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Articles 4531 - 4560 of 4569
Full-Text Articles in Life Sciences
The Taxonomy Of Utah Orthoptera With Notes On Distribution, Andrew H. Barnum
The Taxonomy Of Utah Orthoptera With Notes On Distribution, Andrew H. Barnum
Theses and Dissertations
To an entomologist, the Orthoptera1 is in a state of confusion with respect to the available literature. Work has been done, and is now being done on the orthopteran fauna, but manuals tor identification of most species are not available for all sections or the country. Exclusive of a few lim-ited groups, Utah is among the areas that has no complete keys for taxonomic workers. In biological ivenstigations identification is essential: The species being studied must be definitely known. The primary purpose of this study, therefore, is to list the Utah Orthoptera and provide the keys necessary to their critical …
Some Studies On The Consortes Of The Norway Rat In Utah County, Utah, Roy J. Myklebust
Some Studies On The Consortes Of The Norway Rat In Utah County, Utah, Roy J. Myklebust
Theses and Dissertations
This study of the Norway rat, Rattus norvegicus (Erxleben) and its consortes was undertaken in Utah County to determine : (1} the frequency of infection of Trichinella spiralis (Owen) Railliet, the causative organism of trichinosis in humans, (2) the populations of fleas, lice and mites on the rat, and (3) the occurence of other consortes. This study covered a period from January 1951 through June, 1951. Additional records were made available from studies being made by the Department of Zoology and Entomology, Brigham Young University on parasitic arthropods (listed as Project Ten). The species ot fleas, and those mites which …
Galls And Gall Insects Of Artemisia Tridentata Nutt, Solomon Lander
Galls And Gall Insects Of Artemisia Tridentata Nutt, Solomon Lander
Theses and Dissertations
Galls of Artemisia tridentata Nutt. of Utah County were collected and described in detail. Of the ten galls collected, seven were caused by members of the Itonididae, two by members of the Trypetidae, and one by a member of the Curculionidae. Of the seven Itonid galls, six were caused by species of Diarthronomyia, and one by a species of Rhopalomyia. Two of the galls were caused by new species of Diarthronomyia. Three genera of the Scelionidae (Hymenoptera) and four genera of the Chalcidoidea (Hymenoptera) were also reared from the galls. A key to the ten galls was constructed, but does …
A Taxonomic Study Of The Catostomidae Of Utah Lake With Notes On The Fish Population, Lyle Junior Lowder
A Taxonomic Study Of The Catostomidae Of Utah Lake With Notes On The Fish Population, Lyle Junior Lowder
Theses and Dissertations
During the period from October 1950 to March 1951 a study of the taxonomy of the Catostomidae of Utah Lake was undertaken. Throughout this study information was collected on the numbers of suckers taken by some of the fisherman. From the data gathered it appears that the three species of Catostomidae cringinally named from Utah Lake are still there. The external morphological features of these fish are not recognizable unless they are observed very carefully. The most outstanding external characteristics used to differentiate the species are the mouth, lips, papillae on the lips and the general shape of the head. …
A Preliminary Study Of The Distribution Of Fleas In Utah Known To Be Capable And Potential Vectors Of Plague, Dorald M. Allred
A Preliminary Study Of The Distribution Of Fleas In Utah Known To Be Capable And Potential Vectors Of Plague, Dorald M. Allred
Theses and Dissertations
Plague outbreaks in the past have been disastrous where domestic rats and their fleas of certain species were common. Plague has been known to occur in most parts of the world (Robertson 1923), and has occurred as human epidemics for many centuries (Dubos 1948).
