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    Tracing the origin of olive ridley turtles entangled in ghost nets in the Maldives: A phylogeographic assessment of populations at risk

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    Authors
    Stelfox, Martin
    Burian, Alfred
    Shanker, Kartik
    Rees, Alan F.
    Jean, Claire
    Willson, Maïa S.
    Manik, Nashwa Ahmed
    Sweet, Michael
    Affiliation
    University of Derby
    Olive Ridley Project, 11 Dane Close, Bramhall, Stockport, Cheshire
    Centre for Ecological Sciences, Indian Institute of Science, Bangalore, India
    Dakshin Foundation, Bangalore, India
    University of Exeter
    Kelonia, 46 rue du General De Gaulle, 97436 Saint Leu, La Reunion, France
    Environment Society of Oman, Oman
    Environmental Protection Agency, Maldives
    Issue Date
    2020-04-07
    
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    Abstract
    Abandoned, lost or discarded fishing nets, (ghost nets) represent a major threat to marine vertebrates. However, thorough assessments of their impact on threatened species are largely missing. In the Maldives, olive ridley sea turtles (Lepidochelys olivacea) are frequently caught in ghost nets however the archipelago does not support a significant nesting population. Our aim in this study was to determine the origin of olive ridleys entangled in ghost nets found in the Maldives and evaluate potential impacts on respective source populations. Based on a citizen science and conservation program, we recorded 132 olive ridley turtles entangled in ghost nets in just one year. Genetic analyses (mtDNA) of entangled individuals and of potential source populations revealed that most captured olive ridleys originated from Sri Lanka and eastern India. Oman could be excluded as source population, even during the prevalence of the south west monsoon. Based on our results and already available published literature, we were able to estimate that the recorded ghost net entanglements accounted for a relatively small amount (0.48%) of the eastern Indian population. However, the entangled turtles accounted for a much larger percentage (41%) of the Sri Lankan populations. However, it should be noted that our estimates of population-level mortality are linked to substantial uncertainty due to the lack of reliable information on population dynamics. Consequently, any precautionary protection measures applied should be complemented with improved quantification of turtle recruitment and life-stage specific mortalities.
    Citation
    Stelfox, M., Burian, A., Shanker, K., Rees, A., F., Jean, C., Willson, M., S. Manik, N., A., and Sweet, M. (2020). ‘Tracing the origin of olive ridley turtles entangled in ghost nets in the Maldives: A phylogeographic assessment of populations at risk’. Biological Conservation, 245, pp. 1-10.
    Publisher
    Elsevier BV
    Journal
    Biological Conservation
    URI
    http://hdl.handle.net/10545/624685
    DOI
    10.1016/j.biocon.2020.108499
    Additional Links
    https://www.sciencedirect.com/science/article/abs/pii/S0006320719313874?via%3Dihub
    Type
    Article
    Language
    en
    ISSN
    0006-3207
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.biocon.2020.108499
    Scopus Count
    Collections
    Environmental Sustainability Research Centre

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