Small, medium and large mammalian herbivory was evaluated on young (seedlings and saplings) Fremont cottonwood tree on two sites (Green River in Northeastern Utah and Yampa River in Northwestern Colorado). Mammals present were evaluated by capture-recapture (unpublished) in these areas. Large and small exclosures were established at each site to exclude combinations of small, medium, large mammals, and controls. Cottonwood sapling survivorship and growth was measured to assess the effects from the three classes of mammals.
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