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    Hybridisation among coral reef fishes at Christmas Island and the Cocos (Keeling) Islands

    212915_140040_Hobbs_and_Allen_2014_RBZ_Cocos_Xmas_hybrids.pdf (2.940Mb)
    Access Status
    Open access
    Authors
    Hobbs, Jean-Paul
    Allen, G.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Hobbs, J. and Allen, G. 2014. Hybridisation among coral reef fishes at Christmas Island and the Cocos (Keeling) Islands. Raffles Bulletin of Zoology. Supplement 30: pp. 220-226.
    Source Title
    Raffles Bulletin of Zoology
    ISSN
    0217-2445
    School
    Department of Environment and Agriculture
    Remarks

    Copyright © 2014 National University of Singapore

    URI
    http://hdl.handle.net/20.500.11937/26586
    Collection
    • Curtin Research Publications
    Abstract

    Hybridisation is common among terrestrial and freshwater species, but is considered rare and insignificant in marine systems. Christmas and Cocos (Keeling) Islands represent a recently discovered marine suture zone that contains a high number of hybridising coral reef fishes. In this study we document a further eight species that are hybridising, bringing the total number of reported hybrid crosses to 15, involving 27 species across eight families. So far, eight of the 15 hybrid crosses have been genetically confirmed. There is a taxonomic bias to this hybridisation,with chaetodontids and acanthurids containing the greatest number of hybridising species. Hybridisation commonly involves Indian and Pacific Ocean sister species that are coming into secondary contact. In most cases, at least one parent species is rare and the lack of conspecific partners is leading to the formation of heterospecific social groups and the breakdown of assortative mating. The discovery of this hybrid hotspot provides a unique and importantopportunity to examine speciation in the marine environment.

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