Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Brigham Young University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 8371 - 8400 of 10987

Full-Text Articles in Entire DC Network

The Effect Of Flooding On Northern Bobwhites, Roger D. Applegate, Christopher K. Williams, R. Scott Lutz May 2002

The Effect Of Flooding On Northern Bobwhites, Roger D. Applegate, Christopher K. Williams, R. Scott Lutz

Western North American Naturalist

No abstract provided.

Go to article

Flood Flows And Population Dynamics Of Arizona Sycamore (Platanus Wrightii), Juliet C. Stromberg May 2002

Flood Flows And Population Dynamics Of Arizona Sycamore (Platanus Wrightii), Juliet C. Stromberg

Western North American Naturalist

Platanus wrightii is a pioneer tree species of warm-temperate riparian deciduous forests in southwestern United States and northern Mexico. Dendrochronological analysis of populations in central and southern Arizona indicated that P. wrightii seedlings establish episodically. Long intervals (10–40 years) elapsed with no apparent establishment. Seedling establishment years were positively associated with winter flood size and annual flow rate, and weakly negatively associated with summer flood size. Large floods sometimes preceded multi-year establishment waves. During the past 2 decades an abundance of winter floods and very wet springs has allowed frequent establishment of P. wrightii. For example, plants established at many …

Go to article

New Records And Range Extensions Of Species Of Dipogon (Hymenoptera, Pompilidae) In Colorado, Howard E. Evans, David A. Leatherman May 2002

New Records And Range Extensions Of Species Of Dipogon (Hymenoptera, Pompilidae) In Colorado, Howard E. Evans, David A. Leatherman

Western North American Naturalist

Four species of Dipogon are recorded from Colorado for the first time. These are hurdi Evans, pulchripennis (Cresson), graenicheri Banks, and brevis (Cresson). All are inhabitants of wooded areas and are believed to nest in cavities in trees. Notes are presented on habitat and prey of these 4 species and of the recently described species kiowa Evans.

Go to article

Movements Of A Bullsnake (Pituophis Catenifer) Following Predation Of A Radio-Collared Northern Pocket Gopher (Thomomys Talpoides), Ray T. Sterner, Brett E. Petersen, Stephen A. Shumake, Stanley E. Gaddis, Jean B. Bourassa, Todd A. Felix, Geraldine R. Mccann, Kenneth A. Crane, Abbe D. Ames May 2002

Movements Of A Bullsnake (Pituophis Catenifer) Following Predation Of A Radio-Collared Northern Pocket Gopher (Thomomys Talpoides), Ray T. Sterner, Brett E. Petersen, Stephen A. Shumake, Stanley E. Gaddis, Jean B. Bourassa, Todd A. Felix, Geraldine R. Mccann, Kenneth A. Crane, Abbe D. Ames

Western North American Naturalist

No abstract provided.

Go to article

Gastrointestinal Helminths Of The Blackneck Garter Snake, Thamnophis Cyrtopsis(Colubridae), Stephen R. Goldberg, Charles R. Bursey May 2002

Gastrointestinal Helminths Of The Blackneck Garter Snake, Thamnophis Cyrtopsis(Colubridae), Stephen R. Goldberg, Charles R. Bursey

Western North American Naturalist

No abstract provided.

Go to article

Osprey Diet Along The Eastern Side Of The Gulf Of California, Mexico, Jean-Luc E. Cartron, Manuel C. Molles Jr. May 2002

Osprey Diet Along The Eastern Side Of The Gulf Of California, Mexico, Jean-Luc E. Cartron, Manuel C. Molles Jr.

Western North American Naturalist

No abstract provided.

Go to article

The World Of The Hummingbird By Robert Burton, Clayton M. White May 2002

The World Of The Hummingbird By Robert Burton, Clayton M. White

Western North American Naturalist

No abstract provided.

Go to article

Bird Hand Book Photos By Victor Schrager, Text By A. S. Byatt, Clayton M. White May 2002

Bird Hand Book Photos By Victor Schrager, Text By A. S. Byatt, Clayton M. White

Western North American Naturalist

No abstract provided.

Go to article

Full Issue, Vol. 62 No. 2 May 2002

Full Issue, Vol. 62 No. 2

Western North American Naturalist

No abstract provided.

