在亚群体间缺乏基因流动时，群体间的遗传差异开始累积。
In the absence of gene flow between the subpopulations, genetic differences between the groups begin to accumulate.
基因流动是相对自由的，因为个体可以移动，然后在新的地方与个体交配。
Gene flow is relatively free because individuals can move and then mate with individuals in their new location.
这个变化使当地的昆虫被分隔开来，现在分居于河的两岸，彼此的基因流动已被完全截断。
The change separated populations of insects now living along opposite shore, completely cutting off gene flow between them.
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