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Full-Text Articles in Physical Sciences and Mathematics
Effects Of Dieldrin On Reproduction Of Penned Hen Pheasants In The Second Generation, William Lyman Baxter
Effects Of Dieldrin On Reproduction Of Penned Hen Pheasants In The Second Generation, William Lyman Baxter
Electronic Theses and Dissertations
Effects of dieldrin on penned hen pheasants (Phasianus colchicus) which were the offspring of hens receiving encapsulated dieldrin the previous year were measured. Hens produced by the previous year's control group received 0, 6, 8, or 12 mg of dieldrin per week for 14 weeks. Hens from treated groups received 0 or 6 mg per week. Effects of dieldrin were evaluated by influences upon reproductive success. Mortality occurred in all groups receiving dieldrin, and appeared to be correlated with a reduction in egg production. Dieldrin lowered egg production by reducing food consumption in the 12 mg group and two groups …
The Fish Population Of Lake Poinsett, South Dakota, As Indicated By The Catch, James C. Congdon
The Fish Population Of Lake Poinsett, South Dakota, As Indicated By The Catch, James C. Congdon
Electronic Theses and Dissertations
Gill nets, trap nets, an otter trawl, and a boom-type electric shocker were utilized to obtain samples of the fish population of Lake Poinsett, South Dakota. The species and size composition of the samples differed significantly with time of season, time of day, location on the lake, and type of gear. Decreased activity following spawning was the apparent cause of a midsummer decline in gill net and trap net catches of black bullhead, black crappie, and white crappie. A late summer increase in the catch of yearling black bullheads, crappies, white bass, carp and bigmouth buffalo was attributed to an …
Evaluations Of Techniques For Estimating Fall Age Ratios Of Canada And Snow Geese, Kenneth Frederick Higgins
Evaluations Of Techniques For Estimating Fall Age Ratios Of Canada And Snow Geese, Kenneth Frederick Higgins
Electronic Theses and Dissertations
Validity of flock counts, average group-size counts, cannot-net catches, and hunter-bag checks for estimating productivity of lesser snow geese (Anser caerulescens caerulescens) and small Canada geese (Branta cnadensis hutchinsii-parvipes complex) was studied at Sand Lake and Tewaukon National Wildlife Refuges during fall, 1965 and 1966. Age-ratios obtained from flock counts vaired with the number of flocks sampled, wind velocity and amount of sky cover. If adequate sampling sites are selected and weather conditions are standardized, age ratio data from flock counts are of value for assessing productivity. Variation in group composition and number contributed to the bias in average group-size …
Survival, Growth, And Food Habits Of Brook Trout Introduced Into An Eastern South Dakota Stream, Larry W. Kallemeyen
Survival, Growth, And Food Habits Of Brook Trout Introduced Into An Eastern South Dakota Stream, Larry W. Kallemeyen
Electronic Theses and Dissertations
Brook trout were introduced into the South Fork Yellow Bank River, an eastern South Dakota stream, on October 11, 1966. A supplemental brook trout plant was made on June 8, 1967. Survival for the initial plant from October, 1966 through October, 1967 was 2.4%. Survival for the supplemental plant from June, 1967 through October, 1967 was 21.0%. Trout from both plants took part in spawning activities during the fall of 1967. Average length of trout from the initial plant increased 9.8 cm during one year. Their average condition factor reached a peak in June, 1967 after being low throughout the …
A Survey Of Pollution On Selected Streams In The Black Hills Of South Dakota, Thomas J. Jurgens
A Survey Of Pollution On Selected Streams In The Black Hills Of South Dakota, Thomas J. Jurgens
Electronic Theses and Dissertations
Seven Streams in the Black Hill of South Dakota were surveyed to determine the influence of suspected sources of pollution on these streams. The sources of pollution included both sewage treatment plant effluents and mining wastes. A comparison of the benthic fauna community below a pollution source to that above it was the primary basis for evaluating the effect of the pollution source on the stream. The results of the benthic fauna samples indicated that the streams surveyed were being polluted. The degree of pollution of each stream was also indicated by these results. Chemical analysis were sued to verify …
Movements And Behavior Of Pheasants During The Breeding Cycle As Determined By Radio-Tracking, Thomas L. Kuck
Movements And Behavior Of Pheasants During The Breeding Cycle As Determined By Radio-Tracking, Thomas L. Kuck
Electronic Theses and Dissertations
Behavior and movement studies were carried out on the Rifle-Calahan Study area, Sanborn County, South Dakota, in 1965 and 1966. Objectives of the study were to evaluate radio telemetry techniques, determine the territorial area and home range of the hen and cock, study the behavior pattern of hen and cock in the harem makeup, determine the distance traveled by the hen when attracted to the harem, determine if the hen nests in the immediate area of the crowing territory, and study the behavior of the hen while nesting and caring for the brood. Twenty adult pheasants (16 hens and 4 …
