Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleIs mean litter size the most productive? A test in Columbian ground squirrels.AuthorsRisch, Thomas S.; Dobson, F. StephenAbstractStudies the productivity of mean litter size in Columbian ground squirrels. Lack's hypothesis; Individual optimization; Cliff-edge hypothesis; Bad-year effect; Costs of reproduction.SubjectsGROUND squirrels; REPRODUCTIONPublicationEcology, 1995, Vol 76, Issue 5, p1643ISSN0012-9658Publication typeArticleDOI10.2307/1938165