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Page 6265, results 156601 - 156625

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Publication Extents

Not all publications have extents, not all extents are completely accurate
A preliminary classification of wetland plant communities in north-central Minnesota
L.M. Cowardin, Douglas H. Johnson
1973, Special Scientific Report - Wildlife 168
A classification of wetland plant communities was developed for a study area in north-central Minnesota in order to analyze data on waterfowl use of habitat that were gathered by radio telemetry. The classification employs features of several earlier classifications in addition to new classes for bogs and lakeshore communities. Brief...
Lake Michigan: Man's effects on native fish stocks and other biota
LaRue Wells, Alberton L. McLain
1973, Technical Report 20
Man's activities have caused great changes in Lake Michigan in the past 120 years. Although changes in water chemistry and lower biota have been generally modest (except locally), those in native fish stocks have been vast. Exploitation, exotic fish species, and eutrophication and other forms of pollution all have played...
Unharvested fishes in the U. S. commercial fishery of western Lake Erie in 1969
Harry D. Van Meter
1973, Special Scientific Report - Fisheries 670
Potential commercial fish production was estimated for U.S. waters of western Lake Erie in 1969 from pounds landed and pounds discarded. Periodic observations of catches in haul seines and trap nets revealed that about 37% of the catch (by weight) in haul seines and 26% of that in trap nets...
The microgravimetric determination of acid-insoluble impurities in the complete analysis of small samples of acid-soluble minerals
Robert Meyrowitz
1973, Journal of Research of the U.S. Geological Survey (1) 207-209
The acid-insoluble impurities of small samples of minerals are determined by a microgravimetric procedure. A Schwarz von Bergkampf glass filter stick with paper filter medium is used to separate the insoluble material. The filtration apparatus and procedural details are described....
Scolecobasidium humicola, a fungal pathogen of fish
A. J. Ross, W. T. Yasutake
1973, Journal of the Fisheries Research Board of Canada (30) 994-995
Scolecobasidium humicola, a previously undescribed fungal pathogen of fish was isolated from coho salmon (Oncorhynchus kisutch). In natural infections the kidney was the organ most affected. The disease was difficult to transmit experimentally and appeared to be only weakly contagious....
Influence of radio packs on captive mallards and blue-winged teal
R. J. Greenwood, A.B. Sargeant
1973, Journal of Wildlife Management (37) 3-9
Back-mounted radio packs of three weights were attached to 30 captive mallards (Anas platyrhynchos) and 30 blue-winged teal (A. discors), and physical condition of the birds was evaluated for 12 weeks. All groups with radio packs lost more weight than did control groups. Feather wear often followed by skin irritation...
History of salmon in the Great Lakes, 1850-1970
John W. Parsons
1973, Technical Paper 68
This history of the salmon in the Great Lakes describes the decline and extinction of the Atlantic salmon (Salmo salar) in Lake Ontario in the 1800's; the failure to establish, by salmon culture, permanent or sizable populations of Atlantic or Pacific salmon in any of the Great Lakes in 1867-1965;...
An empirical NaKCa geothermometer for natural waters
R.O. Fournier, A.H. Truesdell
1973, Geochimica et Cosmochimica Acta (37) 1255-1275
An empirical method of estimating the last temperature of water-rock interaction has been devised. It is based upon molar Na, K and Ca concentrations in natural waters from temperature environments ranging from 4 to 340°C. The data for most geothermal waters cluster near a straight line when plotted as the...
Permafrost
Water Resources Division, U.S. Geological Survey
1973, Report
Waterfowl production on stock-watering ponds in the northern plains
J. T. Lokemoen
1973, Journal of Range Management (26) 179-184
In a 5-year study of stock-watering ponds in western North Dakota, pond size was found to be the major factor influencing duck use. As pond size increased, total pair and brood use per pond increased. Pairs used ponds as small as 0.1 acre in size, but broods were seldom seen...
Ferdinand Vandiveer Hayden and the founding of the Yellowstone National Park
Water Resources Division, U.S. Geological Survey
1973, Report
Following the Civil War, the United States intensified the exploration of her western frontiers to gain a measure of the vast lands and natural resources in the region now occupied by our Rocky Mountain States. As part of this effort, the U.S. Geological and Geographical Survey of the Territories was...
Petrography and stratigraphy of glacial drift, Mesabi-Vermilion Iron Range area, northeastern Minnesota
Thomas C. Winter, R. D. Cotter, H. L. Young
1973, Bulletin 1331-C
Glacial deposits in the Mesabi-Vermilion Iron Range area consist of four major till units and associated glaciofluvial sediments. Particle-size data and pebble, heavy-mineral, clay-mineral, and percentage-soluble content were used in addition to field description of color and texture to describe and correlate the drift units. The lowermost till unit, basal till,...
18O 16O ratios in cherts associated with the saline lake deposits of East Africa
J. R. O’Neil, R. L. Hay
1973, Earth and Planetary Science Letters (19) 257-266
The cherts formed from sodium silicate precursors in East African saline, alkaline lakes have δ18O values ranging from 31.1 to 44.1. The δ18O values correlate in general with lake salinities as inferred from geologic evidence, indicating that most chert was formed...
Snowy owl predation on lapland longspur nestlings recorded on film
T. W. Custer
1973, The Auk (90) 433-435
 During the summer of 1971 I investigated the breeding biology of the Lapland Longspur, Calcarius lapponicus, near Barrow, Alaska. To obtain data on incubation and feeding patterns of nesting longspurs, time-lapse cameras (Minolta Autopak-8 D6 super-8 movie cameras equipped with an Intervalometer-P time-lapse device) were positioned at several nests throughout...
A method to determine waterfowl shooting distances
D.A. Davenport, G.A. Sherwood, H. W. Murdy
1973, Wildlife Society Bulletin (1) 101-105
Long-range shooting at ducks and geese frequently results in a high crippling loss, unretrieved birds and frustrated hunters. A principal problem has been the general inability of hunters or observers to properly judge distance of birds. This paper describes a reasonably accurate method developed to determine shooting distances to geese....