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Spatial Pattern And Interference In Piñon-Juniper Woodlands Of Northwest Colorado, Charles W. Welden, William L. Slauson, Richard T. Ward Dec 1990

Spatial Pattern And Interference In Piñon-Juniper Woodlands Of Northwest Colorado, Charles W. Welden, William L. Slauson, Richard T. Ward

Great Basin Naturalist

The local spatial arrangement of the coniferous trees Pinus edulis and Juniperus osteosperma was mapped in two woodland stands and measured in two shrub-dominated stands in the semiarid Piceance Basin of northwest Colorado. In the woodlands, small trees were often clumped, while medium and large trees were either randomly or uniformly dispersed. Significant regressions were obtained between a tree's basal area or canopy area and the area of its Dirichlet domain (the region closer to it than to any other tree). Both findings from the woodland stands accord with results obtained by other workers in other vegetation. Like earlier workers, …

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Emergence, Attack Densities, And Host Relationships For The Douglas-Fir Beetle (Dendroctonus Pseudotsugae Hopkins) In Northern Colorado, E. D. Lessard, J. M. Schmid Dec 1990

Emergence, Attack Densities, And Host Relationships For The Douglas-Fir Beetle (Dendroctonus Pseudotsugae Hopkins) In Northern Colorado, E. D. Lessard, J. M. Schmid

Great Basin Naturalist

Douglas-fir beetle-infested Douglas-fir trees were partially caged to determine the emergence period and beetle production. Beetles began emerging in April, but emergence peaked between 10 and 26 June. In 1987 and 1988 beetle emergence averaged 20 or more per sq. ft. of bark. Annual growth of the infested trees showed a decline prior to the beetle outbreak followed by an increase during the outbreak.

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Full Issue, Vol. 50 No. 4 Dec 1990

Full Issue, Vol. 50 No. 4

Great Basin Naturalist

No abstract provided.

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Front Matter, Vol. 50 No. 4 Dec 1990

Front Matter, Vol. 50 No. 4

Great Basin Naturalist

No abstract provided.

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Sprouting And Seedling Establishment In Plains Silver Sagebrush (Artemisia Cana Pursh. Ssp. Cana), C. L. Wambolt, T. P. Walton, R. S. White Oct 1990

Sprouting And Seedling Establishment In Plains Silver Sagebrush (Artemisia Cana Pursh. Ssp. Cana), C. L. Wambolt, T. P. Walton, R. S. White

Great Basin Naturalist

The importance and nature of vegetative reproduction was compared with seedling establishment in plains silver sagebrush (Artemisia cana Pursh. ssp. cana). Sixty-three percent of plants excavated originated from rhizomes. Sites that experienced habitat disturbance did not have a significantly different number of plants originating from vegetative reproduction than did undisturbed sites. Parent rhizomes were significantly older than taproots, which were significantly older than aboveground stems. Rhizome systems were spread 3.3 times that of plant height. Seventy-nine percent of rhizomatous daughter plants were 100 cm or less from parent plants. Up to 52 sprouts were found on one rhizome. …

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Dam-Site Selection By Beavers In An Eastern Oregon Basin, William C. Mccomb, James R. Sedell, Todd D. Buchholz Oct 1990

Dam-Site Selection By Beavers In An Eastern Oregon Basin, William C. Mccomb, James R. Sedell, Todd D. Buchholz

Great Basin Naturalist

We compared physical and vegetative habitat characteristics at 14 dam sites occupied by beaver (Castor Canadensis) with those at 41 random unoccupied reaches to identify features important to dam-site selection in the Long Creek basin, Grant County, Oregon. Stream reaches with dams were shallower and had a lower gradient than unoccupied reaches. Beaver did not build dams at sites with a rock substrate. Bank slopes at occupied reaches were not as steep as those at unoccupied reaches; and occupied stream reaches had greater tree canopy cover, especially of thinleaf alder (Alnus tenuifolia), than did unused reaches. …

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Microbiology And Water Chemistry Of Two Natural Springs Impacted By Grazing In South Central Nevada, Deborah A. Hall, Penny S. Amy Oct 1990

Microbiology And Water Chemistry Of Two Natural Springs Impacted By Grazing In South Central Nevada, Deborah A. Hall, Penny S. Amy

Great Basin Naturalist

No abstract provided.

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Full Issue, Vol. 50, No. 3 Oct 1990

Full Issue, Vol. 50, No. 3

Great Basin Naturalist

No abstract provided.

