Hydrologic control of litter decomposition in seasonally flooded prairie marshes
Hilary A. Neckles, Christopher Neill
1994, Hydrobiologia (286) 155-165
The effect of seasonal inundation on the decomposition of emergent macrophyte litter (Scolochloa festucacea) was examined under experimental flooding regimes in a northern prairie marsh. Stem and leaf litter was subjected to six aboveground inundation treatments (ranging from never flooded to flooded April through October) and two belowground...
Team investigates activity at Mt. Semeru, Java, volcano
Peggy Hellweg, Deiter Seidl, Kirbani Sri Brotopuspito, Wolfgang Brustle
1994, Eos, American Geophysical Union (75) 313-317
In February 1994 a large eruption continued a pattern of activity that Mt. Semeru volcano—the highest mountain in Java, Indonesia—has exhibited since 1967. Mt. Semeru lies south of the Tengger Caldera, which encloses the volcano Mt. Bromo. Together, they form one of the largest volcanic complexes in the province of...
The seismic velocity structure of the Newfoundland Appalachian orogen
Stephen Hughes, Jeremy Hall, James H. Luetgert
1994, Journal of Geophysical Research B: Solid Earth (99) 13633-13653
The deep structure of the Newfoundland Appalachian orogen is investigated by analyses of three intersecting seismic refraction/wide-angle reflection profiles which traverse the Gander and Dunnage zones or central mobile belt of Newfoundland. A simultaneous travel time inversion for velocity and interface was applied to the in-line seismic refraction/wide-angle reflection data...
Bottom-sediment chemistry in Devil's Lake, northeast North Dakota
S.C. Komor
1994, SEPM Special Publication 21-32
Devils Lake is a 200 km2 terminal lake that contains sodium sulfate type water. Dissolved solids concentrations range from about 3,500 mg/L to 10,000 mg/L depending on location To investigate geochemical processes in the bottom sediments of Devils Lake, sediment cores were collected at two sites in the western half...
Climatic influences on the growth of subalpine trees in the Colorado Front Range
Ricardo Villalba, Thomas T. Veblen, John Ogden
1994, Ecology (75) 1450-1462
We examined variations in tree growth responses to climatic variations among different tree species and habitat types in the subalpine zone of the Colorado Front Range. We constructed 25 tree ring site chronologies (11 of Picea engelmannii, 9 of Abies lasiocarpa, 4 of Pinus contorta var. latifolia, and 1 of...
An alternative index of satellite telemetry location error
Kim A. Keating
1994, Journal of Wildlife Management (58) 414-421
Existing indices of satellite telemetry error offer objective standards for censoring poor locations, but have drawbacks. Examining distances and relative directions between consecutive satellite telemetry locations, I developed an alternative error index, ξ, and compared its performance with that of the location quality index, NQ (Serv. Argos 1988). In controlled...
Ecological economics
Richard L. Johnson
1994, Ecology (75) 1516-1517
No abstract available....
SUBCON: scientific drilling and crustal recycling
David W. Scholl, Terry Plank, Julie Morris
1994, JOI/USSAC Newsletter (7) 8-9
Establishment, sex structure and breeding system of an exotic riparian willow, Salix X rubens
Patrick B. Shafroth, Michael L. Scott, Jonathan M. Friedman, Richard D. Laven
1994, American Midland Naturalist (132) 159-172
Several Eurasian tree willows (Salix spp.) have become naturalized in riparian areas outside of their native range. Salix x rubens is a Eurasian willow that is conspicuous along streams in the high plains of Colorado. We examined establishment of seedlings and cuttings, the sex structure and the breeding system of...
GPS measured rates of deformation in the northern San Francisco Bay Region, California, 1990–1993
S. D. P. Williams, Jerry L. Svarc, Michael Lisowski, W.H. Prescott
1994, Geophysical Research Letters (21) 1511-1514
A 100-km-long, 13-station profile extending across the San Andreas fault system north of San Francisco Bay was measured 7 times between March 1990 and January 1993 with the Global Positioning System (GPS). The data have been processed using the Bernese Version 3.2 software. Data from a continental-scale fiducial network were...
Speocarcinus berglundi n. sp. (Decapoda: Brachyura), a new crab from the Imperial Formation (late Miocene-late Pliocene) of southern California
Annette B. Tucker, R.M. Feldmann, Charles L. Powell II
1994, Journal of Paleontology (68) 800-807
Speocarcinus berglundi n. sp. is described from the Imperial Formation in Riverside County, California. Although the Imperial Formation spans late Miocene through late Pliocene time, the part of the unit that bears crabs has been radiometrically dated as late Miocene. The identification of a new species was based upon comparison...
Community‐level field method for testing the toxicity of contaminated sediments in estuaries
Mary C. Watzin, Pasquale F. Roscigno, W. David Burke
1994, Environmental Toxicology and Chemistry (13) 1187-1193
The objective of this study was to demonstrate a method for testing the toxicity of contaminated sediments under field conditions. An artificial sediment that matches field sediment in grain‐size distribution and organic matter content was mixed from 11 components and used as the test substrate. Clean sediments and sediments spiked...
Diagenesis of diatomite from the Kolubara Coal Basin, Baroševac, Serbia
J. Obradovic, James R. Hein, J. Djurdjevic
1994, Geological Journal (29) 209-217
Diatomite associated with the Kolubara Coal Basin was studied to better understand early stage silica diagenesis of shallow water deposits. The Kolubara Basin consists of Neogene siliciclastic rocks, diatomite, marlstone and rare carbonates. Palaeozoic metamorphic and Mesozoic sedimentary and igneous basement rocks are transgressively overlain by Upper Miocene sandstone, siltstone,...
