Now showing items 10157-10176 of 20709

    • 'J. G. Lemmon & Wife,' Plant Explorers in Arizona, California, and Nevada

      Crosswhite, Frank S.; Boyce Thompson Southwestern Arboretum; Department of Plant Sciences, University of Arizona (University of Arizona (Tucson, AZ), 1979-08)
    • Jackrabbit densities on fair and good condition Chihuahuan desert range

      Daniel, A.; Holechek, J.; Valdez, R.; Tembo, A.; Saiwana, L.; Fusco, M.; Cardenas, M. (Society for Range Management, 1993-11-01)
      This study was conducted on Chihuahuan desert range near Las Cruces, in southcentral New Mexico, to determine the relationship of blacktailed jackrabbit (Lepus californicus) densities to good (GC) and fair (FC) range condition. The Soil Conservation Service procedure was used to classify ecological range condition. Line transect procedures were used to estimate jackrabbit populations from July 1988 to December 1990. Concurrently vegetation cover and mean plant height were determined with the line intercept procedure. Jackrabbit densities on the fair condition range were higher (P < 0.10) than those on the good condition range. This difference is attributed to the fair condition range containing more protective cover and preferred forage than good condition range. Jackrabbit abundance showed no season (P < 0.10) or year differences (P < 0.10). Jackrabbits preferred grass-shrub mosaic habitats more than shrubland and grassland habitats. The need for diverse food sources and protective cover were apparently major determinants of habitat selection by jackrabbits. The good condition range contained greater (P < 0.10) grass cover and less (P < 0.10) shrub cover than the fair condition range. Our results indicated that maintaining Chihuahuan desert ranges in good to excellent condition is the best means of achieving lower abundance of jackrabbit populations.
    • Jackrabbits

      McAdoo, J. Kent; Young, James A. (Society for Range Management, 1980-08-01)
    • Jackson Hole, Wyoming: A Summer Tradition Continues

      Samuel, Marilyn J. (Society for Range Management, 1986-02-01)
    • Jaguar and Puma Predation on Cattle Calves in Northeastern Sonora, Mexico

      Rosas-Rosas, Octavio C.; Bender, Louis C.; Valdez, Raul (Society for Range Management, 2008-09-01)
      Predation by jaguars (Panthera onca) and pumas (Puma concolor) is often a source of conflict with cattle ranching in northeastern Sonora, Mexico. Because jaguars are endangered in Mexico, such conflicts have biological, social, and economic consequences. We documented the extent of predation by jaguars and pumas on cattle in 1999-2004 in northeastern Sonora, where the northernmost breeding population of jaguars exists in North America. Jaguars and pumas killed only calves , 12 mo old, and calves constituted 58% of prey biomass consumed by jaguars and 9% by pumas. Annual cause-specific mortality rates of confirmed jaguar predation (< 0.018), confirmed and suspected jaguar predation (< 0.018), and all confirmed and suspected large felid predation (< 0.018) were low and cattle calf survival was high (0.89-0.98 annually). If calves reported as missing but for which no evidence of mortality could be found were classed as large felid predation, annual cause-specific rates increased to 0.006-0.038. Collectively, confirmed jaguar and puma predation accounted for < 14% (57/408) of total cattle losses, with jaguars responsible for 14% of all calf losses; this could increase to a maximum of 36% (146/408) if missing calves were included in the totals. While jaguar and puma predation may have an impact on some small cattle operations, it is generally minor compared to losses from other causes in northeastern Sonora. Moreover, 91% of all confirmed calf kills were associated with three individual jaguars in our study. Targeting problem cats rather than broad-scale predator control may therefore be a viable alternative to address chronic predation problems. Because most (83%) instances of jaguar predation occurred during the dry season along thick riparian habitats, modified cattle husbandry operations, such as establishment of permanent water sources in uplands and away from dense vegetative cover, could ameliorate many cases of predation by jaguars on cattle. 
    • Jaguar Critical Habitat Designation Causes Concern for Southwestern Ranchers

      Svancara, Colleen M.; Lien, Aaron M.; Vanasco, Wendy T.; Lopez-Hoffman, Laura; Bonar, Scott A.; Ruyle, George B. (Society for Range Management, 2015-12-01)
      On the Ground • The designation of jaguar critical habitat in April 2014 in southern Arizona and southwestern New Mexico created concern for livestock ranchers in the region. • We interviewed ranchers to understand their concerns with the jaguar critical habitat designation and their attitudes toward jaguars, wildlife conservation, and resource management in general. • Ranchers we interviewed were concerned about direct impacts of designated critical habitat on ranching, as well as possible alternative agendas of critical habitat advocates and issues specific to the borderlands region. • The ranchers were less concerned about the presence of jaguars but were more concerned about possible limiting effects of the Endangered Species Act (ESA), distrust of government entities, and litigious environmental groups. • To maximize effectiveness, government agencies should work to foster trust in the ranching community, be cognizant of sensitive issues specific to the region that may challenge endangered species conservation goals, recognize the opportunity to work with ranchers for endangered species management, and provide outreach about implications of the ESA.
    • James Brown v. In-Frin-Jr: How Moral Rights Can Steal the Groove [Note]

      Williams, Brandon G. (The University of Arizona James E. Rogers College of Law (Tucson, AZ), 2000)
    • James Louis Giddings, 1909-1964

