Data from: Population structure, ancestral admixture, gene flow, and landscape association of blacklegged ticks during range expansion in the Midwestern U.S.

42 populations totalling 517 individuals of Ixodes scapularis from
different spatial locations were sampled and sequenced to study the
neutral variation, population structure, ancestral admixture, genetic
connectivity, and landscape influences on gene flow. We began with genomic
data preprocessing, variant calling, variant filtering and concordance
check. Then we used the finalized dataset in variant call format (VCF) and
spatial locations to conduct genetic distance statistics, isolation by
distance modeling and calculate summary statstics. Further we used VCF and
sample metadata to conduct Pincipal Component analysis and clustering
analysis for understanding population structure and ancestral admixture.
To understand region-wide gene flow connectivity, we conducted effective
migration surface analysis and graph network analyses to visualize
dispersal route and extent. Lastly, we processed landscape and ecological
data to conduct landscape genomic analyses to understand the impact of
landscape on gene flow, and visualized routes of dispersal across
favorable environmental conditions.