Limnology Of Selected South Dakota Lakes, Artwin E. Schmidt
Limnology Of Selected South Dakota Lakes, Artwin E. Schmidt
Electronic Theses and Dissertations
Physical, chemical, and biological aspects of 45 lakes in South Dakota were studied from July 1965 to July 1967. Maximum water temperature at the surface reached 28 C. Most of the lakes studied exhibited continuous circulation except when ice covered. Thermocline formation was observed in six of the lakes. Light transmission was influenced by turbidity, and varied greatly within individual lakes and among lakes. Dissolved oxygen concentrations ranged from near saturation to less than the recommended minimum for fish life. All likes studied were basic ranging from a pH of 7.1 to 11.3. Specific conductance of lakes occupying open basins …
Ecological Relationships Of Breeding Blue-Winged Teal To Prairie Potholes, Roderick C. Drewien
Ecological Relationships Of Breeding Blue-Winged Teal To Prairie Potholes, Roderick C. Drewien
Electronic Theses and Dissertations
Ecology and behavior of breeding blue-winged teal (Anas discors) were studied in northeastern Day County, South Dakota in 1965 and 1966. Breeding pair use of the wetland habitat and importance of Type 1 ponds in the wetland complex were evaluated. Pair densities of 30.7 and 33.0 per square mile in 1965 and 1966, respectively, were above the 16-year average from 1950-66 and near maximum. Blue-winged teal comprised 46.7 percent of the waterfowl breeding population in 1965 and 51.7 percent in 1966. Number of water areas per square mile through mid-spring 1965 was comparable to the average for the 16-year period …
Snapping Turtle Life History On Lacreek Refuge, South Dakota, Donald Arthur Hammer
Snapping Turtle Life History On Lacreek Refuge, South Dakota, Donald Arthur Hammer
Electronic Theses and Dissertations
Investigations of the snapping turtle population on Lacreek National Wildlife Refuge in south-central South Dakota were conducted during 1965-67. Turtles captured by trapping, “hooking”, boxing nests and catching nesting females were measured, marked and released. Turtles were marked by toe-clipping, routing, flagging, and tagging. Attaching a metal tag with a “pop-rivet gun” was the most successful marking technique. Molluscs (95 percent frequency) and vegetation (91 percent frequency) were the most important food items of 22 turtles captured on Valentine Refuge in north-central Nebraska. Bird remains were found in 23 percent of the stomachs. Recapture of marked turtles indicated that individual …
Life History And Ecology Of The Black-Footed Ferret In The Wild, Conrad N. Hillman
Life History And Ecology Of The Black-Footed Ferret In The Wild, Conrad N. Hillman
Electronic Theses and Dissertations
Twenty-one black-footed ferrets (Mustela nigripes) were observed at six different locations in southwest South Dakota between April 1966, and September 1967. All observations were made on black-tailed prairie-dog (Cynomys ludovicianus) towns from 15 to 100 acres in size. Because of the proximity of towns inhabited by ferrets, it was possible that individual animals were observed in more than one location. Three litters of ferrets were studied. Young ferrets were most active during early morning and late evening hours. Ferrets remained as a group until early fall when dispersal evidently occurred. Young ferrets accepted live-tethered and dead prairie dogs, mice, cottontails …
Food Habits And Energy Utilization Of Badgers, Grant K. Jense
Food Habits And Energy Utilization Of Badgers, Grant K. Jense
Electronic Theses and Dissertations
A study was initiated in 1966 to determine food habits and energy utilization of badgers. Digestive tracts were collected in eastern South Dakota from November 1966 to November 1967. A male and a female badger were used for two energy-balance and three digestion trials. Ground squirrels, mice and rabbits were found to be the most important mammal foods eaten. Birds and eggs were only eaten during spring and summer. Toads and grains were important fall foods. Insects were eaten throughout the year but usually only in trace amounts. However, when available, badgers ate large quantities of beetles and ground-nesting bees. …
Fishes Of The Big Sioux River, James A. Sinning
Fishes Of The Big Sioux River, James A. Sinning
Electronic Theses and Dissertations
An understanding of the fishes and limnology of a river is essential to the effective management of the river. The climate, soils, and agricultural practices in eastern South Dakota create unusual characteristics in rivers draining that area. One of the principal rivers of the area is the Big Sioux River. Fishes of this river were first studied about 1900 by Meek and by Everman and Cox (Bailey and Allum, 1962). A later survey by Churchill and Over (1933) apparently included the Big Sioux River, but collection data were inadequate for detailed comparisons. Since that time collections of fishes were made …