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An Irvingtonian Species Of Brachylagus (Mammalia: Lagomorpha) From Porcupine Cave, Park County, Colorado, Colleen N. Ramos
An Irvingtonian Species Of Brachylagus (Mammalia: Lagomorpha) From Porcupine Cave, Park County, Colorado, Colleen N. Ramos
Great Basin Naturalist
Brachylagus is currently a monotypic genus of uncertain origins and known only from Holocene and late Rancholabrean. A new species of leporid is described from the early and middle Pleistocene (Irvingtonian) deposits of Porcupine Cave, Park County, Colorado. Stratified deposits of the Pit and the Velvet Room, 2 localities within Porcupine Cave, have been dated biochronologically and paleomagnetically from the middle Irvingtonian and early to middle Irvingtonian, respectively. Brachylagus coloradoensis sp. nov., is characterized by its conserved p3 enamel patterns which are intermediate between B. idahoensis and Hypolagus, and its size which is slightly larger than that of B. idahoensis …
Late Pleistocene Microtine Rodents From Snake Creek Burial Cave, White Pine County, Nevada, Christopher J. Bell, Jim I. Mead
Late Pleistocene Microtine Rodents From Snake Creek Burial Cave, White Pine County, Nevada, Christopher J. Bell, Jim I. Mead
Great Basin Naturalist
A total of 395 microtine rodent specimens recovered from Snake Creek Burial Cave (SCBC) are referred to Microtus sp. and Lemmiscus curtatus. Radiocarbon and Uranium series dates indicated an age for these fossils of between 9460 ± 160 yr. B.P. and 15,100 ± 700 yr. B.P. The sample of lower first molars of Lemmiscus includes 4-, 5-, and 6-closed triangle morphotypes. Earlier reports of the 4-closed triangle morphotype are from Irvingtonian deposits in Colorado, Nevada, and New Mexico and from early Rancholabrean deposits in Washington. The morphotype is not known in living populations of Lemmiscus. SCBC specimens constitute …
Lagomorphs And The Dispersal Of Seeds Into Communities Dominated By Exotic Annual Weeds, Eugene W. Schupp, Hoyt J. Heaton, José M. Gomez
Lagomorphs And The Dispersal Of Seeds Into Communities Dominated By Exotic Annual Weeds, Eugene W. Schupp, Hoyt J. Heaton, José M. Gomez
Great Basin Naturalist
Large areas of western rangeland are presently dominated by alien annual weeds such as Bromus tectorum (cheatgrass). These communities resist succession to perennial communities primarily because the annuals are competitively superior to establishing perennial seedlings and they promote fires that favor weeds over perennials. Succession may be further slowed, however, by low rates of seed dispersal into annual grasslands. We investigated the role of lagomorphs (Sylvilagus nuttalli, Nuttall's cottontail; S. audubonii, desert cottontail; and Lepus californicus, black-tailed jackrabbit) in seed dispersal across an ecotone between an open juniper woodland and an annual grassland. We collected pellets …
Intermountain Movement By Mexican Spotted Owls (Strix Occidentalis Lucida), R. J. Gutiérrez, Mark E. Seamans, M. Zachariah Peery
Intermountain Movement By Mexican Spotted Owls (Strix Occidentalis Lucida), R. J. Gutiérrez, Mark E. Seamans, M. Zachariah Peery
Great Basin Naturalist
No abstract provided.
