Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 30 of 65
Full-Text Articles in Entire DC Network
Index [And Table Of Contents] To Volume 40
Index [And Table Of Contents] To Volume 40
Great Basin Naturalist
No abstract provided.
Impact Of The 1975 Wallsburg Fire On Antelope Bitterbrush (Purshia Tridentata), Fred J. Wagstaff
Impact Of The 1975 Wallsburg Fire On Antelope Bitterbrush (Purshia Tridentata), Fred J. Wagstaff
Great Basin Naturalist
Antelope bitterbrush (Purshia tridentata) is a preferred browse species that is susceptible to decreases in population density due to fire. The reduction in density of this species due to fire was determined by sampling areas within and adjacent to the burn. The 1975 burn caused a significant reduction in the population density of bitterbrush. It was also determined that rate of growth was lower for plants within the burn.
A New Species Of Fossil Chrysothamnus (Asteraceae) From New Mexico, Loran C. Anderson
A New Species Of Fossil Chrysothamnus (Asteraceae) From New Mexico, Loran C. Anderson
Great Basin Naturalist
The new, presumably extinct species, Chrysothamnus pulchelloides, is formally described and illustrated. The plant materials came from Holocene packrat middens. Anatomical and phyletic relationships of the fossil species to extant taxa are discussed.
Field Observations On The Response Of The Railroad Valley Springfish (Crenichthys Nevadae) To Temperature, Thomas M. Baugh, Bruce G. Brown
Field Observations On The Response Of The Railroad Valley Springfish (Crenichthys Nevadae) To Temperature, Thomas M. Baugh, Bruce G. Brown
Great Basin Naturalist
The presence of Crenichthys nevadae Hubbs is verified from 37.8 to 18.3 C in the Big Springs aquatic system.
Postemergence Development And Interyear Residence Of Juvenile Columbian Ground Squirrels In The Idaho Primitive Area, Charles L. Elliott, Jerran T. Flinders
Postemergence Development And Interyear Residence Of Juvenile Columbian Ground Squirrels In The Idaho Primitive Area, Charles L. Elliott, Jerran T. Flinders
Great Basin Naturalist
A colony of Columbian ground squirrels in the Idaho Primitive Area was observed from 1976 to 1978. Seven body measurements were recorded for juveniles obtained in 1978. There was a lack of sexual dimorphism among developing juveniles. The hind foot was the fastest developing feature. Juveniles obtain adult size their second year. Juvenile males exhibited the lowest interyear residency of either sex or age group examined.
Woodrat Nest Flea Anomiopsyllus Amphibolus In Southeastern Oregon, Harold J. Egoscue
Woodrat Nest Flea Anomiopsyllus Amphibolus In Southeastern Oregon, Harold J. Egoscue
Great Basin Naturalist
The flea Anomiopsyllus amphibolus is reported from southeastern Oregon, a range extension of about 475 km from the nearest reported localities in northwestern Utah.
New American Bark Beetles (Coleoptera: Scolytidae), With Two Recently Introduced Species, Stephen L. Wood
New American Bark Beetles (Coleoptera: Scolytidae), With Two Recently Introduced Species, Stephen L. Wood
Great Basin Naturalist
Species named as new to science include: Conophthorus michoacanae, C. teocotum, Hylesinus aztecus (Mexico), Phloeocleptus punctatus (Costa Rica), Pseudothysanoes atomus (Venezuela), P. leechi (California), Pityogenes mexicanus, Araptus speciosus, Amphicranus spectus (Mexico), and Xyleborus praestans (Panama). Also reported are the first records of the notorious Xylosandrus compactus (Eichhoff) from South America (Brazil), and the first American records of Xyleborus fornicatus Eichhoff (Panama) and X. validus Eichhoff (New York and Pennsylvania).
