeding populations. Percent change in the size of the breeding population correlated positively with an index of production rate and negatively with an index...
Mediterranean seabed in digital shaded relief
Robert K. Mark, Richard J. Pike, Giovanni Bortoluzzi, Marco Ligi
1991, Eos Science News (72) 273-274
Relief-shaded images made from a large digital depth model (DDM) provide a fresh view of regional tectonism and submarine geomorphology in the central Mediterranean. The 1-km spatial resolution is better than that afforded by the 5-arc-minute worldwide digital bathymetry (DBDB5). These computer pictures enable information on seafloor morphology to be...
Development of a biotinylated DNA probe for detection of infectious hematopoietic necrosis virus
R.E. Deering, C.K. Arakawa, K.H. Oshima, P.J. O’Hara, M.L. Landolt, J. R. Winton
1991, Diseases of Aquatic Organisms (11) 57-65
A nonrad~oact~ve DNA probe assay was developed to detect and ~dent~fy infect~ous hernatopoiet~c necrosls virus (IHNV) uslng a dot blot format The probe a synthet~c DNA oligonucleot~de labeled enzymatlcally w~th biotln hybnd~zed spec~f~cally w~th nucleocaps~d mRNA extracted from Infected cells early In the vlrus repl~cation cycle A rap~d guan~dln~um th~ocyanate...
Open marsh water management in the mid-Atlantic region: Aerial surveys of waterbird use
R.M. Erwin, D.K. Dawson, Daniel B. Stotts, L.S. McAllister, P.H. Geissler
1991, Wetlands (11) 209-228
Nine marsh sites were selected in Maryland, Delaware, and New Jersey to assess the importance of ponds created by Open Marsh Water Management (OMWM) to migratory birds. At eight of the nine sites, OMWM ponds were paired with areas of similar-sized natural ponds. Eleven aerial surveys were conducted,...
Interactive effects of boron, selenium, and dietary protein on survival, growth and physiology in mallard ducklings
D. J. Hoffman, C. J. Sanderson, L. J. LeCaptain, E. Cromartie, G.W. Pendleton
1991, Archives of Environmental Contamination and Toxicology (20) 288-294
High concentrations of boron (B) and selenium (Se) have been found in aquatic food chains associated with irrigation drainwater. Total biomass of invertebrates, a major source of protein for wild ducklings, is sometimes diminished in agricultural drainwater ponds contaminated with Se and B. Day-old mallard (Anas platyrhynchos) ducklings received an...
Developmental toxicity of diphenyl ether herbicides in nestling American kestrels
D. J. Hoffman, J. W. Spann, L. J. LeCaptain, C.M. Bunck, Barnett A. Rattner
1991, Journal of Toxicology and Environmental Health (34) 323-336
Beginning the day after hatching, American kestrel (Falco sparverius) nestlings were orally dosed for 10 consecutive days with 5 microliters/g of corn oil (controls) or one of the diphenyl ether herbicides (nitrofen, bifenox, or oxyfluorfen) at concentrations of 10, 50, 250, or 500 mg/kg in corn oil. At 500 mg/kg,...
40Ar/39Ar age of Cretaceous-Tertiary boundary tektites from Haiti
G. A. Izett, G. B. Dalrymple, L.W. Snee
1991, Science (252) 1539-1542
40Ar/39Ar dating of tektites discovered recently in Cretaceous-Tertiary (K-T) boundary marine sedimentary rocks on Haiti indicates that the K-T boundary and impact event are coeval at 64.5 ± 0.1 million years ago. Sanidine from a bentonite that lies directly above the K-T boundary in continental, coal-bearing, sedimentary rocks of Montana...
Proceedings of the Second National U.S. Fish and Wildlife Service Geographic Information Systems Workshop, June 10-13, 1991
F. D’Erchia
1991, Book
No abstract available....
Application of GIS to evaluate Sandhill Crane nest site characteristics
B.W. Baker, W.L. Mangus
1991, Book, National U.S. Fish and Wildlife Service Geographic Information Systems workshop
No abstract available....
Resource constraints in petroleum production potential
C.D. Masters, D. H. Root, E. D. Attanasi
1991, Science (253) 146-152
Geologic reasons indicate that the dominant position of the Middle East as a source of conventional petroleum will not be changed by new discoveries elsewhere. The share of world crude oil production coming from the Middle East could increase, within 10 to 20 years, to exceed 50 percent, under even...
Gages for measuring fluvial-sediment concentration
J. V. Skinner, J.J. Szalona
1991, Conference Paper
No abstract available....
