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

Digital Commons Network™

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

2003

Discipline
Institution
Keyword
Publication
Publication Type
File Type

Articles 4741 - 4770 of 8710

Full-Text Articles in Entire DC Network

Fire Effects On Small Mammal Communities In Dinosaur National Monument, Richard A. Olson, Barry L. Perryman, Stephen Petersburg, Tamara Naumann Jan 2003

Fire Effects On Small Mammal Communities In Dinosaur National Monument, Richard A. Olson, Barry L. Perryman, Stephen Petersburg, Tamara Naumann

Western North American Naturalist

Resource specialists at Dinosaur National Monument utilize both planned and unplanned wildland ignitions in big sagebrush (Artemisia tridentata)–dominated plant communities to restore successional processes, maintain vegetation vigor, and promote diversified landscapes. Short- and long-term effects of prescribed burning on small mammal populations are not well understood. The objectives of this study were to (1) compare small mammal species richness, similarity, and diversity between paired burned and unburned treatment plots, and (2) assess long-term trends of small mammal community responses to burning. Five paired burned/unburned sites having similar vegetation, soils, elevation, and annual precipitation were selected. Prescribed or natural …

Go to article

Laboratory Fattening And Dietary-Fat Effects On Meadow Voles (Microtus Pennsylvanicus), Edward T. Unangst Jr., Bruce A. Wunder Jan 2003

Laboratory Fattening And Dietary-Fat Effects On Meadow Voles (Microtus Pennsylvanicus), Edward T. Unangst Jr., Bruce A. Wunder

Western North American Naturalist

When removed from the field and maintained under laboratory conditions, meadow voles exhibited significant change in body composition. Voles increased body mass due primarily to large gains in lipid mass combined with small losses in fat-free mass. Lipid deposition amounts increased as dietary fat was increased, and animals demonstrated a leveling of body mass instead of continuous unregulated obesity. When dietary fat content was changed, lipid deposition or utilization responded directly. Thus, meadow voles regulate overall body mass and body composition (lipid and fat-free mass) at levels that correspond to dietary quality (fat) and abundance in the laboratory, and they …

Go to article

Effects Of Elk Browsing On Aspen Stand Characteristics, Rampart Range, Colorado, Emil B. Mccain, Jordan I. Zlotoff, James J. Ebersole Jan 2003

Effects Of Elk Browsing On Aspen Stand Characteristics, Rampart Range, Colorado, Emil B. Mccain, Jordan I. Zlotoff, James J. Ebersole

Western North American Naturalist

No abstract provided.

Go to article

Full Issue, Vol. 63 No. 1 Jan 2003

Full Issue, Vol. 63 No. 1

Western North American Naturalist

No abstract provided.

Go to article

The Development Of A Biodegradable Scaffold For A Tissue Engineered Heart Valve, Thomas Adam Alheidt Jan 2003

The Development Of A Biodegradable Scaffold For A Tissue Engineered Heart Valve, Thomas Adam Alheidt

Theses

In the current state of medical technology, there exists the need for a quality medical device to replace a failing heart valve. Presently, mechanical valves as well as donor tissue valves, either from humans or animals are used to replace failing heart valves. These valves although they can operate in the heart satisfactorily are not equal to the body replacing its own valve. Tissue Engineering in simple terms is the field of helping the body replace its own failing organ. In scientific terms, Tissue Engineering is a relatively young field, a majority of the major advancements have come in the …

Go to article

Breeding Movements And Reproductive Activities Of Porcupine In The Great Basin Desert, Richard Alan Sweitzer Jan 2003

Breeding Movements And Reproductive Activities Of Porcupine In The Great Basin Desert, Richard Alan Sweitzer

Western North American Naturalist

I assessed movements of North American porcupines (Erethizon dorsatum) in the Great Basin of northwestern Nevada in relation to reproductive activities during the late summer and fall periods of 1991 and 1992. Porcupines exhibit a mate-defense polygynous mating system and I hypothesized that (1) competitively dominant males would have larger home ranges than both subordinate males and adult females, and (2) variation in home range size among adult male porcupines would be positively correlated with reproductive success. Results indicated that dominant male porcupines ranged over larger areas (average 95% minimum convex polygon home range = 20.7 ha) than …

Go to article

Chromosomal Relationships Among Three Species Of Jackrabbits (Lepus: Leporidae) From Mexico, Consuelo Lorenzo, Fernando A. Cervantes, Julieta Vargas Jan 2003

