Fitting Richards' curve to data of diverse origins
Douglas H. Johnson, A.B. Sargeant, S.H. Allen
1975, Growth (39)
Published techniques for fitting data to nonlinear growth curves are briefly reviewed, most techniques require knowledge of the shape of the curve. A flexible growth curve developed by Richards (1959) is discussed as an alternative when the shape is unknown. The shape of this curve is governed by a specific...
Effects of agricultural burning on nesting waterfowl
E.K. Fritzell
1975, Canadian Field-Naturalist (89) 21-27
Agricultural burning in an intensively farmed region within Manitoba's pothole district is shown to affect the nesting activities of ground-nesting ducks. All species, except Blue-winged Teal (Anas discors), preferred unburned nest cover, although success was higher in burned areas, where predators may have exerted less influence. Attitudes of farmers, burning...
Precambrian and Lower Ordovician rocks in east-central Idaho
Edward Thompson Ruppel, R. J. Ross Jr., David Schleicher
1975, Professional Paper 889
No abstract available....
Thoracic collapse as affected by the retia thoracica in the dolphin
Clifford A. Hui
1975, Respiration Physiology (25) 63-70
The carcass of a subadult female Delphinus was placed in a hyperbaric chamber and subjected to two simulated dives each equivalent to 69.7 m. In one dive the thorax was in its natural state, and in the other 100 ml of water had been injected into each pleural cavity. Various morphometric...
A comprehensive list of the most important diseases of fishes and the drugs and chemicals used for their control
S. F. Snieszko
1975, Tropical Fish Hobbyist (24) 14-15, 19
Chemicals used most frequently for control of infectious diseases of fishes
S. F. Snieszko
1975, Fish Health News (4) 2-7
Location of the non-tidal current null zone in northern San Francisco Bay
David H. Peterson, T. J. Conomos, W. W. Broenkow, Patrick C. Doherty
1975, Estuarine and Coastal Marine Science (3) 1-11
Variations in Sacramento-San Joaquin River discharge into northern San Francisco Bay causes shifts in location of the bottom density current null zone. At a river flow of 2000 m3/s this null zone is approximately 20 km from the seaward end of the estuary,...
Marine terraces; datum planes for study of structural deformation
N.K. Huber
1975, Earthquake Information Bulletin (USGS) (7) 3-7
Along the earthquake-prone coastal area of north-central California, geologists are searching for criteria to establish the nature, extent, and rate of crustal movement or deformation that may be related to activity along known or postulated faults. This search has led to a study of marine terraces along the coast between...
Mineral resource models and the Alaskan Mineral Resource Assessment Program
Donald A. Singer
W. A. Vogely, editor(s)
1975, Book chapter, Mineral materials modeling A state-of-the-art review
The least exacting demand that can be made of any model is that it serves as a device whereby we can predict actual physical happenings. Another demand which could be made is that the physical happenings predicted be in some way relevant to man, either by allowing him to anticipate...
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...
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...
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. ...
Modes of fossil preservation
J. M. Schopf
1975, Review of Palaeobotany and Palynology (20) 27-53
The processes of geologic preservation are important for understanding the organisms represented by fossils. Some fossil differences are due to basic differences in organization of animals and plants, but the interpretation of fossils has also tended to be influenced by modes of preservation....
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...
Survival of wood duck and mallard broods in north-central Minnesota
I.J. Ball, D.S. Gilmer, L.M. Cowardin, J. H. Riechmann
1975, Journal of Wildlife Management (39) 776-780
Duckling survival in wood duck (Aix sponsa) and mallard (Anas platyrhynchos) broods was estimated from data obtained from 71 radio-marked brood hens on a study area in north-central Minnesota. Radio-marked hens produced 30 broods during the study, and 41 hens already leading broods were captured and radio-marked. Production estimates based...
The Pocatello Valley, Idaho, earthquake
A. M. Rogers, C.J. Langer, R.C. Bucknam
1975, Earthquake Information Bulletin (USGS) (7) 16-18
A Richter magnitude 6.3 earthquake occurred at 8:31 p.m mountain daylight time on March 27, 1975, near the Utah-Idaho border in Pocatello Valley. The epicenter of the main shock was located at 42.094° N, 112.478° W, and had a focal depth of 5.5 km. This earthquake was the largest in...
Limnological data for Donner Lake, California, May 1973 through December 1973
Alex E. Dong
1975, Report
Donner Lake is easily accessible to the metropolitan areas of Sacramento and San Francisco and is close to many recreational areas in the Sierra Nevada. The lake is used for recreation and is bordered by commercial establishments, summer vacation homes, and a large state campground. Domestic wastes around the lake...
Water resources data for New York, water year 1974; Part 2, Water quality records
Water Resources Division, U.S. Geological Survey
1975, Water Data Report NY-74-2
No abstract available. ...
Trace element evaluation of a suite of rocks from Reunion Island, Indian Ocean
R. A. Zielinski
1975, Geochimica et Cosmochimica Acta (39) 713-734
Reunion Island consists of an olivine-basalt shield capped by a series of flows and intrusives ranging from hawaiite through trachyte. Eleven rocks representing the total compositional sequence have been analyzed for U, Th and REE. Eight of the rocks (group 1) have positive-slope, parallel, chondrite-normalized REE fractionation patterns. Using a...
A comparison of observer and camera counts of desert bighorn sheep
C. L. Douglas
1975, Technical Report CPSU/UNLV 006/04
No abstract available at this time...
Toxicity of the lampricide 3-trifluoromethyl-4-nitrophenol (TFM) to nontarget fish in flow-through tests
L. L. Marking, T.D. Bills, J. H. Chandler Jr.
1975, Investigations in Fish Control 61
Abstract not submitted to date...
Preliminary description and interpretation of cores and radiographs from Clear Lake, Lake County, California: Core 7
John D. Sims, Michael J. Rymer
1975, Open-File Report 75-144
Clear Lake, California is located in the California Coast Ranges about 120 km north of San Francisco and is the largest freshwater lake wholly within California. The lake basin is tectonically controlled (Anderson, 1936; Brice, 1953, Sims and Rymer, 1974) and the area seismically active (Coffman and von Hake, 1973).Interest...
A technique for estimating the magnitude and frequency of floods in Maine
Richard Arthur Morrill
1975, Open-File Report 75-292
No abstract available....
Mineral deposits, occurrences, and associated altered rocks in Southwest Seward Peninsula, western Alaska
C. L. Hummel
1975, Open-File Report 75-2
No abstract available....
PCB's in Suburban Watershed, Reston, Va
J.M. Martell, D. A. Rickert, F.R. Siegel
1975, Environmental Science & Technology (9) 872-875
No abstract available....
