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    Integrating Fisheries Dependent and Independent Approaches to assess Fisheries, Abundance, Diversity, Distribution and Genetic Connectivity of Red Sea Elasmobranch Populations

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    Name:
    Julia Spaet Dissertation.docx.pdf
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    2.096Mb
    Format:
    PDF
    Description:
    Julia Spaet Dissertation
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    Type
    Dissertation
    Authors
    Spaet, Julia L.Y. cc
    Advisors
    Berumen, Michael L. cc
    Committee members
    Irigoien, Xabier cc
    Krupp, Friedhelm
    Ravasi, Timothy cc
    Program
    Marine Science
    KAUST Department
    Biological and Environmental Science and Engineering (BESE) Division
    Date
    2014-05
    Embargo End Date
    2015-12-01
    Permanent link to this record
    http://hdl.handle.net/10754/320296
    
    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 became available to the public after the expiration of the embargo on 2015-12-01.
    Abstract
    The Red Sea has long been recognized as a global hotspot of marine biodiversity. Ongoing overfishing, however, is threatening this unique ecosystem, recently leading to the identification of the Red Sea as one of three major hotspots of extinction risk for sharks and rays worldwide. Elasmobranch catches in Saudi Arabian Red Sea waters are unregulated, often misidentified and unrecorded, resulting in a lack of species-specific landings information, which would be vital for the formulation of effective management strategies. Here we employed an integrated approach of fisheries dependent and independent survey methods combined with molecular tools to provide biological, ecological and fisheries data to aid in the assessment of the status of elasmobranch populations in the Red Sea. Over the course of two years, we conducted market surveys at the biggest Saudi Arabian fish market in Jeddah. Market landings were dominated by, mostly immature individuals - implying both recruitment and growth overfishing. Additionally, we employed baited remote underwater video (BRUVS) and longline surveys along almost the entire length of the Red Sea coast of Saudi Arabia as well as at selected reef systems in Sudan. The comparison of catch per unit effort (CPUE) data for Saudi Arabian Red Sea BRUVS and longline surveys to published data originating from non-Red Sea ocean systems revealed CPUE values several orders of magnitude lower for both survey methods in the Red Sea compared to other locations around the world. Finally, we infered the regional population structure of four commercially important shark species between the Red Sea and the Western Indian Ocean.We genotyped nearly 2000 individuals at the mitochondrial control region as well as a total of 20 microsatellite loci. Genetic homogeneity could not be rejected for any of the four species across the spatial comparison. Based on high levels of region-wide exploitation, we suggest that, for management purposes, the population structure of all four species should be considered as single stock in the three marginal seas surrounding Arabia. Overall, our combined results indicate a severe depletion of sharks in Saudi Arabian Red Sea waters, likely caused by drastic overfishing of elasmobranch populations.
    Citation
    Spaet, J. L. Y. (2014). Integrating Fisheries Dependent and Independent Approaches to assess Fisheries, Abundance, Diversity, Distribution and Genetic Connectivity of Red Sea Elasmobranch Populations. KAUST Research Repository. https://doi.org/10.25781/KAUST-K8HVO
    DOI
    10.25781/KAUST-K8HVO
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-K8HVO
    Scopus Count
    Collections
    Biological and Environmental Science and Engineering (BESE) Division; Marine Science Program; PhD Dissertations

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