Lower Turonian (Upper Cretaceous) Watinoceras devonense Zone ammonite fauna in Colorado, USA
W. J. Kennedy, W. A. Cobban, W.P. Elder, J.I. Kirkland
1999, Cretaceous Research (20) 629-639
The basal Turonian Watinoceras devonense Zone fauna from the Bridge Creek Member of the Greenhorn Limestone in southeastern Colorado is described and illustrated, including material from the Rock Canyon area near Pueblo, where the base of bed 86, which corresponds to the first appearance of W. devonense Wright and Kennedy,...
Iron reduction in the sediments of a hydrocarbon-contaminated aquifer
M.E. Tuccillo, I.M. Cozzarelli, J.S. Herman
1999, Applied Geochemistry (14) 655-667
Sediments sampled at a hydrocarbon-contaminated, glacial-outwash, sandy aquifer near Bemidji, Minnesota, were analyzed for sediment-associated Fe with several techniques. Extraction with 0.5 M HCl dissolved poorly crystalline Fe oxides and small amounts of Fe in crystalline Fe oxides, and extracted Fe from phyllosilicates. Use...
Florida Bay: A history of recent ecological changes
J.W. Fourqurean, M. B. Robblee
1999, Estuaries (22) 345-357
Florida Bay is a unique subtropical estuary at the southern tip of the Florida peninsula. Recent ecological changes (seagrass die-off, algal blooms, increased turbidity) to the Florida Bay ecosystem have focused the attention of the public, commercial interests, scientists, and resource managers on the factors influencing the structure and function...
Apparatus investigates geological aspects of gas hydrates
J.S. Booth, W.J. Winters, William P. Dillon
1999, Oil & Gas Journal (97) 63-70
The US Geological Survey (USGS), in response to potential geohazards, energy resource potential, and climate issues associated with marine gas hydrates, has developed a laboratory research system that permits hydrate genesis and dissociation under deep-sea conditions, employing user-selected sediment types and pore fluids.The apparatus, GHASTI (gas hydrate and sediment test...
A possible link between Balkan endemic nephropathy and the leaching of toxic organic compounds from Pliocene lignite by groundwater: Preliminary investigation
W. H. Orem, G. L. Feder, R. B. Finkelman
1999, International Journal of Coal Geology (40) 237-252
Balkan endemic nephropathy (BEN) is a fatal kidney disease that is known to occur only in clusters of villages in alluvial valleys of tributaries of the Danube River in Bulgaria, Romania, Yugoslavia, Bosnia, and Croatia. The confinement of this disease to a specific geographic area has led to speculation that...
Geomicrobiology of subglacial ice above Lake Vostok, Antarctica
J.C. Priscu, E.E. Adams, W.B. Lyons, M.A. Voytek, D.W. Mogk, R.L. Brown, C.P. McKay, C.D. Takacs, K.A. Welch, C.F. Wolf, J. D. Kirshtein, R. Avci
1999, Science (286) 2141-2144
Data from ice 3590 meters below Vostok Station indicate that the ice was accredit from liquid water associated with Lake Vostok. Microbes were observed at concentrations ranging from 2.8 x 103 to 3.6 x 104 cells per milliliter; no biological incorporation of selected organic substrates or bicarbonate was detected. Bacterial...
Variability in bacterial community structure during upwelling in the coastal ocean
L.J. Kerkhof, M.A. Voytek, Robert M. Sherrell, D. Millie, O. Schofield
1999, Hydrobiologia (401) 139-148
Over the last 30 years, investigations at the community level of marine bacteria and phytoplankton populations suggest they are tightly coupled. However, traditional oceanographic approaches cannot assess whether associations between specific bacteria and phytoplankton exist. Recently, molecular based approaches have been implemented to characterize specific members of different marine bacterial...
Effects of a pesticide on tadpole activity and predator avoidance behavior
C.M. Bridges
1999, Journal of Herpetology (33) 303-306
No abstract available....
Double-survey estimates of bald eagle populations in Oregon
R.G. Anthony, Monte G. Garrett, F.B. Isaacs
1999, Journal of Wildlife Management (63) 794-802
The literature on abundance of birds of prey is almost devoid of population estimates with statistical rigor. Therefore, we surveyed bald eagle (Haliaeetus leucocephalus) populations on the Crooked and lower Columbia rivers of Oregon and used the double-survey method to estimate populations and sighting probabilities for different survey methods (aerial,...
