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    Responses of symbiotic cnidarians to environmental change

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    Name:
    Marcela Herrera Sarrias Dissertation.pdf
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    50.77Mb
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    PDF
    Description:
    Marcela Herrera Sarrias Dissertation
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    Type
    Dissertation
    Authors
    Herrera Sarrias, Marcela cc
    Advisors
    Aranda, Manuel cc
    Committee members
    Merzaban, Jasmeen cc
    Voolstra, Christian R. cc
    Sweet, Michael
    Program
    Marine Science
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2019-11
    Embargo End Date
    2020-12-10
    Permanent link to this record
    http://hdl.handle.net/10754/660503
    
    Metadata
    Show full item record
    Access Restrictions
    At the time of archiving, the student author of this dissertation opted to temporarily restrict access to it. The full text of this dissertation will become available to the public after the expiration of the embargo on 2020-12-10.
    Abstract
    As climate change intensifies, the capacity of organisms to adapt to changing environments becomes increasingly relevant. Heat-induced coral bleaching –the breakdown of the symbiotic association between coral hosts and photosynthetic algae of the family Symbiodiniaceae– is rapidly degrading reefs worldwide. Hence, there is a growing interest to study symbioses that can persist in extreme conditions. The Red Sea is such a place, known as one of the hottest seas where healthy coral reef systems thrive. Here (Chapter 1), we tested the potential of symbiont manipulation as means to improve the thermal resilience of the cnidarian holobiont, particularly using heat tolerant symbiont species from the Red Sea. We used clonal lineages of the model system Aiptasia (host and symbiont), originating from different thermal environments to assess how interchanging either partner affected their short- and long-term performance under heat stress. Our findings revealed that symbioses are not only intra-specific but have also adapted to native, local environments, thus potentially limiting the acclimation capacity of symbiotic cnidarians to climate change. As such, infection with more heat resistant species, even if native, might not necessarily improve thermotolerance of the holobiont. We further investigated (Chapter 2) how environment-dependent specificity, in this case elevated temperature, affects the establishment of novel symbioses. That is, if Aiptasia hosts are, despite exhibiting a high degree of partner fidelity, capable of acquiring more thermotolerant symbionts under stress conditions. Thus, we examined the infection dynamics of multi-species symbioses under different thermal environments and assessed their performance to subsequent heat stress. We showed that temperature, more than host identity, plays a critical role in symbiont uptake and overall performance when heatchallenged. Additionally, we found that pre-exposure to high temperature plays a fundamental role in improving the response to thermal stress, yet, this can be heavily influenced by other factors like feeding. Like climate change, ocean acidification is a serious threat to corals. Yet, most research has focused on the host and little is known for the algal partner. Thus, here we studied (Chapter 3) the global transcriptomic response of an endosymbiotic dinoflagellate to long-term seawater acidification stress. Our results revealed that despite observing an enrichment of processes related to photosynthesis and carbon fixation, which might seem beneficial to the symbiont, low pH has a detrimental effect on its photo-physiology. Taken together, this dissertation provides valuable insights into the responses of symbiotic cnidarians to future climate and ocean changes.
    Citation
    Herrera Sarrias, M. (2019). Responses of symbiotic cnidarians to environmental change. KAUST Research Repository. https://doi.org/10.25781/KAUST-J5LV9
    DOI
    10.25781/KAUST-J5LV9
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-J5LV9
    Scopus Count
    Collections
    Biological and Environmental Sciences and Engineering (BESE) Division; Marine Science Program; Dissertations

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