Go to article

Does The Presence Of Wyethia Mollis Affect Growth Of Pinus Jeffreyi Seedlings?, G. M. Riegel, T. J. Svejcar, M. D. Busse May 2002

Does The Presence Of Wyethia Mollis Affect Growth Of Pinus Jeffreyi Seedlings?, G. M. Riegel, T. J. Svejcar, M. D. Busse

Western North American Naturalist

Regeneration of Pinus jeffreyi in the Sierra Nevada is often limited on sites dominated by Wyethia mollis. Allelopathic chemicals and competition for soil moisture have been suggested as possible mechanisms for limiting regeneration. We tested the hypothesis that soil chemical and microbial properties from sites in different stages of succession influence seedling growth of Pinus jeffreyi. Soil was collected from an early-seral site dominated by Wyethia mollis, a mid-seral site dominated by the shrubs Arctostaphylos patula, Ceanothus prostratus, C. velutinus, and Purshia tridentata, and a late-seral site dominated by mature Pinus. These sites were compared for …

Go to article

Do Jaguars (Panthera Onca) Depend On Large Prey?, Carlos A. López González, Brian J. Miller May 2002

Do Jaguars (Panthera Onca) Depend On Large Prey?, Carlos A. López González, Brian J. Miller

Western North American Naturalist

The jaguar (Panthera onca) has been classified as an opportunistic hunter that takes as many as 85 prey species, according to availability. In this study we analyzed jaguar food habits throughout its range to quantify the importance of small, medium, and large prey in the diet. Because peccaries (Tayassu) are present in most studies, we also tested their importance in relation to other prey items. We conclude that jaguars are equally using medium- and large-size prey, with a trend toward use of larger prey as distance increases from the equator. There was no significant difference between …

Go to article

Movement, Distribution, And Predation: Lepidomeda Vittata And Nonnative Salmonids In Eastern Arizona, Michael G. Sweetser, Scott D. Bryan, Anthony T. Robinson May 2002

Movement, Distribution, And Predation: Lepidomeda Vittata And Nonnative Salmonids In Eastern Arizona, Michael G. Sweetser, Scott D. Bryan, Anthony T. Robinson

Western North American Naturalist

Nonnative rainbow trout (Oncorhynchus mykiss) are stocked into several reservoirs in the range of federally threatened Little Colorado spinedace (Lepidomeda vittata), and so have the opportunity to negatively impact Little Colorado spinedace populations. We examined rainbow trout escapement from Nelson Reservior into Nutrioso Creek, critical habitat for L. vittata. We also examined movements of L. vittata and incidence of predation by rainbow trout on L. vittata. We detected no movement of rainbow trout out of Nelson Reservoir over 4 years of study. Lepidomeda vittata marked in 3 streams did not move much; but sample …

Go to article

Occurrence Of Corophium Spinicorne Stimpson, 1857 (Amphipoda: Corophiidae) In Idaho, Usa, Gary T. Lester, William H. Clark May 2002

Occurrence Of Corophium Spinicorne Stimpson, 1857 (Amphipoda: Corophiidae) In Idaho, Usa, Gary T. Lester, William H. Clark

Western North American Naturalist

No abstract provided.

Go to article

Comparison Of Nitrogen Isotope Ratios In Feathers From Seven Species Of Colorado Breeding Birds, Sujay S. Kaushal, John J. Walsh May 2002

Comparison Of Nitrogen Isotope Ratios In Feathers From Seven Species Of Colorado Breeding Birds, Sujay S. Kaushal, John J. Walsh

Western North American Naturalist

No abstract provided.

Go to article

Herpetofauna Of The Southern Snake Range Of Nevada And Surrounding Valleys, Kirk Setser, Jesse M. Meik, Daniel G. Mulcahy May 2002

Herpetofauna Of The Southern Snake Range Of Nevada And Surrounding Valleys, Kirk Setser, Jesse M. Meik, Daniel G. Mulcahy

Western North American Naturalist

No abstract provided.

Go to article

Assessment Of Cryptobiotic Crust Recovery, Robert C. Rychert May 2002

Assessment Of Cryptobiotic Crust Recovery, Robert C. Rychert

Western North American Naturalist

Chlorophyll a and b analyses of cryptobiotic crusts from burned and unburned sites on the Snake River plain provided an estimate of crust recovery. In less than 3 years, chlorophyll a levels were approximately 50% of the unburned reference site. Chlorophyll a/b ratios indicated that the biotic composition of the recovering cryptobiotic crust consisted largely of eukaryotic algae and bryophytes.

Go to article

Dealing With Fear And Depression In A 21st-Century Context, Carrie Maxwell Wrigley Apr 2002

Dealing With Fear And Depression In A 21st-Century Context, Carrie Maxwell Wrigley

Issues in Religion and Psychotherapy

Therapy in the 21st century cannot be guided soley by attention to intra-psychic or intra-familial factors. As the surrounding social and cultural environment continues to become more unstable, threatening, and dangerous, fear and depression become increasingly common, reality-based responses. These reponses are not a surprise to those acquainted with ancient and modern scriptures, which predict times of unprecedented trouble with accompanying widespread terror and despair; and which also identifies an alternative, more healthful response to the context of our current social enviroment. Finally, it articulates what AMCAP and its individual members can do to ""public peace"" in these times of …

Go to article

World Civlization Identified With Five Epochs Of History, William Mcgaughey Apr 2002

World Civlization Identified With Five Epochs Of History, William Mcgaughey

Comparative Civilizations Review

No abstract provided.

