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: influence of environmental factors on spatial and temporal variation of fish assemblages in the lower Brazos River, Texas
  name:
    name part: Li, Raymond Y.
    role:
      role term: creator
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: xx
    date issued: 2003
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    form: remote
    extent: ix, 71 leaves : illustrations, maps ; 28 cm.
  abstract: Large floodplain rivers are spatially heterogeneous and temporally dynamic ecosystems. However, few studies have quantified the variation or species-environment relationships of fish assemblages in the main-channel of large rivers. Fishes were collected along a 10 km reach of the lower Brazos River, a large floodplain river in Texas. Collections targeted the 15th, 30th, and 50th percentile discharge rates of summer and winter seasons. My objectives were: (1) to compare fish assemblage structure in shallow river-margins versus deepwater habitats, (2) to evaluate the spatial and temporal variability of fish assemblages in these two habitats, (3) to identify species-environment relationships that likely structure these assemblages, and (4) to quantify the relative variation in assemblage structure as related to environmental versus seasonal sources. A total of 41 species and 28,469 individual fishes were collected. Assemblages were less variable than levels typically reported for streams and had weak species environment relationships. Temporal variability of the shallow river-margin fish assemblage was primarily the result of juvenile recruitment, displacement of individuals following spates, or seasonal immigration by Mugil cephalus. Among the deepwater assemblages, increased movement associated with reproductive activities increased temporal variation. Spatial variation was detected only among deepwater assemblages and was related to velocity. Eighteen commonly collected species were evaluated for relationships with environmental variables and season. Shallow river-margin assemblages were dominated by habitat-generalists and were most strongly differentiated by season, discharge and conductivity. Deepwater samples were dominated by Lepisosteus osseus and L. oculatus and were most strongly differentiated by velocity. For shallow river-margin and deepwater assemblages, environmental variables uniquely explained more of the total variation than season. Results of this s…
  note: by Raymond Y. Li.
  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 2003
  note: Includes bibliographical references (leaves 56-64).
  subject:
    topic: Major wildlife and fisheries sciences
  identifier: https://hdl.handle.net/1969.1/ETD-TAMU-2003-THESIS-L514
  related item:
    location:
      url: https://hdl.handle.net/1969.1/ETD-TAMU-2003-THESIS-L514
  record info:
    record content source: TXA
    record creation date: 040706
    record change date: 20220103114515.0
    record identifier: in00001851665