Alpine Vascular Flora Of The Tushar Mountains, Utah, Alan C. Taye
Alpine Vascular Flora Of The Tushar Mountains, Utah, Alan C. Taye
Great Basin Naturalist
The Tushar Mountains of southwestern Utah rise to a maximum elevation of 3709 m, with timberline and krummholz reaching maximum elevations of 3438 m and 3566 m, respectively. Voucher specimens were collected from the alpine region during eight field seasons to inventory this largely unknown alpine flora. Listed are 171 vascular plant species from 102 genera and 34 families that occur in eight types of plant communities within an alpine area of about 19.3 km2, the seven largest families are Asteraceae (29 species), Poacea (20), Brassicaceae (13), Rosaceae (12), Cyperaceae (11), Caryophyllaceae (10), and Fabaceae (8). Thirteen species …
Status And Distribution Of The Laridae In Wyoming Through 1986, Scott L. Findholt
Status And Distribution Of The Laridae In Wyoming Through 1986, Scott L. Findholt
Great Basin Naturalist
To date, 17 species of Laridae have been reported in Wyoming. Six of these species have know breeding populations in the state: the Ring-billed Gull (Larus delawarensis), California Gull (Larus californicus), Herring Gull (Larus argentatus), Caspian Tern (Sterna caspia), Forster's Tern (Sterna forsteri), and Black Tern (Chlidonias niger). Of these species, the California Gull is the most abundant and widespread. In 1984 approximately 7300 nests existed in Wyoming at six breeding locations consisting of 10 different colonies. In contrast, only small breeding populations have been discovered for the …
Nesting And Summer Habitat Use By Translocated Sage Grouse (Centrocercus Urophasianus) In Central Idaho, David D. Musil, Kerry P. Reese, John W. Connelly
Nesting And Summer Habitat Use By Translocated Sage Grouse (Centrocercus Urophasianus) In Central Idaho, David D. Musil, Kerry P. Reese, John W. Connelly
Great Basin Naturalist
We translocated 196 Sage Grouse (Centrocercus urophasianus into Sawtooth Valley, Idaho, during March–April 1986–87 to augment a small resident population. Forty-four grouse equipped with radio transmitters were monitored through spring and summer. Nest sites (n = 6) had greater (P = .032) horizontal cover than did independent random plots (n = 7). During summer, grouse used sites (n = 50) with taller live and dead shrub heights, greater shrub canopy cover, and more ground litter (P < .009) than were found on dependent random plots (n = 50) 50–300 m from use sites. Distance to edge and mountain sagebrush (Artemisia tridentata vaseyana …
Ecological Review Of Black-Tailed Prairie Dogs And Associated Species In Western South Dakota, Jon C. Sharps, Daniel W. Uresk
Ecological Review Of Black-Tailed Prairie Dogs And Associated Species In Western South Dakota, Jon C. Sharps, Daniel W. Uresk
Great Basin Naturalist
Black-tailed prairie dogs (Cynomys ludovicianus) once occupied extensive areas throughout the Great Plains. In recent years massive control programs have been initiated to reduce prairie dog populations, primarily to benefit the livestock grazing industry. Currently in western South Dakota most prairie dogs are found on public lands. Control programs using toxicants for prairie dogs have been found to be economically unfeasible when not combined with reductions in livestock grazing. Control programs also have negatively impacted some nontarget species of birds and small mammals. Livestock grazing is directly related to prairie dog densities. Prairie dog and livestock grazing activities …
Canids From The Late Pleistocene Of Utah, Michael E. Nelson, James H. Madsen Jr.
Canids From The Late Pleistocene Of Utah, Michael E. Nelson, James H. Madsen Jr.
Great Basin Naturalist
Two canids, Vulpes vulpes and Canis lupus, are recorded from shoreline deposits of Lake Bonneville in north central Utah. Both species are new records in the Pleistocene sediments of Utah and add to our scarce knowledge of the large carnivores that inhabited the shoreline environments of Lake Bonneville.
Snakes Of Western Chihuahua, Wilmer W. Tanner
Snakes Of Western Chihuahua, Wilmer W. Tanner
Great Basin Naturalist
This is a report on the snakes of western Chihuahua that were taken at intervals from 1956 to 1972. At no time did we attempt to collect east of Highway 45, rather expending our time in the foothills, valleys, and desert ranges east of the mountains and in the highlands of the Sierra Madre Occidental. Reference is made to reports on the geological and ecological aspects of the area as a whole, but without a major attempt to duplicate previous studies. A brief gazetteer and a map are included as guides. To provide orientation to the area traversed by the …
Nymphs Of North American Perlodinae Genera (Plecoptera: Perlodidae), Kenneth W. Stewart, Bill P. Stark
Nymphs Of North American Perlodinae Genera (Plecoptera: Perlodidae), Kenneth W. Stewart, Bill P. Stark
Great Basin Naturalist
Nymphs of the type or other representative species of the 22 North American Perlodinae genera are comparatively described and illustrated for the first time. The first complete generic key for the subfamily incorporates recent nymph discoveries and revisions in classification. References to all previous nymph descriptions and illustrations and major life cycle and food habits studies are given for the 53 North American species in the subfamily, and a listing of species and their current distributions by states and provinces is provided for each genus. The previously unknown nymph of Chernokrilus misnomus is described and illustrated.
