Studies of angiospermous woods in Australian brown coal by nuclear magnetic resonance and analytical pyrolysis: new insight into early coalification
Patrick G. Hatcher, M. A. Wilson, M. Vassalo, H. E. Lerch III
1990, International Journal of Coal Geology (16) 205-207
Many Tertiary coals contain abundant fossilized remains of angiosperms, which commonly dominated the ancient peat-swamp environments; modern analogs of such swamps can be found in tropical and subtropical regions of the world. Comparisons of angiospermous wood from Australian brown coal with...
Radium distribution and indoor radon in the Pacific Northwest
J. S. Duval, J. K. Otton
1990, Geophysical Research Letters (17) 801-804
Aerial gamma-ray data were compiled to produce a map showing the distribution of radium (226Ra) in near-surface materials in the Pacific Northwest (Washington, Oregon, and Idaho, and parts of Montana, Wyoming, California, Nevada, and Utah). A comparison of measurements of indoor concentration levels of radon (222Rn)...
The magnetospheric disturbance ring current as a source for probing the deep earth electrical conductivity
W.H. Campbell
1990, Pure and Applied Geophysics PAGEOPH (134) 541-557
Two current rings have been observed in the equatorial plane of the earth at times of high geomagnetic activity. An eastward current exists between about 2 and 3.5 earth radii (Re) distant, and a larger, more variable companion current exists between about 4 and 9 Re. These current regions are...
Monitoring the hydrologic system for potential effects of geothermal and ground-water development in the Long Valley caldera, Mono County, California, U.S.A
Christopher Farrar, Daniel Lyster
1990, Conference Paper, Transactions - Geothermal Resources Council
In the early 1980's, renewed interest in the geothermal potential of the Long Valley caldera, California, highlighted the need to balance the benefits of energy development with the established recreational activities of the area. The Long Valley Hydrologic Advisory Committee, formed in 1987, instituted a monitoring program to collect data...
Occurrence and geochemistry of natural gases, Piceance Basin, northwest Colorado
Ronald C. Johnson, Dudley D. Rice
1990, American Association of Petroleum Geologists Bulletin (74) 805-829
The Piceance basin is a hydrocarbon-rich province that has natural gas production from reservoirs ranging in age from Late Jurassic to Eocene and large undeveloped resources of natural gas in coal beds and tight sandstone reservoirs of Cretaceous age. Gases from all producing intervals are of predominantly thermal origin and...
Preliminary assessment of shoreline changes caused by Hurricane Hugo: Sullivan's Island and Isle of Palms, South Carolina
J. W. Haines, A. H. Sallenger Jr.
1990, South Carolina Geology (33) 1-10
No abstract available ...
Geology of the Blue Mountains region of Oregon, Idaho, and Washington: Cenozoic geology of the Blue Mountains region
G.W. Walker, editor(s)
1990, Professional Paper 1437
No abstract available....
Interpreting the scene
Fred P. Meyer, Roger L. Herman
Fred P. Meyer, Lee A. Barclay, editor(s)
1990, Resource Publication 177-3
No abstract available....
Effects of tillage practices and carbofuran exposure on small mammals
Peter H. Albers, Greg L. Linder, James D. Nichols
1990, Journal of Wildlife Management (54) 135-142
We compared population estimates, body mass, movement, and blood chemistry of small mammals between conventionally tilled and no-till cornfields in Maryland and Pennsylvania to evaluate the effects of tillage practices and carbofuran exposure on small mammals. Estimates suggest that populations of white-footed mice (Peromyscus leucopus) were not significantly related (P...
Observations on the effects of irrigation water containing 3-trifluoromethyl-4-nitrophenol (TFM) on plants
P.A. Gilderhus
1990, Investigations in Fish Control 100
Abstract not submitted to date...
Density-dependence at sea for coho salmon (Oncorhynchus kisutch)
J.M. Emlen, R.R. Reisenbichler, A.M. McGie, T.E. Nickelson
1990, Canadian Journal of Fisheries and Aquatic Sciences (47) 1765-1772
The success of expanded salmon hatchery programs will depend strongly on the degree of density-induced diminishing returns per smolt released. Several authors have addressed the question of density-dependent mortality at sea in coho salmon (Oncorhynchus kisutch), but have come to conflicting conclusions. We believe there are compelling reasons to reinvestigate...
Feeding ecology of subyearling Chinook salmon in riverine and reservoir habitats of the Columbia River
Dennis W. Rondorf, Gerard A. Gray, Robert B. Fairley
1990, Transactions of the American Fisheries Society (119) 16-24
In the Columbia River, we found the diet of subyearling chinook salmon Oncorhynchus tshawytscha to be predominately caddisflies (Trichoptera; 64% by weight) in riverine nursery habitats, but mostly Daphnia spp. and terrestrial insects in reservoir habitats. A preference analysis indicated that subyearlings did not eat food items in proportion to...
Use of a fish health condition profile in assessing the health and condition of juvenile Chinook salmon
J.F. Novotny, J.W. Beeman
1990, Progressive Fish-Culturist (52) 162-170
The fish health condition profile, a simplified system for assessing fish health and condition, was originally developed for fish hatcheries and feral trout populations in Utah. We evaluated the method during routine health assessments of juvenile fall chinook salmon (Oncorhynchus tshawytscha) reared in net pens in the Columbia River in...
