By cross-breeding with our native red deer, the sika deer have affected the gene pool.梅花鹿通过与我们本土的马鹿杂交，已经影响了鹿群的基因库。They share a common gene pool.他们共用一个基因库。By crossbreeding with our native red deer, the sika deer have affected the gene pool.通过与我们本地的赤鹿杂交，梅花鹿的基因库已经发生了改变。