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首页> 外文期刊>Marine biology >Hierarchical population genetic structure in the commercially exploited shrimp Crangon crangon identified by AFLP analysis
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Hierarchical population genetic structure in the commercially exploited shrimp Crangon crangon identified by AFLP analysis

机译：通过AFLP分析鉴定的商业开发虾Crangon虾的分层种群遗传结构

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摘要

The coastal shrimp Crangon crangon is an ecologically and commercially important species but there is limited knowledge of its genetic population structure. We utilised amplified fragment length polymorphisms (AFLPs) to investigate population differentiation among eight sampling locations comprising paired sites from north- and south-western Britain, the eastern English Channel and the Baltic Sea. Initial AMOVA and cluster analysis suggested strong differentiation, but outlier analysis identified three loci that might be subject to selection, one of which showed significant latitudinal variation in allele frequencies. Following exciusion of these outlier loci, and also of a divergent, genetically-impoverished sample from the UK Bristol Channel, cluster analysis revealed three major groupings, corresponding to geographical regions: western Britain, the eastern English Channel and the Baltic Sea. AMOVA identified significant differentiation both within and among these regions, with similar variation explained by each hierarchical level. C. crangon shows greater genetic structuring than has been found in many decapod crustaceans studied to date, and our results are consistent with unstable population sizes and gene flow restricted by distance and probably also hydrographic features. Further investigation of temporal stability in population structure is required, but broad-scale homogeneity of fishery stocks should not be assumed.
机译：沿海虾Crangon crangon是具有生态和商业意义的物种，但对其遗传种群结构的了解有限。我们利用扩增的片段长度多态性（AFLP）来调查八个采样点之间的种群分化，这些采样点包括来自英国西北部和西南部，英吉利海峡东部和波罗的海的成对站点。最初的AMOVA和聚类分析表明存在强烈的分化，但离群分析确定了可能要选择的三个基因座，其中之一显示等位基因频率存在明显的纬度变异。在排除了这些异常基因座以及来自英国布里斯托尔海峡的不同的，遗传贫困的样本后，聚类分析发现了三个主要的组，对应于地理区域：西英格兰，英属东部海峡和波罗的海。 AMOVA识别出这些区域内部和区域之间的显着差异，每个等级级别都解释了类似的差异。 C. crangon的遗传结构比迄今为止研究的许多十足纲甲壳类动物更强，我们的结果与不稳定的种群规模和受距离以及水文特征限制的基因流一致。需要对种群结构的时间稳定性进行进一步研究，但不应假定渔业种群具有广泛的同质性。

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