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Inhibition Of Asexual Reproduction In Planaria, Lewis Hafen Leavitt

Theses and Dissertations

Asexual reproduction in the decapitated planaria, Dugesia dorotocephala, is inhibited by an extract of homogenized heads of the same or closely-related species. Decapitated planaria allowed to regenerate have reproduced asexually over 80% of the time, while those that have been cultured in a suspension of head homogenate have had asexual reproduction inhibited to less than 10%. The substance that inhibits asexual reproduction is heat labile. It requires a concentration of 2.0 heads/ml that contains .13 mg protein/ml to effectively inhibit asexual reproduction. A similar concentration of head homogenate from the related planaria, Dugesia tigrina, also contains the inhibitory substance. Head …

Phlyctainophora Squali Sp. Nov. (Nematoda, Philometridae) From The Spiny Dogfish, Squalis Acanthias, Dwight R. Mudry, Murray D. Dailey

Harold W. Manter Laboratory of Parasitology: Library Materials

Summary

Phlyctainophora squali sp. nov. is described from 23 female specimens recovered from the subcutaneous tissue of one of 440 Squalis acanthias caught off Los Angeles, California. This finding represents a new host and distribution for this genus. Phlyctainophora is placed in the family Philometridae on the basis of atrophication of vulva and anus, simple mouth, viviparity and location in tissue of fishes. The family diagnosis for Philometridae is amended to include Phlyctainophora which lacks an anterior ovary.

New Records And Species Of Neotropical Bark Beetles (Scolytidae: Coleoptera), Stephen L. Wood

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 10 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 10 No. 3

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

End Matter, Vol. 10 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Front Matter, Vol. 10 No. 2

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

A Study Of The Weevil Tribe Celeuthetini Of The Solomon Islands (Coleoptera: Curculionidae), Vasco M. Tanner

Brigham Young University Science Bulletin, Biological Series

No abstract provided.

Bird Populations Of Three Oak Forest Areas In Southern Michigan, Ted B. Gottshall

Masters Theses

No abstract provided.

Breeding Biology Of Cassin’S Finch, Carpodacus Cassinii, F. John Erickson Jr.

All Master's Theses

The present study was undertaken in an effort to increase our understanding of this species' life history, with special reference to the functional significance of delayed plumage development in males. Field studies were conducted throughout the breeding season, and efforts were made to determine whether or not sub-adult males were successful in acquiring mates. In conjunction with consideration of the function of delayed plumage development in males of this species, a general review of this phenomenon has been undertaken in the order Passeriformes.

Review Of Waterfowl In Australia By H. J. Frith, Paul A. Johnsgard

Paul Johnsgard Collection

Our dearth of knowledge concerning Australian waterfowl has, until recently at least, been so severe as to once stimulate Ernst Mayr to write a paper (Emu, 45:229-232, 1946) reminding Australians how little was then known about their native waterfowl. The situation was especially serious in view of the fact that no fewer than six of Australia’s 19 species of indigenous waterfowl represent monotypic genera that are largely or entirely restricted to that continent. Furthermore, these include such phylogenetically significant and taxonomically controversial genera as Anseranas, Cereopsis, Malacorhynthus, and Stictonetta, the last two of which have never been available …

Kentucky Warbler (Vol. 45, No. 2), Kentucky Library Research Collections

The Kentucky Warbler

No abstract provided.

The Fisheries Of Deer Creek Reservoir, Utah, With Special Emphasis On The Yellow Perch (Perca Flavescens Mitchill), Gale R. Lewellen

Theses and Dissertations

This thesis is concerned with the fisheries of Deer Creek Reservoir, Wasatch County, Utah, with special emphasis on the yellow perch. The study period was from May 13 to November 24, 1968. Objectives included the determination of size, age, and food habits of the yellow perch. Parasitic occurrences in the perch population by Ligula intestinalis were also recorded as well as the utilization of the perch by the fishermen. Observations on other species of fish including an analysis of rainbow trout stocking programs were also objectives of this thesis. Data was gathered by means of creel census and fish collection …

The Social Organization Of Wild Turkeys On The Welder Wildlife Refuge, Texas, Charles Robert Watts

All Graduate Theses and Dissertations, Spring 1920 to Summer 2023

This study is of the social organization of the wild turkey (Meleagris gallopavo intermedia Sennett) on the Welder Wildlife Refuge in southern Texas.

