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: Beyond the Edge of a Niche
    sub title: The Role of Grazing on Prymnesium Parvum Bloom Formations in Two Texas Lakes
  name:
    name part: Davis, Stephen Louis
    role:
      role term: creator
    role:
      role term: author.
  name:
    name part: Roelke, Daniel L.
    role:
      role term: thesis advisor.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2015
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: Prymnesium parvum (golden algae) is a harmful algal bloom species that has caused tens of millions of dollars in natural resource damages in Texas as a result of massive fish kills. This species is present in many Texas lakes, but does not form blooms in all of them. Previous literature has suggested that predation, specifically by rotifers, may be an important loss factor to P. parvum populations. This research is focused on investigating whether grazing by rotifers is a significant factor in the prevention of blooms in some lakes. Three-day in-lake mesocosm experiments were conducted during times of bloom initiation and bloom development in two Texas lakes (Whitney and Somerville) where the former experiences P. parvum blooms and the latter does not. Controls and treatments consisted of P. parvum cultures in log- and stationary-growth phases, natural phytoplankton assemblages, and natural rotifer assemblages from each lake. Monitored parameters included P. parvum population density and population growth rate, toxicity, chlorophyll-a, and zooplankton biovolume. Findings reveal that rotifers in Lake Somerville preferentially grazed P. parvum of all growth phases, while experiencing no negative effects from exposure. Some rotifers even exhibited trends of positive effects from exposure. The mesocosm experiments confirmed that rotifer assemblages in Lake Somerville effectively graze P. parvum with no observed negative effects. These findings support the theory that grazing of P. parvum by rotifers is an important contributing factor preventing blooms in Lake Somerville. On the other hand, rotifers from the winter Lake Whitney experiment appeared to preferentially graze P. parvum populations inoculated from log-growth phase culture while significant reductions in rotifer biovolume were observed. P. parvum inoculated from stationary-growth phase culture were not significantly grazed, nor were other phytoplankton within the treatment suggesting that sub-lethal toxic effe…
  note: by Stephen Louis Davis.
  note: "Major Subject: Water Management and Hydrological Science"
  note: Includes vita.
  note: Master of Science Texas A & M University 2014 http://hdl.handle.net/1969.1/152589
  note: Includes bibliographical references.
  note: Text (Thesis)
  subject:
    topic: Major Water Management and Hydrological Science
  subject:
    topic: Prymnesium parvum
  subject:
    topic: Golden algae
  subject:
    topic: Harmful algal bloom
  identifier: http://hdl.handle.net/1969.1/152589
  record info:
    record content source: TXA
    record creation date: 150203
    record change date: 20151206125635.0
    record identifier: in00003499999
    language of cataloging:
      language term: eng