Apparatus for precise regulation and chilling of water temperatures in laboratory studies
D.B. Wangaard, John P. McDonell, Carl V. Burger, R.L. Wilmot
1991, Progressive Fish-Culturist (53) 251-255
Laboratory simulation of water temperature regimes that occur in subarctic rivers through winter necessitates the ability to maintain near‐freezing conditions. A heat‐exchanging apparatus is described that provided a convenient means of simulating the range of temperatures (0.5–12°C) that incubating eggs of salmon (Oncorhynchus spp.) typically experience in south‐central Alaskan watersheds. The...
Effects of orally administered steroids on lake trout and Atlantic salmon
R. L. Herman, H. L. Kincaid
1991, Progressive Fish-Culturist (53) 157-161
Lake trout (Salvelinus namaycush) and Atlantic salmon (Salmo salar) fed 30 mg β‐estradiol/kg of feed for 100 d from first feeding had liver and kidney pathology similar to but much less severe than that previously reported for rainbow trout (Oncorhynchus mykiss). Mortality was not affected. Both lake trout and Atlantic...
Large-scale distribution of metal contamination in the fine-grained sediments of the Clark Fork River, Montana, U.S.A.
E.V. Axtmann, S. N. Luoma
1991, Applied Geochemistry (6) 75-88
Historic discharges from the mining and smelting complex at the head-waters of the Clark Fork River have resulted in elevated Ag, Cd, Cu, Pb and Zn concentrations in the <60 μm fraction of both bed and flood-plain sediments of the river. Processes affecting the trends in longitudinal distributions of these...
An aem-tem study of weathering and diagenesis, Abert Lake, Oregon: I. Weathering reactions in the volcanics
J.F. Banfield, B.F. Jones, D.R. Veblen
1991, Geochimica et Cosmochimica Acta (55) 2781-2793
Abert Lake in south-central Oregon provides a site suitable for the study of sequential weathering and diagenetic events. In this first of two papers, transmission electron microscopy was used to characterize the igneous mineralogy, subsolidus alteration assemblage, and the structural and chemical aspects of silicate weathering reactions that occur in...
Effects of wind-hardened snow on foraging by reindeer (Rangifer tarandus)
W. B. Collins, T. S. Smith
1991, Arctic (44) 217-222
Various methods were investigated for assessing the relationship between wind-hardened snow (upsik) and forage availability to reindeer. Mean bottom area of individual craters was not a function of depth, hardness or integrated hardness. Individual crater area was partially dependent on specific cratering time (r2 = .60). Cratering time per active...
Inter- and intraspecific mitochondrial DNA variation in North American bears (Ursus)
Matthew A. Cronin, Steven C. Amstrup, Gerald W. Garner, Ernest R. Vyse
1991, Canadian Journal of Zoology (69) 2985-2992
We assessed mitochondrial DNA variation in North American black bears (Ursus americanus), brown bears (Ursus arctos), and polar bears (Ursus maritimus). Divergent mitochondrial DNA haplotypes (0.05 base substitutions per nucleotide) were identified in populations of black bears from Montana and Oregon. In contrast, very similar haplotypes occur in black bears...
Integration of remote sensing and GIS: Data and data access
M. Ehlers, D. D. Greenlee, T. Smith, J. Star
1991, Photogrammetric Engineering and Remote Sensing (57) 669-675
CT: Theintegration of remote sensing tools and technology with the spatial analysis orientation of geographic information systems is a complex task. In this paper, we focus on the issues of making data available and useful to the user. In part, this involves a set of problems which reflect on the...
Compsopogon cf. coeruleus, a benthic red alga (Rhodophyta) new to the Laurentian Great Lakes
Bruce A. Manny, Thomas A. Edsall, Daniel E. Wujek
1991, Canadian Journal of Botany (69) 1237-1240
We found Compsopogon cf. coeruleus for the first time in the Laurentian Great Lakes, growing on limestone rocks at a depth of 21 m on Six Fathom Bank in central Lake Huron. It is the first freshwater red alga to be found in the Great Lakes and the only red alga ever found on an...
Consumption, growth, and allometry - a comment
S.W. Hewett, C.E. Kraft, Barry L. Johnson
1991, Canadian Journal of Fisheries and Aquatic Sciences (48) 1334-1337
Abstract has not been submitted...
An overview of the U.S. Fish and Wildlife Service mitigation research program
R.K. Schreiber, R.F. Villella
H. Olem, R.K. Schreiber, R.W. Brocksen, D.B. Porcella, editor(s)
1991, Book chapter, International Lake and Watershed Liming Practices
No abstract available at this time...
Digestibility and energy values of intact, disrupted and extracts from brewer's dried yeast fed to rainbow trout (Oncorhynchus mykiss)
G. L. Rumsey, S. G. Hughes, R. R. Smith, J.E. Kinsella, K. J. Shetty
1991, Animal Feed Science and Technology (33) 185-193
Although fish meal has historically been used as the primary source of protein in fish feeds, brewer's dried yeast (BDY) is presently being investigated as a primary replacement for fish meal. As little is known about the ability of fish to utilize BDY, studies were conducted to study bioavailability of...
Seasonal patterns of prey availability and the foraging behavior of arctic foxes (Alopex lagopus) in a waterfowl nesting area
Alice Stickney
1991, Canadian Journal of Zoology (69) 2853-2859
The foraging behavior of arctic foxes was observed in a waterfowl nesting area on the Yukon–Kuskokwim Delta of Alaska in 1985–1986. Observations were made during peak fox activity from two towers, 3 m high, located in different community types. Data were collected continuously for individual foxes on specific activities, the community...