Dust devil vortices seen by the Mars Pathfinder camera
S.M. Metzger, J.R. Carr, J. R. Johnson, T. J. Parker, M.T. Lemmon
1999, Geophysical Research Letters (26) 2781-2784
Discovery of dust devil vortices in Mars Pathfinder (MPF) images reveals a dust entrainment mechanism at work on Mars. Scattering of visible light by dust in the Martian atmosphere creates a pronounced haze, preventing conventional image processing from displaying dust plumes. Spectral differencing techniques have enhanced...
Technical note: A device for obtaining time-integrated samples of ruminal fluid
R. N. Corley III, M.R. Murphy, J. Lucena, S.V. Panno
1999, Journal of Animal Science (77) 2540-2544
A device was adapted to allow for time-integrated sampling of fluid from the rumen via a cannula. The sampler consisted of a cup-shaped ceramic filter positioned in the ventral rumen of a cannulated cow and attached to a tube through which fluid entering the filter was removed continuously using a...
Synopsis of strontium isotope variations in groundwater at Aspo, southern Sweden
Z. E. Peterman, B. Wallin
1999, Applied Geochemistry (14) 939-951
Strontium isotope ratios are used to identify end-member ground-water compositions at Aspo in southeastern Sweden where the Hard Rock Laboratory (HRL) has been constructed to evaluate the suitability of crystalline rock for the geologic disposal of nuclear waste. The Hard Rock Laboratory is a decline (tunnel) constructed in 1.8 Ga-old...
Air blasts generated by rockfall impacts: Analysis of the 1996 Happy Isles event in Yosemite National Park
M.M. Morrissey, W. Z. Savage, G. F. Wieczorek
1999, Journal of Geophysical Research B: Solid Earth (104) 23189-23198
The July 10, 1996, Happy Isles rockfall in Yosemite National Park, California, released 23,000 to 38,000 m3 of granite in four separate events. The impacts of the first two events which involved a 550-m free fall, generated seismic waves and atmospheric pressure waves (air blasts). We focus on the dynamic behavior...
Anatomy of the Dead Sea transform: Does it reflect continuous changes in plate motion?
Uri S. ten Brink, M. Rybakov, A. S. Al-Zoubi, M. Hassouneh, U. Frieslander, A.T. Batayneh, V. Goldschmidt, M.N. Daoud, Y. Rotstein, J.K. Hall
1999, Geology (27) 887-890
A new gravity map of the southern half of the Dead Sea transform offers the first regional view of the anatomy of this plate boundary. Interpreted together with auxiliary seismic and well data, the map reveals a string of subsurface basins of widely...
Iapetonudus (N. gen.) and Iapetognathus Landing, unusual Earliest Ordovician multielement conodont taxa and their utility for biostratigraphy
R.S. Nicoll, J.F. Miller, G.S. Nowlan, J.E. Repetski, Raymond L. Ethington
1999, Brigham Young University Geology Studies (44) 27-55
The Early Ordovician (Tremadocian) multielement conodont genus Iapetognathus is one of the oldest denticulate euconodont genera known. The ramiform-ramiform apparatus structure of Iapetognathus is not similar morphologically to other Late Cambrian to Earliest Ordovician denticulate multielement taxa, such as Eodentatus or Cordyloduts, because the major denticulate process has a lateral...
Status of lake trout rehabilitation in the Northern Refuge of Lake Michigan
Charles P. Madenjian, Timothy J. Desorcie
1999, North American Journal of Fisheries Management (19) 658-669
The Northern Refuge in Lake Michigan was established in 1985 as part of a rehabilitation program to stock yearling lake trout Salvelinus namaycush in areas with the best potential for success. Stocking of hatchery-reared lake trout within the refuge began in 1986 at three reefs: Boulder Reef, Gull Island Reef,...
Evaluating sediment chemistry and toxicity data using logistic regression modeling
L.J. Field, D.D. MacDonald, S.B. Norton, C.G. Severn, C.G. Ingersoll
1999, Environmental Toxicology and Chemistry (18) 1311-1322
This paper describes the use of logistic-regression modeling for evaluating matching sediment chemistry and toxicity data. Contaminant- specific logistic models were used to estimate the percentage of samples expected to be toxic at a given concentration. These models enable users to select the probability of effects of concern corresponding to...
