How wide is the time window for introgression after divergence? Pulido‐Santacruz et al. addressed this question by studying the evolutionary history of the bird genus Dendrocincla. They found five introgression events that occurred between a few hundred thousand and around 2.5 million years after divergence. The introgressed genomic proportion declined exponentially with the age of the hybridizing taxa. Hence, this study suggests that species boundaries are permeable up to 2.5 million years after divergence.

中文翻译：

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摘要：鸟类基因组可以渗透数百万年

分歧后基因渗入的时间窗口有多宽？Pulido-Santacruz 等。通过研究鸟类属 Dendrocincla 的进化史解决了这个问题。他们发现了在分化后的几十万年到约 250 万年之间发生的五个基因渗入事件。基因组渗入的比例随着杂交分类群的年龄呈指数下降。因此，这项研究表明物种边界在分化后长达 250 万年是可渗透的。