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    Acute toxicity of the oil dispersant corexit 9500, and fresh and weathered Alaska North Slope crude oil to the Alaskan tanner crab (C. Bairdi), two standard test species, and V. fischeri (MICROTOX Assay)

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    Rhoton.Sara. 1999.pdf
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    Author
    Rhoton, Sara Louise
    Keyword
    Tanner crabs
    Effect of oil spills on
    Alaska
    Petroleum
    Toxicology
    Dispersing agents
    Oil spills and wildlife
    Oil pollution of the sea
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/11122/5027
    Abstract
    Toxicity assays of the oil dispersant Corexit 9500, and fresh and weathered Alaska North Slope (ANS) crude oil were conducted on Alaskan tanner crab larvae (Chionoecetes bairdi) under cold-region conditions, the reference species, Mysidopsis bahia and Menidia beryllina, and Vibrio fischeri (Microtox bioassay). Acute 96-hour toxicity data for C. bairdi were calculated using the response 'affected' (decreased phototactic response and ability to swim). C. bairdi were most sensitive to non-dispersed weathered oil (EC₅₀=0.4 mg/L), least to dispersant-only solutions (EC₅₀=1,267 mg/L), and were typically more sensitive than the reference species. Dispersant-only solutions were consistently least toxic for all species tested. Dispersed fresh oil was frequently more toxic than non-dispersed oil. Weathered oil data are greatly influenced by aqueous solubilities, indicating non-dispersed weathered oil was most toxic, although those solutions required the highest oil loading (25 g/L). Interpretations of toxicity data are dependent upon expression of solution concentrations.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 1999
    Date
    1999-12
    Type
    Thesis
    Collections
    Marine Biology

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