Ecology Of Passerine Birds Wintering At Utah Lake, Joseph R. Murphy
Ecology Of Passerine Birds Wintering At Utah Lake, Joseph R. Murphy
Theses and Dissertations
During the period of October to April of the winter of 1950-51, an ecological study was undertaken of a population or passerine birds wintering in a segment of the Utah Lake Shore. Available winter weather data indicated that although such factors as precipitation, temperature, and wind may often be severe, they are not critical enough to prevent a fairly large population of passerine birds from spending the winter months in the study locale. Five fairly distinct plant communities can be recognized in the area. There is evidence which indicates that certain passerine bird species are especially dependent on a particular …
An Ecological Study Of A Sphagnum Lake In The Subalpine Forest Of The Uinta Mountains Of Utah, Howard C. Stutz
An Ecological Study Of A Sphagnum Lake In The Subalpine Forest Of The Uinta Mountains Of Utah, Howard C. Stutz
Theses and Dissertations
A study was made of the ecology and floristics of a small bog lake referred to as Moss Lake, in the Grandaddy lakes region of the Uinta Mountains , Utah . Three consecutive summers, 1948, 1949, and 1950, were spent in collecting the data presented in this study. Throughout the study the following ecological measurements were made: 1. Water 2. Soil 3. Macroscopic vegetation 4. Plankton 5. Macroscopic animal forms.
Alpine Plant Succession Near Mount Emmons, Uinta Mountains, Utah, Joseph R. Murdock
Alpine Plant Succession Near Mount Emmons, Uinta Mountains, Utah, Joseph R. Murdock
Theses and Dissertations
It was to provide some detailed information about the alpine flora , particularly as it relates to successional aspects , that the present study was undertaken . The environmental conditions of weather and soil , as they effect floral composition , are important factors in the plant succession or alpine communities . The investigation was designed to uncover such information about the alpine flora and environment necessary to establish the pattern of succession .
A Taxonomic And Distributional Study Of The Subspecies Of The Iguanid Lizard Uta Stansburiana In The Eastern Great Basin 1950-1951, Dale D. Parker
A Taxonomic And Distributional Study Of The Subspecies Of The Iguanid Lizard Uta Stansburiana In The Eastern Great Basin 1950-1951, Dale D. Parker
Theses and Dissertations
This study is concerned with a critical analysis of species and subspecies of Uta stansburiana as it occurs in the Eastern Great Basin. In this study Urosaurus ornatus wrighti is also briefly discussed since it was until recently considered a member of the genus Uta and since it extends in the area which has been dealt with in this thesis. This problem necessitated study of large series of lizards in order to work out subspeciation. The material from the Brigham Young University collection and the specimens collected by the author total 520. After recording dorsal scale counts, prefrontal scales, keelation …
The Female Genitalia And Spermathecae Of Some Of The Rhynchophora, Herman O. Sanders
The Female Genitalia And Spermathecae Of Some Of The Rhynchophora, Herman O. Sanders
Theses and Dissertations
In this study of the genitalia and spermathecae of the Rhynohophora, eighty-two species, representing sixty genera, were examined as listed in Leng's Catalogue of Coleoptera of North America North of Mexico, together with seven species from the Phillippine Islands and one from China. By using the external female genitalia and spermathecae the Rhynochophora studied may be divided into eight and possibly nine well-defined groups. They are separated into these groups on the basis of the development of the nodulus and ramus and upon the degree of crenulation that occurs in the spermatheca. The spermatheca of all species studied has been …
A Comparative Study Of The Osteology And Myology Of The Thoracic Limb Of The Pocket Gopher And Kangaroo Rat, Leland R. Allen
A Comparative Study Of The Osteology And Myology Of The Thoracic Limb Of The Pocket Gopher And Kangaroo Rat, Leland R. Allen
Theses and Dissertations
The purpose of this study was to determine the morphological differences in the osteology and musculature of the thoracic limb of the pocket gopher and kangaroo rat. This was accomplished by first, collection of specimens, second, the preservation and preparation of bones and muscles tor study and illustration, third, sketching and photographing the sketches, fourth, noting and recording origins and insertions as well as any differences in the modification of anatomy with relation to habitat requirements. These two closely related families, Geomyide and Heteromyidae, show great morphological differences. Comparative volumetric measurements show that the forelimb of the pocket gopher is …
Some Observations On The Embryology And The Weberian Apparatus Of Catostomus Ardens (Jordan And Gilbert), H. Ronald Frogley
Some Observations On The Embryology And The Weberian Apparatus Of Catostomus Ardens (Jordan And Gilbert), H. Ronald Frogley
Theses and Dissertations
