Forest fragmentation genetics in a formerly widespread island endemic tree: Vateriopsis seychellarum (Dipterocarpaceae)
Forest fragmentation genetics in a formerly widespread island endemic tree: Vateriopsis seychellarum (Dipterocarpaceae)
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DOI：
10.1111/j.1365-294x.2012.05543.x
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发表时间：
2012-05-01
影响因子：
4.9
通讯作者：
Ghazoul, J.
中科院分区：
文献类型：
--
作者：
Finger, A.;Kettle, C. J.;Ghazoul, J.
栖息地的破碎化和土地利用的改变严重减少了许多热带森林树种的种群规模。基因流有限的以前广泛分布的物种可能特别容易受到森林破碎化和种群规模较小的负面遗传影响。 Vateriopsis seychellarum（龙脑香科）是塞舌尔群岛以前广泛分布的树冠树，但现在已减少到分布在 11 个地点的 132 棵成年个体。使用十个微卫星位点、所有成年树木的遗传清单和 317 个后代的样本，我们证明尽管其范围有限，但总体遗传多样性相对较高（HE：0.56）。然而，幼年树的等位基因丰富度（成年树 RS：3.91；幼年树 RS：2.83）显着低于成年树（成年树 HO：0.62；幼年树 HO：0.48）。在青少年中，稀有等位基因较少，个体之间的亲缘关系更强。在残余成虫中观察到显着的精细尺度空间遗传结构，亲子关系分析表明，90%以上的样本后代分散了
Habitat fragmentation and changed land use have seriously reduced population size in many tropical forest tree species. Formerly widespread species with limited gene flow may be particularly vulnerable to the negative genetic effects of forest fragmentation and small population size. Vateriopsis seychellarum (Dipterocarpaceae) is a formerly widespread canopy tree of the Seychelles, but is now reduced to 132 adult individuals distributed in eleven sites. Using ten microsatellite loci, a genetic inventory of all adult trees and a sample of 317 progeny, we demonstrate that despite its restricted range, overall genetic diversity was relatively high (HE: 0.56). The juvenile cohort, however, had significantly lower allelic richness (adults RS: 3.91; juveniles RS: 2.83) and observed heterozygosity than adult trees (adults HO: 0.62; juveniles HO: 0.48). Rare alleles were fewer and kinship between individuals was stronger in juveniles. Significant fine-scale spatial genetic structure was observed in remnant adults, and parentage analysis indicated that more than 90% of sampled progeny disperse