Comment: mathematical properties of condition indices
S. Gutreuter
1991, Transactions of the American Fisheries Society (119) 1049-1051
Abstract has not been submitted...
Infestation of unionids by Dreissena polymorpha in a power plant canal in Lake Erie
Don W. Schloesser, William P. Kovalak
1991, Journal of Shellfish Research (10) 355-359
Abstract has not been submitted...
Characteristics of black tern (Chlidonias niger) nesting habitat at Lakeview Wildlife Management Area, New York
M. G. Knutson
1991, Kingbird (41) 228-235
Abstract has not been submitted...
Growth rate is negatively correlated with hatch date in Black Brant
James S. Sedinger, Paul L. Flint
1991, Ecology (72) 496-502
Arctic geese nest in a highly seasonal environment in which ungrazed plants reach peak nitrogen concentrations when goslings hatch (Sedinger and Raveling 1986). Grazing by geese prolongs peak nutrient concentrations but reduces food availability. This should cause nutrient availability to decline seasonally. Here, we test the hypothesis that late-hatching goslings...
Disturbance effects on aquatic vegetation in regulated and unregulated lakes in northern Minnesota
Douglas A. Wilcox, James E. Meeker
1991, Canadian Journal of Botany (69) 1542-1551
The effects of water-level regulation on aquatic macrophyte communities were investigated by comparing two regulated lakes in northern Minnesota with a nearby unregulated lake (Lac La Croix). Natural annual fluctuations of about 1.8 m were replaced with fluctuations of 1.1 m and 2.7 m in the regulated lakes, and the...
Derivation of safety factors for setting harvest quotas on adult walleyes from past estimates of abundance
Michael J. Hansen, Michael D. Staggs, Michael H. Hoff
1991, Transactions of the American Fisheries Society (120) 620-628
Past population estimates of adult walleyes Stizostedion vitreum can be used to set harvest quotas, provided that temporal variability in abundance of adult walleyes is accounted for. We used a long-term data set from Escanaba Lake, Wisconsin, to evaluate the accuracy of past population estimates for setting current-year quotas for adult walleyes....
The transition from hydrostatic to greater than hydrostatic fluid pressure in presently active continental hydrothermal systems in crystalline rock
R.O. Fournier
1991, Geophysical Research Letters (18) 955-958
Fluid flow at hydrostatic pressure (Ph) is relatively common through fractures in silicic and in mafic crystalline rocks where temperatures are less than about 350–370°C. In contrast, pore-fluid pressure (Pf) > Ph has been encountered at the bottom of 3 geothermal exploration wells that attained temperatures >370°C...
Comparison of three different methods to merge multiresolution and multispectral data: Landsat TM and SPOT panchromatic
P.S. Chavez Jr., S.C. Sides, J.A. Anderson
1991, Photogrammetric Engineering and Remote Sensing (57) 295-303
The merging of multisensor image data is becoming a widely used procedure because of the complementary nature of various data sets. Ideally, the method used to merge data sets with high-spatial and high-spectral resolution should not distort the spectral characteristics of the high-spectral resolution data. This paper compares the results...
Conditions leading to a recent small hydrothermal explosion at Yellowstone National Park
R.O. Fournier, J. M. Thompson, C. G. Cunningham, R. A. Hutchinson
1991, Geological Society of America Bulletin (103) 1114-1120
Porkchop Geyser, in Yellowstone National Park, was the site of a small hydrothermal explosion on September 5, 1989. In the early 1960s, this was a quiescent spring with an intermittent seeping discharge. Infrequent geyser eruptions 3-5 m high started in 1971, and in 1985 the geyser began erupting as a...
Terraces on the Florida escarpment: Implications for erosional processes
D.C. Twichell, C. K. Paull, L.M. Parson
1991, Geology (19) 897-900
SeaBeam bathymetric data and GLORIA (Geologic LOng-Range Inclined Asdic) sidescan sonar images of a 175-km-long section of the Florida escarpment in the eastern Guff of Mexico show that this carbonate escarpment has been eroded since its initial formation, but its morphology suggests that erosional processes have not acted uniformly on...
Applications of hydrologic information automatically extracted from digital elevation models
Susan K. Jenson
1991, Hydrological Processes (5) 31-44
Digital elevation models (DEMs) can be used to derive a wealth of information about the morphology of a land surface. Traditional raster analysis methods can be used to derive slope, aspect, and shaded relief information; recently-developed computer programs can be used to delineate depressions, overland flow paths, and watershed boundaries....
Late Laramide thrust-related and evaporite-domed anticlines in the southern Piceance Basin, northeastern Colorado Plateau
M. A. Grout, G. A. Abrams, R. L. Tang, T. J. Hainsworth, E.R. Verbeek
1991, American Association of Petroleum Geologists Bulletin (75) 205-218
New seismic and gravity data across the hydrocarbon-producing Divide Creek and Wolf Creek anticlines in the southern Piceance basin reveal contrasting styles of deformation within two widely separated time frames. Seismic data indicate that prebasin Paleozoic deformation resulted in block faulting of the Precambrian crystalline basement rocks and overlying Cambrian...
Seismic response of transamerical building. I. Data and preliminary analysis
M. Çelebi, E. Safak
1991, Journal of Structural Engineering (117) 2389-2404
The objective of this paper is to present preliminary analyses of a set of acceleration response records obtained during the October 17, 1989 Loma Prieta earthquake (Ms = 7.1) from the 60-story vertically tapered, pyramid-shaped Trans-america Building-a landmark of San Francisco. The building was instrumented in 1985 with 22 channels...
