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  1. By: Stronen, Astrid Vik - Paquet, Paul C. - Herrero, Stephen - Sharpe, Seán - Waters, Nigel
    Type: Article
    In: The Canadian field-naturalist
    Volume: 121
    Issue: 2
    Date: 2007-04-01
    Page Range: 155--163
    Publication Info: Ottawa Ottawa Field-Naturalists' Club