Groundwater inflow measurements in wetland systems
Randy J. Hunt, David P. Krabbenhoft, Mary P. Anderson
1996, Water Resources Research (32) 495-507
Our current understanding of wetlands is insufficient to assess the effects of past and future wetland loss. While knowledge of wetland hydrology is crucial, groundwater flows are often neglected or uncertain. In this paper, groundwater inflows were estimated in wetlands in southwestern Wisconsin using traditional Darcy's law calculations and three...
Late Paleocene Arctic Ocean shallow-marine temperatures from mollusc stable isotopes
Karen L. Bice, Michael A. Arthur, Louie Marincovich Jr.
1996, Paleoceanography (11) 241-249
Late Paleocene high-latitude (80°N) Arctic Ocean shallow-marine temperatures are estimated from molluscan δ18O time series. Sampling of individual growth increments of two specimens of the bivalve Camptochlamys alaskensis provides a high-resolution record of shell stable isotope composition. The heavy carbon isotopic values of the specimens support a late Paleocene age...
Phosphorus mobilization from littoral sediments of an inlet region in Lake Delavan, Wisconsin
W.F. James, J.W. Barko, S. J. Field
1996, Archiv fur Hydrobiologie (138) 245-257
Rates of P release from littoral sediments of the inlet region of Lake Delavan, Wisconsin, were examined in the laboratory under different redox and pH regimes using sediment systems and also in situ using sediment peppers. In the laboratory, rates of P release from sediments increased about two-fold (i.e., to...
A digital photogrammetric method for measuring horizontal surficial movements on the slumgullion earthflow, Hinsdale county, Colorado
P. S. Powers, M. Chiarle, W. Z. Savage
1996, Computers & Geosciences (22) 651-663
The traditional approach to making aerial photographic measurements uses analog or analytic photogrammetric equipment. We have developed a digital method for making measurements from aerial photographs which uses geographic information system (GIS) software, and primarily DOS-based personal computers. This method, which is based on the concept that a direct visual...
Osmium isotopes and silver as tracers of anthropogenic metals in sediments from Massachusetts and Cape Cod bays
G.E. Ravizza, Michael H. Bothner
1996, Geochimica et Cosmochimica Acta (60) 2753-2763
High concentrations of osmium (Os) and silver (Ag) and low 187Os/186Os ratios in Boston sewage make these elements sensitive tracers of the influence of sewage on marine sediments in Massachusetts and Cape Cod bays. Pristine marine sediments have Ag concentrations more than 200 times lower than sewage sludge, Os concentrations...
Crystal structures of [NEt3H]5[XCoIIW11O39]·3H2O (X = P or As)
H. T. Evans Jr., T.J.R. Weakley, G.B. Jameson
1996, Journal of the Chemical Society, Dalton Transactions 2537-2540
The orthorhombic crystal structures of [NEt3H]5[XCoIIW11O39]·3H2O for X = P and As have been determined with data collected at room temperature, and for X = P at –100 °C, using Mo-Kα radiation. For the latter the space group is Pna21, a= 21.670(11), b= 14.805(4), c= 20.393(5)Å and Z= 4. The...
Pesticides in streams draining agricultural and urban areas in Colorado
R. A. Kimbrough, D. W. Litke
1996, Environmental Science & Technology (30) 908-916
A study was conducted from April 1993 through April 1994 to describe and compare the occurrence and distribution of pesticides in streams in a small agricultural and a small urban area in Colorado. Twenty-five water samples collected at least monthly at the mouths of two tributary streams of the South...
Scientific objectives of human exploration of Mars
M. H. Carr
1996, American Astronautical Society, Scientific Technology Series (86) 515-535
While human exploration of Mars is unlikely to be undertaken for science reasons alone, science will be the main beneficiary. A wide range of science problems can be addressed at Mars. The planet formed in a different part of the solar system from the Earth and retains clues concerning compositional...
Environmental Isotope Characteristics of Landfill Leachates and Gases
Keith C. Hackley, Chao-Li Liu, D.D. Coleman
1996, Groundwater (34) 827-836
The isotopic characteristics of municipal landfill leachate and gases (carbon dioxide and methane) are unique relative to the aqueous and gaseous media in most other natural geologic environments. The δ13C of the CO2 in landfills is significantly enriched in 13C, with values as high as +20 ‰...
Water transfer projects and the role of fisheries biologists
M. R. Meador
1996, Conference Paper, Fisheries
Water transfer projects are commonly considered important mechanisms for meeting increasing water demands. However, the movement of water from one area to another may have broad ecosystem effects, including on fisheries. The Southern Division of the American Fisheries Society held a symposium in 1995 at Virginia Beach, Virginia, to discuss...
Observed discrepancy between geodolite and GPS distance measurements
J.C. Savage, M. Lisowski, W.H. Prescott
1996, Journal of Geophysical Research B: Solid Earth (101) 25547-25552
Comparison of contemporaneous measurements of 84 distances in the range of 10 to 50 km by both Global Positioning System (GPS) and Geodolite (an electro-optical distance-measuring instrument) indicates that the Geodolite measurements are systematically longer by 0.283 ± 0.100 parts per million of the measured distance. Quoted uncertainty is 1...
Cryptic trace-element alteration of Anorthosite, Stillwater complex, Montana
G.K. Czamanske, P. J. Loferski
1996, Canadian Mineralogist (34) 559-576
Evidence of cryptic alteration and correlations among K, Ba, and LREE concentrations indicate that a post-cumulus, low-density aqueous fluid phase significantly modified the trace-element contents of samples from Anorthosite zones I and II of the Stillwater Complex, Montana. Concentrations of Ba, Ca, Co, Cr, Cu, Fe, Hf, K, Li, Mg,...
