Transformations of snow chemistry in the boreal forest: Accumulation and volatilization
J.W. Pomeroy, T.D. Davies, H.G. Jones, P. Marsh, N.E. Peters, M. Tranter
1999, Hydrological Processes (13) 2257-2273
This paper examines the processes and dynamics of ecologically-important inorganic chemical (primarily NO3-N) accumulation and loss in boreal forest snow during the cold winter period at a northern and southern location in the boreal forest of western Canada. Field observations from Inuvik, Northwest Territories and Waskesiu, Saskatchewan, Canada were used...
Regional hydrology of the Dixie Valley geothermal field, Nevada: preliminary interpretations of chemical and isotopic data
Gregory Nimz, Cathy Janik, Fraser Goff, Charles Dunlap, Mark Huebner, Dale Counce, Stuart D. Johnson
1999, Book chapter, Global geothermal resources: sustainable energy for the future
Chemical and isotopic analyses of Dixie Valley regional waters indicated several distinct groups ranging in recharge age from Pleistocene (1000a). Geothermal field fluids (~12-14 ka) appear derived from water similar in composition to non thermal groundwater observed today in valley artesian well (also ~14 ka). Geothermal fluid interaction with mafic...
Flow-path textures and mineralogy in tuffs of the unsaturated zone
Schon Levy, Steve Chipera, Giday WoldeGabriel, June Fabryka-Martin, Jeffrey Roach, Donald S. Sweetkind
William C. Haneberg, Peter S. Mozley, J. Casey Moore, Laurel B. Goodwin, editor(s)
1999, Book chapter, Faults and subsurface fluid flow in the shallow crust
The high concentration of chlorine-36 (36Cl) produced by above-ground nuclear tests (bomb-pulse) provides a fortuitous tracer for infiltration during the last 50 years, and is used to detect fast flow in the unsaturated zone at Yucca Mountain, Nevada, a thick deposit of welded and nonwelded tuffs. Evidence of fast flow...
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...
Mortality of zebra mussel, Dreissena polymorpha, veligers during downstream transport
Thomas G. Horvath, Gary A Lamberti
1999, Freshwater Biology (42) 69-76
1. Streams flowing from lakes which contain zebra mussels, Dreissena polymorpha, provide apparently suitable habitats for mussel colonization and downstream range expansion, yet most such streams contain few adult mussels. We postulated that mussel veligers experience high mortality during dispersal via downstream transport. They tested this hypothesis in Christiana Creek, a...
Analysis of stress-induced oval fractures in a borehole at Deep Sea Drilling Project Site 504, eastern equatorial Pacific
R. H. Morin, R. Flamand
1999, Journal of Geophysical Research B: Solid Earth (104) 2767-2775
Deep Sea Drilling Project (DSDP) Hole 504B is located in the eastern equatorial Pacific Ocean and extends to a total depth of 2111 m beneath the seafloor (mbsf). Several acoustic televiewer logs have been obtained in this well during successive stages of drilling, and the resulting digital images have revealed...
Calculation of broadband time histories of ground motion: Comparison of methods and validation using strong-ground motion from the 1994 Northridge earthquake
S. Hartzell, S. Harmsen, A. Frankel, S. Larsen
1999, Bulletin of the Seismological Society of America (89) 1484-1504
This article compares techniques for calculating broadband time histories of ground motion in the near field of a finite fault by comparing synthetics with the strong-motion data set for the 1994 Northridge earthquake. Based on this comparison, a preferred methodology is presented. Ground-motion-simulation...
Response of high-elevation forests in the Olympic Mountains to climatic change
A.N. Zolbrod, D. L. Peterson
1999, Canadian Journal of Forest Research (29) 1966-1978
The gap model ZELIG was used to examine the effects of increased temperature (2°C) and altered precipitation on high-elevation ecosystems of the Olympic Mountains, Washington, U.S.A. Changes in tree species distribution and abundance, as well as stand biomass, were examined on north and south aspects in the dry northeast (NE)...
