Search Results - "Fredrickson, Ed"

Black-tailed prairie dogs, cattle, and the conservation of North America's arid grasslands by Sierra-Corona, Rodrigo, Davidson, Ana, Fredrickson, Ed L, Luna-Soria, Hugo, Suzan-Azpiri, Humberto, Ponce-Guevara, Eduardo, Ceballos, Gerardo

“…Prairie dogs (Cynomys spp.) have been eliminated from over 95% of their historic range in large part from direct eradication campaigns to reduce their…”
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Do Changes in Connectivity Explain Desertification? by Okin, Gregory S, Parsons, Anthony J, Wainwright, John, Herrick, Jeffrey E, Bestelmeyer, Brandon T, Peters, Debra C, Fredrickson, Ed L

“…Arid and semiarid regions cover more than 40% of Earth's land surface. Desertification, or broadscale land degradation in drylands, is a major environmental…”
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Rapid response of a grassland ecosystem to an experimental manipulation of a keystone rodent and domestic livestock by Davidson, Ana D, Ponce, Eduardo, Lightfoot, David C, Fredrickson, Ed L, Brown, James H, Cruzado, Juan, Brantley, Sandra L, Sierra-Corona, Rodrigo, List, Rurik, Toledo, David, Ceballos, Gerardo

“…Megaherbivores and small burrowing mammals commonly coexist and play important functional roles in grassland ecosystems worldwide. The interactive effects of…”
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Effect of light intensity and wavelength on concentration of plant secondary metabolites in the leaves of Flourensia cernua by Estell, Rick E., Fredrickson, Ed L., James, Darren K.

“…Flourensia cernua (tarbush) is a shrub that has encroached into grasslands in many areas of the northern Chihuahuan Desert and contains high levels of…”
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Ecological services to and from rangelands of the United States by Havstad, Kris M., Peters, Debra P.C., Skaggs, Rhonda, Brown, Joel, Bestelmeyer, Brandon, Fredrickson, Ed, Herrick, Jeffrey, Wright, Jack

“…The over 300 million ha of public and private rangelands in the United States are characterized by low and variable precipitation, nutrient-poor soils, and…”
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An assessment of behavioural syndromes in rangeland-raised beef cattle by Wesley, Robert L., Cibils, Andrés F., Mulliniks, J. Travis, Pollak, Emily R., Petersen, Mark K., Fredrickson, Ed. L.

“…Individuals in most animal groups exhibit consistent behavioural differences across situations or over time known as behavioural syndromes. We conducted a…”
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Thirteen-year growth response of ponderosa pine plantations to dominant shrubs (Arctostaphylos and Ceanothus) by Zhang, Jianwei, Busse, Matt D., Fiddler, Gary O., Fredrickson, Ed

“…Thirteen-year growth response of ponderosa pine to various manipulations of understory vegetation was studied to determine if a threshold of understory cover…”
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Disentangling Complex Landscapes: New Insights into Arid and Semiarid System Dynamics by PETERS, DEBRA P. C, BESTELMEYER, BRANDON T, HERRICK, JEFFREY E, FREDRICKSON, ED L, MONGER, H. CURTIS, HAVSTAD, KRIS M

“…Although desertification is a global phenomenon and numerous studies have provided information on dynamics at specific sites, spatial and temporal variations…”
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Dust emissions from undisturbed and disturbed, crusted playa surfaces: cattle trampling effects by Baddock, Matthew C, Zobeck, Ted M, Van Pelt, R. Scott, Fredrickson, Ed L

“…Dry playa lake beds can be significant sources of fine dust emission. This study used a portable field wind tunnel to quantify the PM10 emissions from a bare,…”
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An object-based image analysis approach for determining fractional cover of senescent and green vegetation with digital plot photography by Laliberte, A.S., Rango, A., Herrick, J.E., Fredrickson, Ed L., Burkett, L.

“…Research into automatic image processing of digital plot photography has increased in recent years. However, in most studies only overall vegetation cover is…”
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Within-plant distribution of volatile compounds on the leaf surface of Flourensia cernua by Estell, Rick E., James, Darren K., Fredrickson, Ed L., Anderson, Dean M.

“…We are using Flourensia cernua as a shrub model to study how terpenes affect livestock herbivory. Two experiments were conducted to examine distribution of…”
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Foraging behavior of heritage versus recently introduced herbivores on desert landscapes of the American Southwest by Peinetti, H. Raul, Fredrickson, Ed L, Peters, Debra P. C, Cibils, Andres F, Roacho-Estrada, J. Octavio, Laliberte, Andrea S

“…Since the 1800s managed grasslands and shrublands of the arid American Southwest have been grazed predominantly by cattle originally bred for temperate…”
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Spatial Analysis of Effects of Mowing and Burning on Colony Expansion in Reintroduced Black-Tailed Prairie Dog (Cynomys ludovicianus) by Northcott, Jason, Andersen, Mark C, Roemer, Gary W, Fredrickson, Ed L, DeMers, Michael, Truett, Joe, Ford, Paulette L

“…Factors governing the rate and direction of prairie dog (Cynomys spp.) colony expansion remain poorly understood. However, increased knowledge and ability to…”
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Volatile composition of Gutierrezia sarothrae (broom snakeweed) as determined by steam distillation and solid phase microextraction by Lucero, M.E, Fredrickson, E.L, Estell, R.E, Morrison, A.A, Richman, D.B

“…Volatiles of Gutierezia sarothrae (broom snakeweed, snakeweed) were isolated from ground, composite tissues by steam distillation and by solid phase…”
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Photoluminescent Distinction among Plant Life Forms Using Phosphate Buffered Saline Extract Solutions by Danielson, Timothy L., Obeidat, Safwan, Rayson, Gary D., Anderson, Dean M., Fredrickson, Ed L., Estell, Rick E.

“…Photoluminescence of plant extract solutions has been investigated for discrimination of plant life forms (grasses, forbs, and shrubs) using principal…”
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Impact of filter paper on fluorescence measurements of buffered saline filtrates by Danielson, Timothy L, Rayson, Gary D, Anderson, Dean M, Estell, Rick, Fredrickson, Ed L, Green, Barbara S

“…Fluorescent contaminants have been observed when stock solutions of phosphate buffered saline solutions at each of three pH values (2.2, 7.5, and 12.5) are…”
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essential oil composition of Psorothamnus scoparius (A. Gray) Rydb by Lucero, M.E, Estell, R.E, Fredrickson, E.L

“…Psorothamnus scoparius (broom dalea) was collected from the Jornada Experimental Range in south central New Mexico. Current year's growth was collected from 10…”
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ToutchaLebgue KelengGustavoQuintana MartínezCactáceas de Chihuahua: Tesoro Estal en Peligro de ExtinctionFondo Mixto-Conacyt, Gobierno del Estado, Chihuahua, Mexico2010243US$25. softcover. ISBN 978-7788-34-8 by Fredrickson, Ed

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retention index calculator simplifies identification of plant volatile organic compounds by Lucero, Mary, Estell, Rick, Tellez, María, Fredrickson, Ed

“…INTRODUCTION: Plant volatiles (PVOCs) are important targets for studies in natural products, chemotaxonomy and biochemical ecology. The complexity of PVOC…”
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Essential Oil of Dyssodia acerosa DC by Tellez, Mario R, Estell, Rick E, Fredrickson, Ed L, Havstad, Kris M

“…Samples of the suffrutescent Dyssodia acerosa DC. were collected from the Jornada Experimental Range in south-central New Mexico, and GC/MS and retention…”
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