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Articles 1 - 23 of 23
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Nesting Ecology Of Raptorial Birds In Central Utah, Joseph R. Murphy, Franz J. Camenzind, Dwight G. Smith, J. Bradford Weston
Nesting Ecology Of Raptorial Birds In Central Utah, Joseph R. Murphy, Franz J. Camenzind, Dwight G. Smith, J. Bradford Weston
Brigham Young University Science Bulletin, Biological Series
No abstract provided.
Front Matter, Vol. 10 No. 4
Brigham Young University Science Bulletin, Biological Series
No abstract provided.
End Matter, Vol. 10 No. 4
Brigham Young University Science Bulletin, Biological Series
No abstract provided.
A Taxonomic And Ecological Study Of The Desmids Of Lily Lake, James L. Pederson
A Taxonomic And Ecological Study Of The Desmids Of Lily Lake, James L. Pederson
Theses and Dissertations
During the summero f 1964 a taxonomica and ecological study was made of the desmids (microscopic green algae) found in Lily Lake. The study site is a subalpine lake in the Wasatch National Forest of the Uinta Mountains, Utah. The lake is located about one-half mile west of Trial Lake at an elevation of approximately 10,000 feet. The lake is an acidic, cold, lentic bog pond characteristic of this region. Desmids were collected at weekly intervals from seven sampling sites. The water temperature, pH, dissolved oxygen, light conditions and length of day from sunrise to sunset were recorded at the …
A Revision Of The Genus Eriogonum (Polygonaceae), James Lauritz Reveal
A Revision Of The Genus Eriogonum (Polygonaceae), James Lauritz Reveal
Theses and Dissertations
The genus Eriogonum is one of North America's largest and most complex group of plants. Found primarily in the western United States where its members are a common feature of the landscape, its overall range is from Alaska to central Mexico and from the Pacific coast to the Atlantic coast. The genus is composed of eight subgenera and 226 species. The purpose of the dissertation is to present an abbreviated revision of the genus following the style format of the North American Flora series. Brief taxonomic descriptions and keys are provided along with details of each taxon's geographical distribution and …
Phylogenetic Relationships Of Purshia Tridentata And Cowania Mexicana, Stewart C. Sanderson
Phylogenetic Relationships Of Purshia Tridentata And Cowania Mexicana, Stewart C. Sanderson
Theses and Dissertations
Because of the greatly increased supply of genetic variation which it provides, introgression is of great importance in determining both the rate and the direction of evolution. Hybridization between the genera Cowania and Purshia provides an excellent model for demonstrating the various products which might be expected from introgression. The present study is an attempt to further investigate phylogenetic relationships of Cowania mexicana and Purshia tridentata by use of cytological and biochemical techniques.
An Investigation Of A Mycorrhizal Association On Opuntia Polyacantha, R. Craig Stutz
An Investigation Of A Mycorrhizal Association On Opuntia Polyacantha, R. Craig Stutz
Theses and Dissertations
Roots of Opuntia, polyacantha Haw. from Juab County, Utah were found to be nodulated. An anatomical study of the nodulated roots showed them to be ectotrophic mycorrhizae. Fusarium poae (Peck) Wollenweaver was found associated with the nodules both as an epiphyte and an endophyte. However, reinfection with this organism failed to induce subsequent nodulation. Under certain conditions the roots of o. polyacantha are able to overcome the mycorrhizal infection and elongate. It is not uncommon for several branch roots to originate from a single nodule. It is suggested that the fungus-root association found in o. polyacantha represents an early stage …
Ultrastructural Investigations Of Tilletia Caries Teliospores, James Vincent Allen
Ultrastructural Investigations Of Tilletia Caries Teliospores, James Vincent Allen