Chromosomal Relationships Among Three Species Of Jackrabbits (Lepus: Leporidae) From Mexico, Consuelo Lorenzo, Fernando A. Cervantes, Julieta Vargas

Western North American Naturalist

We studied differentially stained karyotypes of the leporids Lepus californicus, L. callotis, and L. flavigularis and described their banding patterns of euchromatin to decide whether results fit expectations of chromosomal rearrangements leading to the karyotypic evolution ancestral of the L. californicus–L. callotis–L. flavigularis lineage. Results confirmed previous findings on numbers of chromosomes (2n's) and fundamental numbers (FNs; except for L. californicus). Homologous G-banding patterns allowed identification of chromosome rearrangements such as pericentric inversions and addition and deletion of euchromatin. Chromosomal rearrangements that we deduced mostly support hypotheses on karyotypic changes in the chromosomal evolution of the Lepus …

Go to article

Small Mammals Within Riparian Habitats Of A Regulated And Unregulated Arid Land River, Miles J. Falck, Kenneth R. Wilson, Douglas C. Andersen Jan 2003

Small Mammals Within Riparian Habitats Of A Regulated And Unregulated Arid Land River, Miles J. Falck, Kenneth R. Wilson, Douglas C. Andersen

Western North American Naturalist

In northwestern Colorado, flow regulation on the Green River has created a transitional plant community that features encroachment by upland vegetation into cottonwood (Populus fremontii)-dominated, riparian forest on topographically high floodplain sites and reduced cottonwood regeneration on low floodplain sites. To assess how these changes might have affected small mammal distributions, in 1994 and 1995 we live-trapped during periods surrounding spring flooding at 3 sites: above and below the confluence of the regulated Green River and at the ecologically similar, but unregulated, Yampa River (reference site). More species were captured at the most regulated site along the Green …

Go to article

Conservative And Moderate Grazing Effects On Chihuahuan Desert Wildlife Sightings, Jamus Joseph, Michelle Collins, Jerry Holechek, Raul Valdez, Robert Steiner Jan 2003

Conservative And Moderate Grazing Effects On Chihuahuan Desert Wildlife Sightings, Jamus Joseph, Michelle Collins, Jerry Holechek, Raul Valdez, Robert Steiner

Western North American Naturalist

Seasonal wildlife observations were made along transects on 2 pastures conservatively grazed (36% use of perennial grasses) and 2 pastures moderately grazed (47% use of perennial grasses) in south central New Mexico in non-drought (1997) and drought years (1998). Experimental pastures were similar in soils, terrain, spacing of watering points, and brush cover. Average ecological condition score for the conservatively grazed pastures was 60% compared with 64% for moderately grazed pastures. Throughout the study total standing vegetation understory herbage levels were higher (P < 0.05) on conservatively grazed than moderately grazed pastures. Total wildlife, total gamebird, and total songbird sightings did not differ (P > 0.05) between conservatively and moderately grazed pastures. Black-tailed jackrabbit (Lepus californicus) sightings were …

Go to article

Effects Of Habitat Disturbance On Diets Of Great Horned Owl (Bubo Virginianus) In A Cold Desert, Shelly R. Kremer, Mark C. Belk Jan 2003

Effects Of Habitat Disturbance On Diets Of Great Horned Owl (Bubo Virginianus) In A Cold Desert, Shelly R. Kremer, Mark C. Belk

Western North American Naturalist

To determine the potential effect of habitat disturbance, Great Horned Owl (Bubo virginianus) diets were quantified in disturbed and undisturbed habitats over a 2-year period at Dugway Proving Ground in the Great Basin Desert of Tooele County, Utah. Invertebrates were the most abundant prey by count, whereas mammals constituted the majority of diet by biomass. Species richness in the diet did not differ between habitats or among seasons after correcting for the number of pellets in each sample. However, the number of vertebrate species was greater than the number of invertebrate species in the diet, and this ratio …

Go to article

Foot Loadings And Pad And Track Widths Of Yellowstone Grizzly Bears, David J. Mattson Jan 2003

Foot Loadings And Pad And Track Widths Of Yellowstone Grizzly Bears, David J. Mattson

Western North American Naturalist

I used measurements of grizzly bears (Ursus arctos horribilis) from the Yellowstone region, USA, to investigate relationships between widths of foot pads and widths of tracks, foot loading and pad size, incidence of tracks and type of activity, and widths of front-foot pads and gender and age-class. Track width was affected by substrates and increased relative to pad width as sizes of both pads and tracks increased. Foot loading (kg · cm−2) did not vary substantially with foot size and so did not explain the proportionately larger tracks of larger animals. Tracks were most commonly associated …

