Determining earthquake recurrence intervals from deformational structures in young lacustrine sediments
John D. Sims
1975, Tectonophysics (29) 141-152
Examination of the silty sediments in the lower Van Normal reservoir after the 1971 San Fernando, California earthquake revealed three zones of deformational structures in the 1-m-thick sequence of sediments exposed over about 2 km2 of the reservoir bottom. These zones are correlated with moderate earthquakes that shook the San Fernando...
The new Martian nomenclature of the international Astronomical Union
Vaucouleur G. de, J. Blunck, M. Davies, A. Dollfus, I.K. Koval, G. P. Kuiper, H. Masursky, S. Miyamoto, V.I. Moroz, C. Sagan, B. Smith
1975, Icarus (26) 85-98
A new nomenclature for Martian regions and topographic features uncovered by Mariner 9, as officially adopted by the International Astronomical Union, is described. About 180 craters, generally of diameters >100 km, have been named, as well as 13 classes of topographic...
Sandrewia, n. gen., a problematical plant from the Lower Permian of Texas and Kansas
S.H. Mamay
1975, Review of Palaeobotany and Palynology (20) 75-83
Sandrewia, n. gen., monotypified by S. texana, n. sp., is a plant from Lower Permian beds of north-central Texas and east-central Kansas. It is characterized by stout axes with spirally disposed, laxly inserted, petiolate leaves; the laminae are broadly flabelliform with coarse, open venation....
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...
Duck plague: carrier state and gross pathology in black ducks
Jorge E. Ossa
1975, Thesis
Duck plague (UP) is a highly fatal disease of ducks, geese, and swans (family Anatidae), produced by a reticulo-endotheliotrophic virus classified as a member of the Herpesvirus group. The disease was recognized in Europe in 1949. On the American continent, the disease was first diagnosed in the United States in...
Utilization of algae by fish: Final report to Hercules Incorporated, Wilmington, Delaware
J.G. Stanley, James E. Ellis, Jack B. Jones, W.H. Hastings
1975, Report
No abstract available at this time...
Search for blood protozoans in the American woodcock
W.B. Krohn, J.R. Hynson
1975, Journal of Wildlife Diseases (11) 107-108
Smears were prepared from heart blood of 55 woodcock collected in central Maine between spring and fall, 1972 and 1973. Peripheral blood taken from the wings of 41 of these birds also was examined. Examination of stained films revealed no infected blood cells. Samples of heart blood from 35 of...
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...
Death feigning by ducks in response to predation by red foxes (Vulpes fulva)
Alan B. Sargeant, L. E. Eberhardt
1975, American Midland Naturalist (94) 108-119
Predation by captive red foxes (Vulpes fulva) on approximately 50 ducks comprised of five species was observed in tests conducted at the Northern Prairie Wildlife Research Center, Jamestown, North Dakota. Most ducks were attacked from a rear or lateral position and seized in the cervical or thoracic region. All birds...
A spring aerial census of red foxes in North Dakota
A.B. Sargeant, W.K. Pfeifer, S.H. Allen
1975, Journal of Wildlife Management (39) 30-39
Systematic aerial searches were flown on transects to locate adult red foxes (Vulpes vulpes), pups, and rearing dens on 559.4 km2 (six townships) in eastern North Dakota during mid-May and mid-June each year from 1969 through 1973 and during mid-April 1969 and early May 1970. The combined sightings of foxes...
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...
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...
Longevity of nonsprouting Ceanothus
Jon E. Keeley
1975, American Midland Naturalist (93) 504-507
Evidence is presented indicating species of Ceanothus in the subgenus Cerastes are generally longer-lived than species in the subgenus Euceanothus. It is proposed that this is due, at least in part, to the unique stem morphology of the former. The stems of these plants have a ribbed appearance which arises...
Chemicals used most frequently for control of infectious diseases of fishes
S. F. Snieszko
1975, Fish Health News (4) 2-7
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
Thin-section electron microscopy of mature Myxosoma cerebralis (Myxosporidea) spores
P.D. Lunger, B.L. Rhoads, K. Wolf, M.E. Markiw
1975, Journal of Parasitology (61) 476-480
The morphology of purified, mature Myxosoma cerebralis spores was examined by thin-section electron microscopy. Surface architecture corresponded closely to that described in an earlier scanning electron microscopy study of this organism (Lom and Hoffman, 1971). A uniformly thick spore wall is composed of finely granular, electron-lucent material. Intrawall "valvoplasm" at...
Productivity and flowering of winter ephemerals in relation to Sonoran Desert shrubs
William L. Halvorson, Duncan T. Patten
1975, American Midland Naturalist (93) 311-319
Ephemeral plant biomass and density on a Sonoran Desert hill near Cave Creek, Arizona, vary relative to shrub canopy type and shrub density. Higher shrub density associated with increased elevation appears to decrease both ephemeral biomass productivity and density, while ephemeral growth is enhanced under a shrub canopy if it...
Mineral upplementation of diets containing soybean meal as a source of protein for rainbow trout
H. G. Ketola
1975, Progressive Fish-Culturist (37) 73-75
No abstract available....
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...
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...
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...
Variation in response of channel catfish to Henneguya sp. infections (Protozoa: Myxosporidea)
J. P. McCraren, M.L. Landolt, G. L. Hoffman, F. P. Meyer
1975, Journal of Wildlife Diseases (11) 2-7
Infections in channel catfish (Ictalurus punctatus, Rafinesque) induced by the sporozoan Henneguya (Protozoa: Myxosporidea) result in seven known and diverse disease manifestations. Most outstanding is an interlamellar branchial form responsible for significant losses among immature catfish, and a unique papillomatous form. The question of whether or not the species of Henneguya involved in these...
Effects of pH on toxicity of antimycin to fish
L. L. Marking
1975, Journal of the Fisheries Research Board of Canada (32) 769-773
Detoxification of antimycin at pH 9.5 was caused by two factors. The piscicide was biologically unavailable at the high pH, and this unavailability was reversed by decreasing the pH of water solutions. Simultaneously antimycin detoxified with time, and the resulting loss in toxicity was irreversible. The toxicity of antimycin was...
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...