Effects Of 2,4-D On A Populus Tremuloides Community In The Western United States—22 Years After Treatment, Dale L. Bartos, James E. Lester
Effects Of 2,4-D On A Populus Tremuloides Community In The Western United States—22 Years After Treatment, Dale L. Bartos, James E. Lester
Great Basin Naturalist
Quaking aspen (Populus tremuloides Michx.) stands were accidentally sprayed with 2,4-D in a sagebrush control program in western Wyoming in 1958. We visited the site during the summer of 1981 to evaluate the long-term effect on the aspen trees and the associated vegetation. Initially, some observers believed that the aspen had been "destroyed." Subsequent data indicate just the opposite—aspen stocking appeared to have been improved by the treatment. On two of the sampled clones, 22 years after spraying, there were approximately 17,000 more suckers/ha on the sprayed than on the unsprayed plots. These are adequate numbers to restock the …
Bird Distributional And Breeding Records For Southeastern Idaho, Utah, And Adjacent Regions, Clayton M. White, Herbert H. Frost, Dennis L. Shirley, G. Merrill Webb, Richard D. Porter
Bird Distributional And Breeding Records For Southeastern Idaho, Utah, And Adjacent Regions, Clayton M. White, Herbert H. Frost, Dennis L. Shirley, G. Merrill Webb, Richard D. Porter
Great Basin Naturalist
New distributional records or the status for 33 species of birds that have occurred within Utah, adjacent southeastern portions of Idaho, or along the border of states surrounding Utah are reviewed. Four species, the Cattle Egret (Bubulcus ibis), Common Moorhen (Gallinula chloropus), Great-tailed Grackle (Quiscalus mexicanus), and Common Grackle (Quiscalus quiscula), represent new Utah breeding records established within the past decade, and they are commented upon. One other, the Black-tailed Gnatcatcher (Polioptila melanura), may be breeding in Utah. The Mockingbird (Mimus polyglottos) may likewise be breeding in southeastern …
Phalacropsis Dispar (Coleoptera: Phalacridae), An Element In The Natural Control Of Native Pine Stem Rust Fungi In The Western United States, David L. Nelson
Phalacropsis Dispar (Coleoptera: Phalacridae), An Element In The Natural Control Of Native Pine Stem Rust Fungi In The Western United States, David L. Nelson
Great Basin Naturalist
Larvae of the phalacrid beetle Phalacropsis dispar (LeConte) consumed aeciospores and the underlying sporogenous mycelium, thereby destroying the aecia of all native western pine stem rust fungi studied. Aecia of the introduced white pine blister rust fungus (Cronartium ribicola) were not found to be infested by the beetle. A close, if not obligate, biosis of the beetle apparently exists with the native rust fungi, and their geographic distributions closely coincide. Laboratory tests and field observations indicate that the beetle completes its life cycle in 30 to 40 days and apparently overwinters as an adult. Quantitative data on aeciospore …
Late Pleistocene Vertebrates Of The Silver Creek Local Fauna From North Central Utah, Wade E. Miller
Late Pleistocene Vertebrates Of The Silver Creek Local Fauna From North Central Utah, Wade E. Miller
Great Basin Naturalist
Presumed paludal and alluvial deposits in a small mountain basin in north central Utah have yielded the first terrestrial Pleistocene fauna from the state. Twenty-five mammalian and four nonmammalian species are present, most of which have not previously been reported as fossils from Utah. At 6,400 feet the elevation of this site is much too high to have been part of the Lake Bonneville deposition. Three mammals, Ovis, Symbos, and Bootherium, not existing in the present fauna, have been identified in the northern part of the state. They probably did not reach this area until later in …
