Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Rangeland Management (5)
- Plant Sciences (2)
- Animal temperaments; Animal personalities; Stress coping styles; Cow–calf; GPS; Grazing distribution (1)
- Botanical composition (1)
- Chemometrics (1)
-
- Chihuahuan desert (1)
- Conservation (1)
- Conservation united states mexico (1)
- Criollo cattle (1)
- Flourensia cernua (1)
- Fluorescence (1)
- GPS monitoring (1)
- Grasslands united states conservation (1)
- Herbivory (1)
- Landscape foraging patterns (1)
- Leaf age (1)
- Luminescence (1)
- Phosphate buffered saline (PBS). (1)
- Plant secondary metabolites (1)
- Resource selection functions (1)
- Terpenes (1)
- Volatile Compounds on the Leaf Surface of Intact and Regrowth Tarbush (Flourensia cernua DC) Canopies (1)
- Volatiles (1)
- Within-plant distribution (1)
Articles 1 - 7 of 7
Full-Text Articles in Entire DC Network
Within-Plant Distribution Of Volatile Compounds On The Leaf Surface Of Flourensia Cernua, Rick Estell, Darren James, Ed Frederickson, Dean Anderson
Within-Plant Distribution Of Volatile Compounds On The Leaf Surface Of Flourensia Cernua, Rick Estell, Darren James, Ed Frederickson, Dean Anderson
Ed L. Frederickson
We are using Flourensia cernua as a shrub model to study how terpenes affect livestock herbivory. Two experiments were conducted to examine distribution of volatile chemicals within a plant in an effort to minimize sample variability. In Experiment 1, leaves (current year's growth) were collected from 20 tarbush plants. Two leaders were sampled from each of three positions (outer canopy, subcanopy, and basal) in all four quadrants (based on ordinal direction). In Experiment 2, 10 leaders of current year's growth were removed from another 20 plants. Leaders were collected from the outer canopy of each quadrant and separated into thirds …
An Assessment Of Behavioural Syndromes In Rangeland-Raised Beef Cattle, Robert Wesley, Andrés Cibils, J. Mulliniks, Emily Pollak, Mark Petersen, Ed Frederickson
An Assessment Of Behavioural Syndromes In Rangeland-Raised Beef Cattle, Robert Wesley, Andrés Cibils, J. Mulliniks, Emily Pollak, Mark Petersen, Ed Frederickson
Ed L. Frederickson
Individuals in most animal groups exhibit consistent behavioural differences across situations or over time known as behavioural syndromes. We conducted a study with a herd of young rangeland-raised cows to determine whether animals exhibited consistent differences in foraging behaviours across contexts (confinement vs. rangeland pasture) and could be clustered into behavioural type groups on the basis of a suite of correlated behaviours. We also investigated whether cows with different behavioural types performed differently in this environment. Supplement consumption rate (SCR) in confinement was used to select two groups of cows (fast eaters vs. slow eaters). This classification was validated by …
Characterising The Spatial And Temporal Activities Of Free-Ranging Cows From Gps Data, Dean Anderson, Craig Winters, Rick Estell, Ed Frederickson, Marek Doniec, Carrick Detweller, Daniela Rus, Darren James, Barbara Nolen
Characterising The Spatial And Temporal Activities Of Free-Ranging Cows From Gps Data, Dean Anderson, Craig Winters, Rick Estell, Ed Frederickson, Marek Doniec, Carrick Detweller, Daniela Rus, Darren James, Barbara Nolen
Ed L. Frederickson
Electronic tracking provides a unique way to document behaviour by cows on a continuous basis. Over 2 years 17 beef cows with calves were fitted with global positioning system (GPS) devices programmed to record uncorrected GPS locations at 1-s intervals in a semi-desert rangeland. Each cow was periodically observed during daylight hours and foraging, walking and stationary (standing/lying) activity times were recorded across days and individual cows to calculate a mean travel rate for each activity. Data without observers present were collected immediately preceding and following the abrupt weaning of calves at between 223 and 234 days of age to …
Foraging Behavior Of Heritage Versus Recently Introduced Herbivores On Desert Landscapes Of The American Southwest, Ed Frederickson, H. Peinetti, Debra Peters, Andres Cibils, J. Roacho-Estrada, Andrea Laliberte
