Fragmentation reduces regional-scale spatial genetic structure in a wind-pollinated tree because genetic barriers are removed.
Fragmentation reduces regional-scale spatial genetic structure in a wind-pollinated tree because genetic barriers are removed.
复制标题
由于遗传障碍被消除，碎片化减少了风授粉树的区域尺度空间遗传结构
DOI：
10.1002/ece3.344
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发表时间：
2012-09
影响因子：
2.6
通讯作者：
Chen, Xiao-Yong
中科院分区：
文献类型：
--
作者：
Wang, Rong;Compton, Stephen G.;Shi, Yi-Su;Chen, Xiao-Yong
基因流动强烈地影响着植物种群的区域遗传结构。种子和花粉的传播模式可能会对生境碎片化导致的日益孤立做出不同的反应，从而对基因流动和种群结构产生不可预测的后果。在最近碎片化的景观中，我们比较了一个树种种群碎片化前和碎片化后的遗传结构，其中花粉和种子的传播对洪水造成的森林碎片化的反应不同。硬叶栎属风媒，种子靠重力和啮齿动物传播。使用微卫星，我们发现分裂前和分裂后的队列之间的遗传多样性没有显著差异。在分裂前的队列中观察到了显著的遗传结构，这是由于一种未知的遗传障碍隔离了一个小种群。在碎片化后的队列中，这种遗传障碍已经消失，遗传结构显着减弱。在两个队列中，遗传结构的强度处于相似的水平，这表明在区域尺度上，硬叶锦鸡儿的整体基因流并没有受到片段化的影响。碎片化阻碍了种子在生境之间的传播，但这似乎被加强的花粉传播所弥补，这表明遗传障碍的消失，可能是由于风速增加和更容易的花粉在水面上移动的结果。广泛的花粉流可以抵消一些碎片化的负面影响，并有助于小残留种群的长期持续。
Gene flow strongly influences the regional genetic structuring of plant populations. Seed and pollen dispersal patterns can respond differently to the increased isolation resulting from habitat fragmentation, with unpredictable consequences for gene flow and population structuring. In a recently fragmented landscape we compared the pre- and post-fragmentation genetic structure of populations of a tree species where pollen and seed dispersal respond differentially to forest fragmentation generated by flooding. Castanopsis sclerophylla is wind-pollinated, with seeds that are dispersed by gravity and rodents. Using microsatellites, we found no significant difference in genetic diversity between pre- and post-fragmentation cohorts. Significant genetic structure was observed in pre-fragmentation cohorts, due to an unknown genetic barrier that had isolated one small population. Among post-fragmentation cohorts this genetic barrier had disappeared and genetic structure was significantly weakened. The strengths of genetic structuring were at a similar level in both cohorts, suggesting that overall gene flow of C. sclerophylla has been unchanged by fragmentation at the regional scale. Fragmentation has blocked seed dispersal among habitats, but this appears to have been compensated for by enhanced pollen dispersal, as indicated by the disappearance of a genetic barrier, probably as a result of increased wind speeds and easier pollen movement over water. Extensive pollen flow can counteract some negative effects of fragmentation and assist the long-term persistence of small remnant populations.
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影响因子：
3.3
作者：
Fenster, CB;Vekemans, X;Hardy, OJ
通讯作者：
Hardy, OJ
影响因子：
4.9
作者：
De-Lucas, A. I.;Gonzalez-Martinez, S. C.;Heuertz, M.
通讯作者：
Heuertz, M.
影响因子：
5.9
作者：
Cramer, Jennifer M.;Mesquita, Rita C. G.;Williamson, G. Bruce
通讯作者：
Williamson, G. Bruce
影响因子：
3.3
作者：
Guillot, G;Estoup, A;Cosson, JF
通讯作者：
Cosson, JF
DOI：
10.1111/j.1471-8286.2005.01031.x
发表时间：
2005-09-01
期刊：
MOLECULAR ECOLOGY NOTES
影响因子：
--
作者：
Guillot, G;Mortier, F;Estoup, A
通讯作者：
Estoup, A