Go to article

Robert Wright Nonzero: The Logic Of Human Destiny, John J. Reiuly Apr 2002

Robert Wright Nonzero: The Logic Of Human Destiny, John J. Reiuly

Comparative Civilizations Review

No abstract provided.

Go to article

Effect Of Soil Microtopography On Seed Bank Distribution In The Shrub-Steppe, Jere A. Boudell, Steven O. Link, Jeffrey R. Johansen Feb 2002

Effect Of Soil Microtopography On Seed Bank Distribution In The Shrub-Steppe, Jere A. Boudell, Steven O. Link, Jeffrey R. Johansen

Western North American Naturalist

The relationship between soil surface cryptogamic crusts and seed banks was investigated in the shrubsteppe in the Lower Columbia Basin. Seventy-four percent of the seeds in a disturbed bunchgrass community were found in crevices bordering cryptogamic crust polygons. In a sagebrush/bunchgrass community, 89% of the seeds were found in crevices. In a disturbed bunchgrass community, Bromus tectorum seeds were found in both the seed bank and aboveground vegetation communities. Bromus tectorum seeds were located in the seed bank of a sagebrush/bunchgrass community, although it had a minor presence in the aboveground community. Seeds of Artemisia tridentata Nutt. were not found …

Go to article

Trichoptera And Other Macroinvertebrates In Springs Of The Great Basin: Species Composition, Richness, And Distribution, Marilyn J. Myers, Vincent H. Resh Feb 2002

Trichoptera And Other Macroinvertebrates In Springs Of The Great Basin: Species Composition, Richness, And Distribution, Marilyn J. Myers, Vincent H. Resh

Western North American Naturalist

Detailed surveys of aquatic invertebrates in 28 springs along the western border of the Great Basin were made using pan traps, emergence traps, black lights, and benthic sampling devices from 1994 to 1998. Although all macroinvertebrate groups were collected, caddisflies (Insecta: Trichoptera) were sampled most intensively. Fifty-eight species of caddisflies were collected from the 28 springs, with up to 18 species from a single spring. Although several springs had very similar physicochemical characteristics, none had identical trichopteran species composition. Using Wards minimum variance clustering technique, and with all macroinvertebrates identified to the lowest possible level, we found 3 taxa assemblages. …

Go to article

Three Naturally Occurring Penstemon Hybrids, Paul Wilson, Michael Valenzuela Feb 2002

Three Naturally Occurring Penstemon Hybrids, Paul Wilson, Michael Valenzuela

Western North American Naturalist

Three wild Penstemon hybrids are documented herein: Penstemon clevelandii × spectabilis, P. centranthifolius × spectabilis, and P. centranthifolius × eatonii. Each putative hybrid was compared to its respective parental species using manifold floral and vegetative characters for which the parents differed. For each hybrid hypothesis, characters were counted as being intermediate or not intermediate. There were significantly more intermediate characters in all 3 cases (one-sided sign tests, P < 0.05). These Penstemon species evidently do hybridize naturally, and for nearly all characters the hybrids are consistent with the view that the parents differ largely by additive genetic effects.

Go to article

Ecological Genetics And The Translocation Of Native Fishes: Emerging Experimental Approaches, Craig A. Stockwell, Paul L. Leberg Feb 2002

Ecological Genetics And The Translocation Of Native Fishes: Emerging Experimental Approaches, Craig A. Stockwell, Paul L. Leberg

Western North American Naturalist

Conservation biologists often use translocations to augment small populations, establish "refuge" populations, or reestablish populations into historic habitat. For reasons that are poorly understood, translocations often fail. Further, translocations have both short- and long-term consequences for the evolutionary ecology of the targeted taxa. Unfortunately, most information on translocations has been derived from descriptive studies. Recent experimental approaches have provided new data to address a variety of topics associated with translocations, including inbreeding, outbreeding, the relationship between heterozygosity and fitness, and rapid evolution in populations established by translocation. We focus on genetic and ecological aspects of translocations but recognize that contributions …

Go to article

Fertile Island Development Around Perennial Shrubs Across A Mojave Desert Chronosequence, John D. Bolling, Lawrence R. Walker Feb 2002

Fertile Island Development Around Perennial Shrubs Across A Mojave Desert Chronosequence, John D. Bolling, Lawrence R. Walker

Western North American Naturalist

Spatial heterogeneity has been examined only recently as a factor in studies of ecosystem processes. The effect of this factor on desert organisms is exemplified in the "fertile island" a concentration of essential soil nutrients under perennial shrubs. In this study we examined fertile island patterns in undisturbed desert areas and on abandoned roadways to see at what rate and magnitude these fertile patches reappeared after disturbance. Small-scale examination of patterns of soil P, organic matter, moisture, and bulk density showed that soils beneath Larrea tridentata (DC.) Cov. shrubs on the roads lacked the tight circular gradient in these variables …

Go to article

Observations Of Swarming By Bats And Band Recoveries In Colorado, Kirk W. Navo, Susanna Goad Henry, Thomas E. Ingersoll Feb 2002

Observations Of Swarming By Bats And Band Recoveries In Colorado, Kirk W. Navo, Susanna Goad Henry, Thomas E. Ingersoll

Western North American Naturalist

No abstract provided.

