Sex ratios of canvasbacks wintering in Louisiana
Dennis W. Woolington
1993, Journal of Wildlife Management (57) 751-758
Disparate sex ratios in waterfowl are considered indicative of differential survival between the sexes and may limit reproductive potential. Because other studies have shown canvasbacks (Aythya valisineria) have highly skewed sex ratios, I examined aerial photographs from surveys flown monthly during winters 1987-88 and 1988-89 to determine sex ratios of...
Water resources data, Oklahoma, water year 1992. Volume 1. Arkansas River basin
1993, Water Data Report OK-92-1
No abstract available. ...
Differentiation of volcanic ash-fall and water-borne detrital layers in the Eocene Senakin coal bed, Tanjung Formation, Indonesia
Leslie F. Ruppert, T.A. Moore
1993, Organic Geochemistry (20) 233-247
The Sangsang deposit of the Eocene Senakin coal bed, Tanjung Formation, southeastern Kalimantan, Indonesia, contains 11 layers, which are thin (<5 cm) and high in ash (> 70%). These layers are characterized by their pelitic macroscopic texture. Examination of eight of the layers by scanning-electron microscopy, energy-dispersive X-ray, and X-ray...
Comparison of the petrography, palynology and paleobotany of the Stockton coal bed, West Virginia and implications for paleoenvironmental interpretations
Brenda Pierce, R.W. Stanton, Cortland F. Eble
1993, Organic Geochemistry (20) 149-166
The Stockton coal bed (Middle Pennsylvanian) is a relatively high ash coal composed primarily of moderately thin banded, sparsely thin banded, and nonbanded coal (splint and cannel coal). Comparisons of petrographic, palynologic, and paleobotanic data gathered from the same sample sets from a single column of the Stockton coal bed...
The Beaufort Sea continental shelf as a seasonal source of atmospheric methane
Keith A. Kvenvolden, Marvin D. Lilley, Thomas Lorenson, P. W. Barnes, E. McLaughlin
1993, Geophysical Research Letters (20) 2459-2462
Methane concentrations in the Beaufort Sea under the winter ice canopy offshore from northern Alaska are 3 to 28 times greater than they are in late summer when the ice is absent in a similar region offshore from northern Canada where methane is in approximate equilibrium with the atmosphere. These...
Detection of contaminant plumes by bore hole geophysical logging
Thomas J. Mack
1993, Groundwater Monitoring & Remediation (13) 107-114
Two borehole geophysical methods—electromagnetic induction and natural gamma radiation logs—were used to vertically delineate landfill leachate plumes in a glacial aquifer. Geophysical logs of monitoring wells near two land-fills in a glacial aquifer in west-central Vermont show that borehole geophysical methods can aid in interpretation of geologic logs and placement...
Stable carbon and oxygen isotope studies of the sediments of Elk Lake, Minnesota
Walter E. Dean, Minze Stuiver
1993, GSA Special Papers (276) 163-180
Variations in the ratios of 18O:16O and 13C:12C in calcite throughout the Holocene in Elk Lake, Minnesota, are recorded in three varve-calibrated carbonate cores. Marl in a varved deep-basin (29.6 m) core consists mainly of calcite precipitated from surface waters during the summer and probably provides the least complicated isotope record. Marl...
Modern sedimentation in Elk Lake, Clearwater County, Minnesota
E.B. Nuhfer, R.Y. Anderson, J. Platt Bradbury, Walter E. Dean
1993, GSA Special Papers (276) 96
The varved sediments of Elk Lake, Clearwater County, Minnesota, contain a 10,000 year record of climatic and limnologic events. Sediment traps deployed in the lake’s water column from 1979 to 1981 and from 1983 to 1984 collected samples that permitted us to identify materials, to see the timing of sedimentation...
Chronology of Elk Lake sediments: Coring, sampling, and time-series construction
R.Y. Anderson, J. Platt Bradbury, Walter E. Dean, Minze Stuiver
1993, GSA Special Papers (276) 37-43
A 22 m series of cores from a continuously laminated sequence of postglacial sediment was recovered from 29.6 m of water from the deepest part of Elk Lake, Clearwater County, Minnesota, by piston and freeze-coring methods during the winters of 1978 and 1982. A varve time series constructed and used...
Elk Lake in perspective
R.Y. Anderson, Walter E. Dean, J. Platt Bradbury
1993, GSA Special Papers (276) 1-6
Elk Lake is located in the forested region of north-central Minnesota at the headwaters of the Mississippi River and occupies one of countless basins left behind as the last great Pleistocene ice sheet retreated northward into Canada. In this respect it resembles many other moderately deep, dimictic, hard-water lakes in...
