H) and mitochondrial DNA analyses, we examined 66 carcasses from four wintering sites in Korea. Feather δ²H values did not differ significantly among wintering sites, and isoscape-based assignment revealed broadly overlapping breeding origins around the Mongolia-Russia and China-Russia border regions. No clear latitudinal trend in breeding origins was detected, suggesting the absence of chain migration. Adults consistently had higher δ²H values than first-winter individuals, likely reflecting age-related differences in molt timing and location. Genetic analyses revealed high intermixing among wintering populations, with no evidence of distinct population structure. Together, these findings suggest that Korean wintering rooks constitute a diffuse population, implying that localized lethal control is unlikely to be effective. Non-lethal strategies, including habitat modification, alternative roosting sites, and deterrence measures, should be prioritized to mitigate conflicts.
Kim et al. (Tue,) studied this question.