Effects of Fragmentation of Evergreen Broad-leaved Forests on Genetic Diversity of Ardisia Crenata var. Bicolor (Myrsinaceae)
Effects of Fragmentation of Evergreen Broad-leaved Forests on Genetic Diversity of Ardisia Crenata var. Bicolor (Myrsinaceae)
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DOI：
10.1007/s10531-005-4875-1
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发表时间：
2006-04
影响因子：
3.4
通讯作者：
Aihua Zhao;Xiao‐Yong Chen;Xin Zhang;Dong Zhang-
中科院分区：
文献类型：
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作者：
Aihua Zhao;Xiao‐Yong Chen;Xin Zhang;Dong Zhang-
由于世代时间长、密度高，优势树种对近期破碎化的反应通常与理论预测不一致。灌木和草本植物的遗传结构，尤其是那些低密度的灌木和草本植物，可能对森林破碎化更敏感。我们在最近破碎的景观中研究了自交亲和亚灌木 Ardisia crenatavar.bicolor（紫金牛科）的遗传结构。用于分析的 10 个 RAPD 引物总共产生了 76 个条带。我们发现A. c. var.bicolor具有相对较低的物种水平（P95= 63.2%；H= 0.106；香农多样性指数（SI）= 0.246）和种群内多样性（P95= 5.3−46.1%；H= 0.026−0.175；SI= 0.032−0.253），以及显着的种群分化（GST= 0.445）。在多样性测量（P95、Hand SI）和估计种群规模的对数之间发现了显着的正相关关系。 Nei 遗传距离与成对群体的空间距离之间没有观察到显着关系，表明不存在距离隔离。鉴于大多数森林物种都是世代时间短的灌木和草本植物，我们的观察表明，近期的破碎化可能会对相当多的植物物种产生明显的遗传后果。
Due to the long generation times and high densities, dominant tree species usually did not respond consistently with theoretical predictions to the recent fragmentation. Genetic structures of shrubs and herbs, especially those with low densities, may be more sensitive to forest fragmentation. We studied the genetic structure of a self-compatible subshrub,Ardisia crenatavar.bicolor(Myrsinaceae) in a recently fragmented landscape. Ten RAPD primers used for analysis generated a total of 76 bands. We found thatA. c. var.bicolorhad relatively low species-level (P95= 63.2%;H= 0.106; Shannon diversity index (SI) = 0.246) and within-population diversity (P95= 5.3−46.1%;H= 0.026−0.175; SI = 0.032−0.253), and significant population differentiation (GST= 0.445). Significantly positive relationships were found between measures of diversity (P95,Hand SI) and the log of estimated population size. No significant relationship was observed between Nei's genetic distance and spatial distance of pairwise populations, indicating no isolation-by-distance. Given most species of forests are shrubs and herbs with short generation times, our observation indicated that distinct genetic consequences of recent fragmentation may be expected for quite a number of plant species.