The earliest turkey nests hatched in April, with the peak of hatching a month or more later. These poults may remain with their mother until winter. This brood flock, however, often combined with other brood flocks to form composite brood flocks when the poults were a few weeks old. Hens not successful in rearing young combined into broodless flocks.

The juvenile males left the brood flocks in late fall or winter. They remained a distinct unit, …

Whole Issue Nebraska Bird Review (April 1969) 37(2)

Nebraska Bird Review

Table of Contents

Treasurer's Report....................18

1968 (Eleventh) Fall Occurrence Report....................19

In Memoriam....................30

Winter Meeting....................30

Notes....................30

1969 Little International Agricultural Exposition Catalog, Little International Agricultural Exposition South Dakota State University

Little International "Little I" Agricultural Exposition Catalogs

No abstract provided.

Aggressive Man And Aggressive Beast, Allen W. Stokes

Faculty Honor Lectures

Whether man can live in harmeny with his environment depends in great measure en his ability to' live with his fellew man. Can man learn to' engineer human seciety in time to' prevent a helecaust? Mere specifically, can we learn to' prevent aggressien er to' channel it harmlessly? The ethelegist leeks upen man's behavier as just part ef the tetal spectrum ef animal behavier. Therefere, much of what we learn abeut the behavier ef lewer animals sheuld relate to' human behavier.

Aggressien is in the headlines every day, and in the past few years there has been a 'Steady stream …

Calf Diarrhea (Scours): Reproduced With A Virus From A Field Outbreak, C. A. Mebus, N. R. Underdahl, M. B. Rhodes, M. J. Twiehaus

Nebraska Agricultural Experiment Station: Historical Research Bulletins

Neonatal calf diarrhea typical of that seen in field cases was produced in colostrum-deprived calves by inoculating either feces or bacteria-free filtrates via the duodenum, orally, or by a spray (aerosol). Three calves, kept free of E. coli, developed severe diarrhea following inoculation with a bacteria-free filtrate. Intense fluorescence in the epithelium of sections of small intestine from two experimental calves was observed following staining with ftuorescein-labeled gamma globulin produced with viral antigen prepared from the feces of two experimental diarrhetic E. coli-free calves. Fluorescing cells were also present in the feces of experimental and field cases of neonatal …

A Microscopic Study Of Dorsal Guard Hairs Of Fifty-Eight Species Of Kentucky Mammals, Leslie E. Meade

Morehead State Theses and Dissertations

A thesis presented to the faculty of the School of Sciences and Mathematics at Morehead State University in partial fulfillment of the requirements for the Degree of Master of Science in Biology by Leslie E. Meade on January 16, 1969

Meteorological Factors Controlling The Emergence Of The Eastern Spadefoot Toad, Scaphiopus Holbrooki Holbrookii Harlan, Larry Judy

Theses, Dissertations and Capstones

Scaphiopus holbrooki holbrookii, the Eastern Spadefoot, can exist in an area for many years before it is detected. Its apparent scarcity can be explained by its secretive, fossorial habitat, protective coloration, and nocturnal behavior. Spadefoots are present at the surface locally in small numbers on any one night. They emerge only when conditions are optimum. One authority has suggested that temperature, moisture, and barometric pressure exert control over emergence.

It was the purpose of this research to discover the most important meterorological parameters and investigate how they control the behavior of Scaphiopus.

