Geochemical evidence for enhanced preservation of organic matter in the oxygen minimum zone of the continental margin of northern California during the Late Pleistocene
Walter E. Dean, James V. Gardner, Roger Y. Anderson
1994, Paleoceanography (9) 47-61
The present upper water mass of the northeastern Pacific Ocean off California has a well-developed oxygen minimum zone between 600 and 1200 m wherein concentrations of dissolved oxygen are less than 0.5 mL/L. Even at such low concentrations of dissolved oxygen, benthic burrowing organisms are abundant enough to thoroughly bioturbate...
Wildlife association with human‐altered water sources in semiarid vegetation communities
D.W. Burkett, B.C. Thompson
1994, Conservation Biology (8) 682-690
Based on common use in wildlife management, we hypothesized that human‐constructed water sources influence faunal communities detectably compared to similar habitats that lack water. We examined 20 wildlife water units and 20 paired comparison sites without water from April to August 1992 in semiarid southern New Mexico to assess animal...
Instream flows to assist the recovery of endangered fishes of the upper Colorado River basin
J. A. Stanford
1994, Biological Report (24) 47-47
The riverine landscape of the upper Colorado River basin has been extensively modified by dams, diversions, revetments, and water abstractions. These changes, probably coupled with the introduction of many nonnative fishes, have compromised the existence of four of the native fishes (Colorado River squawfish Ptychocheilus lucius, humpback chub Gila cypha,...
Habitat use by an endangered riverine fish and implications for species protection
B. J. Freeman, Mary Freeman
1994, Ecology of Freshwater Fish (3) 49-58
We investigated habitat specificity of the amber darter (Percina antesella Williams & Etnier 1977), an imperiled fish from restricted portions of 2 rivers in the southeastern United States. Foraging amber darters occupied a narrow range of riffle habitat, consistently avoiding areas < 20 cm deep and with velocity < 10 cm....
Evaluation of effects caused by high copper concentrations in Torch Lake, Michigan, on reproduction of yellow perch
S.A. Ellenberger, Paul C. Baumann, Thomas W. May
1994, Journal of Great Lakes Research (20) 531-536
Elevated concentrations of copper are present in Torch Lake, Michigan, an Environmental Protection Agency Superfund site. The sauger (Stizostedion canadense) population in Torch Lake has been extirpated and walleye (Stizostedion vitreum) populations are maintained by stocking. We used yellow perch (Perca flavescens) to determine if chronic exposure to elevated copper...
Body composition dynamics of ruddy ducks during wing moult
W.L. Hohman
1994, Canadian Journal of Zoology (71) 2224-2228
A method was developed for indexing moulting costs in waterfowl based on intensity of moult and proportional mass of feathers in seven feather regions (ADJMOLT). This method was then applied to an examination of relations between moulting costs and size-adjusted body mass and composition of postbreeding male and female ruddy...
500,000-year stable carbon isotopic record from Devils Hole, Nevada
T.B. Coplen, I.J. Winograd, J.M. Landwehr, A.C. Riggs
1994, Science (263) 361-365
The record of carbon-13 (δ13C) variations in DH-11 vein calcite core from Devils Hole, Nevada, shows four prominent minima near glacial terminations (glacial-interglacial transitions) V to II. The δ13C time series is inversely correlated with the DH-11 oxygen isotope ratio time series and leads it by as much as 7000...
Hydrology and quality of ground water in northern Thurston County, Washington
N. P. Dion, G. L. Turney, M. A. Jones
1994, Water-Resources Investigations Report 92-4109
Northern Thurston County is underlain by as much as 1,000 feet of unconsolidated deposits of Pleistocene Age, that are of both glacial and nonglacial origin. Interpretation of 17 geologic sections led to the delineation of 7 major geohydrologic units, 3 of which constitute aquifers in the area. Precipitation ranges from...
Varve calibrated records of carbonate and organic carbon accumulation over the last 2000 years in the Black Sea
Michael A. Arthur, Walter E. Dean, E.D. Neff, B.J. Hay, J. King, Glenn A. Jones
1994, Global Biogeochemical Cycles (8) 195-217
Sedimentologic and geochemical studies of box and gravity cores recovered from the Black Sea during the first leg of a multileg international Black Sea expedition in 1988 allow reconstruction of the basinwide Holocene environmental history of the Black Sea. In the deeper parts of the basin, box cores typically recovered...
40Ar/39Ar chronology and volcanology of silicic volcanism in the Davis Mountains, Trans-Pecos Texas
Christopher D. Henry, Michael J. Kunk, W. C. McIntosh
1994, GSA Bulletin (106) 1359-1376
Field studies and 40Ar/39Ar dating reveal that silicic volcanism in the Davis Mountains part of the Trans-Pecos Texas volcanic field occurred in six episodes at 0.3 m.y. intervals between 36.8 and 35.3 Ma. Additionally, two groups of silicic intrusions were emplaced at 34.6 and 32.8 Ma. This episodicity is similar to...