      Tree-Ring Society, 1965-11
      Tree -ring characteristics are studied within and among stems of four Pinus ponderosa Laws. located at several semiarid sites in northern Arizona. Analyses are made of changes associated with certain physiological, height, and age gradients within the tree. Rings are grouped into twenty or forty-year intervals, are classified in four different arrangements, and the characteristics for the intervals are averaged and plotted to represent the gradients within the tree stem. Tree-rings are widest near the base and central portions of the stem. Ring width decreases with increasing age of the cambium, with increasing height within the young stem, with decreasing terminal growth, and with increasing environmental stress. Double (false or intra-annual) rings occur most frequently in the wide rings near the base and in the younger portions of the stem, or in the upper stem and branches of older trees. The frequency of rings which are locally absent (partial rings) is inversely related to ring width, and directly related to the potentiality for water stress conditions in the site or within the tree. Correlations among the year-to-year ring-width patterns throughout the tree generally increase with increasing tree age and frequency of water stress. They are high within the lower and central bole portions of older trees, but in the upper stem, in lateral branches, and in trees on the most extreme sites correlations among ring-width patterns are somewhat lower. Relative variability in widths of adjacent rings increases with decreasing ring width, increasing age, increasing height in the stem, and increasing environmental stress. First order serial correlation is frequently highest in older trees on semiarid sites. Many of these changes in ring characteristics within the tree are attributed to specific gradients or changes in auxin, food, and water supplies. A wide sampling of annual rings from the base of many semiarid site trees appears more appropriate for evaluating past fluctuations in climatic factors than an intensive sampling of rings at several heights in only a few trees.
    • January 19, 1989 Speech Accepting the Honor Given by the Arizona Journal of International &(and) Comparative Law

      Kozolchyk, Boris (The University of Arizona James E. Rogers College of Law (Tucson, AZ), 1989)
    • Japanese Brome Response to Atrazine in Combination With Nitrogen Fertilizer in the Mixed Prairie

      Hewlett, D. B.; Johnson, J. R.; Butterfield, R. I.; Mosley, V. K. (Society for Range Management, 1981-01-01)
      Atrazine was used to control Japanese brome in conjunction with nitrogen fertilization to determine if herbage production could be increased more than by fertilization alone. Atrazine treatments included a single application, application in alternate years, and application for two or three consecutive years. Atrazine did not significantly increase production more than fertilizer alone and caused some decreases in western wheatgrass production at low rates of N in one year at one location. Unless atrazine was applied in two or more years, Japanese brome was a prevalent the second growing season after application as where it had never been controlled. Application of atrazine in consecutive years increased shortgrass production at one location.
    • Japanese Fiscal Policies: Lessons from the Past and Issues for the Future [Article]

      Gutterman, Alan S. (The University of Arizona James E. Rogers College of Law (Tucson, AZ), 1991)
    • Japanese Quail Used as Research Fowl

      Hendershott, R. D.; Reid, B. L.; Department of Poultry Science; Department of Poultry Science (College of Agriculture, University of Arizona (Tucson, AZ), 1966)
    • Japanese Social Organization in the Tokugawa and Post-World War II Periods: Changes in Family and Household Structure and Organization

      Poncelet, Eric C. (University of Arizona, Department of Anthropology, 1992)
      The notion that economic changes embedded in Japan's transition from an agriculturally-based to an industrially-based economy have been associated with corresponding changes in family structure and organization is tested. Changes which did occur were relative and not absolute. Changes in Japanese social organization since 1600 have not been uniform but in fact have been quite varied depending on socio-economic and ecological conditions. Current Japanese trends of decreasing agriculture and increasing industrial urbanization will lead to a continuation in the emergence of the single-person and nuclear family households, equal succession and inheritance, "love" marriages, and neolocal residence as the dominant forms. Nevertheless, the Japanese people are unique in their ongoing attachment to their rich cultural heritage. As long as this loyalty continues, the ie principle will continue to hold an important position in their social lives.
    • Jarbidge Ranger District: It Can Be Done

      Timothy, Kenneth (Society for Range Management, 1980-08-01)
    • Jatropha (Euphorbiaceae) in Southwestern United States and Adjacent Northern Mexico

      Johnson, Matthew B.; Desert Legume Program, The University of Arizona (University of Arizona (Tucson, AZ), 1998-12)
    • Javanese Applicative Construction

      Nurhayani, Ika; Cornell University (University of Arizona Linguistics Circle (Tucson, Arizona), 2012)
      Javanese has an applicative suffix –ake, which serves to license a benefactive, instrumental or theme suffix as a core object. Each of them has a thematic paraphrase in which the applicative argument is contained in a PP. The multiplicity of –ake poses problems for Marantz (1993) with his single applicative head. First, the uses of the applicative morpheme –ake must be lumped together in a single applicative head. Second, there is no attempt at all to account for the relation between the applicative constructions and their thematic paraphrases. I argue that Bowers’s (2010) framework can solve the problems with multiple argument heads merged in accordance with a fixed Universal Order of Merge (UOM). There are three primary argument-types, Ag(ent), Th(eme) and Aff(ectee) and secondary argument-types of various kinds, including Instr(ument), Ben(eficiary), Source, Goal, and others. Any head can potentially host an applicative morpheme. In Javanese, the morpheme -ake can be associated with an Aff-head, an Inst-head or a Th-head. Furthermore, in each case, applicative construction and its thematic paraphrase are derived from virtually identical structures because the argument head may have more than one selectional possibility for a DP with unvalued case feature or a PP.
    • Jean Snider Schadler—A Woman in Range Management

      Turner, Sherry (Society for Range Management, 1984-02-01)
    • Jean-Charles Fontes (3 November 1936 – 2 February 1994)

      Fritz, Peter; Gonfiantini, Roberto; Zuppi, GianMaria (Department of Geosciences, The University of Arizona, 1994-01-01)
    • Joe Phy - Gladiator

      Rockfellow, John A. (Arizona State Historian (Phoenix, AZ), 1930-10)