Foraging Behavior Of Heritage Versus Recently Introduced Herbivores On Desert Landscapes Of The American Southwest, Ed Frederickson, H. Peinetti, Debra Peters, Andres Cibils, J. Roacho-Estrada, Andrea Laliberte
Ed L. Frederickson
Since the 1800s managed grasslands and shrublands of the arid American Southwest have been grazed predominantly by cattle originally bred for temperate climates in northern Europe. A heritage breed, the criollo cattle, has survived in northern Mexico for more than 400 years under desert-like conditions of low and variable rainfall, hot temperatures in the growing season, and both spatially and temporally scarce levels of primary production. We tested the hypothesis that the heritage breed has a broader spatial foraging distribution under harsh environmental conditions, and that its distribution is driven by environmental variables which differ from those that control the …
Differentiating Among Plant Spectra By Combining Ph Dependent Photoluminescence Spectroscopy With Multi-Way Principal Component Analysis (Mpca), Ed Frederickson, Dean Anderson, T. Danielson, S. Obeidet, G. Rayson, R. Estell, B. Bai
Differentiating Among Plant Spectra By Combining Ph Dependent Photoluminescence Spectroscopy With Multi-Way Principal Component Analysis (Mpca), Ed Frederickson, Dean Anderson, T. Danielson, S. Obeidet, G. Rayson, R. Estell, B. Bai
Ed L. Frederickson
Photoluminescence spectroscopic probes offer the potential for differentiation among plant species in real-time. Spectral emission signatures (excitation at 365 nm) from three different pH (2.2, 7.5 and 12.5) phosphate buffered saline (PBS) extracts from two grasses, Sporobolus flexuosus (Thurb. ex Vasey) Rydb., [mesa dropseed], and Pleuraphis mutica Buckley [tobosa], two forbs, Dimorphocarpa wislizenii (Engelm.) Rollins [spectacle pod], and Sphaeralcea incana Torrey [pale globemallow], and leaves and twigs from two shrubs Flourensia cernua DC. [tarbush], and Atriplex canescens (Pursh) Nutt., [fourwing saltbush] were examined. Since pH has been shown to be pivotal in affecting extraction effi- ciency of other plant compounds …
Grassland In The Borderlands: Understanding Coupled Natural Human Systems And Transboundary Conservation, Ed Frederickson, G. Ceballos, R. List, A. Davidson, Sierra Corona, L. Martinez, J.E. Herrick, J. Pacheco
Grassland In The Borderlands: Understanding Coupled Natural Human Systems And Transboundary Conservation, Ed Frederickson, G. Ceballos, R. List, A. Davidson, Sierra Corona, L. Martinez, J.E. Herrick, J. Pacheco
Ed L. Frederickson
As conservationists well know, political borders rarely coincide with natural ecological boundaries. International borders such as that between the United States and Mexico traverse numerous ecosystems and watersheds. Many species of animals, birds, and insects regularly migrate between habitats across international borders. Conservation of Shared Environments collects works that take on the environmental issues along the U.S.-Mexico border. Covering topics as diverse as wildlife preservation, grassland ecology, water rights, indigenous peoples, and the ecological consequences of border security, the contributors to this volume offer not only scientific analysis but also insight on how to bridge the gaps between scientists, policy …
Volatile Compounds On The Leaf Surface Of Intact And Regrowth Tarbush (Flourensia Cernua Dc) Canopies, Ed Frederickson, R. Estell, M. Remmenga
Volatile Compounds On The Leaf Surface Of Intact And Regrowth Tarbush (Flourensia Cernua Dc) Canopies, Ed Frederickson, R. Estell, M. Remmenga
Ed L. Frederickson
Shrub expansion into desert grasslands is a serious problem resulting in loss of forage and rangeland productivity. Flourensia cernua DC (tarbush) is one such shrub contributing to the decline of Chihuahuan Desert grasslands. Our previous research has shown tarbush consumption by sheep and goats to be negatively related to leaf surface concentration of individual terpenes and epicuticular wax. Concentrations of compounds such as terpenes often change with plant age and phenology. Our objective was to examine the effect of altering the vegetative state of tarbush on volatile chemicals. Ninety tarbush plants were randomly selected, and all biomass within 10 cm …