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Page 4847, results 121151 - 121175

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Decline of lake herring (Coregonus artedii) in Lake Superior: an analysis of the Wisconsin herring fishery, 1936-78
James H. Selgeby
1982, Canadian Journal of Fisheries and Aquatic Sciences (39) 554-563
Annual harvests of lake herring (Coregonus artedii) in American waters of Lake Superior declined from an average of 2 million kg in 1936–62 to less than 25 000 kg in 1978. Analysis of commercial fishing records revealed that the sequential overexploitation of discrete unit stocks caused the collapse of the herring population...
Accumulation by fish of contaminants released from dredged sediments
James G. Seelye, Robert J. Hesselberg, Michael J. Mac
1982, Environmental Science & Technology (16) 459-464
Inasmuch as the process of dredging and disposing of dredged materials causes a resuspension of these materials and an increase in bioavailability of associated contaminants, we conducted a series of experiments to examine the potential accumulation by fish of contaminants from suspended sediments. In the first experiment we compared accumulation...
Electric fences to reduce mammalian predation on waterfowl nests
J. T. Lokemoen, Harold A. Doty, D.E. Sharp, J.E. Neaville
1982, Wildlife Society Bulletin (10) 318-323
We evaluated electric fences as predator barriers to reduce high losses of waterfowl nests to mammalian predation at Waterfowl Production Areas (WPAs). The work was done in 1978-81 on 3 paired sites in central North Dakota and western Minnesota. Resident mammalian predators were trapped from inside the exclosures. All 3...
Comparative hatching success of lake trout eggs in Lake Michigan water and well water
Carol C. Edsall, Michael J. Mac
1982, Progressive Fish-Culturist (44) 47-48
A study was undertaken to examine the influence of water from southern Lake Michigan on the survival of lake trout (Salvelinus namaycush) eggs by comparing the hatching success of eggs from the same source incubated in water from Lake Michigan, or from the laboratory well. It is concluded that the...
Nocturnal activity and foraging of prairie raccoons (Procyon lotor) in North Dakota
Raymond J. Greenwood
1982, American Midland Naturalist (107) 238-243
Nocturnal activity and foraging of 39 radio-equipped raccoons (Procyon lotor) in eastern North Dakota were studied from April-July in 1974-1976. Sixteen of the raccoons were collected after foraging bouts for stomach content analysis. Raccoon activity consisted of running (13%), walking (49%) and local movement in confined areas (38%). Local movement...
Food of freshwater drum in western Lake Erie
Michael T. Bur
1982, Journal of Great Lakes Research (8) 672-675
The abundance of freshwater drum (Aplodinotus grunniens) suggests they play an important role in the Lake Erie ecosystem. Our analysis of freshwater drum digestive tracts and macrobenthic samples collected from western Lake Erie indicates that drum were selective feeders. Planktonic cladocerans and larval midges (Chironomidae) were the primary prey organisms...
Variability in nest survival rates and implications to nesting studies
A.T. Klett, Douglas H. Johnson
1982, The Auk (99) 77-87
We used four reasonably large samples (83-213) of Mallard (Anas platyrhynchos) and Blue-winged Teal (A. discors) nests on an interstate highway right-of-way in southcentral North Dakota to evaluate potential biases in hatch-rate estimates. Twelve consecutive, weekly searches for nests were conducted with a cable-chain drag in 1976 and 1977. Nests...
Hydrology of the surficial aquifer in the Floyd River Basin, Iowa
K.D. Wahl, M.J. Meyer, R.A. Karsten
1982, Water Supply Bulletin 12
The Floyd River basin was studied to provide water-resources Information for a typical surficial aquifer in northwest Iowa. Data collection included test drilling, water-level measurements, and chemical analyses of surface and ground water. The Floyd River basin drains 961 square miles of highly dissected to gently rolling topography. Major streams generally...
Modeling of tidal and residual circulation in San Francisco Bay, California
R. T. Cheng
1982, Conference Paper, Proceedings, Seminar on 2-D Flows
Several numerical models have been developed and implemented to simulate tidal and residual circulation in San Francisco Bay. Because of a broad distribution in time scales, hydrodynamic models must be formulated to account for the proper time and spatial scales which dominate the transport processes. A complete current survey of...
Removing tidal-period variations from time-series data using low-pass digital filters
Roy A. Walters, Cynthia Heston
1982, Journal of Physical Oceanography (12) 112-115
Several low-pass, digital filters are examined for their ability to remove tidal Period Variations from a time-series of water surface elevation for San Francisco Bay. The most efficient filter is the one which is applied to the Fourier coefficients of the transformed data, and the filtered data recovered through an...
Earthquake-induced sediment failures on a 0.25o slope, Klamath River delta, California.
M.E. Field, J.V. Gardner, A. E. Jennings, B. D. Edwards
1982, Geology (10) 542-546
On Nov. 8, 1980, a major earthquake (magnitude 6.5-7.2) occurred 60 km off the coast of N California. A survey of the area using high-resolution seismic-reflection and side-scan sonar equipment revealed the presence of extensive sediment failure and flows in a zone about 1 km wide and 20 km long...
Low-frequency variations in sea level and currents in south San Francisco Bay
Roy A. Walters
1982, Journal of Physical Oceanography (12) 658-668
In order to examine physical process in the subtidal time range, sea-level and current meter data for south San Francisco Bay (South Bay) were filtered using a low-pass digital filter to remove tidal period variations. and then subjected to an empirical orthogonal function analysis. For the sea-level data, there is...
Volcanic hazard alert issued for the Long Valley-Mono Lake area of California
R. A. Kerr
1982, Earthquake Information Bulletin (USGS) (14) 84-93
The ski resort of Mammoth Lakes, nestled against the east front of the Sierra Nevada just east of Yosemite National Park, knows about natural hazards. It is still being shaken by an unusual sequence of earthquakes that started in 1978 and included four earthquakes of magnitude 6 within 48 hours...