Go to article

Genetic Structure In Striped Skunks (Mephitis Mephitis) On The Southern High Plains Of Texas, Leslie A. Hansen, Nancy E. Mathews, Richard W. Hansen, Bruce A. Vander Lee, R. Scott Lutz Jan 2003

Genetic Structure In Striped Skunks (Mephitis Mephitis) On The Southern High Plains Of Texas, Leslie A. Hansen, Nancy E. Mathews, Richard W. Hansen, Bruce A. Vander Lee, R. Scott Lutz

Western North American Naturalist

Genetic variation within populations reflects population-level social and demographic processes and influences how a population behaves as an evolutionary unit. We examined partitioning of genetic variation in striped skunks (Mephitis mephitis) from the Southern High Plains of Texas during 1994–1995. Sixty-nine male and 35 female skunks were sampled on four 12.8-km2 study plots. Plot centers ranged from 17.6 to 61.6 km apart. We used multi-locus DNA fingerprinting with 2 probes, pV47 and CTTxAGG, to test 3 hypotheses: (1) females are more genetically similar to other females than males are to other males on the same plot (indicating …

Go to article

Model Of Breeding Habitat Of The Mountain Plover (Charadrius Montanus) In Western Wyoming, Gary P. Beauvais, Rebekah Smith Jan 2003

Model Of Breeding Habitat Of The Mountain Plover (Charadrius Montanus) In Western Wyoming, Gary P. Beauvais, Rebekah Smith

Western North American Naturalist

To aid the conservation and management of Mountain Plovers (Charadrius montanus), we developed a spatially explicit model of breeding habitat for the shrub-steppe of western Wyoming. Points of Mountain Plover presence and absence were determined by field surveys conducted May through June 1999. At each point we measured topographic slope and a cover type suitability index related to vegetation height and density. Logistic regression revealed a strong negative relationship between presence and slope, and a weaker and positive relationship between presence and cover index. A multiple logistic regression model using slope and cover index to predict presence successfully …

Go to article

"Curing" Of Nicotiana Attenuata Leaves By Small Mammals Does Not Decrease Nicotine Contents, Ian T. Baldwin Jan 2003

"Curing" Of Nicotiana Attenuata Leaves By Small Mammals Does Not Decrease Nicotine Contents, Ian T. Baldwin

Western North American Naturalist

Basal leaves of Nicotiana attenuata are frequently found neatly excised at the petiole and piled on rocks or soil in the sun until dry, after which they disappear, sometimes to be found again in the nests of Neotoma lepida. In response to herbivore attack, N. attenuata increases the concentration of nicotine in its leaves, where it functions as an induced defense. Since excision of leaves at the petiole allows for leaf removal without substantially activating this induced defense, and air-drying at high temperatures can volatilize nicotine, we examined the hypothesis that the observed leaf "curing" behavior decreased nicotine contents. …

Go to article

The Breeding System Of An Endangered Pupfish (Cyprinodon Elegans), John K. Leiser, Murray Itzkowitz Jan 2003

The Breeding System Of An Endangered Pupfish (Cyprinodon Elegans), John K. Leiser, Murray Itzkowitz

Western North American Naturalist

We examined the breeding behavior of the endangered Comanche Springs pupfish (Cyprinodon elegans) during 3 separate breeding seasons in a pool of springwater originating in Phantom Cave, near Balmorhea State Park, Texas, in relation to behaviors reported for the species in swift-flowing canals (Itzkowitz 1969). In the quiet pool, unlike in swift water, the breeding system was characterized by 3 different male mating tactics: territorial defense, satellite positioning, and sneak spawning. Although the breeding strategies adopted by the males were conditional, mating tactics generally reflected male size. Territorial residents were the largest, satellites were medium-sized, and sneakers were …

Go to article

Evaluation Of Serum Gamma Globulin Concentrations In Neonatal Pronghorn In Oregon, Mike R. Dunbar Jan 2003

Evaluation Of Serum Gamma Globulin Concentrations In Neonatal Pronghorn In Oregon, Mike R. Dunbar

Western North American Naturalist

No abstract provided.