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Humpback Chub (Gila Cypha) In The Yampa And Green Rivers, Dinosaur National Monument, With Observations On Roundtail Chub (G. Robusta) And Other Sympatric Fishes, Catherine A. Karp, Harold M. Tyus Oct 1990

Humpback Chub (Gila Cypha) In The Yampa And Green Rivers, Dinosaur National Monument, With Observations On Roundtail Chub (G. Robusta) And Other Sympatric Fishes, Catherine A. Karp, Harold M. Tyus

Great Basin Naturalist

We evaluated distribution, habitat use, spawning, and species associations of the endangered humpback chub (Gila cypha) in the Yampa and Green rivers, Dinosaur National Monument, from 1986 to 1989. Adult and juvenile humpback chub were captured in high-gradient reaches of Yampa and Whirlpool canyons where they were rare (n = 133, < 1% of all fish captured). The fish was primarily captured in eddy habitats in association with 7 native and 12 nonnative fish species. Roundtail chub (G. robusta) were widely distributed in eddies, pools, runs, and riffles. Humpback chub (n = 39) and roundtail chub (n = 242) in reproductive condition were sympatric in eddy habitats during the 5–6-week period following highest spring runoff. River temperatures at this time …

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Small Mammal Records From Dolphin Island, The Great Salt Lake, And Other Localities In The Bonneville Basin, Utah, Kenneth L. Cramer, A. Lee Foote, Joseph A. Chapman Oct 1990

Small Mammal Records From Dolphin Island, The Great Salt Lake, And Other Localities In The Bonneville Basin, Utah, Kenneth L. Cramer, A. Lee Foote, Joseph A. Chapman

Great Basin Naturalist

No abstract provided.

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End Matter, Vol. 50 No. 3 Oct 1990

End Matter, Vol. 50 No. 3

Great Basin Naturalist

No abstract provided.

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Management Of Endangered Sonoran Topminnow At Bylas Springs, Arizona: Description, Critique, And Recommendations, Paul C. Marsh, W. L. Minckley Oct 1990

Management Of Endangered Sonoran Topminnow At Bylas Springs, Arizona: Description, Critique, And Recommendations, Paul C. Marsh, W. L. Minckley

Great Basin Naturalist

Efforts between 1982 and 1990 have failed to recover and secure three natural populations of endangered Sonoran topminnow (Poeciliopsis o. occidentalis) at Bylas Springs, Arizona. Flooding in the Gila River in 1977–78 allowed ingress by predatory mosquitofish (Gambusia affinis), and topminnows began to decline. Since that time (1) one stock has been replaced twice and is again nearly gone because of depredations by mosquitofish that resisted two eradication attempts; (2) topminnows at a second spring were extirpated through vegetation encroachment after fencing to protect the habitat from livestock; and (3) a third population was lost to …

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Birds Of A Shadscale (Artriplex Confertifolia) Habitat In East Central Nevada, Dean E. Medin Oct 1990

Birds Of A Shadscale (Artriplex Confertifolia) Habitat In East Central Nevada, Dean E. Medin

Great Basin Naturalist

No abstract provided.

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Bibliography Of Nevada And Utah Vegetation Description, P. S. Bourgeron, L. D. Engelking, J. S. Tuhy, J. D. Brotherson Oct 1990

Bibliography Of Nevada And Utah Vegetation Description, P. S. Bourgeron, L. D. Engelking, J. S. Tuhy, J. D. Brotherson

Great Basin Naturalist

Listed in alphabetical order by author are 934 references to literature of the native vegetation of Nevada and Utah. This updates and expands the 1967 bibliography of Christensen for Utah. A keyword-citation index is provided.

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Front Matter, Vol. 50 No. 3 Oct 1990

Front Matter, Vol. 50 No. 3

Great Basin Naturalist

No abstract provided.

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"Things As They Really Are…", Elder Neal A. Maxwell Oct 1990

"Things As They Really Are…", Elder Neal A. Maxwell

Issues in Religion and Psychotherapy

No abstract provided.

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A Road Map To Hope, Elder John K. Carmack Oct 1990

A Road Map To Hope, Elder John K. Carmack

Issues in Religion and Psychotherapy

No abstract provided.

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The Moving Target: Japanese Culture Reconsidered, Robert J. Smith Oct 1990

The Moving Target: Japanese Culture Reconsidered, Robert J. Smith

Comparative Civilizations Review

No abstract provided.

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Greeks And Romans: Paradigms Of The Past In Arendt And Heidegger, Barbara Cassin Oct 1990

Greeks And Romans: Paradigms Of The Past In Arendt And Heidegger, Barbara Cassin

Comparative Civilizations Review

No abstract provided.

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The Care Of The Self: Two Brief Essays, 2. From Foucault To Leites, Paolo Fabri Oct 1990

The Care Of The Self: Two Brief Essays, 2. From Foucault To Leites, Paolo Fabri

Comparative Civilizations Review

No abstract provided.

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Lehi And El Niño: A Method Of Migration, David L. Clark Jul 1990

Lehi And El Niño: A Method Of Migration, David L. Clark

BYU Studies

David L. Clark combines what historians know about the migration of Lehi and his family to the Promised Land (from Arabia to the New World) with historical climate and weather patterns and currents in the Indian and Pacific Oceans. He discusses why Lehi, and later Nephi, may have chosen a certain path and timing to get to the Promised Land.