Cu(II) binding by a pH-fractionated fulvic acid
G.K. Brown, S.E. Cabaniss, P. MacCarthy, J.A. Leenheer
1999, Analytica Chimica Acta (402) 183-193
The relationship between acidity, Cu(II) binding and sorption to XAD resin was examined using Suwannee River fulvic acid (SRFA). The work was based on the hypothesis that fractions of SRFA eluted from an XAD column at various pH's from 1.0 to 12.0 would show systematic variations in acidity and possibly...
Linking the10Be continental record of Lake Baikal to marine and ice archives of the last 50 ka: Implication for the global dust-aerosol input
A. Aldahan, G. Possnert, J. Peck, J. King, S. Colman
1999, Geophysical Research Letters (26) 2885-2888
We present here a 10Be profile from the continental sediments of Lake Baikal (the world's largest fresh water lake), which, for the first time, shows the ≈ 40 ka 10Be enhancement and a pattern that strongly matches those from the marine and ice records for the last 50...
Quaternary glacial and deglacial Ostracoda in the thermocline of the Little Bahama Bank (NW Atlantic): Palaeoceanographic implications
J. Rodriguez-Lazaro, T. M. Cronin
1999, Palaeogeography, Palaeoclimatology, Palaeoecology (152) 339-364
We determined faunal and oceanographic changes during the last glacial and deglacial in the Providence Channel, Little Bahama Bank (LBB), using modern ocean (from LBB, Florida-Hatteras Slope and Blake Plateau, western North Atlantic) and late Quaternary (LBB) distributions of the benthic ostracode genus Krithe from the mid-depth (300-1600 m) subtropical...
Composition and origin of Early Cambrian Tiantaishan phosphorite-Mn carbonate ores, Shaanxi Province, China
J.R. Hein, D. Fan, J. Ye, T. Liu, H.-W. Yeh
1999, Ore Geology Reviews (15) 95-134
The Tiantaishan phosphorite-Mn carbonate ores occur in the Early Cambrian Tananpo Formation in complexly folded and faulted rocks located in southern Shaanxi Province. About 65 x 106 tonnes of 17% P2O5 ore reserves exist and Mn-ore reserves are about 8.3 x 106 tonnes of +18% Mn. The stratigraphic sequence in...
Application of flowmeter and depth-dependent water quality data for improved production well construction
M.A. Gossell, Tracy Nishikawa, Randall T. Hanson, John A. Izbicki, M.A. Tabidian, K. Bertine
1999, Ground Water (37) 729-735
Ground water production wells commonly are designed to maximize well yield and, therefore, may be screened over several water-bearing zones. These water-bearing zones usually are identified, and their hydrogeologic characteristics and water quality are inferred, on the basis of indirect data such as geologic and geophysical logs. Production well designs...
Tannins as nutritional constraints for elk and deer of the coastal Pacific Northwest.
Edward E. Starkey, Patricia J. Happe, M. P. Gonzalez-Hernandez, K. M. Lange, J. J. Karchesy
1999, Book chapter, Plant polyphenols 2: Chemistry, biology, pharmacology, ecology
In the coastal Pacific Northwest, diets of elk (Cervus elaphus roosevelti) and deer (Odocoileus hemionus columbianus) are dominated by shrubs, ferns, and forbs solution17,18 or agarose gel.19 In this paper, we refer to the capacity to precipitate proteins as astringency.20...
Subcutaneous implantation of satellite transmitters with percutaneous antennae into male polar bears (Ursus maritimus)
Daniel M. Mulcahy, Gerald W. Garner
1999, Journal of Zoo and Wildlife Medicine (30) 510-515
Male polar bears (Ursus maritimus) have not been successfully instrumented with satellite transmitters because they readily shed collar-mounted transmitters. Seven male polar bears were captured on the pack ice off the northern coast of Alaska and surgically implanted with satellite transmitters with percutaneous antennae into the subcutaneous space of the...
Zebra mussel filter feeding and food-limited production of Daphnia: Recent changes in lower trophic level dynamics of Oneida Lake, New York, U.S.A.
M.J. Horgan, E.L. Mills
1999, Hydrobiologia (411) 79-88
Exotic zebra mussels can alter lower trophic level dynamics in lakes that they colonize by consuming large quantities of phytoplankton. We simulated the indirect effects of zebra mussel grazing on Daphnia by artificially reducing phytoplankton concentration for in situ Daphnia reproduction experiments. The response of Daphnia reproduction to reduced phytoplankton...
