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...
Growth and equilibrium in sea otter populations
J. A. Estes
1990, Journal of Animal Ecology (59) 385-400
(1) Counts through time were compiled for five sea otter (Enhydra lutris) populations in the north-east Pacific Ocean that were below equilibrium density: Attu Island, south-east Alaska, British Columbia, Washington State, and central California. Similar data were obtained from the equilibrium density population at Amchitka Island in 1971 and 1986....
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...
Components of breeding productivity in a marine bird community: key factors and concordance
Scott A. Hatch, Martha A. Hatch
1990, Canadian Journal of Zoology (68) 1680-1690
We estimated components of annual breeding productivity for eight species of marine birds on the Semidi Islands in the western Gulf of Alaska. Mortality of eggs and young, caused primarily by avian predators, accounted for most of the annual variation in productivity. Failure to produce eggs, clutch size variation, and...
Breeding seasons of oceanic birds in a subarctic colony
Scott A. Hatch, Martha A. Hatch
1990, Canadian Journal of Zoology (68) 1664-1679
We studied the breeding seasons of marine birds on the Semidi Islands, western Gulf of Alaska, from 1976 to 1983. Distributions of laying or hatching observed in 11 species during 1–7 years are presented; less detailed information is available on the breeding schedules of three species. The combined laying period...
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...
Where to send samples for analysis
R. A. Schnick
Fred P. Meyer, Lee A. Barclay, editor(s)
1990, Resource Publication 177-8
No abstract available....
Sedimentary evolution of the Pliocene and Pleistocene Ebro margin, northeastern Spain
B. Alonso, M.E. Field, J.V. Gardner, A. Maldonado
1990, Marine Geology (95) 313-331
The Pliocene and Pleistocene deposits of the Spanish Ebro margin overlie a regional unconformity and contain a major disconformity. These unconformities, named Reflector M and Reflector G, mark the bases of two seismic sequences. Except for close to the upper boundary...
Fusarium spp. recovered from waste peanuts associated with sandhill crane mortality
P.E. Nelson, R.J. Cole, T.A. Tousson, J.W. Dorner, R. M. Windingstad
1990, Mycologia (82) 562-565
Approximately 5000 sandhill cranes (Grus canadensis ) died from undetermined causes in Gains County, Texas, 1985, and an additional 200 died in 1986. Prominent clinical signs were the inability of many sick cranes to hold their necks horizontal and the neck, head, and legs sometimes drooped perpendicularly during flight. Approximately...
Seismic-wave attenuation associated with crustal faults in the New Madrid seismic zone
R. M. Hamilton, Walter D. Mooney
1990, Science (248) 351-354
The attenuation of upper crustal seismic waves that are refracted with a velocity of about 6 kilometers per second varies greatly among profiles in the area of the New Madrid seismic zone in the central Mississippi Valley. The waves that have the strongest attenuation pass through the seismic trend along...
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 ...
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...
Quaternary extrusion rates of the Cascade Range, northwestern United States and southern British Columbia
D. R. Sherrod, James G. Smith
1990, Journal of Geophysical Research Solid Earth (95) 19465-19474
Quaternary (2–0 Ma) extrusion rates change significantly along the Cascade Range volcanic arc. The extrusion rate north of Mount Rainier is about 0.21 km3 km−1 m.y.−1; the rate in southern Washington and northern Oregon south to Mount Hood is about 1.6 km3 km−1 m.y.−1; in central Oregon the rate is 3–6 km3 km−1 m.y.−1; and 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...
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...
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...
Ground-water levels, flow, and specific conductance in unconsolidated aquifers near Lake Erie, Cleveland to Conneaut, Ohio, September 1984
A. W. Coen III
1990, Water-Resources Investigations Report 89-4202
This report described ground-water levels, flow, and specific conductance in aquifer along the southern shore of Lake Erie from Cleveland to Conneaut, Ohio. The data were collected in September 1984 as part of the U.S Geological Survey's Northeast Glacial Buried Valley Regional Aquifer-System Analysis. The study area is about 60...
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 ...
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...
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...
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...
Plant and insect remains from the Wisconsinan interstadial/stadial transition at Wedron, north-central Illinois
C.E. Garry, D.P. Schwert, R. G. Baker, T.J. Kemmis, D. G. Horton, A.E. Sullivan
1990, Quaternary Research (33) 387-399
Organic material exposed within a small swale fill in Pit 6 of the Wedron Silica Sand Co. near Wedron in LaSalle County, Illinois, includes well-preserved pollen, plant macrofossils, and insect remains. This material occurs in slackwater sediment in the lower part of the Peddicord Formation, which was deposited as existing...
Isotopic studies of the Eye-Dashwa Lakes pluton and the long-term integrity of whole-rock and mineral systems
Zell E. Peterman, D.C. Kamineni
1990, Atomic Energy of Canada Limited, AECL (Report)
This report presents results of isotopic studies of the Eye-Dashwa Lakes pluton, located near Atikokan, Ontario. Suites of pristine 'unaltered' and 'highly altered' core samples from deep boreholes were used to study Rb-Sr, U-Th-Pb and Sr-Nd systematics, whole-rock Pb isotopes and fission track dating of apatite. The results have been...
Map of mean annual runoff for the Northeastern, Southeastern, and Mid-Atlantic United States, water years 1951-80
William R. Krug, Warren A. Gebert, David J. Graczyk, Donald L. Stevens Jr., Barry P. Rochelle, M. Robbins Church
1990, Water-Resources Investigations Report 88-4094
A map of mean annual runoff for States within the Northeastern, Southeastern, and Mid-Atlantic United States was prepared by the U.S. Geological Survey for the Direct/Delayed Response Project being conducted by the U.S. Environmental Protection Agency. This map shows mean annual runoff during water years 1951-80. Mean annual runoff from the...
