Ten pig muscle samples were obtained from a Fukushima pig slaughterhouse or purchased from a Fukushima prefectural meat market in 2016. Additionally, the birth period of wild boar was approximated using sampling year and age data. GPS coordinates, sex, and estimated age based on tooth erosion patterns were recorded at the trap sites prior to sampling. Additional wild boar samples from the period prior to the 2011 evacuations, were provided by prefectural hunters, which included 25 muscle samples from a wild boar population in Ibaraki Prefecture, south of Fukushima Prefecture 10 muscle samples from Yamagata Prefecture and seven muscle samples from Miyagi Prefecture, both north of Fukushima Prefecture. The wild boar muscle samples used were collected from 191 wild boar, all of which were morphologically identified as typical wild boar in Japan, captured in or nearby the Fukushima evacuated zone from 2015 to 2018. We conclude that future risks for wild boar in this area include intraspecies competition, revitalization of human related disruptions, and disease outbreaks. Using the gene flow data among wild boar, we assume that offspring from hybrid lineages will continue dispersal north at low frequencies as climates warm. We speculate that the range expansion dynamics inhibit long-term introgression and introgressed alleles will continue to decrease at each generation while only maternally inherited organelles will persist. Concurrently, we show evidence of successful hybridization between pigs and native wild boar in this area, however in future offspring, the pig legacy has been diluted through time. Here, we demonstrate, using genetic data, how wild boar ( Sus scrofa leucomystax) have persevered against these environmental changes, including an invasion of escaped domestic pigs ( Sus scrofa domesticus). Such disasters occurred on March 11th 2011, in Fukushima, Japan when an earthquake, tsunami, and meltdown of a nuclear power plant all drastically reformed anthropogenic land use. Natural and anthropogenic disasters have the capability to cause sudden extrinsic environmental changes and long-lasting perturbations including invasive species, species expansion, and influence evolution as selective pressures force adaption.