Microfaunal evidence for elevated Pliocene temperatures in the Arctic Ocean
Thomas M. Cronin, Robin Whatley, Adrian Wood, Akira Tsukagoshi, Noriyuki Ikeya, Elisabeth M. Brouwers, W. M. Briggs Jr.
1993, Paleoceanography and Paleoclimatology (8) 161-173
The migration of thermophilic marine Ostracoda into the Arctic Ocean during the Pliocene indicates that winter and summer ocean temperatures around Arctic margins were ≥ 0 °C and > 3 °C, respectively, and that ice-free conditions existed for most or all of the Arctic. By at least 3.5–3.0 Ma, probably...
Genetic conversion of a fungal plant pathogen to a non-pathogenic, endophytic mutualist
Stanley Freeman, Rusty J. Rodriguez
1993, Science (260) 75-78
The filamentous fungal ascomycete Colletotrichum magna causes anthracnose in cucurbit plants. Isolation of a nonpathogenic mutant of this species (path-1) resulted in maintained wild-type levels of in vitro sporulation, spore adhesion, appressorial formation, and infection. Path-1 grew throughout host tissues as an endophyte and retained the wild-type host range, which...
Reproductive characteristics of female sea otters
Ronald J. Jameson, Ancel M. Johnson
1993, Marine Mammal Science (9) 156-167
Several important aspects of reproduction in the female sea otter, such as gestation, pupping frequency, period of pup dependency, and annual pupping rate, were unclear when this study was begun. We present data from 75 tagged adult females that indicate gestation is variable, but on average is about 6 months,...
The influence of long term climate change on net titration at Yucca Mountain, Nevada
A. L. Flint, L. E. Flint, J.A. Hevesi
1993, Conference Paper, High level radioactive waste management
No abstract available ...
Determination of mono- and non-o,o′-chlorine substituted polychlorinated biphenyls in Aroclors and environmental samples
Ted R. Schwartz, Donald E. Tillitt, Kevin P. Feltz, Paul H. Peterman
1993, Chemosphere (26) 1443-1460
High resolution capillary gas chromatography (GC) is the best known technique for the separation of complex mixtures; however, no single GC column has yet separated all 209 congeners of polychlorinated biphenyls (PCBs). A number of coeluting PCB congener pairs exist, and even under favorable separation conditions such as with multidimensional...
Synthesis of Cretaceous/fertiary boundary studies at Hole 807C
Richard M. Corfield, William V. Sliter, Isabella Premolia Silva, John A. Tarduno, Roman A. Schmitt, Yun-Gang Liu, Sherwood W. Wise Jr., Shaozhi Mao, Julie E. Cartlidge, Wolf H. Berger
1993, Conference Paper, Proceedings of the Ocean Drilling Program Scientific Results
Paleontological, stable isotopic, trace elemental abundance, and magnetostratigraphic studies have been performed on limestones spanning the Cretaceous/Tertiary boundary transition at Ocean Drilling Program (ODP) Hole 807C. Paleontological evidence exists for considerable resedimentation, which we attribute to the fact that Hole 807C is located in a basement graben. Age estimates based...
Confirmation of rate-dependent behavior in water retention during drainage in nonswelling porous materials
Jim Constantz
1993, Water Resources Research (29) 1331-1334
In the water retention process in porous material, changes in water content are assumed to be independent of the rate at which the matric potential varies. Periodically, researchers have presented results that do not support this assumption, indicating that water retention may be rate-dependent under certain conditions. In the present...
Measurement of scour at selected bridges in New York
G.K. Butch
1993, Conference Paper, Geologic complexities in the high way environment
No abstract available ...
Late Maastrichtian and Danian ostracode faunas from Northern Alaska; reconstructions of environment and paleogeography
Elisabeth M. Brouwers, Patrick De Deckker
1993, Palaios (8) 140-154
No abstract available. ...
Restoration of lowland streams: an introduction
L.L. Osborne, P.B. Bayley, L.W.G. Higler, B. Statzner, F. Triska, T. Moth Iverson
1993, Freshwater Biology (29) 187-194
This paper introduces the Lowland Streams Restoration Workshop that was held in Lund, Sweden in August 1991.Attenders at the Workshop participated in working groups which discussed and reported on the state of knowledge of stream restoration and identified critical areas of information need. Currently, most restoration efforts are emission‐orientated (i.e....
Relative effects of nutrient enrichment and grazing on epiphyte-macrophyte (Zostera marina L.) dynamics
Hilary A. Neckles, R. L. Wetzel, R.J. Orth
1993, Oecologia (93) 285-295
The independent and interactive effects of nutrient concentration and epiphyte grazers on epiphyte biomass and macrophyte growth and production were examined in Zostera marina L. (eelgrass) microcosms. Experiments were conducted during early summer, late summer, fall, and spring in a greenhouse on the York River estuary of Chesapeake Bay. Nutrient...
Earthquake prediction lessons from Parkfield Experiment
Andrew J. Michael, John O. Langbein
1993, Eos Science News (74) 145-155
In 1985, the National Earthquake Prediction Evaluation Council (NEPEC), and later its California counterpart (CEPEC), approved an earthquake prediction for the first time. This was the Bakun and Lindh [1985] forecast, with 95% confidence, that an M = 5.5 to 6 earthquake would rupture along the San Andreas fault near the town...
Integrated wetland management: concepts and opportunities
M. K. Laubhan, L. H. Fredrickson
1993, Book, Transactions of the 58th North American Wildlife and Natural Resources Conference
No abstract available....
