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: Diets and prey selection of pinfish and southern flounder in a Halodule wrightii seagrass meadow
  name:
    name part: Czapla, Thomas E.
    name part: 1958-
    role:
      role term: creator
  name:
    name part: Park, E. Taisoo
    role:
      role term: degree supervisor.
  name:
    name part: Sweet, Merrill H.
    role:
      role term: degree supervisor.
  name:
    name part: Aldrich, David A.
    role:
      role term: degree committee member.
  name:
    name part: Minello, Thomas J.
    role:
      role term: degree committee member.
  name:
    name part: Ray, Sammy M.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1991
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xii, 93 leaves : illustrations ; 29 cm
  abstract: Effects of prey species and densities on diet and selection by pinfish and southern flounder were investigated in a Halodule wrightii seagrass meadow. A drop sampler/rotenone collection procedure was used to quantitatively sample predator and prey densities during the spring and early summer. Densities of most infauna, epifauna and macrofauna prey peaked in April and May. Periods of low density were attributed to mortality from environmental extremes and predation. Overall, pinfish were much more abundant than southern flounder, and densities of pinfish declined over the sampling period. The plant component in the diet of pinfish increased as these fish grew through the spring and early summer. Rather than evidence for a switch in this animal's diet, however, this shift to a predominantly plant diet appeared to be due to low densities of preferred animal prey. Plant material may have been incidental in the diet of these fish. Among animal prey, a modified linear index (MLI) was used to detect selection of prey over random feeding. Pinfish positively selected amphipods as prey and avoided annelids. Shrimp prey had positive MLIs in late spring and early summer, but values were not significantly different from those of random feeding. Data from fish collected in the field indicated that pinfish consumed prey between 10 and 33% of their own total length. Both predators exhibited no strong selection among available sizes in laboratory experiments. When two species of shrimp of the same size were offered to pinfish and southern flounder, predator fish did not significantly select either prey. In field experiments where prey densities were manipulated, pinfish selected amphipods and brown shrimp when they were available at elevated densities. Grass shrimp were negatively selected by pinfish even in treatments with increased densities of these shrimp. Southern flounder selected brown shrimp as prey regardless of their densities, while avoiding grass shrimp and amphipods.
  note: Typescript (photocopy).
  note: Vita.
  note: "Major subject: Zoology."
  note: Ph. D. Texas A & M University 1991
  note: Includes bibliographical references.
  subject:
    geographic code: nm-----
  subject:
    topic: Lagodon rhomboides
    topic: Food
    geographic: Mexico, Gulf of
  subject:
    topic: Flatfishes
    topic: Food
    geographic: Mexico, Gulf of
  subject:
    topic: Aquatic ecology
    geographic: Mexico, Gulf of
  subject:
    topic: Major zoology
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 921105
    record change date: 20200904152545.0
    record identifier: in00001107418
    language of cataloging:
      language term: eng