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首页> 外文期刊>Transactions of the American Fisheries Society >Genetic structure of Atlantic sturgeon populations based on mitochondrial DNA control region sequences.
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Genetic structure of Atlantic sturgeon populations based on mitochondrial DNA control region sequences.

机译：基于线粒体DNA控制区序列的大西洋st鱼种群的遗传结构。

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摘要

We sequenced a 203-base-pair section of the mtDNA control region of 322 Atlantic sturgeon (Acipenser oxyrinchus oxyrinchus) from 11 river systems across their range to elucidate their stock structure. We found a pronounced latitudinal cline in the number of composite mtDNA haplotypes and in haplotypic diversity, which increased from north to south, from previously glaciated and subsequently recolonized systems to the portion of their range unglaciated during the Pleistocene. The observed number ofhaplotypes per population ranged from 1 haplotype in each of the 2 northernmost population samples to 17 in the sample from the Savannah River. Haplotypic diversity ranged from 0.0 to 0.90. The greater genetic diversity within and among southern populations is probably a product of the persistence of these populations through the Pleistocene and the faster mutation rates associated with their shorter generation times. Of 39 composite mtDNA haplotypes found, 64% were unique to particular populations. Monomorphism of the 2 Canadian populations suggested a strong founder effect. Three haplotypes unique to northern populations were probably the result of base substitutions that occurred within the past 10 000 years. In contrast with an earlier study, we found stock structure among southern populations and evidence of at least 7 genetic stocks across this subspecies' range.
机译：我们对322个大西洋st鱼（Acipenser oxyrinchus oxyrinchus）的mtDNA控制区的203个碱基对片段进行了测序，以分析其种群范围内的11个河流系统。我们在复合线粒体DNA单倍型的数量和单倍型多样性中发现了一个明显的纬度系，其从北到南，从先前的冰川化和随后的重新殖民化的系统到更新世期间未冰川化的范围的一部分。观察到的每个单元的单倍型数量从最北端的两个人口样本中的每个单倍型到萨凡纳河样本中的17个单倍型不等。单倍型多样性的范围从0.0到0.90。南部种群内部和之中更大的遗传多样性可能是这些种群通过更新世持续存在的原因，以及其较短的产生时间带来的更快的突变率的产物。在发现的39种mtDNA复合单倍型中，有64％是特定人群所独有的。 2个加拿大人口的单态性表明其强大的创始人效应。北部种群特有的三种单倍型可能是过去一万年来发生的碱基替代的结果。与早期的研究相反，我们发现了南方种群的种群结构，并且在该亚种范围内至少有7个遗传种群的证据。

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