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    Untangling the origin of ghost gear within the Maldivian archipelago and its impact on olive ridley (Lepidochelys olivacea) populations

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    Authors
    Stelfox, M
    Bulling, M
    Sweet, M
    Affiliation
    University of Derby
    Olive Ridley Project, Cheshire
    Issue Date
    2019-12-12
    
    Metadata
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    Abstract
    There is little documentation available on the impact of abandoned, lost or discarded fishing nets (‘ghost nets’) on turtle populations. Here, we utilise data collected over a 5 year period to assess (1) if a particular net type or characteristic was identifiable as entangling more turtles and (2) if particular fishing practices (i.e. types of nets) could be managed to reduce turtle entanglement in the Maldivian archipelago. A total of 131 turtles were entangled in the 752 reported ghost nets, and olive ridley turtles Lepidochelys olivacea appeared to be the most vulnerable (making up 97% of entangled turtles). However, we estimate that the 752 nets in this study, reported over a 51 month period, could have entangled between 3400 and 12200 turtles across the Indian Ocean prior to being detected in the Maldives. Mesh size, seasonality (i.e. north east monsoon), and the presence of floats were all identified as variables significantly affecting the likelihood of turtle entanglement. The probability of entanglement increased as the mesh size increased but decreased when floats were present. Additionally, turtles were more likely to be entangled during the north east monsoon when currents flow from east to west. Cluster analysis indicated that there were at least 11 broadly assigned net types found floating in the study area, and these were dominated by trawl and gill nets. Our analyses highlight the need for a detailed database of existing gear types coupled with gear marking to improve traceability of ghost nets in the Indian Ocean.
    Citation
    Stelfox, M., Bulling, M., and Sweet, M. (2019). 'Untangling the origin of ghost gear within the Maldivian archipelago and its impact on olive ridley (Lepidochelys olivacea) populations'. Endangered Species Research, 40, pp. 309-330. DOI: 0.3354/esr00990
    Publisher
    Inter-Research Science Center
    Journal
    Endangered Species Research
    URI
    http://hdl.handle.net/10545/624404
    DOI
    10.3354/esr00990
    Additional Links
    https://www.int-res.com/abstracts/esr/v40/p309-320/
    Type
    Article
    Language
    en
    ISSN
    1863-5407
    1613-4796
    ae974a485f413a2113503eed53cd6c53
    10.3354/esr00990
    Scopus Count
    Collections
    Environmental Sustainability Research Centre

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