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By: Sears, Hilary J. - Theberge, John B - Theberge, Mary T. - Thornton, Ian - Campbell, G. DouglasType: ArticleIn: The Canadian field-naturalistVolume: 117Series:Issue: 4Date: 2003-10-01Page Range: 589--600Publication Info: Ottawa Ottawa Field-Naturalists' ClubSubjects: