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Cytogenetic Studies Of Cercocarpus In Utah, Grant Lloyd Pyrah
Cytogenetic Studies Of Cercocarpus In Utah, Grant Lloyd Pyrah
Theses and Dissertations
Within the genus Cercocarpus H.B.K., commonly called mountain mahogany, there are three species, C. monanus Raf., C. ledifolius Nutt., and C. intricatus S. Wats., that occupy rather distinct habitats in Utah. During the past two years a study of Cercocarpus populations growing throughout Utah has shown not only that hybridization does occur between all three species but that in some instances viable progeny are produced from these F1 hybrids. Despite rather severe isolation barriers, there is sufficient plasticity to permit inter-breeding under certain circumstances.
Distribution Patterns Of Pocket Gophers In The Hobble Creek Area, Utah County, Elvis J. Holt
Distribution Patterns Of Pocket Gophers In The Hobble Creek Area, Utah County, Elvis J. Holt
Theses and Dissertations
This study was initiated to investigate the distribution patterns of two species of pocket gophers, Thomomys umbrinus albicaudatus Hall and T. talpoides wasatchensis Durrant whose ranges come together in the Hobble Creek area, Utah. The effect of certain ecological factors upon their distribution was determined. The ecological factors included: vegetation and land use, soil, moisture and exposure, hybridization and interspecific competition. From morphological examination no interbreeding was detected even though the breeding seasons of the two species correspond. A limited area was found where the ranges of the two species are in contact. A lack of available moisture was determined …
A Taxonomic Study Of Fleas Of The Genus Foxella (Wagner) In Utah (Siphonaptera: Dolichopsyllidae), Robert A. Amoureux
A Taxonomic Study Of Fleas Of The Genus Foxella (Wagner) In Utah (Siphonaptera: Dolichopsyllidae), Robert A. Amoureux
Theses and Dissertations
Fleas of the genus Foxella Wagner, commonly known as "gopher fleas," have various species of the mammal genus Thomomys Weid Neuweid in the Western United States as their hosts. Some workers maintain there are at least two species of fleas while others consider that all gopher fleas are of one species.
Changes In The Vegetation Of Two Restricted Areas Of The Wasatch Plateau As Related To Reduced Grazing And Complete Protection, Hyrum B. Johnson
Changes In The Vegetation Of Two Restricted Areas Of The Wasatch Plateau As Related To Reduced Grazing And Complete Protection, Hyrum B. Johnson
Theses and Dissertations
An understanding of the interactions betnen vegetation and livestock grazing is of paramount importance to the welfare of the livestock industry. It is also important to know how these interactions affect the balance of the ecosystem. In general, observations of changes in vegetation provide an index for evaluating such interactions. Vegetation change is the main object of consideration in this paper. The study is concerned with some of the oldest pemanent native vegetation study plots in the Western United States. They are located on Horseshoe Flats of the Wasatch Plateau in Central Utah.