Dataset Overview

Following the methods of Rockefeller (2016), we computed a transfer risk potential per invasive species per trailhead. For each trailhead, we computed the total number of visitors per town by summing the group size in origin data by town and trail register. Using these data, we computed a trail-town exposure score: the amount of potential exposure per species to each trailhead per town. We computed this score by multiplying the species’ total number of observations per town and the number of visitors per town. From these values, we computed a raw total exposure potential per species per trailhead by summing the trail-town exposure score across all towns. We log-transformed the raw total exposure score due to its skewed distribution and then normalized these values based on a pooled distribution of the scores across all trailheads. This resulted in transfer risk potential score per species per trailhead. It can be interpreted as the relative risk of that invasive plant species being inadvertently transported to that location.

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To link invasive plant observations summed by town, coupled with the visitor origins and trailhead destinations to examine the possible risk of plant transfer to trailheads in the Adirondack Park.

Data Collection Status

Data collection for this dataset has been completed

Start date


End date



11258 records with 6 fields

Data Availability

Available for download

Data License

CC0 - Public domain license logo

Preferred Citation

Kosiba AM and Tait E. (2020) Invasive plant transfer risk scores. FEMC. Available online at:

Update Frequency

Not planned

Maintenance Plan

Not provided


No links available for this dataset

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