Each symbol is a colony, and the size of the symbol is how many offspring it had, because we were able to use genetic variation to match up parent and offspring colonies, that is, to figure out which colonies were founded by a daughter queen produced by which parent colony.
每一个圆圈都表示一个种群， 圆圈的大小表示后代的规模， 我们可以通过基因变化分析 来确认种群之间的父子关系， 也就是能够确认每个蚁群 里面的蚁后来自于 哪个父代蚁群。