1. 亚种群：subpopulation 亚族群 | subspecies 亚种群 | substhermocline 下层水温跃层

2. 地理亚种：Cline渐变群 | Subspecies地理亚种 | Natural selection自然选择

noun

1. (biology) a taxonomic group that is a division of a species
usually arises as a consequence of geographical isolation within a species

Synonym: race