Contributions of multiple refugia during the last glacial period to current mainland populations of Korean pine (Pinus koraiensis).
Contributions of multiple refugia during the last glacial period to current mainland populations of Korean pine (Pinus koraiensis).
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末次冰河期的多重庇护所对目前大陆红松种群的贡献
DOI：
10.1038/srep18608
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发表时间：
2015-12-22
影响因子：
4.6
通讯作者：
Ge J
中科院分区：
文献类型：
--
作者：
Bao L;Kudureti A;Bai W;Chen R;Wang T;Wang H;Ge J
末次盛冰期（LGM）期间存在的北方微避难所是物种人口历史的关键因素。红松在东北亚地区有着独特的分布。长白山和朝鲜半岛（CM/KP）是红松的末次盛冰期避难所。然而，小兴安岭（XR），在该物种的分布北方的一部分，是另一个可能的避难所。利用叶绿体测序和10个核单拷贝基因位点分析了红松的遗传多样性。基于近似贝叶斯计算，计算了单个LGM避难所和多个LGM避难所的概率。纬度梯度对遗传多样性的影响不显著。然而，独特的等位基因出现在低频率的CM/KP和XR。保守估计CM/KP和XR之间的合并时间是40万年前，早于LGM。据估计，CM/KP和XR之间的基因流在每代中超过一个，这个量可能足以限制区域之间的遗传分化。我们的研究强烈支持XR是除了CM/KP之外的另一个LGM避难所的假设。
The northern microrefugia that existed during the Last Glacial Maximum (LGM) are a key factor in the demographic history of species. Pinus koraiensis has a unique distribution in northeast Asia. The Changbai Mountains and the Korean peninsula (CM/KP) are usually considered to be the LGM refugia for P. koraiensis. However, the Xiaoxingan Range (XR), at the northern part of this species’ distribution, is another possible refugium. We used chloroplast sequencing and ten nuclear single-copy gene loci to calculate the genetic diversity pattern of P. koraiensis. The probabilities of a single LGM refugium and of multiple LGM refugia were calculated based on approximate Bayesian computation. The effect of the latitudinal gradient on genetic diversity was not significant. However, unique alleles occurred at low frequencies in CM/KP and XR. A conservative estimate of the coalescence time between CM/KP and XR is 0.4 million years ago, a time prior to the LGM. Gene flow between CM/KP and XR was estimated to be more than one in per generation, an amount that may be sufficient to limit genetic divergence between the regions. Our study strongly supports the hypothesis that XR was another LGM refugium in addition to CM/KP.