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    Assessing sharks and rays in shallow coastal habitats using baited underwater video and aerial surveys in the Red Sea

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    Name:
    MS Thesis_Ashlie J. McIvor_Spring 2020.docx
    Size:
    5.414Mb
    Format:
    Microsoft Word 2007
    Description:
    MS Thesis
    Embargo End Date:
    2021-05-06
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    Type
    Thesis
    Authors
    Mcivor, Ashlie cc
    Advisors
    Berumen, Michael L. cc
    Committee members
    Jones, Burton cc
    Coker, Darren
    Spaet , Julia
    Program
    Marine Science
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2020-05
    Embargo End Date
    2021-05-06
    Permanent link to this record
    http://hdl.handle.net/10754/662753
    
    Metadata
    Show full item record
    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 will become available to the public after the expiration of the embargo on 2021-05-06.
    Abstract
    Years of unregulated fishing activity have resulted in low abundances of elasmobranch species in the Saudi Arabian Red Sea. Coastal populations of sharks and rays in the region remain largely understudied and may be at risk from large-scale coastal development projects. Here we aim to address this pressing need for information by using fish market, unmanned aerial vehicle and baited remote underwater video surveys to quantify the abundance and diversity of sharks and rays in coastal habitats in the Saudi Arabian central Red Sea. Our analysis showed that the majority of observed individuals were batoids, specifically blue-spotted ribbontail stingrays (Taeniura lymma) and reticulate whiprays (Himantura sp.). Aerial surveys observed a catch per unit effort two orders of magnitude greater than underwater video surveys, yet did not detect any shark species. In contrast, baited camera surveys observed both lemon sharks (Negaprion acutidens) and tawny nurse sharks (Nebrius ferrugineus), but in very low quantities (one individual of each species). The combination of survey techniques revealed a higher diversity of elasmobranch presence than using either method alone, however many species of elasmobranch known to exist in the Red Sea were not detected. Our results suggest that aerial surveys are a more accurate tool for elasmobranch abundance estimates in low densities over mangrove-associated habitats. The importance of inshore habitats, particularly for batoids, calls for a deeper understanding of habitat use in order to protect these environments in the face of unregulated fishing, mangrove removal, and anticipated developments along the coastline of the Saudi Arabian Red Sea.
    Citation
    Mcivor, A. (2020). Assessing sharks and rays in shallow coastal habitats using baited underwater video and aerial surveys in the Red Sea. KAUST Research Repository. https://doi.org/10.25781/KAUST-287I6
    DOI
    10.25781/KAUST-287I6
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-287I6
    Scopus Count
    Collections
    Biological and Environmental Sciences and Engineering (BESE) Division; Marine Science Program; Theses

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