The deethylatrazine/atrazine ratio as an indicator of the onset of the spring flush of herbicides into surface water of the midwestern United States
E.M. Thurman, J. D. Fallon
Hennion M.C.Albaiges J., editor(s)
1996, Conference Paper, International Journal of Environmental Analytical Chemistry
[No abstract available]...
Allocation of limited reserves to a clutch: A model explaining the lack of a relationship between clutch size and egg size
Paul L. Flint, J. Barry Grand, James S. Sedinger
1996, The Auk (113) 939-942
Lack (1967, 1968) proposed that clutch size in waterfowl is limited by the nutrients available to females when producing eggs. He suggested that if nutrients available for clutch formation are limited, then species producing small eggs would, on average, lay more eggs than species with large eggs. Rohwer (1988) argues...
Extension across Tempe Terra, Mars, from measurements of fault scarp widths and deformed craters
M.P. Golombek, K. L. Tanaka, B.J. Franklin
1996, Journal of Geophysical Research E: Planets (101) 26119-26130
Two independent methods, with no common assumptions, have been used to estimate the extension across the heavily deformed Tempe Terra province of the Tharsis region of Mars. One method uses measurements of normal fault scarp width with average scarp slope data for simple grabens and rifts on Mars to estimate...
Numerical evaluation of static-chamber measurements of soil-atmospheric gas exchange--Identification of physical processes
Richard W. Healy, Robert G. Striegl, Thomas F. Russell, Gordon L. Hutchinson, Gerald P. Livingston
1996, Soil Science Society of America Journal (60) 740-747
The exchange of gases between soil and atmosphere is an important process that affects atmospheric chemistry and therefore climate. The static-chamber method is the most commonly used technique for estimating the rate of that exchange. We examined the method under hypothetical field conditions where diffusion was the only mechanism for...
Detectability, philopatry, and the distribution of dispersal distances in vertebrates
Walter D. Koenig, Dirk H. Van Vuren, Philip N. Hooge
1996, Trends in Ecology and Evolution (11) 514-517
Dispersal is of central importance to population biology, behavioral ecology and conservation. However, because field studies are based on finite study areas, nearly all dispersal distributions for vertebrates currently available are biased, often highly so. The inadequacy of dispersal data obtained directly by traditional methods using population studies of marked...
Activity and feeding of ovigerous Dungeness crabs in Glacier Bay, Alaska
Deborah A. Schultz, Thomas C. Shirley, Charles E. O’Clair, S. James Taggart
1996, Conference Paper, Proceedings of the international symposium on biology, management, and economics of crabs from high latitude habitats: Lowell Wakefield fisheries symposium
The activity and feeding behavior of ovigerous Dungeness crabs, Cancer magister, were examined as part of a long-term study. Part of this study surveyed Bartlett Cove in Glacier Bay, Alaska, during the spring of 1994 where 50 commercial pots were soaked for 24 hours. Catch per unit effort (CPUE), dispersion,...
Migration, fidelity, and use of autumn staging grounds in Alaska by Cackling Canada Geese Branta canadensis minima
Robert E. Gill Jr., Christopher Babcock, Colleen M. Handel, William R. Butler Jr., Dennis G. Raveling
1996, Wildfowl (47) 42-61
Cackling Canada Geese were studied annually (1985-88) on autumn migration staging areas in Alaska during a period of rapid population growth. Geese concentrated at two estuaries (Ugashik Bay and Cinder Lagoon) along the north side of the Alaska Peninsula. Birds arrived on the staging areas in late September, numbers peaked...
Bottom characteristics of an ocean disposal site off Honolulu, Hawaii: time-based navigational trackline data managed by routes and events
Florence L. Wong, Michael R. Hamer, Monty A. Hampton, Michael E. Torresan
1996, Conference Paper, 1996 ESRI user conference: proceedings
No abstract available...
No rocks, no water, no ecosystem: geoscience contributes to the understanding of water-quality programs in the Florida Keys
Eugene A. Shinn
1996, Geotimes (41) 16-19
No abstract available....
Digital maps of the extent, base, top, and potentiometric surface of the Ozark aquifer in Kansas
K. E. Juracek, C. V. Hansen
1996, Open-File Report 96-119
Seasonal bathymetric distributions of 16 fishes in Lake Superior, 1958-75
James H. Selgeby, Michael H. Hoff
1996, Biological Science Report 7
The bathymetric distributions of fishes in Lake Superior, which is one of the largest and deepest lakes in the world, has not been studied on a lakewide scale. Knowledge about the bathymetric distributions will aid in designing fish sampling programs, estimating absolute abundances, and modeling energy flow in the...
Survival of radiomarked canvasback ducklings in northwestern Minnesota
Carl E. Korschgen, Kevin P. Kenow, William L. Green, Douglas H. Johnson, Michael D. Samuel, Louis Sileo
1996, Journal of Wildlife Management (60) 120-132
Duckling survival, an important factor affecting annual recruitment, has not been determined adequately for canvasbacks (Aythya valisineria). We investigated the magnitude, timing, and causes of mortality of canvasback ducklings from hatch to fledging at the Agassiz National Wildlife Refuge (NWR) in northwestern Minnesota during 1987-90. During the 4 years, 217...
Management of northern prairies and wetlands for the conservation of neotropical migratory birds
Douglas H. Johnson
1996, General Technical Report NC-187
Grasslands and wetlands of the northern prairies provide important breeding habitat for a number of birds. Deciding which species deserve most attention in managing those habitats depends, in part, on the importance of the area to the species. Many species in northern prairies are more common elsewhere and need no...