Fate and pathways of injection-well effluent in the Florida Keys
Eugene A. Shinn, Ronald S. Reese, Christopher D. Reich
1994, Open-File Report 94-276
Twenty-four wells (21 locations) were core drilled into the limestone beneath the Keys, reef tract, and outer reefs to determine if sewage effluents injected in Class V wells onshore are reaching offshore reef areas via underground flow. These wells were fitted with PVC casings and well screens and were...
Velocities of the Smith Glacier Ice Tongue and Dotson Ice Shelf, Walgreen Coast, Marie Byrd Land, West Antarctica
Baerbel K. Lucchitta, Kevin F. Mullins, C. E. Smith, Jane G. Ferrigno
1994, Annals of Glaciology (20) 101-109
Velocity measurements were made for two time intervals on the Smith Glacier ice tongue (1973–88 and 1988–90) and three on the Dotson Ice Shelf (1972–88, 1973–88 and 1988–90). The Smith Glacier ice tongue velocities for the two intervals are similar near the grounding line but show a progressive increase toward...
Nutrient additions by waterfowl to lakes and reservoirs: predicting their effects on productivity and water quality
Bruce A. Manny, W.C. Johnson, R.G. Wetzel
1994, Hydrobiologia (279/280) 121-132
Lakes and reservoirs provide water for human needs and habitat for aquatic birds. Managers of such waters may ask whether nutrients added by waterfowl degrade water quality. For lakes and reservoirs where primary productivity is limited by phosphorus (P), we developed a procedure that integrates annual P loads...
Occurrence and yields of triazine herbicides in the Susquehanna river and tributaries during base-flow conditions in the Lower Susquehanna River Basin, Pennsylvania and Maryland, June 1993
Kevin J. Breen, Andrew J. Gavin, Ronald R. Schnabel
1994, Book, Toward a sustainable watershed: the Chesapeake experiment, proceedings of the 1994 Chesapeake research conference, Norfolk, Virginia, June 1-3, 1994
No abstract available....
The geochemistry of hot spring waters at Norris Geyser Basin, Yellowstone National Park
Robert O. Fournier, J. Michael Thompson, Roderick A. Hutchinson
1994, Conference Paper, Geothermal Resources Council Transactions
Eastern Municipal Water District RO treatment/saline vegetated wetlands pilot study
B. Boegli, J. Thullen
1994, Currents: Developing Technology for Tomorrow's Challenges (Spring/Summer) 6-10
No abstract available....
Evaluation of tire reefs for enhancing aquatic communities in concrete-lined canals
Gordon Mueller, Charles R. Liston
1994, North American Journal of Fisheries Management (14) 616-625
Large earthen canals in the arid southwest are being lined with concrete to reduce seepage and conserve limited water supplies. Lining reduces habitat and increases operational velocities (relative to unaltered streams), which are detrimental to aquatic communities. Fish communities that become reestablished in these waterways exhibit lower species...
A program to maintain the endangered razorback suckers in a highly modified riverine habitat
G. Mueller, T. Burke, M. Horn
1994, Book, Environmental Enhancement of Water Projects, Proceedings of the 1993 seminar
No abstract available....
Managing reservoir storage for fish production
T. J. Waddle, J. Sandelin
1994, Book, Water policy and management: Solving the Problems
No abstract available....
Coastal wetlands and sediments of the San Francisco Bay system
Water Resources Division, U.S. Geological Survey, John R. Dingler
1994, Report
Selected issues in the USGS Marine and Coastal Geology Program....
CIMRI, Center for Inter-American Mineral Resource Investigations: a focal point for the exchange of minerals information on Latin America and the Caribbean.
Water Resources Division, U.S. Geological Survey
1994, Report
No abstract available....
Chemical, isotopic, and dissolved gas compositions of the hot springs of the Owyhee Uplands, Malheur County, Oregon
Robert H. Mariner, H.W. Young, William C. Evans
Dennis L. Nielson, editor(s)
1994, Restructuring the geothermal industry (18) 221-228
Hot springs along the Owyhee River in southeastern Oregon between Three Forks and Lake Owyhee could be part of a north flowing regional system or a series of small separate geothermal systems Heat for the waters could be from a very young (Holocene) volcanic activity (basalt flows) of the Owyhee...
Analysis of nitrogen saturation potential in Rocky Mountain tundra and forest: implications for aquatic systems
Jill S. Baron, Dennis S. Ojima, Elisabeth A. Holland, William J. Parton
1994, Biogeochemistry (27) 61-82
We employed grass and forest versions of the CENTURY model under a range of N deposition values (0.02–1.60 g N m−2 y−1) to explore the possibility that high observed lake and stream N was due to terrestrial N saturation of alpine tundra and subalpine forest in Loch Vale Watershed, Rocky...
Monitoring long-term watershed/ecosystem change for preserved lands
R. Herrmann
1994, Book, Proceedings of Watershed '93
No abstract available....
Long-term ecosystem and watershed change: U.S./Russia bilateral research at the OKA Reserve, Russia
R. Herrmann, Y. Puzachenko, L. R. Boring, A. Sankovsky, R. Pierce
1994, Book, Global regional issues in environmental hydrology: Proceedings of the second USA/CIS conference on environmental hydrology and hydroecology
No abstract available....
