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/ Various types of recreational traffic impact hiking trails uniquely and cause different levels of trail degradation; however, trail head restrictions are applied similarly across all types of packstock. The purpose of this study was to assess the relative physical impact of hikers, llamas, and horses on recreational trails. Horse, llama, and hiker traffic were applied to 56 separate plots on an existing trail at Lubrecht Experimental Forest in western Montana. The traffic was applied to plots at intensities of 250 and 1000 passes along with a no-traffic control under both prewetted and dry trail conditions. Soil erosion potential was assessed by sediment yield and runoff (using a Meeuwig type rainfall simulator), changes in soil bulk density, and changes in soil surface roughness. Soil moisture, slope, and rainfall intensity were recorded as independent variables in order to evaluate the extent that they were held constant by the experimental design. Horse traffic consistently made more sediment available for erosion from trails than llama, hiker, or no traffic when analyzed across wet and dry trail plots and high and low intensity traffic plots. Although total runoff was not significantly affected by trail user, wet trail traffic caused significantly greater runoff than dry trail traffic. Llama traffic caused a significant increase in sediment yield compared to the control, but caused erosion yields not significantly different than hiker traffic. Trail traffic did not increase soil compaction on wet trails. Traffic applied to dry trail plots generally resulted in a significant decrease in soil bulk density compared to the control. Decreased soil bulk density was negatively correlated with increased sediment yield and appeared to result in increased trail roughness for horse traffic compared to hiker or llama traffic. Differences described here between llama and horse traffic indicate that trail managers may want to consider managing packstock llamas independent of horses.KEY WORDS: Recreational impacts; Sediment yield; Trail degradation

The purpose of this study was to test the validity of the new Tourism Autobiographical Memory Scale (TAMS) that measures visitor experience through personal memory. The TAMS uses the autobiographical memory framework to represent the degree to which a travel experience was impactful to a traveler’s life. Visitors were asked to recall a memory from their visit to a national park and rate the memory of the experience based on its impact and frequency of rehearsal on a 7-point scale. Using exploratory factor analysis and reliability testing, two distinct factors emerged. Results identified a reliable measure of a memory’s impact and frequency of rehearsal of tourists. The TAMS provides researchers a new scale to gather information about the impact of a visitor experience from the direct source—personal memories. Destination managers who understand the impact they can have on a traveler will be able to manage and market to those types of experiences.