Long-term prairie falcon population changes in relation to prey abundance, weather, land uses, and habitat conditions
Karen Steenhof, Michael N. Kochert, L.B. Carpenter, Robert N. Lehman
1999, The Condor (101) 28-41
We studied a nesting population of Prairie Falcons (Falco mexicanus) in the Snake River Birds of Prey National Conservation Area (NCA) from 1974-1997 to identify factors that influence abundance and reproduction. Our sampling period included two major droughts and associated crashes in Townsend's ground squirrel (Spermophilus townsendii) populations. The number...
Tritium and 14C concentrations in unsaturated-zone gases at test hole UZB-2, Amargosa Desert Research Site, 1994-98: A section in U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)>
David E. Prudic, Robert G. Striegl, Richard W. Healy, Robert L. Michel, Herbert Haas
David W. Morganwalp, Herbert T. Buxton, editor(s)
1999, Report, U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)
Tritium concentrations have been determined yearly since April 1994 from water-vapor samples collected at test hole UZB-2. The hole was drilled about 100 m (meters) south of the southwest corner of a commercial burial site for low-level radioactive wastes in September 1993. UZB-2 is equipped with ten 2.5-cm (centimeters) diameter...
Soil respiration at the Amargosa Desert Research site: A section in U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)
Alan C. Riggs, Robert G. Striegl, Florentino B. Maestas
David W. Morganwalp, Herbert T. Buxton, editor(s)
1999, Report, U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)
Automated opaque flux-chamber measurements of soil carbon dioxide (CO2) flux (soil respiration) into the atmosphere at the Amargosa Desert Research Site show seasonal and diel cycles of soil respiration that are closely linked with soil temperature and soil moisture. During 1998, soil respiration increased with soil warming through spring, reaching...
Discovery of Cnemidophorus neomexicanus in Arizona
Trevor Persons, John W. Wright
1999, Herpetological Review (30) 207-209
The parthenogenetic whiptail lizard Cnemidophorus neomexicanus is known primarily from the vicinity of the Rio Grande Valley from Espanola, Rio Arriba Co., New Mexico south to near Candelaria, Presidio Co., Texas, and extending westward in southwestern New Mexico to west of Lordsburg, Hidalgo Co. (Fig. 1; Axtell 1966; Cole et...
Isotopic composition of water in a deep unsaturated zone beside a radioactive-waste disposal area near Beatty, Nevada
David A. Stonestrom, David E. Prudic, Robert G. Striegl
David W. Morganwalp, Herbert T. Buxton, editor(s)
1999, Report, U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)
The isotopic composition of water in deep unsaturated zones is of interest because it provides information relevant to hydrologic processes and contaminant migration. Profiles of oxygen-18 (18O), deuterium (D), and tritium (3H) from a 110-meter deep unsaturated zone, together with data on the isotopic composition of ground water...
Plasma steroid concentrations and male phallus size in juvenile alligators from seven Florida lakes
L.J. Guillette Jr., A.R. Woodward, D.A. Crain, D.B. Pickford, A. A. Rooney, H.F. Percival
1999, General and Comparative Endocrinology (116) 356-372
Neonatal and juvenile alligators from contaminated Lake Apopka in central Florida exhibit abnormal plasma sex steroid concentrations as well as morphological abnormalities of the gonad and phallus. This study addresses whether similar abnormalities occur in juvenile alligators inhabiting six other lakes in Florida. For analysis, animals were partitioned into two...
Reproductive characteristics of migratory golden eagles in Denali National Park, Alaska
Carol L. McIntyre, Layne G. Adams
1999, The Condor (101) 115-123
We describe reproductive characteristics of Golden Eagles (Aquila chrysaetos) breeding in Denali National Park, Alaska during an entire snowshoe hare (Lepus americanus) cycle, 1988-1997. Data on nesting eagles were collected at 58 to 72 nesting areas annually using two aerial surveys. Surveys were conducted during the incubation period to determine...
Tritium in water vapor in the shallow unsaturated zone at the Amargosa Desert Research Site
Richard W. Healy, Robert G. Striegl, Robert L. Michel, David E. Prudic, Brian J. Andraski
David W. Morganwalp, Herbert T. Buxton, editor(s)
1999, Report, U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)
Samples of water vapor in soil gas were obtained at the U.S. Geological Survey's Amargosa Desert Research Site in 1997 and 1998 from a depth of 1.5 m (meters) within a 300 m by 300 m grid that lies immediately to the south and west of a low-level radioactive-waste disposal...
