Continued distribution, long life, predominantly outcrossing, wind pollination and high gene flow might be the main causes of low genetic differentiation of Q. variabilis populations.
连续分布、世代周期长、异交、风媒授粉以及群体间较频繁的基因交流等特性可能是导致栓皮栎群体间遗传分化小的原因。
参考来源 - 栓皮栎群体遗传结构研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Nevertheless, anecdotal reports of wind pollination in cycads cannot be ignored.
然而，一些关于苏铁风媒传粉的传闻也不容忽视。
Furthermore, the structure of most female cycad cones seems inconsistent with direct pollination by wind.
此外，大部分雌苏铁球果的结构似乎与风直接授粉不一致。
For Darwin's skepticism about the efficiency of wind pollination, see chapter 10 of Darwin, C. 1876.
有关达尔文对风媒传粉效率的持疑，见darwin, C . 1876。
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