Genetic structure of brown trout, Salmo trutta L., at the southern limit of the distribution range of the anadromous form
Genetic structure of brown trout, Salmo trutta L., at the southern limit of the distribution range of the anadromous form
复制标题
溯河产卵分布范围南端褐鳟 (Salmo trutta L.) 的遗传结构
作者：
C. Bouza;J. Arias;J. Castro;L. Sánchez;P. Martínez
在33个蛋白质位点的遗传变异进行了调查，在41个野生褐鳟鱼种群从四个流域加利西亚（西班牙西北部）分析的数量和分布的遗传多样性在边缘地区，位于该物种的溯河产卵形式的分布限制。种群内检测到的遗传多样性（H在0和6%之间）在以前的报告中为该物种引用的范围内。Miño是分析的最南部的河流流域，在所研究的河流流域中，遗传多样性明显较低，遗传分化最高。层次基因多样性分析表明，在一个有限的区域（GST = 27%），主要是由于人口之间的差异盆地（GSC = 22%）的人口分化。GST的减少时，观察到的孤立的样品被排除在分析（GST = 17%）显示的重要性，栖息地碎片化的异质性检测。用3种间接方法对居群间的基因流动进行了比较研究，结果表明，每代迁移的绝对数量一般较低，略高于1。流域间基因流动与地理距离呈正相关。这一趋势得到证实的地理和遗传距离之间的显着相关性，包括所有的人口对，这表明在褐鳟鱼遗传结构的距离隔离的一个组成部分。然而，不显着的流域内相关性表明该物种种群间遗传关系的复杂性。根据所得结果讨论了褐鳟鱼遗传结构的模式。
Genetic variation at 33 protein loci was investigated in 41 wild brown trout populations from four river basins in Galicia (northwest Spain) to analyse the amount and distribution of genetic diversity in a marginal area, located in the distribution limit of the anadromous form of this species. The genetic diversity detected within populations (H between 0 and 6%) lies within the range quoted for this species in previous reports. The Miño, the most southern river basin analysed, showed a significantly lower genetic diversity and the highest genetic differentiation among the river basins studied. The hierarchical gene diversity analysis showed high population differentiation in a restricted area (GST = 27%), mostly due to differences among populations within basins (GSC = 22%). The reduction of GST observed when the isolated samples were excluded from the analysis (GST = 17%) showed the importance of habitat fragmentation on the heterogeneity detected. Gene flow among populations was comparatively evaluated by three indirect methods, which in general revealed low figures of absolute number of migrants per generation, slightly higher than 1. The gene flow among basins reflected a positive relationship with geographical distance. This trend was confirmed by the significant correlation observed between geographical and genetic distances, including all population pairs, which suggests a component of isolation by distance in brown trout genetic structure. Nevertheless, the nonsignificant intrabasin correlation demonstrates the complexity of genetic relationships among populations in this species. The model of genetic structure in brown trout is discussed in the light of the results obtained.
影响因子：
1.9
作者：
HERNANDEZ, JL;WEIR, BS
通讯作者：
WEIR, BS