The purpose of this study is to add to our knowledge of the embryology and osteology of the Weberian apparatus as found in the sucker, Catostamus ardens J. & G. ot Utah Lake. Observations were made on the embryological development for twenty one days. This information has been discussed and pictures showing the development included. The literature on the osteology ot the Weberian apparatus was reviewed and it is believed that this study presents the first descriptions of the bones of this species. The ossicles were found to be comparatively stable within species indicating some taxonomic value. More study is …
A Comparative Histological Study Of The Adrenal Gland Of Native Rabbits, Ernest I. Gonzalez
A Comparative Histological Study Of The Adrenal Gland Of Native Rabbits, Ernest I. Gonzalez
Theses and Dissertations
A review of the literature shows that extensive work has been done on the morphology and histology of the adrenal gland of the domesticated rabbit, but it appears that little or no work has been done on other members of the order Lagomorpha. Approximately one hundred specimens of rabbits of various ages and sizes, and of both sexes, were collected over a period of nine months. All adrenal glands were fixed by immersion and were embedded in paraffin. The majority or the glands were sectioned at eight or twelve miora, and were stained with Mallory's triple stain. This investigation shows …
A Comparative Anatomical Study Of The Digestive Systems Of The Desert Jack Rabbit And The Pika, Dale Stanley Rupert
A Comparative Anatomical Study Of The Digestive Systems Of The Desert Jack Rabbit And The Pika, Dale Stanley Rupert
Theses and Dissertations
It is the purpose of this study to make gross and histological comparisons of the various segments of the intestinal tracts of the jack rabbit and the pika. The two animals used for this study were the desert jack rabbit (Lepus Californicus deserticola Mearns), and the pika (Ochotona princepts uinta Hollister). The jack rabbits were found only in the desert valleys and low foothills in the areas studied. These areas are typically open bush or sage brush types of communities. The pikas were restricted to certain high rockslides in this region. These areas are described more completely in the section …
A Preliminary Study Of The Siphonapterous Ectoparasites Found On The Mammals Of The Families Cricetidae And Muridae In Utah County, Vernon J. Tipton
A Preliminary Study Of The Siphonapterous Ectoparasites Found On The Mammals Of The Families Cricetidae And Muridae In Utah County, Vernon J. Tipton
Theses and Dissertations
The purpose of this study was to determine the species of fleas infesting the mammals of the families Cricetidae and Muridae in Utah County. This was accomplished by establishing twelve collecting stations throughout the county from which 198 mammals were collected. From these hosts, 392 fleas were collected representing three families, nineteen genera , and twenty-four species. Four species are new to the State of Utah and twenty-two species are recorded from Utah County for the first time.
Life History Studies Of The Mouse, Peromyscus Truei Nevadensis, Lowell S. Miller
Life History Studies Of The Mouse, Peromyscus Truei Nevadensis, Lowell S. Miller
Theses and Dissertations
Peromyscus truel's a fairly common inhabitant of the upper sonaranlife zone of the Western States. It is an excellent laboratory anlmal with the limitation that captivity must be accompanied by forced activlty, in order to keep the animals within the limits of normal activity. This mouse is polyestrous and breeds from early spring to late fall. Observations have shown pregnancy in late September and in early February. It is the writer's belief that ovulation in the ovary occurs only when copulation has taken lace, because corpora lutea has only been found in pregnant or lactating females. The evidence is scanty …
A Seasonal Study Of Food Of Some Birds Of The Wasatch Chaparral, Herbert H. Frost
A Seasonal Study Of Food Of Some Birds Of The Wasatch Chaparral, Herbert H. Frost
Theses and Dissertations
A seasonal change occurred in the type of food consumed by the birds studied. Plant food was more important in the winter than in the summer. Animal food, except in one species, was found to be more important during the summer months. The most important plant foods determined by frequency and listed in order of their abundance were: Helianthus annuus, Celtis sp., Quercus sp., Polygonum convolvulus, Amaranthus blitoides, Chenopodium album, and Amaranthus graecizans. The most important animal foods based on occurance in stomachs examined were: Coleoptera, Hymenoptera, Lepidoptera larvae, Orthoptera, Undetermined larvae, Diptera, Homoptera, Coleoptera larvae, Araneae, and Hemiptera. Seventeen …
A Taxonomic Study Of The Adult Mosquitoes Of Utah County With Notes On The Biology And Distribution Of The More Common Species 1946-1947, Cluff E. Hopla
A Taxonomic Study Of The Adult Mosquitoes Of Utah County With Notes On The Biology And Distribution Of The More Common Species 1946-1947, Cluff E. Hopla
Theses and Dissertations
In Utah County, information has been lacking concerning the taxonomy and distribution of mosquitoes. With the knowledge of this condition, it is felt that information can be presented which will be of value both to the scienoe of Entomology and the area concerned.
