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    Bacteria associated with paralytic shellfish toxin-producing strains of Anabaena circinalis

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    Raudonis_Renee_12-2007.pdf
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    Author
    Raudonis, Renee Alaine
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    URI
    http://hdl.handle.net/11122/4924
    Abstract
    Paralytic shellfish toxins (PSTs) are produced by dinoflagellates and cyanobacteria. There is growing evidence that bacteria associated with dinoflagellates play a role in the production of PSTs, however, no studies have examined the type of bacteria associated with toxic cyanobacteria or the role these bacteria could play in PST-production or metabolism. Further, there are no known axenic cultures of PST-producing cyanobacteria, suggesting that cyanobacteria are dependent on one or more bacteria for growth/survival. The research reported here examined the bacterial community associated with six Australian freshwater cyanobacterial strains of Anabaena circinalis obtained from the CSIRO, three toxic and three non-toxic. The goal was to identify bacteria that could be essential for cyanobacterial growth/survival and/or PST production/metabolism. Confirmation of cyanobacterial species identification was confirmed by molecular techniques; one species was found to be more closely related to Anabaena flos-aquae. PST-production by the three toxic strains was confirmed using HPLC. Bacterial communities associated with the cyanobacteria were dominated by the [alpha]-Proteobacteria, of which the Rhizobiales group was dominant. Two bacterial ribotypes were associated with only the toxic cyanobacteria, and could be important in PST-remineralization.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2007
    Table of Contents
    1. Introduction -- 2. Molecular identification and production of paralytic shellfish toxins (PSTs) by six strains of Anabaena circinalis -- 3. Bacteria associated with paralytic shellfish toxin-producing strains of Anabaena circinalis -- 4. Conclusions and future directions -- Appendices.
    Date
    2007-12
    Type
    Thesis
    Collections
    Marine Sciences

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