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    Thermal Responses of Growth and Toxin Production in Four Prorocentrum Species from the Central Red Sea

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    MS+Thesis_Arwa+Aynousah_Summer+2017.pdf
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    Description:
    MS Thesis - Arwa Aynousah
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    Type
    Thesis
    Authors
    Aynousah, Arwa cc
    Advisors
    Agusti, Susana cc
    Committee members
    Duarte, Carlos M. cc
    Moran, Xose Anxelu G. cc
    Program
    Bioscience
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2017-06
    Embargo End Date
    2018-06-21
    Permanent link to this record
    http://hdl.handle.net/10754/625126
    
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    Access Restrictions
    At the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis became available to the public after the expiration of the embargo on 2018-06-21.
    Abstract
    Harmful algae studies, in particular toxic dinoflagellates, and their response to global warming in the Red Sea are still limited. This study was aimed to be the first to characterize the identity, thermal responses and toxin production of four Prorocentrum strains isolated from the Central Red Sea, Saudi Arabia. Morphological and molecular phylogenetic analysis identified the strains as P. elegans, P. rhathymum and P. emarginatum. However, the identity of strain P. sp.6 is currently unresolved, albeit sharing close affinity with P. leve. Growth experiments showed that all species could grow at 24-32°C, but only P. sp.6 survived the 34°C treatment. The optimum temperatures (Topt) estimated from the Gaussian model corresponded to 27.17, 29.33, 26.87, and 27.64°C for P. sp.6, P. elegans, P. rhathymum and P. emarginatum, respectively. However, some discrepancy with the Topt derived from the growth performance were observed for P. elegans and P. emarginatum, as thermal responses differed from the typical Gaussian fit. The Prorocentrum species examined showed a sharp decrease after the optimum temperature resulting in very high activation energies for the fall slope, especially for P. elegans and P. emarginatum. The minimum critical temperature limit for growth was not detected within the range of temperatures examined. Subsequently, high performance liquid chromatography coupled with mass spectrometry (HPLC-MS) analysis revealed all species as non okadaic acid (OA, common toxin of the Prorocentrum genus) producers at any temperature treatment. However, other forms of toxin (i.e. fast acting toxins) not examined here could be produced. Therefore, further investigations are required. The results of this study provided significant contribution to our knowledge regarding the presence, thermal response and toxin production of four Prorocentrum species from the Central Red Sea, Saudi Arabia.
    Citation
    Aynousah, A. (2017). Thermal Responses of Growth and Toxin Production in Four Prorocentrum Species from the Central Red Sea. KAUST Research Repository. https://doi.org/10.25781/KAUST-L41ST
    DOI
    10.25781/KAUST-L41ST
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-L41ST
    Scopus Count
    Collections
    Biological and Environmental Sciences and Engineering (BESE) Division; Bioscience Program; Theses; Theses

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