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首页> 外文期刊>Ecology letters >Genetic assessment of spatiotemporal evolutionary relationships and stocking effects in grayling (Thymallus thymallus, Salmonidae)
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Genetic assessment of spatiotemporal evolutionary relationships and stocking effects in grayling (Thymallus thymallus, Salmonidae)

机译：时空进化关系和河豚放养效应的遗传评估（Thymallus thymallus，鲑科）

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摘要

Domestically reared introduced (or escaped) individuals can have detrimental genetic effects on the indigenous populations into which they are released. Consequently, numerous studies have attempted to estimate whether non-native specimens have contributed to the gene pool of wild populations. So far, the key limiting factor of such studies has been their lack of appropriate baseline genetic material. Here, microsatellite DNA analyses of historical scale samples and contemporary wild and introduced populations were used to assess spatiotemporal population structure and stocking effects among endangered Lake Saimaa (eastern Finland) grayling (Thymallus thymallus, Salmonidae). Significant decrease in genetic differentiation were detected between wild and introduced populations since the commencement of stocking in 1986. Accordingly, up to 15% of the contemporary wild grayling were confidently identified to be of pure hatchery origin, and recent hybridization between the hatchery and indigenous individuals appeared likely. Despite these clear genetic imprints of stocking, the contemporary populations exhibited evolutionary relationships congruent with the sampling locations, and up to 73% of contemporary individuals were identified to be of pure indigenous origin. The use of historical baseline material should prove efficient for monitoring gene flow between domesticated and wild populations in other species also, e.g. salmonids, game animals and plants.
机译：在国内培育的引进（或逃脱）的个体可能会对释放他们的土著人口产生有害的遗传影响。因此，许多研究试图估计非本地样本是否有助于野生种群的基因库。到目前为止，此类研究的关键限制因素一直是缺乏适当的基线遗传物质。在这里，对历史规模的样本以及当代野生种群和引进种群进行微卫星DNA分析，以评估时空种群结构和濒危赛马湖（芬兰东部）河鳟（Thymallus thymallus，鲑科）的种群效应。自1986年开始放养以来，在野生种群和外来种群之间发现了遗传分化的显着下降。因此，有把握地确定了多达15％的当代野生河鳟纯属孵化场，并且最近孵化场与土著个体之间发生了杂交出现的可能性。尽管有这些清晰的种群遗传印记，但当代种群仍表现出与采样地点一致的进化关系，并且高达73％的当代个体被确定为纯土著血统。使用历史基准材料也应证明对监测其他物种的驯化和野生种群之间的基因流有效，例如：鲑鱼，野生动物和植物。

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