Percentiles are the preferable measure for reporting dispersal distances
because dispersal curves are usually skewed and leptokurtic in
shape. However, we found percentiles were not commonly reported
and the value of the maximum percentile reported varied, usually as
the 90th, 95th or 99th percentiles. Therefore, we collected mean and
maximum dispersal distances, which were more widely reported, preferentially
from text or tables; otherwise, data were extracted from
graphs using DataThief III (B. Tummers 2006; http://datathief.org/).