History Of The Cotton Mission And Cotton Culture In Utah, Ivan J. Barrett
History Of The Cotton Mission And Cotton Culture In Utah, Ivan J. Barrett
Theses and Dissertations
The writer, being interested in the agricultural project of cotton growing in early Dixie, and finding scarcely anything written on the subject, has gone into the original sources, histories, journals, diaries, etc., and found a reservoir of enlightenment regarding cotton culture in Utah's Dixie. He has tried to assemble from the most important sources, an informative yet interesting study of cotton culture in Utah. The writer in no wise pretends to have exhausted the subject, nor to have reached all the sources. Many of those early cotton growers who did most to produce this staple, kept no record of their …
The External Male Genitalia Of Some Rhynchophora, Arthur F. Bruhn
The External Male Genitalia Of Some Rhynchophora, Arthur F. Bruhn
Theses and Dissertations
Today there is an increasing recognition among taxonomists of the importance of consideration of the complete morphology of insects in classifying them and in arrangming them in their logical phylogenetic sequence. Regarding the Rhynohophora, with which this paper is concerned, some progress toward a more complete understanding has been made. In 1912 Sharp and Muir made a study of the male genital tube of the coleoptera in general and observed that the various specializations they noted in the forms of Rhynohophora examined would doubtless be of future significance. Tanner in 1927 made a similar important study of the female genitalia …
The North American Species Of Smilacina, Desma H. Galway
The North American Species Of Smilacina, Desma H. Galway
Theses and Dissertations
This paper is the result of a taxonomic study of the species of the genus Smilacina occurring naturally in North America north of Mexico. In the past it has been difficult to make satisfactory determinations of members of this genus from existing manuals, especially among western forms. West of the great plains the great diversity in environmental conditions has given rise to a diversity in form of the species that are widely distributed. Many of these forms have been given specific or varietal names recently, and as no comprehensive work on the genus has been done since most of these …
The Influence Of Some Alkali Salts In The Presence Of Various Concentrations Of Calcium On The Growth Of Sporobolus Cryptandrus, Vaughn A. Clayton
The Influence Of Some Alkali Salts In The Presence Of Various Concentrations Of Calcium On The Growth Of Sporobolus Cryptandrus, Vaughn A. Clayton
Theses and Dissertations
This study deals with the reactions of Sporobolus cryptandrus to various concentrations of Utah's most common alkali salts. Its purpose is to determine the effects of various concentrations of sodium chloride, sodium carbonate, and sodium sulphate on the growth and fruiting of Sporobolus cryptandrus, and to determine to what extent, if any, various levels of calcium exert a protective influence against the toxicity of these three salts. In addition to the experimental work a field of study was conducted for the purpose of determining the concentrations of total salts found in soils supporting a good growth of Sporobolus cryptandrus.
Study Of The Aquatic And Semiaquatic Coleoptera In The State Of Utah, Harry P. Chandler
Study Of The Aquatic And Semiaquatic Coleoptera In The State Of Utah, Harry P. Chandler
Theses and Dissertations
The purpose of this paper is to discover and make known the species of aquatic and semiaquatic Coleopters of the sub-order ADEPHAGA which occur in Utah and to give something of their distribution, environment and habits whenever possible. When ever possible the original description or a description from a recent revision has been included for each species. Descriptions given in recent revisions have been regarded as more desirable because they describe the species in comparison with its nearest relatives, while many fo the original descriptions were very incomplete and could not be used to separate many of our present species …
The Distribution Of Plant Types In The Escalante Desert Of Utah With Relation To Soil Conditions, Carlyle B. Lambert
The Distribution Of Plant Types In The Escalante Desert Of Utah With Relation To Soil Conditions, Carlyle B. Lambert
Theses and Dissertations
This problem was a study of plant species in the Escalante Desert, Utah, in relation to soil conditions. The plants were surveyed by the transect-plot method. The plants and soils were analyzed by percentage-frequency techniques. There is no measurable correlation between soil series and the dominant plants which occur on the soils. There is no correlation between soil types and the plants that are dominant on the soil types. There is a definite correlation between textural classes of the soil and the plants that are dominant on these classes.