Spatial and temporal variation in proportional stock density and relative weight of smallmouth bass in a reservoir
Matthew G. Mesa, S.D. Duke, David L. Ward
1990, Journal of Freshwater Ecology (5) 323-339
Population data for smallmouth bass Micropterus dolomieui in 20,235 ha John Day Reservoir on the Columbia River were used to (1) determine whether Proportional Stock Density (PSD) and Relative Weight (Wr) varied spatially and temporally in two areas of the reservoir with established smallmouth bass fisheries; (2) explore possible...
Status and habitat requirements of white sturgeon populations in the Columbia River downstream from McNary Dam
S.D. Duke, T.J. Underwood, G.M. Asbridge, R.G. Griswold, M.J. Parsley, L.G. Beckman
1990, Report, Status and habitat requirements of white sturgeon populations in the Columbia River downstream from McNary Dam
No abstract available...
Use of an artificial substrate to collect white sturgeon eggs
G.T. McCabe, L.G. Beckman
1990, California Fish and Game (76) 248-250
No abstract available ...
Management implications of a model of predation by a resident fish on juvenile salmonids migrating through a Columbia River reservoir
Raymond C. Beamesderfer, Bruce E. Rieman, Lewis J. Bledsoe, Steven Vigg
1990, North American Journal of Fisheries Management (10) 290-304
We constructed a model ofpredation by northern squawfish Ptychocheilus oregonensis on juvenile salmonids migrating through John Day Reservoir. The model predicts salmonid survival as a function of number and distribution of northern squawfish, number and timing of juvenile salmonids entering the reservoir, salmonid residence time, water temperature, and flow. The...
Residual currents and long-term transport
R. T. Cheng
1990, Book
Estuaries, bays, and contiguous coastal seas of the world are the most valuable and yet most vulnerable marine ecosystems. For centuries, society has placed enormous value on coastal areas for living, working, and recreation. In nearly all regions of the world, the largest population is distributed along the coastlines. The...
A study of model bivalve siphonal currents
Stephen G. Monismith, Jeffrey R. Koseff, Janet K. Thompson, Catherine A. O’Riordan, Heidi M. Nepf
1990, Limnology and Oceanography (35) 680-696
We carried out experiments studying the hydrodynamics of bivalve siphonal currents in a laboratory flume. Rather than use living animals, we devised a simple, model siphon pair connected to a pump. Fluorescence-based flow visualization was used to characterize siphon-jet flows for several geometric configurations and flow speeds. These measurements show...
Remarkable invasion of San Francisco Bay (California, USA) by the Asian clam Potamocorbula amurensis. II. Displacement of a former community
Frederic H. Nichols, Janet K. Thompson, Laurence E. Schemel
1990, Marine Ecology Progress Series (66) 95-101
Long-term macrobenthic sampling at a site in northern San Francisco Bay has provided an unusual opportunity for documenting the time course of an invasion by a recently introduced Asian clam Potamocorbula arnurensis. Between 1977, when sampling began, and 1986, when the new clam was first discovered, the benthic community varied...
Contaminant residues in the bloater (Coregonus hoyi) of Lake Michigan, 1969-1986
Robert J. Hesselberg, James P. Hickey, David A. Nortrup, Wayne A. Willford
1990, Journal of Great Lakes Research (16) 121-129
Residues of DDT, PCBs, and dieldrin in Lake Michigan bloaters (Coregonus hoyi) decreased between 1969 and 1986. All values for contaminant residues were measured and reported as μg/g of whole fish, wet weight; the error limits represented the 95% confidence interval half widths. Total DDT content declined 87%, from 9.9...
Recovery of an offshore lake trout (Salvelinus namaycush) population in eastern Lake Superior
Gary L. Curtis
1990, Journal of Great Lakes Research (16) 279-287
The lake trout (Salvelinus namaycush) population at Stannard Rock, Michigan, an isolated offshore reef in eastern Lake Superior, was monitored each spring from 1959–79 using a permit assessment gill net fishery. This population, like nearly all of those in inshore waters, declined to low levels during the years of intense...
Effects of neck bands on the behavior of wintering greater white-fronted geese
Craig R. Ely
1990, Journal of Field Ornithology (61) 249-253
Activity budgets of adult Greater White-fronted Geese (Anser albifrons frontalis) with and without neck bands during the non-breeding season revealed that geese with neck bands spent more time preening than geese without neck bands while at foraging sites, but not while at roosting sites. Neck-banded and control geese spent equal...
Incubation rhythm in the Fulmar Fulmarus glacialis: Annual variation and sex roles
Scott A. Hatch
1990, Ibis (132) 515-524
I monitored the incubation schedules of Fulmars Fulmarus glacialis in an Alaskan colony by observing nests where the male and female were of different colour phases. Complete shifts of up to 16 days were recorded; the average shift in mid-incubation was 4–6 days. Mean shift length was inversely correlated with...
The geology of selected peat-forming environments in temperate and tropical latitudes
C. C. Cameron, C.A. Palmer, J.S. Esterle
1990, International Journal of Coal Geology (16) 127-130
We studied peat in several geologic and climatic settings: (1) a glaciated terrain in cold-temperate Maine and Minnesota, U.S.A.; (2) an island in a temperate maritime climate in the Atlantic Ocean off the coast of Maine, U.S.A., where sea level is...
