rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    non sort: The
    title: role of grain sorghum in conservation of predatory arthropods of Texas cotton
  name:
    name part: Prasifka, Jarrad Reed.
    role:
      role term: creator
  name:
    name part: Heinz, Kevin M.
    role:
      role term: thesis advisor.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2004
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: Four separate but complimentary studies investigated the role of grain sorghum as a predator source for Southern Rolling Plains cotton in 2001 and 2002. Objectives were to: (1) determine the timing and magnitude of predator movement between crops, (2) test putative causes of movement by manipulating prey levels at different stages of crop phenology, (3) explore the feeding and reproductive behavior of a common predator colonizing cotton, and (4) examine the effects of grain sorghum and uncultivated areas on cotton predator abundance at an area-wide scale. Rubidium mark-recapture experiments indicated grain sorghum fields produced a net predator gain for adjacent cotton. Analysis suggested two coccinellids, Hippodamia convergens Guérin-Méneville and Scymnus loewii Mulsant, were responsible for the overall pattern of predator movement. Predator movement into cotton did not appear to be concentrated at specific stages of sorghum phenology. Manipulations of aphid levels in field cages were used to determine if prey abundance or phenology influenced the movement of H. convergens into cotton. In both years, more lady beetle adults were collected on cotton during the latest stages of sorghum phenology. In the second year, relatively low aphid densities (15 per plant) appeared to influence the movement of beetles onto caged cotton. Carbon isotope ratios of H. convergens were used to assess adult feeding behavior after colonizing cotton and to determine if prey consumed in sorghum contributed to egg production in cotton. Though aphids were absent 2001, H. convergens adults stayed in cotton, did not produce eggs and apparently consumed few prey. Cotton aphids were present in 2002 and H. convergens isotope ratios changed from prey consumed in cotton. The isotope ratios of egg masses collected in 2002 indicated prey consumed in grain sorghum contributed very little to egg production in cotton. An area-wide pattern analysis suggested the abundance of grain sorghum and uncultivat…
  note: by Jarrad Reed Prasifka.
  note: Vita.
  note: Abstract.
  note: "Major Subject: Entomology"
  note: Title from author supplied metadata (record created on Jul. 18, 2005.)
  note: Electronic resource.
  note: System requirements: Adobe Acrobat Reader.
  note: Ph.D. Texas A&M University 2003.
  note: Includes bibliographical references.
  note: Text (Dissertation).
  subject:
    topic: Major entomology
  subject:
    topic: biological control
  subject:
    topic: rubidium
  subject:
    topic: carbon
  subject:
    topic: Hippodamia convergens
  subject:
    topic: stable isotope
  subject:
    topic: movement
  identifier: http://hdl.handle.net/1969.1/504
  record info:
    record content source: TXA
    record creation date: 050728
    record change date: 20151102050847.0
    record identifier: in00002058556