Abstract
Paths on four islands in St Lawrence Islands National Park, Ontario were investigated to determine indicators of visitor impact Decrease in occurrence of litter and increase in frequency of introduced weeds were found to be significantly related to the number of visitors/hectare/year. Species richness was related to previous use of the islands for farming and recreation, and to access points, but not to numbers of visitors Frequency of rocky outcrops and path width varied from island to island Path width was not related to intensity of use In this park the most useful index of impact is frequency of occurrence of introduced weeds
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