Table 2 Frequency of hybrid (H1) haplotype detection before FDNPP accident and after (2014–2018) partitioned by initial evacuation zones (<20 km), Difficult-to-Return to zones (20–40 km), and non-evacuated areas (>40 km).

From: Mating of escaped domestic pigs with wild boar and possibility of their offspring migration after the Fukushima Daiichi Nuclear Power Plant accident

Distance from NPP (km)Number of samplesH1 (%)Year (number hybrids detected)
2006–2011 (before accident)20142015201620172018
<2020713 (6.2%)0015 (1)52 (5)17 (0)123 (7)
20–40292 (6.9%)001 (0)14 (2)014 (2)
40 <1021 (0.1%)46 (0)9 (0)14 (0)18 (0)4 (0)11 (1)
All33818 (5.3%)46 (0)9 (0)30 (1)84 (7)21 (0)148 (10)