...另一个难题是难于区分自然选择和人口学(demography)事件,例如种群扩散(population expansion)、瓶颈效应(population bottlenecks)、群体结构(population structure)等因素所产生的效应。所以,关于自然选择对人类基因组变异的影响,依然众说纷纭,莫衷一是。
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Population bottlenecks can have the same effect.
人口瓶颈具有相同的效应。
Population bottlenecks can have the same effect .
种群瓶颈可能有同样的效果。
One is to look for evidence of population bottlenecks in other species, especially animals that were not hunted by the Clovis people.
第一种是在其它物种身上找到同样存在种群数瓶颈的证据，尤其是那些没有被克洛维斯人猎杀过的物种。
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