A Revision Of Eriogonum (Polygonaceae) Subgenus Pterogonum, William J. Hess, James L. Reveal
A Revision Of Eriogonum (Polygonaceae) Subgenus Pterogonum, William J. Hess, James L. Reveal
Great Basin Naturalist
This revision discusses the 10 species of Eriogonum assigned to the subgenus Pterogonum. Six of the species are essentially restricted to northern Mexico; two additional species, E. hemipterum and E. nealleyi, are found primarily in Texas; and the remaining two, E. hieracifolium and E. alatum, are the most widespread species of the subgenus being found mainly in the United States and just barely entering Mexico. The subgenus is characterized by the broad, often winged or ribbed achenes, and the generally erect habit of the stems of these perennial herbs. Three new species, E. fimbriatum, E. viscanum, and E. clivosum, are …
Evolution Of The Sceloporine Lizards (Iguanidae), Kenneth R. Larsen, Wilmer W. Tanner
Evolution Of The Sceloporine Lizards (Iguanidae), Kenneth R. Larsen, Wilmer W. Tanner
Great Basin Naturalist
Phylogenetic relationships among Sceloporine genera are briefly discussed. Species relationships within the genus Sceloporus are analyzed, and evolutionary lines of descent are proposed. The genus Sceloporus is composed of three monophyletic groups: Group I, the most primitive, probably developed from Sator-like ancestral stock in Miocene times. This group speciated from stock similar to Sceloporus gadoviae in southern Mexico to S. merriami in the North and contains 7 species in 3 species groups. We propose that these species be included in the genus Lysoptychus Cope. Group II arose from Group I and evolved from centrally located Sceloporus pictus in all …
A Survey Of Nesting Hawks, Eagles, Falcons, And Owls In Curlew Valley, Utah, Joseph B. Platt
A Survey Of Nesting Hawks, Eagles, Falcons, And Owls In Curlew Valley, Utah, Joseph B. Platt
Great Basin Naturalist
During the summer of 1969 a survey involving 45 nesting nocturnal and diurnal birds of prey was made. Prey items, nest site selections, and productivity for great horned, long-eared, burrowing and short-eared owls, golden eagle, prairie falcon, kestrel, harrier and ferruginous, red-tailed and Swainson's hawks were determined. The turkey vulture, accipiter hawks, barn and screech owls were also recorded. The total raptor impact on the environment was determined to be slight, whereas the limits placed on the nesting species are considered substantial. It was noted that immature eagles were in the valley and, because they did not require a nest …
Revision Of The Hedysarum Boreale Complex, Terry E. Northstrom, Stanley L. Welsh
Revision Of The Hedysarum Boreale Complex, Terry E. Northstrom, Stanley L. Welsh
Great Basin Naturalist
No abstract provided.
The Ecology Of The Western Spotted Frog, Rana Pretiosa Pretiosa Baird And Girard, A Life History Study, Ronald L. Morris, Wilmer W. Tanner
The Ecology Of The Western Spotted Frog, Rana Pretiosa Pretiosa Baird And Girard, A Life History Study, Ronald L. Morris, Wilmer W. Tanner
Great Basin Naturalist
No abstract provided.
D Elden Beck (1906–1967), Vasco M. Tanner
D Elden Beck (1906–1967), Vasco M. Tanner
Great Basin Naturalist
No abstract provided.
A Study Of The Aspectional Variations Of Siphonaptera Associated With The Nests Of The Thomas Wood Rat Neotoma Lepida Lepida Thomas, J. Franklin Howell
A Study Of The Aspectional Variations Of Siphonaptera Associated With The Nests Of The Thomas Wood Rat Neotoma Lepida Lepida Thomas, J. Franklin Howell
Great Basin Naturalist
No abstract provided.