Hybridisation and introgression.
A study was conducted to determine the level of hybridization and introgression between native red deer (Cervus elaphus) and introduced wapiti (C. elaphus canadensis) and sika deer (C. nippon) in Scotland, UK. The mitochondrial DNA of 2943 animals was analysed during 2003-2012. It was shown that the introgression between native red deer and wapiti was low, while that between red deer and sika deer was much higher. In conclusion, although the levels of hybridization between these species is low, these results will still be of significant for deer management in Scotland.