Climatic and limnologic setting of Elk Lake
R.O. Megard, J. Platt Bradbury, Walter E. Dean
1993, GSA Special Papers (276) 19-36
Elk Lake is located on the Itasca moraine near the source of the Mississippi River in northwestern Minnesota. The basin is in calcareous glacial drift, and the lake water is a dilute solution of calcium and magnesium bicarbonate. Low-magnesian calcite formed by precipitation from the lake water has been a...
Environment of deposition of CaCO3 in Elk Lake, Minnesota
Walter E. Dean, R.O. Megard
1993, GSA Special Papers (276) 97-113
Elk Lake is near the present forest-prairie border in northwestern Minnesota, and is also located on the boundary between hard-water lakes that are typical of once-glaciated parts of the north-central United States and more saline prairie lakes of western Minnesota and the Dakotas. The sediments of the prairie lakes just...
Hydrologic budget and nitrogen distribution for an agricultural study plot in claypan soil and glacial till near Centralia, Mo.--May 1991 to May 1992
Brian P. Kelly, L.N. Plummer
1993, Book chapter, Proceedings from the 3rd annual Missouri water quality conference
No abstract available. ...
Denitrification measurements in aquatic sediments: A comparison of three methods
Sybil P. Seitzinger, Lars Peter Nielsen, Jane Caffrey, Peter Bondo Christensen
1993, Biogeochemistry (23) 147-167
Measurements of denitrification using the acetylene inhibition,15N isotope tracer, and N2 flux methods were carried out concurrently using sediment cores from Vilhelmsborg sø, Denmark, in an attempt to clarify some of the limitations of each technique. Three experimental treatments of overlying water were used: control, nitrate enriched, and ammonia enriched water....
Conterminous U.S. land cover characteristics data set 1990 prototype
Water Resources Division, U.S. Geological Survey
1993, Report
No abstract available....
Conterminous U.S. AVHRR companion disc: USA-USGS-EDC-AVHRR-9502
Water Resources Division, U.S. Geological Survey
1993, Report
No abstract available....
Managing reservoir storage for instream slow
T. J. Waddle
1993, Book, American Society of Civil Engineers Water Resources Planning and Management Division Conference Proceedings
No abstract available....
Options for water-level control in developed wetlands
J. R. Kelley Jr., M. K. Laubhan, F. A. Reid, J. S. Wortham, L. H. Fredrickson
1993, Book chapter, Waterfowl management handbook
Wetland habitats in the United States currently are lost at a rate of 260,000 acres/year (105,218 ha/year). Consequently, water birds concentrate in fewer and smaller areas. Such concentrations may deplete food supplies and influence behavior, physiology, and survival. Continued losses increase the importance of sound management of...
National Atlas Maps
Water Resources Division, U.S. Geological Survey
1993, Report
The National Atlas of the United States of America was published by the U.S. Geological Survey in 1970. Its 765 maps and charts are on 335 14- by 19-inch pages. Many of the maps span facing pages....
Integrating geographic information systems for water resources research (stage I) in the National Parks
M. J. Paulson, R. Herrmann
1993, Report, Proceedings of the Symposium on Geographic Information Systems and Water Resources
No abstract available....
Photogrammetric determination of alpine snowpack distribution for initialization of a watershed simulation system
D. W. Cline, Jill Baron
1993, Eos, Transactions, American Geophysical Union (74)
No abstract available....
Water Resources Data, Virginia, Water Year 1992. Volume 2: Ground-Water Level and Ground-Water Quality Records
Byron J. Prugh Jr., Eugene D. Powell
1993, Water Data Report VA-92-2
Water-resources data for the 1992 water year for Virginia consist of records of water levels and water quality of ground-water wells. This report (Volume 2. Ground-Water-Level and Ground-Water-Quality Records) contains water levels at 356 observation wells and water quality at 2 wells. Locations of these wells are shown on figures...
Surface water chemistry and hydrology of two subalpine watersheds in Rocky Mountain National Park, Colorado
J. K. Sueker
1993, Eos, Transactions, American Geophysical Union (74) 266-268
No abstract available....
Instream flows according to the ASCE model water code
G. W. Sherk, Berton L. Lamb
1993, Book, Proceedings of the Water Planning and Management Division
No abstract available....
Winter phytoplankton dynamics in a subalpine lake, Colorado, U.S.A
S. A. Spaulding, J. V. Ward, Jill Baron
1993, Archiv fuer Hydrobiologie (129) 179-198
The temporal dynamics of phytoplankton were examined in The Loch, a subalpine lake in Rocky Mountain National Park, over the winter seasons of 1987-88 and 1988-89. The Loch was ice-covered from early November until early to mid May. The pattern of phytoplankton biovolume during ice-cover was consistent between the two...
