Assessment of barriers to gene flow in S. hesperis
A partial mantel test indicated that lineage distance (same vs.
different lineage) was not significantly related to resistance distance
(r = -0.111; p = 0.987) after partialling out the
relationship between lineage distance and Euclidean distance. This
result suggests that, although dispersing individuals of each lineage
are less likely to contact individuals of the other lineage, this is
best attributed to the geographic separation of the ranges of the
lineages (i.e., parapatry) and not to arrangements of suitable habitat
that might present significant barriers to dispersal.