Department of Biology, Centre for Biomedical Research, University of Victoria, Victoria, BC, V8W 2Y2, Canada.
Fisheries and Oceans Canada, 4160 Marine Drive, West Vancouver, BC, V7V 1N6, Canada.
G3 (Bethesda). 2023 Apr 11;13(4). doi: 10.1093/g3journal/jkad033.
Coho salmon (Oncorhynchus kisutch) are a culturally and economically important species that return from multiyear ocean migrations to spawn in rivers that flow to the Northern Pacific Ocean. Southern stocks of coho salmon in Canada and the United States have significantly declined over the past quarter century, and unfortunately, conservation efforts have not reversed this trend. To assist in stock management and conservation efforts, we generated a chromosome-level genome assembly. We also resequenced the genomes of 83 coho salmon across the North American range to identify nucleotide variants and understand the demographic histories of these salmon by modeling effective population size from genome-wide data. From demographic history modeling, we observed reductions in effective population sizes between 3,750 and 8,000 years ago for several northern sampling sites, which may correspond to bottleneck events during recolonization after glacial retreat.
银大麻哈鱼（Oncorhynchus kisutch）是一种具有文化和经济重要性的物种，它们从多年的海洋洄游返回，在流入北太平洋的河流中产卵。在过去的四分之一个世纪里，加拿大和美国的南方银大麻哈鱼种群数量大幅下降，不幸的是，保护工作并没有扭转这一趋势。为了协助种群管理和保护工作，我们生成了一个染色体水平的基因组组装。我们还对北美的 83 条银大麻哈鱼进行了基因组重测序，以鉴定核苷酸变体，并通过基于全基因组数据的有效种群大小建模来了解这些鲑鱼的种群历史。从种群历史建模中，我们观察到几个北部采样点的有效种群数量在 3750 到 8000 年前减少，这可能与冰川退缩后重新殖民化期间的瓶颈事件相对应。
