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  1. By: O'Brien, Shannon - Facey, Douglas E.
    Type: Article
    In: The Canadian field-naturalist
    Volume: 122
    Issue: 3
    Date: 2008-07-01
    Page Range: 239--246
    Publication Info: Ottawa Ottawa Field-Naturalists' Club
  2. By: Bonfil, Ramón - O'Brien, Shannon
    Type: Article
    In: Latin american journal of aquatic research
    Date: 2015-03-01
    Publication Info: Latin american journal of aquatic research