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    Characterization of Novel Whale Shark Aggregations at Shib Habil, Saudi Arabia and Mafia Island, Tanzania

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    Name:
    Jesse Cochran Dissertation.pdf
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    1.380Mb
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    Description:
    Jesse Cochran Dissertation
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    Type
    Dissertation
    Authors
    Cochran, Jesse cc
    Advisors
    Berumen, Michael L. cc
    Committee Members
    Genton, Marc G. cc
    Jones, Burton cc
    Skomal, Greg
    Program
    Marine Science
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Date
    2014-12
    Permanent link to this record
    http://hdl.handle.net/10754/336799
    
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    Abstract
    Passive acoustic monitoring has been successfully used on many elasmobranch species, but no such study has yet been published for the whale shark (Rhincodon typus). In some ways this is surprising as the known whale shark aggregation sites would seem to be ideal targets for this method. For this dissertation, two acoustic studies were carried out in Saudi Arabia and Tanzania. Each was performed in parallel with visual surveys and the Saudi population was also studied using satellite telemetry. Sighting and acoustic data were compared at both sites, and the results were mixed. The acoustic monitoring largely confirmed the results of visual surveys for the Saudi Arabian sharks, including seasonality, residency and a degree of parity and integration between the sexes that is unique to this site. Satellite tracks of tagged Saudi sharks were used to confirm that some animals migrated away from the aggregation site before returning in subsequent seasons, confirming philopatric behavior in this species. In contrast, the acoustic results in Tanzania demonstrated year-round residency of whale sharks in the area, despite seasonal declines in visually estimated abundance. Seasonal changes in habitat selection render the sharks at this site temporarily cryptic to visual sampling. The differing results are compelling because both the philopatric behavior demonstrated in Saudi Arabia and the cryptic residency of the Tanzanian sharks could explain the seasonal patterns in whale shark abundances reported at other aggregation sites. Despite their differences, both sites in this study can be classified as secondary whale shark nurseries and each may be a vital feeding ground for its respective population.
    DOI
    10.25781/KAUST-X7N63
    Additional Links
    http://hdl.handle.net/10754/334559
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-X7N63
    Scopus Count
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    Biological and Environmental Sciences and Engineering (BESE) Division; Marine Science Program; Dissertations

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