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    The Effects of Temperature on Microcystin-LR Toxicity to Bosmina Longirostris: Food Web Implications in the Chowan River, North Carolina

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    Author
    Jupitz, Madison C
    Abstract
    In the Chowan River, North Carolina, the frequency of Microcystis aeruginosa blooms has increased over recent years with an average 1.9°C rise in June water temperatures since 1975. Zooplankton are an important trophic link for toxins to move up the food web. Bosmina longirostris, a dominant zooplankton in the Chowan River, consumes toxic M. aeruginosa cells. This study aimed to understand how microcystin-LR, produced from M. aeruginosa blooms, affects B. longirostris mortality under increasing temperatures. B. longirostris were resistant to microcystin-LR, demonstrating an LC50 of 26.3 [mu]g/L. Therefore B. longirostris can survive typical bloom microcystin-LR concentrations ranging less than 0.1 [micro]g/L to 2.0 [mu]g/L. As temperatures were increased from 25°C to 35°C, microcystin-LR mortality increased approximately 18% from 25-27°C; demonstrating that microcystin-LR was more toxic with increasing temperatures. Above 27°C, mortality also increased, but this was due to the effect of temperature rather than increased toxicity of microcystin-LR. This signifies that during spring, when temperatures are below 27°C and B. longirostris are most abundant, microcystin-LR may be most toxic and may have the greatest influence on the Chowan River food web. Under climate change conditions microcystin-LR may eliminate resistant zooplankton from the food web, putting pressure on larval fish and fisheries.
    URI
    http://hdl.handle.net/10342/6387
    Subject
     Microcystin-LR; Bosmina longirostris 
    Date
    2017-07-13
    Citation:
    APA:
    Jupitz, Madison C. (July 2017). The Effects of Temperature on Microcystin-LR Toxicity to Bosmina Longirostris: Food Web Implications in the Chowan River, North Carolina (Master's Thesis, East Carolina University). Retrieved from the Scholarship. (http://hdl.handle.net/10342/6387.)

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    MLA:
    Jupitz, Madison C. The Effects of Temperature on Microcystin-LR Toxicity to Bosmina Longirostris: Food Web Implications in the Chowan River, North Carolina. Master's Thesis. East Carolina University, July 2017. The Scholarship. http://hdl.handle.net/10342/6387. March 08, 2021.
    Chicago:
    Jupitz, Madison C, “The Effects of Temperature on Microcystin-LR Toxicity to Bosmina Longirostris: Food Web Implications in the Chowan River, North Carolina” (Master's Thesis., East Carolina University, July 2017).
    AMA:
    Jupitz, Madison C. The Effects of Temperature on Microcystin-LR Toxicity to Bosmina Longirostris: Food Web Implications in the Chowan River, North Carolina [Master's Thesis]. Greenville, NC: East Carolina University; July 2017.
    Collections
    • Biology
    • Master's Theses
    • North Carolina Collection
    Publisher
    East Carolina University

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