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:
    title: Multiple prey traits, multiple predators
    sub title: keys to understanding complex species interactions
  name:
    name part: Langerhans, Randall Brian.
    role:
      role term: creator
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: xx
    date issued: 2002
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    form: remote
    extent: x, 74 leaves : illustrations ; 28 cm.
  abstract: Species interactions generate both natural selection and ecological community structure. Among the more interesting species interactions are those that create adaptive tradeoffs-where phenotypes conferring improved performance in interactions with one species decrease performance with another. Such tradeoffs create divergent natural selection and favor the evolution of strategies such as phenotypic plasticity. Functional tradeoffs may also provide little "enemy-free space" for a focal species in complex communities, resulting in emergent ecological impacts. Emergent community properties arise when community patterns are not predicted based on additive knowledge of pairwise interactions. These emergent impacts typically result from indirect effects, where interactions between two species depend on intermediary species. In this thesis, I examined constraints on the evolution of phenotypic plasticity and addressed its potential significance in community dynamics. I further reviewed concepts and issues related to linking functional and community studies to elucidate mechanisms underlying community structure. I proposed an integrative approach to the subject, emphasizing four major areas of promise, by combining perspectives of ecology and evolution. Freshwater physid snails induce defensive phenotypes in the presence of specialized molluscivorous sunfish. While predator-induced shells reduce predation from shell-crushing fish, I examined whether non-predatory fish induced unnecessary responses. I raised freshwater snails, Physella virgata, with either molluscivorous or non-molluscivorous sunfish species. Regardless of the predator class with which they were raised, snails exhibited two induced responses: reduced growth, and development of rotund shells. Although induced responses are adaptive in the presence of molluscivorous species, responding unnecessarily to non-molluscivores is maladaptive. Both growth reduction and rotund shells entail substantial costs without co…
  note: by Randall Brian Langerhans.
  note: "Major subject: Wildlife and Fisheries Sciences".
  note: Vita.
  note: Also available online.
  note: Issued also on microfiche from Lange Micrographics.
  note: M.S. Texas A&M University 2002
  note: Includes bibliographical references (leaves 57-73).
  subject:
    topic: Major wildlife and fisheries sciences
  identifier: https://hdl.handle.net/1969.1/ETD-TAMU-2002-THESIS-L365
  related item:
    location:
      url: https://hdl.handle.net/1969.1/ETD-TAMU-2002-THESIS-L365
  record info:
    record content source: TXA
    record creation date: 030714
    record change date: 20220103114426.0
    record identifier: in00001773084