Spatial Genetic Patterns and Distribution Dynamics of the Rare Oak Quercus chungii: Implications for Biodiversity Conservation in Southeast China
Spatial Genetic Patterns and Distribution Dynamics of the Rare Oak Quercus chungii: Implications for Biodiversity Conservation in Southeast China
复制标题
珍稀橡树栎的空间遗传模式和分布动态：对中国东南部生物多样性保护的启示
DOI：
10.3390/f10090821
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发表时间：
2019-09-01
期刊：
影响因子：
2.9
通讯作者：
Deng, Min
中科院分区：
文献类型：
--
作者：
Jiang, Xiao-Long;Xu, Gangbiao;Deng, Min
快速变化的气候和频繁的人类活动影响着森林的分布和群落结构。增加对树木遗传多样性和分布格局的了解，有助于森林保护和管理。本研究将核简单序列重复序列(NSSR)与物种分布模型相结合，研究了中国东南部热带珍稀栎种--中国栎属的空间遗传格局和分布动态。利用9个nSSR对分布于不同自然区域的11个种群的188个个体进行了基因分型。结构分析表明，所有居群均存在遗传混合现象，但居群的遗传变异和遗传分化与其地理分布有关。SDM分析结果表明，在末次冰盛期(LGM)，昆明栎退居到南岭及邻近地区，这与该地区种群具有较高的遗传多样性相对应。景观成因分析表明，南岭在第四纪的冰期和间冰期是生物扩散的走廊。基于这些结果，我们建议建立自然保护区，保护南岭生态廊道，这是保护区域物种遗传多样性和中国南部常绿阔叶林生态系统的必要措施。这项研究结合了物种分布模型和遗传多样性，为未来气候变化下的生物多样性保护和森林管理提供了新的见解。
A rapidly changing climate and frequent human activity influences the distribution and community structure of forests. Increasing our knowledge about the genetic diversity and distribution patterns of trees is helpful for forest conservation and management. In this study, nSSRs (nuclear simple sequence repeats) were integrated with a species distribution model (SDM) to investigate the spatial genetic patterns and distribution dynamics of Quercus chungii F.P.Metcalf, a rare oak in the subtropics of southeast China. A total of 188 individuals from 11 populations distributed across the natural range of Q. chungii were genotyped using nine nSSRs. The STRUCTURE analysis indicated that genetic admixture was present in all populations, but the population genetic variation and genetic differentiation were related to their geographical distributions. The SDM result indicated that Q. chungii retreated to the Nanling Mountains and adjacent areas during the Last Glacial Maximum (LGM) period, which corresponds to higher genetic diversity for populations in this region. Landscape genetic analysis showed that the Nanling Mountains served as a corridor for organism dispersal at the glacial and interglacial periods within the Quaternary. Based on these results, we propose that establishing nature reserves to protect the ecological corridor across the Nanling Mountains is necessary for the conservation of regional species genetic diversity, as well as the ecosystem of evergreen broadleaved forests in southern China. The study combines species distribution models and genetic diversity to provide new insight into biodiversity conservation and forest management under future climate change.