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加州Russian河人工与自然屏障上下游虹鳟种群结构与遗传多样性

已有 1088 次阅读 2020-11-19 15:22 |系统分类:科研笔记

景观特征对受威胁和濒危物种的基因流动的影响在影响种群的遗传结构中起着重要作用。

利用加州中部俄罗斯河流域20个位点虹鳟样本的22个微卫星位点,评估了自然(瀑布)和人为(水坝)屏障之上和之下的鱼类遗传结构和变异的相对模式。并与加州其他16个沿海流域的样本进行了比较。结果表明,在俄罗斯河内采样的20个地点之间的遗传变异被显着分为天然屏障以上的6组和屏障以下和坝上的所有区域。尽管下面的屏障位点显示出适度的基因流动,但我们发现了对流域中单个支流亚种群分化的一些支持。与高屏障位点相比,所有高屏障位点的遗传变异都很高。大坝上方的鱼类与屏障附近地区的鱼类相似,且遗传多样性水平相似,这表明它们与屏障以下种群的分离时间不长。来自自然界线以上的人口样本差异很大,其中很大F st值,且遗传多样性明显较低,表明种群相对较小。无法通过将微卫星多样性与其他加利福尼亚河流进行比较来确定自然屏障之上的种群起源。最后,与河口附近的低于屏障的地点相比,较内陆的低于屏障的地点在遗传上与其他流域的区别更大。


Population structure and genetic diversity of trout (Oncorhynchus mykiss) above and below natural and man-made barriers in the Russian River, California

Kristy Deiner, John Carlos Garza, Robert Coey & Derek J. Girman 

Conservation Genetics volume 8, pages437–454(2007)Cite this article


Abstract

The effects of landscape features on gene flow in threatened and endangered species play an important role in influencing the genetic structure of populations. 

Genetic variation among the 20 sites sampled within the Russian River was significantly partitioned into six groups above natural barriers and one group consisting of all below barrier and above dam sites. Although the below-barrier sites showed moderate gene flow, we found some support for sub-population differentiation of individual tributaries in the watershed. Genetic variation at all below-barrier sites was high compared to above-barrier sites. Fish above dams were similar to those from below-barrier sites and had similar levels of genetic diversity, indicating they have not been isolated very long from below-barrier populations. Population samples from above natural barriers were highly divergent, with large F st values, and had significantly lower genetic diversity, indicating relatively small population sizes. The origins of populations above natural barriers could not be ascertained by comparing microsatellite diversity to other California rivers. Finally, below-barrier sites farther inland were more genetically differentiated from other watersheds than below-barrier sites nearer the river’s mouth.

https://doi.org/10.1007/s10592-006-9183-0



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