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Naturalistic Assumptions And The Book Of Mormon, Gary F. Novak Jul 1990

Naturalistic Assumptions And The Book Of Mormon, Gary F. Novak

BYU Studies

Gary F. Novak tells of Leonard J. Arrington's claims in his study of the naturalistic terms of the Book of Mormon. This article subjects some of the ideas presents in that article to scrutiny. Novak does lilt his discussion to one aspect of Mormon history; the so-called environmental discussion of the Book of Mormon.

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Black-Tailed Prairie Dog Populations One Year After Treatment With Rodenticides, Anthony D. Apa, Daniel W. Uresk, Raymond L. Linder Jun 1990

Black-Tailed Prairie Dog Populations One Year After Treatment With Rodenticides, Anthony D. Apa, Daniel W. Uresk, Raymond L. Linder

Great Basin Naturalist

Three rodenticide treatments, zinc phosphide with prebait, strychnine with prebait, and strychnine without prebait, were applied to black-tailed prairie dog Cynomys ludovicianus colonies in west central South Dakota. Results were compared immediately posttreatment and for one year after application. Zinc phosphide was the most effective for reducing prairie dog numbers immediately. When burrow activity levels of prairie dogs were initially reduced by 45% with strychnine only, they returned to untreated levels within ten months. When initial reductions were 95% with zinc phosphide, however, the number of active burrows was still reduced 77% in September the following year. Strychnine with prebait …

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Fungi Associated With Soils Collected Beneath And Between Pinyon And Juniper Canopies In New Mexico, P. R. Fresquez Jun 1990

Fungi Associated With Soils Collected Beneath And Between Pinyon And Juniper Canopies In New Mexico, P. R. Fresquez

Great Basin Naturalist

The soil fungal community beneath pinyon (Pinus edulis Engelm.) and one-seeded juniper (Juniperus monosperma [Engelm.] Sar.) tree canopies is described and compared with fungi from adjacent interspace soils dominated by blue grama (Bouteloua gracilis [H. B. K.] Lag.). Significantly higher organic matter contents and fungal propagule levels were found in soils beneath pinyon and juniper trees than in interspace soils. Soils under pinyon and juniper trees contained similar chemical, physical, and biological properties and, consequently, many groups of fungi in common (64% of the species isolated were common to both). In contrast soil fungi in adjacent interspace …

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Front Matter, Vol. 50 No. 2 Jun 1990

Front Matter, Vol. 50 No. 2

Great Basin Naturalist

No abstract provided.

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Full Issue, Vol. 50 No. 2 Jun 1990

Full Issue, Vol. 50 No. 2

Great Basin Naturalist

No abstract provided.

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End Matter, Vol. 50 No. 2 Jun 1990

End Matter, Vol. 50 No. 2

Great Basin Naturalist

No abstract provided.

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Mayfly Growth And Population Density In Constant And Variable Temperature Regimes, Russell B. Rader, James V. Ward Jun 1990

Mayfly Growth And Population Density In Constant And Variable Temperature Regimes, Russell B. Rader, James V. Ward

Great Basin Naturalist

The thermal equilibrium hypothesis predicts that aquatic insect body size/fecundity and, consequently, population density and biomass will be maximized in geographic areas or along altitudinal gradients where the thermal regime is optimal with respect to growth and development. Seasonal growth analyses of three mayfly species,combined with detailed thermal descriptions were used to explore differences in body size and fecundity at three sites with similar elevations but different temperature regimes. Site 1 was located near the upper altitudinal distribution for each species, whereas sites 2 and 3 were located below a deep-release storage reservoir. The temperature pattern at site 1 had …

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Bats In Spotted Owl Pellets In Southern Arizona, Russell B. Duncan, Ronnie Sidner Jun 1990

Bats In Spotted Owl Pellets In Southern Arizona, Russell B. Duncan, Ronnie Sidner

Great Basin Naturalist

No abstract provided.

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Foliage Biomass And Cover Relationships Between Tree- And Shrub-Dominated Communities In Pinyon-Juniper Woodlands, R. J. Tausch, P. T. Tueller Jun 1990

Foliage Biomass And Cover Relationships Between Tree- And Shrub-Dominated Communities In Pinyon-Juniper Woodlands, R. J. Tausch, P. T. Tueller

Great Basin Naturalist

Woodlands dominated by singleleaf pinyon (Pinus monophylla Torr.and Frem.) and Utah (Juniperus osteosperma [Torr.] Little) cover extensive areas in the Great Basin and Southwest. Both species are aggressive and can nearly eliminate the previous shrub-dominated community. Successional pathways from shrub-dominated communities before tree establishment to the tree-dominated communities that follow are known only for a few specific sites. How site growing conditions affect successional patterns needs further study. We compared the relationship of foliage biomass and percentage of cover between paired shrub-dominated and tree-dominated plots over several sites. Sites studied are from different elevation and topographic conditions on …

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