Undernutrition and serum and urinary urea nitrogen of white-tailed deer during winter
Glenn D. DelGiudice, L. David Mech, Ulysses S. Seal
1994, Journal of Wildlife Management (58) 430-436
Direct, practical means of assessing undernutrition in deer (Odocoileus spp.) and other ungulates during winter are needed in areas of research and management. We examined the relationship between mass loss and serum urea nitrogen (SUN) and urinary urea nitrogen:creatinine (U:C) in captive white-tailed deer (O. virginianus). During 4 February-5 May...
Requirement of rainbow trout for dietary phosphorus and its relationship to the amount discharged hatchery effluents
H. G. Ketola, M. E. Richmond
1994, Transactions of the American Fisheries Society (123) 587-594
Fingerling rainbow trout Oncorhynchus mykiss with initial mean weights of 9 g (small fish) and 35 g (large fish) were fed diets adequate in all known nutrients except phosphorus (P). In two experiments, triplicate lots of rainbow trout were fed basal diets containing either 0.14 or 0.41% non‐phytin P,...
Waterbird use of saltmarsh ponds created for open marsh water management
R. Michael Erwin, Jeff S. Hatfield, Marshall Howe, Susan Klugman
1994, Journal of Wildlife Management (58) 516-524
Open Marsh Water Management (OMWM) as an alternative to pesticides for mosquito control in saltmarshes along the Atlantic Coast has created debate among biologists. We designed an experiment to determine waterbird (American black duck [Anas rubripe]) and other waterfowl, wading birds, shorebirds, gulls, and terns) use (during daylight) of ponds...
Mourning dove population trend estimates from Call-Count and North American Breeding Bird Surveys
John R. Sauer, David D. Dolton, Sam Droege
1994, Journal of Wildlife Management (58) 506-515
The mourning dove (Zenaida macroura) Call-count Survey and the North American Breeding Bird Survey provide information on population trends of mourning doves throughout the continental United States. Because surveys are an integral part of the development of hunting regulations, a need exists to determine which survey provides precise information. We...
Marginal bed load transport in a gravel bed stream, Sagehen Creek, California
E.D. Andrews
1994, Water Resources Research (30) 2241-2250
Marginal bed load transport describes the condition when relatively few bed particles are moving at any time. Bed particles resting in the shallowest bed pockets will move when the dimensionless shear stress т* exceeds a value of about 0.020. As т* increases, the number of bed particles moving increases. Significant motion of...
Climate, soil water storage, and the average annual water balance
P. C. D. Milly
1994, Water Resources Research (30) 2143-2156
This paper describes the development and testing of the hypothesis that the long-term water balance is determined only by the local interaction of fluctuating water supply (precipitation) and demand (potential evapotranspiration), mediated by water storage in the soil. Adoption of this hypothesis, together with idealized representations of relevant input variabilities...
Tundra swan habitat preferences during migration in North Dakota
Susan L. Earnst
1994, Journal of Wildlife Management (58) 546-551
I studied tundra swan (Cygnus columbianus columbianus) habitat preference in North Dakota during autumn migration, 1988-89. Many thousand tundra swans stop in the Prairie Pothole region during autumn migration, but swan resource use has not been quantified. I examined habitat preference in relation to an index of sago pondweed (Potamogeton...
Geochemical interactions between constituents in acidic groundwater and alluvium in an aquifer near Globe, Arizona
Kenneth G. Stollenwerk
1994, Applied Geochemistry (9) 353-369
Acidic water from a copper-mining area has contaminated an alluvial aquifer and stream near Globe, Arizona. The most contaminated groundwater has a pH of 3.3, and contains about 100 mmol/1 SO4, 50 mmol/1 Fe, 11 mmol/1 Al and 3 mmol/1 Cu. Reactions between alluvium and acidic groundwater were first evaluated...
Methanolobus taylorii sp nov, a new methylotropic, estuarine methanogen
Ronald S. Oremland, David R. Boone
1994, International Journal of Systematic Bacteriology (44) 573-575
Previously published phylogenetic studies of 16S rRNA showed that methylotrophic, slightly halophilic, methanogenic strain GS-16T (T = type strain) represents a new species of bacterium. We propose the name Methanolobus taylorii for this species; strain GS-16 is the type strain....
Correlation of basinal carbonate cycles to nearshore parasequences in the Late Cretaceous Greenhorn seaway, Western Interior U.S.A.
William P. Elder, Edmund R. Gustason, Bradley B. Sageman
1994, Geological Society of America Bulletin (106) 892-902
Upper Cretaceous limestone-shale couplets developed within the late transgressive stage of the Greenhorn cyclothem may be correlated from carbonate-dominated (basinal) sequences in central Kansas and Colorado westward to clastic cycles in southern Utah. Six such basinal couplets have been traced to corresponding upward-coarsening progradational cycles developed on the western...
Timing of remigial molt in fulvous whistling ducks nesting in Louisiana
William L. Hohman, David M. Richard
1994, Southwestern Naturalist (39) 190-192
No abstract available....
Distribution and status of submerged vegetation in estuaries of the upper Texas coast
S.E. Adair, J.L. Moore, Christopher P. Onuf
1994, Wetlands (14) 110-121
Composition and biomass of beds of submerged aquatic vegetation (SAV) in estuaries along the upper Texas coast were examined from bottom core and rake samples taken along 72 line transects during July–August 1987. Substrate composition, salinity, water depth, and water clarity were also measured at each sample station. Halodule...