Theses and Dissertations
The purpose of this study was to investigate the ultrastructure of Tilletia caries teliospores. Specimens were prepared for viewing in the electron microscope by freeze-etching and thin-sectioning techniques. Thin-sectioning techniques gave excellent results with the teliospore walls and the lipid bodies within the teliospore but failed to adequately fix the membranes and internal organelle systems. Micrographs of Tilletia caries teliospores prepared using thin-sectioning show three major wall layers and two partition wall layers and abundant lipid bodies. The freeze-etch method of spore preparation proved superior to the thin-sectioning used in this study to reveal the internal organelle systems of the …
A Study Of Conifer Invasion Into Meadows Surrounding Small Lakes And Ponds In The Trial Lake Region Of The Western Uinta Mountains, David Harvey Firmage
A Study Of Conifer Invasion Into Meadows Surrounding Small Lakes And Ponds In The Trial Lake Region Of The Western Uinta Mountains, David Harvey Firmage
Theses and Dissertations
The object of this study was to determine whether or not Lodgepole pine is successfully invading meadows near ponds in the western Uinta Mountains as a preliminary step to the invasion of the Spruce-Fir climax forest. Line transects were established at three sites near Trial Lake extending from forest to wet meadow. Along these transects the soil was studied to determine percent organic matter, pH, depth to mineral soil, and texture. Also the depth of the water table was measured and the topography plotted. The age and size of the trees along the transect was determined, and the extent of …
Surface Characteristics Of Conidia From Monosporous Cultures Of Penicillium Digitatum And Aspergillus Nidulans Var. Echinulatus, Raymond Kunito Fuji
Surface Characteristics Of Conidia From Monosporous Cultures Of Penicillium Digitatum And Aspergillus Nidulans Var. Echinulatus, Raymond Kunito Fuji
Theses and Dissertations
The purpose of this investigation was to evaluate the possible taxonomic significance of the "rodlet" patterns and spore wall configurations of conidia from monosporous cultures of Penicillium digitatum Saccardo and Aspergillus nidulans Eidam var. echinulatus Fennell & Raper. Freeze-etching the conidiospores from single spore isolates of these fungi revealed that spore wall patterns and configurations vary much too greatly to be of taxonomic importance on the strain and subspecies level. Environmental factors and genetic influences are discussed as possible mechanisms causing the variations of the spore wall configurations. A membrane-like structure that covers the "rodlet" patterns and which hinders spore …
The Identification Of A Germination Factor For Basidiospores Of Psilocybe Mutans, Neal K. Van Alfen
The Identification Of A Germination Factor For Basidiospores Of Psilocybe Mutans, Neal K. Van Alfen
Theses and Dissertations
Basidiospores of the Basidiomycete Psilocybe mutans have been found to germinate only in the presence of water extracts of animal dung. The chemical nature of the factor present in the dung that induces germination is not known, nor has it ever been isolated· Experiments showed that extracts of bile salts cause the basidiospores to germinate, indicating that since bile salts are found in dung, they may be the factor which stimulates the spores to germinate. Investigations of the properties of the factor in dung show that the factor has solubility properties that are similar to those of the bile acids. …
A Study Of The Weevil Tribe Celeuthetini Of The Solomon Islands (Coleoptera: Curculionidae), Vasco M. Tanner
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.
New Records And Species Of Neotropical Bark Beetles (Scolytidae: Coleoptera), Stephen L. Wood
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. 2
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.