Go to article

Spartan Daily, January 31, 2003, San Jose State University, School Of Journalism And Mass Communications Jan 2003

Spartan Daily, January 31, 2003, San Jose State University, School Of Journalism And Mass Communications

Spartan Daily (School of Journalism and Mass Communications)

Volume 120, Issue 6

Go to article

Interview No. 1569, Inez Rios Jan 2003

Interview No. 1569, Inez Rios

Combined Interviews

Ms. Rios recalls her childhood and what it was like growing up on a farm near Ysleta, Texas, where her father was the foreman; she recalls that prior to the Bracero Program, there were a number of undocumented workers on the farm; they were often caught by immigration services and returned to México; sometime later, roughly in 1948, braceros were hired to work on the farm; they were contracted through Rio Vista, a processing center in Socorro, Texas; she recalls how the braceros were chosen and transported to the farm; in addition, she remembers what their living conditions were like, …

Go to article

Chanticleer | Vol 51, Issue 18, Jacksonville State University Jan 2003

Chanticleer | Vol 51, Issue 18, Jacksonville State University

Chanticleer

No abstract provided.

Go to article

Mustang Daily, January 30, 2003 Jan 2003

Mustang Daily, January 30, 2003

Cal Poly Student Newspaper

Student newspaper of California Polytechnic State University, San Luis Obispo, CA.

Go to article

The Setonian, January 30, 2003, Seton Hall University Jan 2003

The Setonian, January 30, 2003, Seton Hall University

2003

No abstract provided.

Go to article

Murray Ledger And Times, January 30, 2003, Murray Ledger And Times Jan 2003

Murray Ledger And Times, January 30, 2003, Murray Ledger And Times

The Murray Ledger & Times

No abstract provided.

Go to article

Behavioral Economics And The Sec, Stephen Choi, Adam C. Pritchard Jan 2003

Behavioral Economics And The Sec, Stephen Choi, Adam C. Pritchard

Law & Economics Working Papers Archive: 2003-2009

Investors face myriad investment alternatives and seemingly limitless information concerning those alternatives.Not surprisingly, many commentators contend that investors frequently fall short of the ideal investor posited by the rational actor model. Investors are plagued with a variety of behavioral biases (such as, among others, the hindsight bias, the availability bias, loss aversion, and overconfidence). Even securities market institutions and intermediaries may suffer from biases, led astray by groupthink and overconfidence. The question remains whether regulators should focus on such biases in formulating policy. An omnipotent regulatory decisionmaker would certainly improve on flawed investor decisionmaking. The alternative we face, however, is …

Go to article

The Missouri Miner, January 30, 2003 Jan 2003

The Missouri Miner, January 30, 2003

The Missouri Miner Newspaper

No abstract provided.

Go to article

The Daily Egyptian, January 30, 2003, Daily Egyptian Staff Jan 2003

The Daily Egyptian, January 30, 2003, Daily Egyptian Staff

January 2003

No abstract provided.

Go to article

2002 (July-December) Performance And Progress Report: Unh/Noaa Joint Hydrographic Center, Larry A. Mayer, Noaa-Unh Joint Hydrographic Center (Jhc/Ccom) Jan 2003

2002 (July-December) Performance And Progress Report: Unh/Noaa Joint Hydrographic Center, Larry A. Mayer, Noaa-Unh Joint Hydrographic Center (Jhc/Ccom)

Progress Reports

Report Period: 07/01/2002 – 12/31/2002

Go to article

January 30, 2003, Council On Academic Affairs Jan 2003

January 30, 2003, Council On Academic Affairs

Minutes

No abstract provided.

Go to article

Bibliography Of Helminth Species Described From African Vertebrates 1800-1967, Albert G. Canaris, Scott Lyell Gardner Jan 2003

Bibliography Of Helminth Species Described From African Vertebrates 1800-1967, Albert G. Canaris, Scott Lyell Gardner

Harold W. Manter Laboratory of Parasitology: Faculty Publications

Parasite lists, hosts lists, and bibliographies for Trematoda, Cestoda, Nematoda, and Acanthocephala.
100 pages.

Go to article

Lanthorn, Vol. 37, No. 22, January 30, 2003, Grand Valley State University Jan 2003

Lanthorn, Vol. 37, No. 22, January 30, 2003, Grand Valley State University

Volume 37, July 11, 2002 - June 19, 2003

Lanthorn is Grand Valley State's student newspaper, published from 1968 to the present.

Go to article

The Bg News January 30, 2003, Bowling Green State University Jan 2003

The Bg News January 30, 2003, Bowling Green State University

BG News (Student Newspaper)

The BGSU campus student newspaper. January 30, 2003. Volume 92-Issue 12.

Go to article

First Prev Next Last