| exotic grasses and feces deposition by an exotic herbivore combine to reduce the relative abundance of native forbs. | increased resource availability can facilitate establishment of exotic plant species, especially when coincident with propagule supply. following establishment, increased resource availability may also facilitate the spread of exotic plant species if it enhances their competitive abilities relative to native species. exotic canada geese (branta canadensis) introduce both exotic grass seed and nutrients to an endangered plant community on the gulf islands of southwestern british columbia, canada. ... | 2008 | 18781332 |