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首页> 外文期刊>Molecular ecology >The population demography of Betula maximowicziana, a cool-temperate tree species in Japan, in relation to the last glacial period: its admixture-like genetic structure is the result of simple population splitting not admixing
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The population demography of Betula maximowicziana, a cool-temperate tree species in Japan, in relation to the last glacial period: its admixture-like genetic structure is the result of simple population splitting not admixing

机译：日本上温带树木Betula maximowicziana的种群人口统计学与上一个冰期的关系：其类似混合物的遗传结构是简单的种群分裂而不是混杂的结果

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Conservation of the local genetic variation and evolutionary integrity of economically and ecologically important trees is a key aspect of studies involving forest genetics, and a population demographic history of the target species provides valuable information for this purpose. Here, the genetic structure of 48 populations of Betula maximowicziana was assessed using 12 expressed sequence tag-simple sequence repeat (EST-SSR) markers. Genetic diversity was lower in northern populations than southern ones and structure analysis revealed three groups: northern and southern clusters and an admixed group. Eleven more genomic-SSR loci were added and the demographic history of these three groups was inferred by approximate Bayesian computation (ABC). The ABC revealed that a simple split scenario was much more likely than isolation with admixture, suggesting that the admixture-like structure detected in this species was due to ancestral polymorphisms. The ABC analysis suggested that the population growth and divergence of the three groups occurred 96800 (95% CI, 20500-599000) and 28300 (95% CI, 8700-98400) years ago, respectively. We need to be aware of several sources of uncertainty in the inference such as assumptions about the generation time, overlapping of generations, confidence intervals of the estimated parameters and the assumed model in the ABC. However, the results of the ABC together with the model-based maps of reconstructed past species distribution and palaeoecological data suggested that the modern genetic structure of B.maximowicziana originated prior to the last glacial maximum (LGM) and that some populations survived in the northern range even during the LGM.
机译：保护具有经济和生态重要性的树木的局部遗传变异和进化完整性是涉及森林遗传学的研究的一个关键方面，目标物种的人口统计历史为此提供了宝贵的信息。在这里，使用12个表达的序列标签-简单序列重复（EST-SSR）标记评估了桦木桦48个种群的遗传结构。北部种群的遗传多样性低于南部种群，结构分析显示了三类：北部和南部集群以及一个混合群体。添加了11个以上的基因组SSR基因座，并通过近似贝叶斯计算（ABC）推断了这三组的人口统计学历史。美国广播公司（ABC）透露，一个简单的分裂场景比用混合物分离的可能性要大得多，这表明在该物种中检测到的类似混合物的结构是由于祖先的多态性造成的。 ABC分析表明，这三组人口的增长和分歧分别发生在96800年（95％CI，20500-599000）和28300（95％CI，8700-98400）年前。我们需要知道推理中的不确定性的多种来源，例如关于生成时间的假设，生成的重叠，估计参数的置信区间以及ABC中的假定模型。但是，ABC的结果以及重建的过去物种分布和古生态数据的基于模型的图谱表明，B.maximowicziana的现代遗传结构起源于最后一个冰期最大值（LGM）之前，并且一些种群在北部生存了下来。范围甚至在LGM期间也是如此。

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