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Page 4781, results 119501 - 119525

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Effects of contaminants on naiad mollusks (Unionidae): A review
M.E. Havlik, L. L. Marking
1987, Resource Publication 164
Although the uptake, storage, and elimination of contaminants by naiad mollusks has been studied, relatively little information is available on toxicity. Contaminants appear to have destroyed some populations directly by exerting toxic effects, or indirectly by causing or contributing to the elimination of essential food organisms or host fish. The...
Stable isotope dilution analysis of hydrologic samples by inductively coupled plasma mass spectrometry
John R. Garbarino, Howard E. Taylor
1987, Analytical Chemistry (59) 1568-1575
Inductively coupled plasma mass spectrometry is employed in the determination of Ni, Cu, Sr, Cd, Ba, Ti, and Pb in nonsaline, natural water samples by stable isotope dilution analysis. Hydrologic samples were directly analyzed without any unusual pretreatment. Interference effects related to overlapping isobars, formation of metal oxide and multiply...
Age of uranium mineralization at the Jabiluka and Ranger deposits, Northern Territory, Australia: New U-Pb isotope evidence
K.R. Ludwig, R. I. Grauch, C.J. Nutt, J. T. Nash, D. Frishman, K. R. Simmons
1987, Economic Geology (82) 857-874
The Ranger and Jabiluka uranium deposits are the largest in the Alligator Rivers uranium field, which contains at least 20 percent of the world's low-cost uranium reserves. Ore occurs in early Proterozoic metasediments, below an unconformity with sandstones of the 1.65-b.y.-old Kombolgie Formation. This study has used U-Pb isotope data...
Vibriosis in fish
G. L. Bullock
1987, Fish Disease Leaflet 77
Vvibriosis is a systemic bacterial infection of primarily marine and estuarine fishes, caused by bacteria of the genus Vibrio (Ross et al. 1968, Ghittino et al. 1972); it is a major cause of mortality in maricultur operations. It sometimes also occurs in freshwater species.Vibriosis has been known for centuries; outbreaks were recorded as...
Mid-Holocene climate in Northern Minnesota
R. M. Forester, L.D. Delorme, J.P. Bradbury
1987, Quaternary Research (28) 263-273
Study of Holocene ostracodes and diatoms from Elk Lake, in North-Central Minnesota, indicates that the local climate of the mid-Holocene can be subdivided into three intervals. Throughout interval 1 (ca. 7800 to 6700 yr B.P.), climate was colder and much drier than today. During intervals 2 and 3 (ca. 6700...
Environmental pollutant and necropsy data for ospreys from the eastern United States, 1975-1982
Stanley N. Wiemeyer, Shelia K. Schmeling, Allen Anderson
1987, Journal of Wildlife Diseases (23) 279-291
Twenty-three ospreys (Pandion haliaetus) found dead or moribund in the eastern United States during 1975–1982 were necropsied and selected tissues were analyzed for organo-chlorines and metals. Major causes or factors contributing to death were trauma, impact injuries, and emaciation. DDE was detected in 96% of the osprey carcasses, DDD in...
Salt toxicosis in waterfowl in North Dakota
Ronald M. Windingstad, Fred X. Kartch, Richard K. Stroud, Milton R. Smith
1987, Journal of Wildlife Diseases (23) 443-446
About 150 waterfowl died and another 250 became weak and lethargic from suspected salt poisoning after using White Lake, a highly saline lake in Mountrail County, North Dakota. Frigid temperatures made fresh water unavailable, forcing the birds to ingest the saline waters with resultant toxic effects. Sick birds recovered when...
Dynamics of the recovery of the western Lake Erie walleye (Stizostedion vitreum vitreum) stock
Richard W. Hatch, Stephen J. Nepszy, Kenneth M. Muth, Carl T. Baker
1987, Canadian Journal of Fisheries and Aquatic Sciences (44) 15-22
After its 1957 collapse under intensive fishing and environmental stresses, the walleye (Stizostedion vitreum vitreum) stock of western Lake Erie remained low throughout the 1960s. A moratorium on both sport and commercial fishing, resulting from the 1970 discovery of mercury concentrations in walleye flesh, provided an opportunity for the development...
Acute bioassays and hazard evaluation of representative contaminants detected in Great Lakes fish
Dora R. May Passino, Stephen B. Smith
1987, Environmental Toxicology and Chemistry (6) 901-907
We have provided a hazard ranking for 19 classes of compounds representing many of the nearly 500 organic compounds identified by gas chromatography-mass spectrometry in lake trout (Salvelinus namaycush) and walleye (Stizostedion vitreum vitreum) from the Great Lakes and Lake St. Clair. We initially made a provisional hazard ranking based...
Horizontal ichthyoplankton tow-net system with unobstructed net opening
Robert T. Nester
1987, North American Journal of Fisheries Management (7) 148-150
The larval fish sampler described here consists of a modified bridle, frame, and net system with an obstruction-free net opening and is small enough for use on boats 10 m or less in length. The tow net features a square net frame attached to a 0.5-m-diameter cylinder-on-cone plankton net...
Unusual larval habitats and life history of chironomid (Diptera) genera
Patrick L. Hudson
1987, Entomologica Scandinavica Supplements (29) 369-373
Ninety-three genera, representing all subfamilies of Chironomidae, are organized into 9 categories of unusual habitats or life history including hygropetric, riparian (bank, floodplain, upland), hyporheic, symbiotic, and intertidal; others live in water held in plants or mine into unusual substrates. In riparian zones precise location of optimum habitat is difficult...
Management of midges and other invertebrates for waterfowl wintering in California
N.H. Euliss Jr., G. Grodhaus
1987, California Fish and Game (73) 238-243
A review of recent waterfowl food habit studies showed that invertebrates are of major dietary importance to ducks wintering in California. However current wetland practices are directed at production of plant foods and seldom consider the propagation of invertebrates. We suggest that invertebrate repopulation of seasonally flooded marshes will occur...
Solid-state 13C NMR studies of dissolved organic matter in pore waters from different depositional environments
William H. Orem, Patrick G. Hatcher
1987, Organic Geochemistry (11) 73-82
Dissolved organic matter (DOM) in pore waters from sediments of a number of different depositional environments was isolated by ultrafiltration using membranes with a nominal molecular weight cutoff of 500. This > 500 molecular weight DOM represents 70–98% of the total DOM in these pore waters. We determined the gross...