Flora Of The National Reactor Testing Station, N. Duane Atwood
Flora Of The National Reactor Testing Station, N. Duane Atwood
Theses and Dissertations
The National Reactor Testing Station (NRTS) is located along the western edge of the upper Snake River Plain in southeastern Idaho. The area covered in this study comprises 894 square miles of rolling to broken land. The plain is broken by three large buttes, all volcanic in nature. The Snake River Plain was formed by the interbedding of volcanic rocks, lake, and alluvial deposits. The alluvial deposits are Quaternary in age as are the basalt flows, and the three buttes are middle Teritary. The vegetation is semi-desert and belongs to the northern desert shrub biome. Annual precipitation at the station …
Biochemical And Morphological Analyses Of The Hordeum Jubatum-Brachyantherum-Caespitosum Hybrid Complex, Gareth Roz Babbel
Biochemical And Morphological Analyses Of The Hordeum Jubatum-Brachyantherum-Caespitosum Hybrid Complex, Gareth Roz Babbel
Theses and Dissertations
Hordeum jubatum L., Hordeum brachyantherum nevski, and Hordeum jubatum var. caespitosum (Scribn.) Hitchc. Plants from sites in Utah and Idaho were grown and examined in order to determine whether or not hybridization with subsequent introgression occurs among the species and if so whether there is a difference in the relative amount of gene flow between the parent species H. jubatum and H. brachyantherum in different environments. Hybridizations and morphological analyses were made using standard procedures. Biochemical analyses were made by comparing paper chromatograms of leaf extracts of plant specimens. The results indicate that in Utah populations sampled, hybridization with subsequent …
A Revision Of Cryptantha Subgenus Oreocarya, Larry Charles Higgins
A Revision Of Cryptantha Subgenus Oreocarya, Larry Charles Higgins
Theses and Dissertations
This study is a taxonomic revision of Cryptantha subgenus Oreocarya (Boraginaceae), together with descriptions of species, synonyms, distribution maps, and discussions. The present treatment recognizes fifty-seven species and fourteen varieties, all separated by means of a comprehensive key. A history of the group, along with a discussion of the distribution, ecology, and phylogeny is presented. As a basis for the comparison of taxa much of the research has been concentrated on morphological variation in herbarium specimens. Particular attention has been directed to a study of pubescence types, branching patterns, flowers, calyces, and the fruit. The herbarium research has been correlated …
A Comparative Survey Of Soil Microfungi From Three Vegetation Types In Cedar Valley, Utah, Brent T. Wahlquist
A Comparative Survey Of Soil Microfungi From Three Vegetation Types In Cedar Valley, Utah, Brent T. Wahlquist
Theses and Dissertations
Microfungi were isolated from soil samples by the soil plate method. Soil samples were collected at depths of 0-1", 1-4", and 4-8" both between and beneath the canopy of the dominant vegetation in stands of greasewood, sagebrush, and pinyon-juniper. Salinity, pH, and percent organic matter were measured for each soil sample. A total of 148 strains of fungi representing 141 species and 46 genera were isolated and identified from these alkaline soils, Few strains, including some Aspergilli, occurred only in the more saline greasewood soils, while many strains, including several Penicillia, occurred in both sagebrush and piny-on-juniper soils but were …
A Study Of Aquatic Fungi In Powell's Slough, Chao-Chih Hsiao
A Study Of Aquatic Fungi In Powell's Slough, Chao-Chih Hsiao
Theses and Dissertations
Aquatic fungi in-Powell's Slough were.studied in 1967 & 1968. Collections were made and water temperature, oxygen content & pH values were measured at weekly intervals. For collections, wire baskets containing substrata were submerged in water for one month. After collecting, substrata were brought to the laboratory. Identification was based on the keys of Sparrow, 1960. Aquatic fungi identified included seven orders, nine families, fifteen genera, and thirty species, from thirty-three collections of fifteen types of substrata. The substrata used in this study were: (i) fruits: apples, rose hips, plums, pears, haws; (ii) twigs: poplar, weeping willow, river birch, weeping white …
A Revision Of The Hedysarum Boreale Complex, Terry Edwin Northstrom
A Revision Of The Hedysarum Boreale Complex, Terry Edwin Northstrom
Theses and Dissertations
The Hedysarum boreale complex consists of all North American Members of the genus Hedysarum which possess free wing auricles, sub-equal calyx teeth, hidden leaflet veins, and wingless loment articles. One species, two subspecies, and three varieties are recognized. The traditional methods of comparative morphology are employed in delimiting species in the herbarium, but pertinent data from field work are also included. The somatic chromosome number was determined for all taxa, and was found in all cases to be 16. Distribution maps, illustrations, and graphical comparisons of taxa are included.