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: Modeling an endangered species in an urban landscape
    sub title: fountain darter (Etheostoma fonticola) survival in the Upper San Marcos River, Hays County, Texas
  name:
    name part: Wilkins, Leann I.
    role:
      role term: creator
  name:
    name part: Grant, William E.
    role:
      role term: thesis advisor.
  name:
    name part: Mora, Miguel A.
    role:
      role term: thesis advisor.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2010
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: To accommodate for human population growth along the Texas I-35 corridor, land is becoming increasingly urban and decreasingly pervious, modifying the infiltration and runoff rates in the Edwards Aquifer, especially to its spring fed Upper San Marcos River (USMR). Contaminants like heavy metals and organic chemicals can accumulate on impervious surfaces and with runoff, enter into the USMR at potentially harmful levels. The objective of this study was to determine how the population of an endangered Edwards Aquifer species, the fountain darter (Etheostoma fonticola), might respond to potential water quality changes associated with urbanization. I developed a stochastic, sex and stage-structured population dynamics simulation model that represents the relationships between urbanization, springflow variations, contamination levels, and natural history of the fountain darter. Future fountain darter population trends (2008-2040) were simulated under 10 treatments of nine scenarios. A simulation scenario (n=50) corresponded to one of three variations of springflow (random, high and low flow) and one of three variations in percentage of runoff entering the river (100, 50 or 30). The 10 treatments were variations on water quality: uncontaminated (1), contaminated by Cu (2), Zn (3), Cd (4), Cr (5), polycyclic aromatic hydrocarbons (PAH) (7), bifenthrin (8), carbaryl (9) and dicamba (10) and an additive affect of Cu, Cr, Cd, and Zn (6). Simulating ideal conditions, the average darter population from 2008-2040 was 54155+2969 (mean+SE) individuals. Contaminant treatments that caused a significant (p<0.001) decline in the population by 2040 under 100% runoff conditions were the all metal (650 plus/minus 640), Cu (3141 plus/minus 265), PAH (4621 plus/minus 475), Zn (6169 plus/minus 5406), and Cd (27987 plus/minus 6751) scenarios. With 50% runoff, the all metals (15740 plus/minus 5455), Cu (16815 plus/minus 6263), PAH (19675 plus/minus 995), and Zn (15585 plus/minus 3097) treatme…
  note: by Leann I. Wilkins.
  note: "Major Subject: Wildlife and Fisheries Sciences"
  note: Title from author supplied metadata (automated record created 2010-08-20 08:31:34).
  note: Electronic resource.
  note: Master of Science Texas A&M University 2009 http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-630
  note: Includes bibliographical references.
  note: Text (Thesis)
  subject:
    topic: Major wildlife and fisheries sciences
  subject:
    topic: San Marcos River
  subject:
    topic: heavy metals
  subject:
    topic: Edwards Aquifer
  subject:
    topic: endangered species
  subject:
    topic: Fountain darter
  subject:
    topic: modeling
  subject:
    topic: hydrocarbons
  identifier: http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-630
  record info:
    record content source: TXA
    record creation date: 100903
    record change date: 20151201155005.0
    record identifier: in00002601644