Flood Frequency And The Assemblage Of Dispersal Types In Hanging Gardens Of The Narrows, Zion National Park, Utah, George P. Malanson, Jeanne Kay
Flood Frequency And The Assemblage Of Dispersal Types In Hanging Gardens Of The Narrows, Zion National Park, Utah, George P. Malanson, Jeanne Kay
Great Basin Naturalist
Hanging gardens of the Narrows, Zion National Park, Utah, are plant communities growing at permanent seeps on the canyon walls. The gardens are isolated from each other and from other plant communities by vertical expanses of sandstone. Gardens consist mostly of herbaceous species less than 1 m tall. Though not individually species-rich, the hanging gardens are diverse as a group, and very dissimilar.
This study considers two explanations of the heterogeneous distribution of species in hanging gardens. The assemblages of dispersal types in gardens of different spatial attributes and disturbance frequencies are examined. The GH statistic, a log likelihood …
Zonation Patterns In The Potholes Of Kalsow Prairie, Iowa, Jack D. Brotherson
Zonation Patterns In The Potholes Of Kalsow Prairie, Iowa, Jack D. Brotherson
Great Basin Naturalist
Kalsow Prairie, a mesic prairie remnant in central Iowa, was acquired by the state in 1949 and later established as a botanical reserve. This study concerns a complex of 14 potholes and adjacent drainage areas within the prairie. The potholes varied in depth and degree of fill and are thus useful in studies of plant succession. All 14 potholes exhibit zonation patterns. A total of 36 transects were taken in the various community zones. Canopy cover data were taken in every zone. The zones are ordinated into three-dimensional space as well as clustered. Interspecific association patterns are elucidated. A successional …
Plants Of Angel Island, Marin County, California, J. D. Ripley
Plants Of Angel Island, Marin County, California, J. D. Ripley
Great Basin Naturalist
The floristic composition of Angel Island, Marin County, California, is presented. The vascular flora consists of 416 native and naturalized plants, representing 252 genera and 73 families. Eighty species of ornamental plants persisting from cultivation, representing 64 genera and 39 families, are also identified. The nonvascular flora consists of 42 species of fungi, 7 species of green algae, 8 species of brown algae, and 41 species of red algae. The vascular flora occurs in seven plant communities and is composed mainly of the following plant types: forbs (69 percent), grasses (13 percent), shrubs (8 percent), and trees (4 percent). Approximately …
Additions To The Vascular Flora Of Teton County, Wyoming, Ronald L. Hartman, Robert W. Lichvar
Additions To The Vascular Flora Of Teton County, Wyoming, Ronald L. Hartman, Robert W. Lichvar
Great Basin Naturalist
An annotated list of 125 taxa new to the flora of Teton County is presented, increasing the number of known species to 1043.
Terrestrial Vertebrate Fauna Of The Kaiparowits Basin, N. Duane Atwood, Clyde L. Pritchett, Richard D. Porter, Benjamin W. Wood
Terrestrial Vertebrate Fauna Of The Kaiparowits Basin, N. Duane Atwood, Clyde L. Pritchett, Richard D. Porter, Benjamin W. Wood
Great Basin Naturalist
This report includes data collected during an investigation by Brigham Young University personnel from 1971 to 1976, as well as a literature review. The fauna of the Kaiparowits Basin is represented by 7 species of amphibians (1 salamander, 5 toads, and 1 tree frog), 29 species of reptiles (1 turtle, 16 lizards, and 12 snakes), 183 species of birds (plus 2 hypothetical), and 74 species of mammals. Geographic distribution of the various species within the basin are discussed. Birds are categorized according to their population and seasonal status. Avian habitat relationships are discussed, and extensions of range are reported for …
Spatiotemporal Variation In Phenology And Abundance Of Floral Resources On Shortgrass Prairie, V. J. Tepedino, N. L. Stanton
Spatiotemporal Variation In Phenology And Abundance Of Floral Resources On Shortgrass Prairie, V. J. Tepedino, N. L. Stanton
Great Basin Naturalist
Phenology and abundance of the floral resources used by bees and other flower-visiting insects were recorded weekly from permanent quadrats for two years on two shortgrass prairie sites in the Laramie Basin, Wyoming. Each site was composed of three distinct plant communities. Results suggest considerable spatiotemporal variability in floral resources. Specifically, most species at both sites showed the following temporal variation: (1) bloom times between one and two weeks earlier in the second year; (2) differences of approximately 1–2 weeks in bloom span between years; (3) substantial differences in abundance of flowers between years. Species blooming during the last half …
