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...
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...
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...
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...
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...
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...
Use of elevated nest baskets by ducks
Harold A. Doty, F.B. Lee, A.D. Kruse
1975, Wildlife Society Bulletin (3) 68-73
Open-top nest baskets were mounted on upright metal poles in various wetlands to assess the value of baskets as a potential technique for increasing duck nest success. Observations were made from 1966-1968 in North and South Dakota, Minnesota, and Wisconsin and were continued through 1973 in North Dakota. Baskets were...
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...
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...
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...
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...
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...
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....
Heavy minerals in stream sands of the southern Hazara District, Pakistan
Karl W. Stauffer
1975, Open-File Report 75-360
The areal distribution of heavy minerals in 99 samples from stream sands in the southern Hazara District, West Pakistan, indicates that the metamorphic grade of the rocks in the area increases toward the northwest. Minerals of potential economic value in the heavy-mineral samples include scheelite from the Oghi-Batgram-Battal area and...
Seismic reflection profiles R/V Polaris, March 1972 offshore southern California Pt. Conception cruise
Stephen C. Wolf
1975, Open-File Report 75-166
No abstract available....
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...
Schlumberger soundings and total field measurements in the Raft River geothermal area, Idaho
Adel A. R. Zohdy, Dallas B. Jackson, Robert J. Bisdorf
1975, Open-File Report 75-130
No abstract available....
Palynological and stratigraphic investigations of four deep wells in the Salisbury Embayment of the Atlantic Coastal Plain
Eleanora I. Robbins, William J. Perry Jr., James A. Doyle
1975, Open-File Report 75-307
Use of palynological zones defined by Brenner and Doyle from the Cretaceous outcrop belt in Maryland, Delaware, and New Jersey permit correlation of the Cretaceous section in four wells drilled to basement in the Salisbury Embayment in the Eastern Shore of Maryland and in Accomack Co., Virginia. These correlations, supplemented...
Dynamics of turbidity plumes in Lake Ontario
Edward J. Pluhowski
1975, Open-File Report 75-249
Large-turbidity features along the 275-kilometre long south shore of Lake Ontario were analyzed using LANDSAT-1 images. The ESIAC system developed by the Stanford Research Institute, was used to obtain enlargements and false-color renditions of turbidity plumes. After projection on a video screen, individual turbidity features were analyzed, mapped, and photographed.The...
A technique for estimating the magnitude and frequency of floods in Maine
Richard Arthur Morrill
1975, Open-File Report 75-292
No abstract available....
Water-resources appraisal of the Carson River basin, western Nevada
Patrick A. Glancy, T. L. Katzer
1975, Open-File Report 75-179
No abstract available....
Seismic-reflection profiles, R/V Kelez, Nov-Dec. 1973, continental borderland of southern California
George William Moore, Larry A. Beyer
1975, Open-File Report 75-330
No abstract available....
Hydrologic data of the coastal drainage basins of southeastern Massachusetts, Weir River, Hingham, to Jonas River, Kingston
John R. Williams, Richard E. Willey, Gary D. Tasker
1975, Massachusetts Hydrologic - Data Report 16
The principal basins are those of Weir River, James Brook, Bound Brook, North River, South River, and Jones River, all draining to Massachusetts Bay and Cape Cod Bay. These basins are bounded on the north by the Weymouth River basins, on the west by the Taunton River basin, and on...
The seismic history of the Rio Grande Rift
J.P. Hoffman
1975, Earthquake Information Bulletin (USGS) (7) 8-13
The Rio Grande Rift, one of the major geologic structures of the Southwest, cuts through the center of New Mexico from north to south. The rift is also referred to as the Rio Grande Trench and as the Rio Grande Trough. It extends from the northern end of the San...
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...
