Genetic diversity and population structure in the endangered tree Hopea hainanensis (Dipterocarpaceae) on Hainan Island, China.
Genetic diversity and population structure in the endangered tree Hopea hainanensis (Dipterocarpaceae) on Hainan Island, China.
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中国海南岛濒危树种龙脑香科的遗传多样性和种群结构
DOI：
10.1371/journal.pone.0241452
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发表时间：
2020
期刊：
影响因子：
3.7
通讯作者：
Tang L
中科院分区：
文献类型：
--
作者：
Wang C;Ma X;Ren M;Tang L
Hopea hainanensis Merrill & Chun（龙脑香科）是一种濒临灭绝的树种，仅限于中国海南岛和越南北部的一小部分地区。在海南岛，它是热带森林的重要指示树种。然而，由于其木材价值极高，海南胡桃遭受过度开采，导致其数量急剧下降。为了促进该物种的保护，利用 12 个 SSR 标记对海南岛的 10 个种群进行了遗传多样性和种群结构评估。与未受威胁的希望物种相比，H. hainanensis 表现出整体遗传多样性降低和种群分化增加（AMOVA：FST = 0.23）。基于贝叶斯模型的聚类和主坐标分析一致地将海南人个体分为三个遗传群体，这些群体分布广泛且在地理上重叠。曼特尔检验发现遗传距离和地理距离之间没有相关性（r = 0.040，p = 0.418）。观察到的遗传结构表明，在栖息地破碎之前，海南人群体中就发生了长距离基因流动。最近揭示了一个种群瓶颈，这可能导致遗传多样性迅速丧失并增加种群之间的分化。基于这些发现，提出了长期保护濒危物种海南花的适当策略。
Hopea hainanensis Merrill & Chun (Dipterocarpaceae) is an endangered tree species restricted to Hainan Island, China and a small part of Northern Vietnam. On Hainan Island, it is an important indicator species for tropical forests. However, because of its highly valued timber, H. hainanensis has suffered from overexploitation, leading to a sharp population decline. To facilitate the conservation of this species, genetic diversity and population structure were assessed using 12 SSR markers for 10 populations sampled across Hainan Island. Compared to non-threatened Hopea species, H. hainanensis exhibited reduced overall genetic diversity and increased population differentiation (AMOVA: FST = 0.23). Bayesian model-based clustering and principal coordinate analysis consistently assigned H. hainanensis individuals into three genetic groups, which were found to be widespread and overlapping geographically. A Mantel test found no correlation between genetic and geographical distances (r = 0.040, p = 0.418). The observed genetic structure suggests that long-distance gene flow occurred among H. hainanensis populations prior to habitat fragmentation. A recent population bottleneck was revealed, which may cause rapid loss of genetic diversity and increased differentiation across populations. Based on these findings, appropriate strategies for the long-term conservation of the endangered species H. hainanensis are proposed.
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影响因子：
4.9
作者：
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通讯作者：
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影响因子：
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影响因子：
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