Dog Owners And Hydatid Disease In Sanpete County, Utah, Peter M. Schantz, Ferron L. Andersen
Dog Owners And Hydatid Disease In Sanpete County, Utah, Peter M. Schantz, Ferron L. Andersen
Great Basin Naturalist
A questionnaire survey was conducted in Sanpete County, Utah, to determine the knowledge of dog owners concerning hydatid disease and an identification of some basic sheep management practices there. The households surveyed included 21 (Group I) that had one or more dogs infected with Echinococcus granulosus tapeworms at more than one annual field clinic, and 19 others (Group II) that had one or more dogs infected when the study first began in 1971–72, but had not had any infected dogs identified at field clinics during subsequent years. The results showed that 92.5 percent of households knew the cause of the …
New Grass Distribution Records For Arizona, New Mexico, And Texas, Stephan L. Hatch
New Grass Distribution Records For Arizona, New Mexico, And Texas, Stephan L. Hatch
Great Basin Naturalist
New distribution records are given for seven grass species now found in Arizona, New Mexico, and Texas.
A Comparison Of Epiphytic Diatom Assemblages On Living And Dead Stems Of The Common Grass Phragmites Australis, Judith A. Grimes, Larry L. St. Clair, Samuel R. Rushforth
A Comparison Of Epiphytic Diatom Assemblages On Living And Dead Stems Of The Common Grass Phragmites Australis, Judith A. Grimes, Larry L. St. Clair, Samuel R. Rushforth
Great Basin Naturalist
Diatoms epiphytic on Phragmites australis (Cav.) Trin. ex Steaded stems were collected from a single clone at the southern end of Provo Bay, Utah Lake, Utah. Diatom populations from both living and dead stem sections were analyzed. Species diversity in each sample was high, indicating that the stems provide a relatively stable habitat for diatom epiphytes. Of the 23 genera found, only Gomphonema and Navicula showed significant trends toward stem preference. The diatoms in this study support the current view that Utah Lake is a slightly saline, eutrophic system.
A Self-Pollination Experiment In Pinus Edulis, Ronald M. Lanner
A Self-Pollination Experiment In Pinus Edulis, Ronald M. Lanner
Great Basin Naturalist
Controlled pollinations were performed on four pinyons (Pinus edulis Engelm.) to compare the results of selfing and outcrossing. Final cone size was the same under both treatments. There was no significant difference in number of seeds per cone. Filled-seed yields averaged 14.4 percent in selfings and 90.5 percent in outcrossings. Relative self-fertility averaged about 15 percent, a level comparable with that of other pine species studied.
The Successional Status Of Cupressus Arizonica, Albert J. Parker
The Successional Status Of Cupressus Arizonica, Albert J. Parker
Great Basin Naturalist
Several investigations (size-class analysis, age-determination inquiries, and germination tests) suggest that Cupressus arizonica of southeastern Arizona is a pioneer species. The tree requires disturbance to remove or reduce soil litter, which otherwise inhibits the reproduction of the species. Reduction of light intensity caused by canopy closure appears to be less important than litter accumulation in restricting C. arizonica reproduction. Following disturbance, successful establishment of seedlings may occur over an extended period (50 to 100 years), as litter gradually accumulates. The absence of C. arizonica seedlings in present populations suggest that fire suppression policies on federal lands where C. arizonica occurs …
Poisonous Plants Of Utah, Jack D. Brotherson, Lee A. Szyska, William E. Evenson
Poisonous Plants Of Utah, Jack D. Brotherson, Lee A. Szyska, William E. Evenson
Great Basin Naturalist
A list of the major livestock-poisoning plants has been compiled for the state of Utah. Two hundred fifteen taxa representing 36 families, 119 genera, and 209 species occur within the state. Forty-one percent are from two families, the Asteraceae and the Fabaceae. The remaining families of major importance are: Poaceae, Ranunculaceae, Solanaceae, Chenopodiaceae, Brassicaceae, Ascelpiadaceae, Liliaceae, and Euphorbiaceae. Sixty-nine percent of the genera occur with a single species. Thirty-three percent of the taxa are introduced to the state. Most of the plants are insect pollinated; 57 percent are herbaceous perennials.
