再假设，种群迁往一个地方——如尼罗河上游，那里的人的特点是身材高大。
Suppose this population migrates to a region, like the Upper Nile, where it is an advantage to be very tall.
这些自然和人为的特点似乎能增加种群的局部瓶颈和灭绝的频率。
Such natural and anthropogenic characteristics are likely to increase the frequency of local bottlenecks and extinctions.
生物学家们还预测，即使地理上隔离开的种群又返回到同一个地方，这些行为特点仍可能保持端始种分离，但是这方面的例子仍然十分少见。
Biologists have also predicted that these kinds of behavioral traits may keep incipient species separate even when geographically isolated populations somehow wind up back in the same place.
应用推荐