Go to article

Nest-Site Characteristics Of Burrowing Owls (Athene Cunicularia) In The Snake River Birds Of Prey National Conservation Area, Idaho, And Application To Artificial Burrow Installation, James R. Belthoff, R. Andrew King Feb 2002

Nest-Site Characteristics Of Burrowing Owls (Athene Cunicularia) In The Snake River Birds Of Prey National Conservation Area, Idaho, And Application To Artificial Burrow Installation, James R. Belthoff, R. Andrew King

Western North American Naturalist

Burrowing Owl (Athene cunicularia) populations are declining in many portions of their range, and research and management efforts into stemming declines are underway. One tool with promise is the artificial burrow, which can supplement nesting opportunities and play a role in research, mitigation, translocation, and reintroduction studies. However, few studies directly assess important burrow and surrounding topographic features upon which owls choose sites and then construct and install artificial burrows accordingly. In this study we (1) measure physical, vegetative, and topographic characteristics of Burrowing Owl nest sites in the Snake River Birds of Prey National Conservation Area (SRBPNCA); …

Go to article

Invisible Invasion: Potential Contamination Of Yellowstone Hot Springs By Human Activity, Robert F. Lindstrom, Robert F. Ramaley, Richard L. Weiss Bizzoco Feb 2002

Invisible Invasion: Potential Contamination Of Yellowstone Hot Springs By Human Activity, Robert F. Lindstrom, Robert F. Ramaley, Richard L. Weiss Bizzoco

Western North American Naturalist

This report establishes a baseline inventory of microorganisms in acidic hot springs of Yellowstone National Park (YNP). The analysis is based on observations carried out over the past 25 years using light microscopy, DNA staining, and electron microscopy of environmental samples. The inventory, while incomplete in that not all organisms have been cultured or examined using genetic approaches, represents a study of several solfatara (acid sulfate) geyser basins in YNP. We found that the types of microorganisms in flowing springs had changed over time. In contrast, no such changes occurred in mixing pools. We solicited opinions of prominent YNP microbiologists …

Go to article

Benthos Recovery After An Episodic Sediment Release Into A Colorado Rocky Mountain River, Robert E. Zuellig, Boris C. Kondratieff, Howard A. Rhodes Feb 2002

Benthos Recovery After An Episodic Sediment Release Into A Colorado Rocky Mountain River, Robert E. Zuellig, Boris C. Kondratieff, Howard A. Rhodes

Western North American Naturalist

During late September 1996, approximately 7000 m3 of clay- to gravel-sized sediment was flushed from Halligan Reservoir, Larimer County, Colorado, into the North Fork Cache la Poudre River during dam inspections. Approximately 9.6 km of this river was partially or completely affected by this episodic sediment release. Pools up to 3.2 km downstream from the dam lost 50% of their volume. Hess samples taken from October 1996 to September 1997, 100 m downstream from the dam (site 1) and 3.2 km downstream (site 2), revealed effects of sediment on recovery patterns of benthic communities. A 2-way ANOVA was used …

Go to article

Noteworthy Record Of The Kit Fox (Mammalia: Canidae: Vulpes Velos Macrotis) In Vizcaino Desert, Baja California Sur, México, Sergio Ticul Alvarez-Castañeda Feb 2002

Noteworthy Record Of The Kit Fox (Mammalia: Canidae: Vulpes Velos Macrotis) In Vizcaino Desert, Baja California Sur, México, Sergio Ticul Alvarez-Castañeda

Western North American Naturalist

No abstract provided.

Go to article

Status Of The Preston White River Springfish (Crenichthys Baileyi Albivallis), G. Gary Scoppettone, Peter H. Rissler Feb 2002

Status Of The Preston White River Springfish (Crenichthys Baileyi Albivallis), G. Gary Scoppettone, Peter H. Rissler

Western North American Naturalist

We determined the distribution and estimated population number of Preston White River springfish (Crenichthys baileyi albivallis) in summer 1998 and winter 1999. The total population was <5000 fish persisting in only 4 of 6 spring systems from which it had been previously captured. To improve its status, we recommend conservation measures.

Go to article

First Prev Next Last