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  • Excess of unpaired males in one of the World's most endangered seabirds, the Chatham Island taiko Pterodroma magentae

    Author(s)
    Lawrence, HA
    Millar, CD
    Taylor, GA
    Macdonald, LD
    Lambert, DM
    Griffith University Author(s)
    Lambert, David M.
    Year published
    2008
    Metadata
    Show full item record
    Abstract
    The Chatham Island taiko Pterodroma magentae (tchaik) is one of the World's most endangered seabirds with a population size of between 120-150 individuals that includes only 8-15 breeding pairs. Molecular techniques were used to identify the sex of taiko, which is difficult to assign morphologically. Blood samples were obtained from almost the entire known living population and from some birds now thought to be dead. We report an approximately even sex ratio in taiko chicks and adults associated with breeding burrows, but a large male-biased ratio in non-breeding adult birds caught on the ground. This finding suggests that ...
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    The Chatham Island taiko Pterodroma magentae (tchaik) is one of the World's most endangered seabirds with a population size of between 120-150 individuals that includes only 8-15 breeding pairs. Molecular techniques were used to identify the sex of taiko, which is difficult to assign morphologically. Blood samples were obtained from almost the entire known living population and from some birds now thought to be dead. We report an approximately even sex ratio in taiko chicks and adults associated with breeding burrows, but a large male-biased ratio in non-breeding adult birds caught on the ground. This finding suggests that unpaired males may be having difficulty in attracting females to burrows and that this situation may be an example of the Allee effect, that reduced density of potential mates acts to decrease population productivity. Identification of the sex of taiko using a molecular technique has important implications for the conservation management of this critically endangered species, including the future transfer of taiko chicks to a predator-excluded breeding site.
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    Journal Title
    Journal of Avian Biology
    Volume
    39
    Issue
    3
    DOI
    https://doi.org/10.1111/j.0908-8857.2008.04272.x
    Subject
    Biological sciences
    Molecular evolution
    Agricultural, veterinary and food sciences
    Publication URI
    http://hdl.handle.net/10072/26449
    Collection
    • Journal articles

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