Overview of research on water, gas, and radionuclide transport at the Amargosa Desert Research Site, Nevada: A section in U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)
Brian J. Andraski, David A. Stonestrom
David W. Morganwalp, Herbert T. Buxton, editor(s)
1999, Report, U.S. Geological Survey Toxic Substances Hydrology Program: Proceedings of the technical meeting, Charleston, South Carolina, March 8-12, 1999: Volume 3 (Part C) (WRI 99-4018C)
Studies at the U.S. Geological Survey Amargosa Desert Research Site have focused on characterizing factors and processes that control transport and fate of contaminants in arid environments. This paper summarizes research results that have been published through 1998. Results have improved understanding of water and gas movement through a thick...
Maturation, fecundity, and intertidal spawning of Pacific sand lance in the northern Gulf of Alaska
Martin D. Robards, John F. Piatt, G.A. Rose
1999, Journal of Fish Biology (54) 1050-1068
Pacific sand lance Ammodytes hexapterus in Kachemak Bay, Alaska, showed no sexual dimorphism in length-to-weight (gonad-free) ratio or length-at-age relationship. Most matured in their second year, males earlier in the season than females, but females (31%) attained a higher gonadosomatic index than males (21%). Sand lance spawned intertidally once each...
Reproductive biology and juvenile recruitment of the shinyrayed pocketbook, Lampsilis subangulata (Bivalvia: Unionidae) in the Gulf Coastal Plain
C. A. O’Brien, Jayne Brim-Box
1999, American Midland Naturalist (142) 129-140
The reproductive biology, glochidial morphology and recruitment of the federally endangered shinyrayed pocketbook, Lampsilis subangulata, were studied from May 1995 to July 1996 in the Flint River system, Georgia. Gravid female L. subangulata were found nine months of the year. On 19 May 1995, a L. subangulata was discovered releasing a superconglutinate,...
Structural domains and their potential impact on recharge to intermontane-basin aquifers
G.C. Ohlmacher
1999, Environmental & Engineering Geoscience (5) 61-71
Variations in the structures exposed in structural domains associated with faults can affect the amount of ground-water recharge to fractured rock aquifers supplying intermontane-basin aquifers. In the southwestern Franklin Mountains, El Paso, Texas, an outcrop of the Ordovician Scenic Drive Formation exposes a group of structures including faults, joints, and...
Population demographics and genetic diversity in remnant and translocated populations of sea otters
James L. Bodkin, Brenda E. Ballachey, M. A. Cronin, K.T. Scribner
1999, Conservation Biology (13) 1378-1385
The effects of small population size on genetic diversity and subsequent population recovery are theoretically predicted, but few empirical data are available to describe those relations. We use data from four remnant and three translocated sea otter ( Enhydra lutris) populations to examine relations among magnitude and duration of minimum population...
Puerto Rico – Hurricane Georges
Water Resources Division, U.S. Geological Survey
1999, Fact Sheet 040-99
Setting the stage for a sustainable Pacific salmon fisheries strategy
Donald D. MacDonald, Cleveland R. Steward, E. Eric Knudsen
E. Eric Knudsen, Cleveland R. Steward, Donald D. MacDonald, Jack E. Williams, Dudley W. Reiser, editor(s)
1999, Book chapter, Sustainable fisheries management: Pacific salmon
Salmon and steelhead Oncorhynchus spp., have been keystone species for ecosystems and human cultures of the North American Pacific coast for cons. Yet, in the past century, many populations have been greatly diminished and some are now extinct-the result of a combination of factors, including habitat loss and degradation, overfishing,...
Emperor goose Anser canagicus
Joel A. Schmutz
Janet Kear, editor(s)
1999, Book chapter, Ducks, geese, and swans
No abstract available....
Bat activity in thinned, unthinned, and old-growth forests in western Oregon
Marcia L. Humes, J. P. Hayes, Michael W. Collopy
1999, Journal of Wildlife Management (63) 553-561
Many aspects of the influences of forest management activities on bats (Chiroptera) in the Pacific Northwest are poorly known. We compared thinned and unthinned forest stands of the same age and old-growth forest stands to determine potential differences in structure and amount of use by bats. We hypothesized that activity...