Interactive coupling of a lake thermal model with a regional climate model
Steven W. Hostetler, G. T. Bates, F. Giorgi
1993, Journal of Geophysical Research-Atmospheres (98) 5045-5057
A one‐dimensional model of lake temperature, evaporation, and ice has been coupled in an interactive mode with the climate version of the National Center for Atmospheric Research/Pennsylvania State University regional (mesoscale) atmospheric model (MM4). The coupled MM4‐lake model makes possible high‐resolution simulations of climate in the proximity of large water...
Streamflow and sediment dynamics of the Middle Rio Grande Valley, New Mexico, in the context of cottonwood recruitment
Robert T. Milhous, Mark Wondzell, Amy Ritter
1993, Report
The cottonwood gallery forests of the Middle Rio Grande floodplain in New Mexico provide important habitats for birds and other animals. Over the last century, these forests have changed significantly due to invasion of exotics such as salt cedar and Russian olive, which compete with native cottonwoods, and changes...
Status and population trends of Hawaii's native waterbirds, 1977-1987
Andrew Engilis Jr., Thane K. Pratt
1993, The Wilson Bulletin (105) 142-158
Status and population trends of Hawaiis ’ native waterbirds were examined from 1977 through 1987. Waterbird population fluctuations were analyzed in relation to rainfall and land use dynamics. Numbers of Hawaiian Duck (Koloa) (Anus wyvilliana) and Hawaiian Common Moorhen (Gallinula chloropus sandvicensis) appeared stable over time; however, surveys were limited....
Small fields in the National Oil and Gas Assessment
David H. Root, Emil Attanasi
1993, American Association of Petroleum Geologists Bulletin (77) 485-490
In the 1989 National Oil and Gas Assessment prepared by the U.S. Geological Survey (USGS) and the Minerals Management Service, undiscovered oil and gas resources in small fields were assessed separately from resources in fields containing more than 1 million bbl of oil equivalent. This paper concerns the USGS Part...
Reproductive ecology of Dusky Flycatchers in western Montana
James A. Sedgwick
1993, The Wilson Bulletin (105) 84-92
Breeding ecology of Dusky Flycatchers (Empidonax oberholseri) was studied in western Montana from May-August 1974. Dusky Flycatchers were monogamous and single-brooded although some pairs made renesting attempts after first nests failed. Length of the reproductive cycle for first nesting attempts, from arrival on the breeding grounds to fledging,...
Simulation testing of unbiasedness of variance estimators
William A. Link
1993, American Statistician (47) 132-134
In this article I address the evaluation of estimators of variance for parameter estimates. Given an unbiased estimator X of a parameter θ, and an estimator V of the variance of X, how does one test (via simulation) whether V is an unbiased estimator of the variance of X? The derivation of the test statistic illustrates the need for...
Radium isotope geochemistry of thermal waters, Yellowstone National Park, Wyoming, USA
N.C. Sturchio, John K. Bohlke
1993, Geochimica et Cosmochimica Acta (57) 1203-1214
Radium isotope activities (226Ra, 228Ra, and 224Ra), chemical compositions, and sulfur isotope ratios in sulfate were determined for water samples from thermal areas in Yellowstone National Park, Wyoming. Activities of 226Ra in these waters range from <0.2 to 37.9 dpm/kg. Activity ratios of 228Ra226Ra">228Ra226Ra range from 0.26 to 14.2,...
A methodology for quantifying and valuing the impacts of flow changes on a fishery
David A. Harpman, Edward W. Sparling, Terry J. Waddle
1993, Water Resources Research (29) 575-582
A quasi-population model for adult brown trout was developed for the Taylor River below the Taylor Park Reservoir in Colorado. This model allows the population to be predicted under alternative flow management regimes. The predicted population effects of two different flow release patterns were compared with the predicted...
Biochemical and ultrastructural evidence for the origin of whiting: a biologically induced calcium carbonate precipitation mechanism: reply
G.M. Friedman, Lisa L. Robbins, P. L. Blackwelder
1993, Geology (21) 287-288
No abstract available....
Polyphosphate present in DNA preparations from fungal species of Collectotrichum inhibits restriction endonucleases and other enzymes
R. J. Rodriguez
1993, Analytical Biochemistry (209) 291-297
During the development of a procedure for the isolation of total genomic DNA from filamentous fungi (Rodriguez, R. J., and Yoder, 0. C., Exp. Mycol. 15, 232-242, 1991) a cell fraction was isolated which inhibited the digestion of DNA by restriction enzymes. After elimination of DNA, RNA, proteins, and lipids,...
Chlorine-36 in the Snake River Plain Aquifer at the Idaho National Engineering Laboratory; origin and implications
T.M. Beasley, L.D. Cecil, P. Sharma, P.W. Kubik, Udo Fehn, L. J. Mann, H.E. Gove
1993, Groundwater (31) 302-310
Between 1952 and 1984, low-level radioactive waste was introduced directly into the Snake River Plain aquifer at the Idaho National Engineering Laboratory (INEL), Idaho Falls, Idaho. These wastes were generated, principally, at the nuclear fuel reprocessing facility on the site. Our measurements of 36C1 in monitoring and production well waters,...
Nature of migrabitumen and their relation to regional thermal maturity, Ouachita Mountains, Oklahoma
Brian J. Cardott, Tim E. Ruble, Neil H. Suneson
1993, Energy Sources (15) 239-267
Two grahamite and three impsonite localities are within an 82-km-long segment of the Ouachita Mountains of southeastern Oklahoma. Grab samples were collected to study the petrographic and geochemical characteristics of the migrabitumen at the grahamite-impsonite transition and the relation of the migrabitumen to the regional thermal maturity pattern.Maximum and random...