The Rise And Development Of The Megagametophyte In Yucca Angustissima Engelmann, Antone W. Nisson
The Rise And Development Of The Megagametophyte In Yucca Angustissima Engelmann, Antone W. Nisson
Theses and Dissertations
The studies involved in this investigation are based upon data and materials secured in the sandy areas of Washington and Iron Counties in southern Utah. The regions in which Yucca angustissima is found have a scant vegetation, are dry, sandy to sandy loam, well-drained, and with an elevation of from 2500 to 5000 feet. Watkins (1937) worked out a very extensive report of the megagametophyte development of Yucca rupicola. He begins with the four megaspore stage, and shows next the disintegration of the three micropylar megaspores. He reported that the chalazal megaspore forms eight free nuclei, by three successive divisions, …
A Preliminary Study Of The Vegetative Cover In Spanish Fork Canyon, Utah, Ben S. Markham
A Preliminary Study Of The Vegetative Cover In Spanish Fork Canyon, Utah, Ben S. Markham
Theses and Dissertations
Spanish Fork Canyon is located in central Utah and is part of the Wasatch Mountain range. Since the coming of the white man to this section of country it has been used as a trail. The canyon provides summer range for stock as well as a watershed. Plant densities were determined by the point observation method using series of one-hundred square foot plots. Three areas which have been subject to different grazing uses were studied. The association changes in the canyon are the replacement of sage by slender wheatgrass on the shallow soils and the disclimax condition resulting from over-grazing …
The Influence Of Overgrazing On The Density And Number Of Palatable And Unpalatable Desert Forage Plants, John H. Mcguire
The Influence Of Overgrazing On The Density And Number Of Palatable And Unpalatable Desert Forage Plants, John H. Mcguire
Theses and Dissertations
The data for this problem were collected at the Desert Range Experiment Station and on adjoining public domain lands during the summer of 1934, for the purpose of studying the influence of overgrazing on the increase of palatable and unpalatable desert forage plants. A vegetative description of the two areas studied has been prepared and presented.
A Further Study Of Utah Asilidae, D. Elmer Johnson
A Further Study Of Utah Asilidae, D. Elmer Johnson
Theses and Dissertations
This study is based on a similar study made by Claudeous J. D. Brown in 1928, and published in 1929. The species he used have been rechecked, and additional ones have been studied. The species considered in this study represent three of the four subfamilies of North American Asilidae. These three subfamilies are Dasypogoninae, Laphriinae, and Asilinae. This study is limited to those species in the Brigham Young University Collections, and to species recorded in print. No claim is here made that all the forms inhabiting the state have been discovered, in fact the writer is well aware of the …
The Development Of The Embryo Of Iris Missouriensis Nutt, C. Eugene Larsen
The Development Of The Embryo Of Iris Missouriensis Nutt, C. Eugene Larsen
Theses and Dissertations
There is but a single species of Iris native to Utah. This is Iris missouriensis Nutt. This plant was chosen for investigation because of its possible significance and because material of this species was readily available. The embryo of Iris missouriensis Nutt. shows some resemblance to the Lily type in its development of an irregular dividing suspensor. It also resembles the Orchid type in the usual development of sixteen cells before the dermatogen is cut off. In general development, however, the writer believes it to have an embryo sequence more similar to the Alisma type than to the dexcriptions given …
A Taxonomical, Morphological And Distributional Study Of The Utah Cyprinidae /|Cby Sheldon Phipps Hayes, Sheldon Phipps Hayes
A Taxonomical, Morphological And Distributional Study Of The Utah Cyprinidae /|Cby Sheldon Phipps Hayes, Sheldon Phipps Hayes
Theses and Dissertations
The hydrography of Utah may be thought of as being roughly divided into two large general drainage areas--, the Colorado River draining the eastern halt and southern portion ot the state and the Bonneville Drainage encompassing the remaining part of it. Earlier workers have listed eight genera and fourteen species of minnows occuring in Utah. Of these this report includes seven genera and ten species found within the borders of our state.