Evgeniia I. Bondar, Alla G. Oleinik, Andrey D. Kukhlevsky, Lubov A. Skurikhina, Natalia M. Batishcheva, Alexander F. Kirillov
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In this study, we explored the affiliation of lacustrine charrs from the Chukotka area with (1) the Arctic lineage of Taranetz' charr (<i>Salvelinus taranetzi</i>); (2) the Bering lineage of Northern Dolly Varden (<i>Salvelinus malma malma</i>) and (3) the Siberia and Atlantic lineages of Arctic charr (<i>Salvelinus alpinus</i>). We analysed sequence variation of the mitochondrial DNA control region (mtDNA CR; 960 base pairs) and genotyped seven microsatellite loci of nuclear DNA from charr collected at 13 sampling sites. We found different consequences of secondary contact: (1) complete fixation of introgressed mtDNA (mitochondrial capture) and (2) preservation of several mtDNA lineages with the absence of contemporary gene flow between resident populations. 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引用次数: 0
摘要
亚洲东北部的北极地区是鲑形目鲑科鲑属冰川系统发育系的二次接触地区。然而,由于对楚科奇及其邻近地区鲑鱼种群的了解仍然有限,人们对冰川期后鲑鱼在北极地区的扩散情况知之甚少。具体来说,对于楚科奇从海岸到科雷马河流域的重要地区栖息着哪些鲑鱼物种还没有明确的了解。在这项研究中,我们探讨了楚科奇地区的湖泊红点鲑与以下物种的隶属关系:(1)塔拉涅兹红点鲑的北极系;(2)北多尔瓦登鱼(Salvelinus malma malma)的白令系;(3)北极红点鲑(Salvelinus alpinus)的西伯利亚系和大西洋系。我们分析了线粒体 DNA 控制区(mtDNA CR;960 碱基对)的序列变异,并对 13 个采样点采集的北极鲑的核 DNA 的 7 个微卫星位点进行了基因分型。我们发现了二次接触的不同后果:(1)引入的 mtDNA 完全固定(线粒体捕获);(2)保留了几个 mtDNA 系,但在居民种群之间没有当代基因流。结合分布模式、系统发育网络拓扑结构和对该地区冰川历史的了解,我们提出了楚科奇-科利马-楚科奇河系和帕里奥-阿姆古马河两个冰川系的二次接触区,带有外源基因组的红毛鲑就是从这两个接触区扩散到整个楚科奇地区的。不过,在某些情况下,外来 mtDNA 的捕获过程可能会以更局部的方式发生。
Multiple secondary contacts and historic hybridization between glacial lineages of charr (Salvelinus, Salmonidae) in northeastern Asia
Arctic regions of northeastern Asia represent areas of secondary contact of the glacial phylogenetic lineages of charrs belonging to the genus Salvelinus (Salmoniformes: Salmonidae). However, the post-glacial dispersion of charr across Arctic regions is poorly understood, as knowledge of populations from Chukotka and its neighbouring areas remains limited. Specifically, there is no clear understanding of which charr species inhabit significant regions of Chukotka from the sea coasts to the Kolyma drainage. In this study, we explored the affiliation of lacustrine charrs from the Chukotka area with (1) the Arctic lineage of Taranetz' charr (Salvelinus taranetzi); (2) the Bering lineage of Northern Dolly Varden (Salvelinus malma malma) and (3) the Siberia and Atlantic lineages of Arctic charr (Salvelinus alpinus). We analysed sequence variation of the mitochondrial DNA control region (mtDNA CR; 960 base pairs) and genotyped seven microsatellite loci of nuclear DNA from charr collected at 13 sampling sites. We found different consequences of secondary contact: (1) complete fixation of introgressed mtDNA (mitochondrial capture) and (2) preservation of several mtDNA lineages with the absence of contemporary gene flow between resident populations. Combining the distribution patterns, phylogenetic network topology and knowledge of the glaciation history of the region, we propose two zones of secondary contact of the glacial lineages in Chukotka–Kolima-Chukotka River system and Paleo-Amguema River–from where charrs with introgressed genomes spread throughout this range. However, in some cases, the process of foreign mtDNA capture likely occurs in a more localised manner.
期刊介绍:
Ecology of Freshwater Fish publishes original contributions on all aspects of fish ecology in freshwater environments, including lakes, reservoirs, rivers, and streams. Manuscripts involving ecologically-oriented studies of behavior, conservation, development, genetics, life history, physiology, and host-parasite interactions are welcomed. Studies involving population ecology and community ecology are also of interest, as are evolutionary approaches including studies of population biology, evolutionary ecology, behavioral ecology, and historical ecology. Papers addressing the life stages of anadromous and catadromous species in estuaries and inshore coastal zones are considered if they contribute to the general understanding of freshwater fish ecology. Theoretical and modeling studies are suitable if they generate testable hypotheses, as are those with implications for fisheries. Manuscripts presenting analyses of published data are considered if they produce novel conclusions or syntheses. The journal publishes articles, fresh perspectives, and reviews and, occasionally, the proceedings of conferences and symposia.