Most livestock poisoning occurs during the spring. This is due …
Comparative Floral Biology Of Penstemon Eatonii And Penstemon Cyananthus In Central Utah: A Preliminary Study, Lucinda Bateman
Comparative Floral Biology Of Penstemon Eatonii And Penstemon Cyananthus In Central Utah: A Preliminary Study, Lucinda Bateman
Great Basin Naturalist
A comparison of the floral visitors of two closely related plant species, Penstemon cyananthus and P. eatonii suggests that flower shape and color may affect the number and type of pollinators, and the ability of the plant to set fruit. Penstemon cyananthus, which is most attractive to hymenopteran visitors, has a blue flower, large in diameter, that is positioned as a convenient "landing pad." Although many types of insects visit the flower, the transport of pollen directly to flowers of another individual of the same species is somewhat inefficient, since fruiting success is low (66.7 percent). The tubular red flowers …
Differential Habitat Utilization By The Sexes Of Mule Deer, Michael M. King, H. Duane Smith
Differential Habitat Utilization By The Sexes Of Mule Deer, Michael M. King, H. Duane Smith
Great Basin Naturalist
Habitat segregation trends have been observed and published for the sexes of mule deer (Odocoileus hemionus) based on elevation and slope exposure. Despite these brief descriptions, quantitative studies on habitat segregation by the sexes of mule deer are lacking. Results of research conducted in central Utah indicated no significant difference in elevation positions used by males, but did show significant difference in utilization of study sites based on slope exposure, relative percentage forb cover, and relative percentage hiding cover. Males were most common at sites characterized by low forb abundance and hiding cover, and on south-facing exposures. Females …
Temporal Activity Patterns Of Dipodomys Ordii Population, Clive D. Jorgensen, H. Duane Smith, James R. Garcia
Temporal Activity Patterns Of Dipodomys Ordii Population, Clive D. Jorgensen, H. Duane Smith, James R. Garcia
Great Basin Naturalist
Temporal activity patterns for Dipodomys ordii were generally bimodal during the summer, with the highest peak occurring during early predawn hours when conditions were optimum for water conservation. Removal of dominant members in the population resulted in a substantial shift in the activity pattern to increased activity during the evening hours.
New Records Of Western Trichoptera With Notes On Their Biology, Bernard G. Swegman, Leonard C. Ferrington Jr.
New Records Of Western Trichoptera With Notes On Their Biology, Bernard G. Swegman, Leonard C. Ferrington Jr.
Great Basin Naturalist
Western records for 27 species of Trichoptera are given; a majority of the records are from the Beartooth Mountains of northwestern Wyoming. In addition, examples of variation in the male genitilia of Limnephilus coloradensis (Banks) are figured and the female is described. Some comments regarding the larvae of Allomyia (Imania) are presented.
Observations On Seasonal Variation In Desert Arthropods In Central Nevada, Robert D. Pietruszka
Observations On Seasonal Variation In Desert Arthropods In Central Nevada, Robert D. Pietruszka
Great Basin Naturalist
Pitfall and Malaise trap collections from terrestrial arthropod populations in central Nevada were analyzed for four trapping periods during the 1978 growing season. Mites (Acarina) and ants (Formicidae) were the taxa represented by the largest numbers of individuals in pitfall trap collections throughout the season; Malaise collections were composed mainly of aerial taxa (largely Diptera and Hymenoptera). Peak arthropod abundance was recorded during mid-June. Collection diversities for both trapping methods were generally low due to the abundance of a few taxa. Evidence for spatial heterogeneity in arthropod populations was meager; temporal heterogeneity in these populations, however, was more apparent.