Initially the response, emergence to breed was distinguished …

Pollution And Evolution, David J. Merrell

Journal of the Minnesota Academy of Science

Three examples, industrial melanism in moths, insecticide resistance in insects, and myxomatosis in Australian rabbits, are used to illustrate the concept that evolution may result from tampering with the physical or biotic environment of a species. Hence, concern about the effects of pollution must encompass not only the possibility of extinction but the possibility of evolution. In the case of harmful species, biological or chemical control measures may result in populations more refractory to control than the original untreated populations.

Rest Site Selection By Radio-Tagged Raccoons, Jay H. Schnell

Journal of the Minnesota Academy of Science

Daytime resting sites and behavior of 14 radio-tagged raccoons were studied from April 18 to November 27, 1965, with types and use of the sites, daytime activity and shifts at the sites, and approach movements previous to resting being analyzed. The radio system pinpointed 173 rest sites, 7 4 per cent in swamps, 17 per cent in hollow trees, and 9 per cent in squirrel or bird nests. Use of the rest sites did not correlate with habitat type or size of the home range or with distances which animals traveled during their active nightly period. Behavioral influences in selection …

Waterfowl Production In A Selected Wetland Management Area, Orlo A. Quame, Alfred H. Grewe Jr.

Journal of the Minnesota Academy of Science

This study of a Type 5 Federal Wetland Management Area showed that: (1) production (young remaining on the area to flight stage) in birds per acre was 0.74 in 1967 and 0.57 in 1968; (2) the greatest temporary use of the area was mode by blue-winged teal, 64 being sighted at one time; and (3) artificial loafing structures may increase use of a wetland by breeding ducks.

Hemolysis By Crotalus Horridus Atricaudatus Venom, Franklin E. Byrd, Bob D. Johnson

Journal of the Arkansas Academy of Science

No abstract provided.

Systematic Status Of The Mastiff Bat, Eumops Perotis Renatae Pirlot, 1965, James D. Smith, Hugh H. Genoways

University of Nebraska State Museum: Mammalogy Papers

The mastiff bat, Eumops perotis renatae, described by Pirlot in 1966 and later elevated to specific status by the same author is herein regarded as junior synonym of Eumops perotis perotis (Schinz, 1821). Earlier reports of large Eumops from South America are reviewed in light of the present understanding of the relationship between Eumops perotis and E. trurnbulli.

Weed Control In Pastures : A Practical Approach For Sheep Areas, Geoffrey A. Pearce

Journal of the Department of Agriculture, Western Australia, Series 4

IN the past, chemical treatments for the control of weeds in pastures have been costly and severe on pasture, and have had to be repeated over a number of years. The method outlined in this article overcomes nearly all these disadvantages.

Control Of Clover Infertility In Sheep, H G. Neil, H. E. Fels, C. M. Francis

Journal of the Department of Agriculture, Western Australia, Series 4

A summary of practices recommended for the control of infertility caused by subterranean clover in West Australian sheep.

PROLONGED grazing of green subterranean clover pastures often reduces ewe fertility. In more extreme cases, obvious signs of clover disease occur.

Whole Issue Nebraska Bird Review (January 1969) 37(1)

Nebraska Bird Review

Table of Contents

Barnacle Goose Taken in Nebraska.................... 2

Growth and Calculation of Age in the American Goldfinch.................... 3

1968 Fall Field Day ....................15

Albino Screech Owl ....................16

Addition To The List Of Spiders Collected In Clark County, Arkansas, Peggy Rae Dorris

Journal of the Arkansas Academy of Science

No abstract provided.

Propagation Of Pike In Multi-Purpose Lake Management, Oliver M. Jarvenpa, Warren Kirsch

Journal of the Minnesota Academy of Science

Methods for rearing, harvesting, and management use of pike (Esox lucius L) in Minnesota are described, especially as related to multiple use of shallow water areas. Principal emphasis is placed on the method of removing fingerling and yearling pike in winter from shallow lakes. Such lakes often raise wild rice and also are utilized by waterfowl. The pike, spawned naturally in these lakes, are harvested by pumping aerated water through fish traps when oxygen levels in the lake become low. Pumping is most effective when oxygen levels in the lake fall below 2 parts per million but is higher in …