Skip to main content
U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Results

165626 results.

Alternate formats: RIS file of the first 3000 search results  |  Download all results as CSV | TSV | Excel  |  RSS feed based on this search  |  JSON version of this page of results

Page 5508, results 137676 - 137700

Show results on a map

Publication Extents

Not all publications have extents, not all extents are completely accurate
Predation by fish on walleye eggs on a spawning reef in western Lake Erie, 1969-71
David R. Wolfert, Wolf-Dieter N. Busch, Carl T. Baker
1975, Ohio Journal of Science (75) 118-125
Nearly 2,000 fish representing 21 species were captured with experimental gillnets on Kelleys Island Shoal during the spawning and incubation periods of walleyes (Stizostedion v. vitreum) in 1969-71. A total of 794 stomachs were examined. Four species contained walleye eggs: yellow perch (Perca flavescens), spottail shiner (Notropis hudsonius), stonecat (Noturus...
Annual contribution of carbon, nitrogen, and phosphorus by migrant Canada geese to a hardwater lake
Bruce A. Manny, Robert G. Wetzel, W.C. Johnson
1975, International Association of Theoretical and Applied Limnology (19) 949-951
Each year more than 6,000 migrant Canada geese (Branta canadensis interior Todd) rest for 3 to 10 days during the months of March, October, November, and December on Wintergreen Lake, a productive 15 ha (33 acre) hardwater lake in the W. K. Kellogg Bird Sanctuary of Michigan State University in...
Dieldrin in the diet of channel catfish (Ictalurus punctatus): uptake and effect on growth
Ray L. Argyle, George C. Williams, Clara B. Daniel
1975, Journal of the Fisheries Research Board of Canada (32) 2197-2204
Fingerling channel catfish (Ictalurus punctatus) were given diets containing 0, 0.4, 0.8, or 4.0 I?g dieldrin/g of food (dry weight) for 210 days, followed by a dieldrin-free diet for 56 days. Catfish receiving 4.0 I?g dieldrin/g food gained about 17% less weight than the control fish in 210 days and...
Earthquake history of New Mexico
C. A. von Hake
1975, Earthquake Information Bulletin (USGS) (7) 23-26
Most of New Mexico's historical seismcity has been concentrated in the Rio Grande Valley between Socorro and Albuquerque. About half of the earthquakes of intensity V or greater (Modified Mercalli intensity) that occurred in teh State between 1868 and 1973 were centered in this region. ...
Improved digital filters for evaluating Fourier and Hankel transform integrals
Walter L. Anderson
1975, Report
New algorithms are described for evaluating Fourier (cosine, sine) and Hankel (J0,J1) transform integrals by means of digital filters. The filters have been designed with extended lengths so that a variable convolution operation can be applied to a large class of integral transforms having the same...
Thermomagnetic analysis of meteorites, 2. C2 chondrites
D.E. Watson, E.E. Larson, J.M. Herndon, M.W. Rowe
1975, Earth and Planetary Science Letters (27) 101-107
Samples of all eighteen of the known C2 chondrites have been analyzed thermomagnetically. For eleven of these, initial Fe3O4 content is low (generally <1%) and theJs-T curves are irreversible. The heating curves show variable greater (up to 10 times) than it is initially. This...
Leech (Hirudinea) infestations among waterfowl near Yellowknife, Northwest Territories
James C. Bartonek, David L. Trauger
1975, Canadian Field-Naturalist (89) 234-243
Fourteen species of aquatic birds, including 11 species of ducks, were infested with leeches Theromyzon rude and Placobdella ornata near Yellowknife, Northwest Territories. Leeches infested 88% of 41 American Wigeon (Anas americana) and 31% of 86 Lesser Scaup (Aythya affinis) examined after death. Lesser Scaup captured by drive-trapping contained significantly...
Age determination of female redhead ducks
C.W. Dane, Douglas H. Johnson
1975, Journal of Wildlife Management (39) 256-263
Eighty-seven fall-collected wings from female redhead ducks (Aythya americana) were assigned to the adult or juvenile group based on 'tertial' and 'tertial covert' shape and wear. To obtain spring age-related characters from these fall-collected groupings, we considered parameters of flight feathers retained until after the first breeding season. Parameters measured...
Vertical crustal movements preceding and accompanying the San Fernando earthquake of February 9, 1971: A summary
Robert O. Castle, Jack P. Church, Michael R. Elliot, Nancy L. Morrison
1975, Tectonophysics (29) 127-140
Comparative elevations referred chiefly to a tidal bench mark with a history of relatively positive movement show that much of the Transverse Ranges of southern California sustained major changes in elevation both before and in association with the ML 6.4 San Fernando earthquake of February 9, 1971. Preseismic changes in...
Environmental factors affecting the strength of walleye (Stizostedion vitreum vitreum) year-classes in western Lake Erie, 1960-70
Wolf-Dieter N. Busch, Russell L. Scholl, Wilbur L. Hartman
1975, Journal of the Fisheries Research Board of Canada (32) 1733-1743
Commercial production of walleyes (Stizostedion vitreum vitreum) from western Lake Erie declined from 5.9 million pounds in 1956 to 140,000 pounds by 1969. Since 1956, marked irregularity in year-class success has developed. Only four year-classes were considered good during 1959–70. The rate and regularity of water warming during the spring...