Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
Salmonids possess straying abilities that allows them to exploit open territory and establish new populations. Atlantic salmon (Salmo salar) are expanding their distribution primarily as first-generation escapes from aquaculture, whereas Pacific salmon (Oncorhynchus spp.) are expanding their range in polar and temperate regions due to both anthropogenic and natural influences. Here we utilize artificial intergeneric reciprocal crosses to assess the ability of seven species of Pacific salmon to hybridize with Atlantic salmon. Most cross types were found to produce low numbers of hatched embryos, but none survived to sexual maturation. Survivors consisted of diploids and triploids containing both Atlantic and Pacific salmon parental genomes. Thus, introgression of DNA between Pacific and Atlantic salmon may occur to form F1 hybrids, but transmission to subsequent generations is expected to be rare and occur only over evolutionary time scales. Further, the low viability observed for the most part at early stages of development and in both reciprocal crosses indicates that intergeneric crosses in nature between Atlantic and Pacific salmon are expected to have severe fitness consequences for both dams and sires.

中文翻译：

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大西洋和太平洋鲑鱼杂交潜力的评估

加拿大渔业和水生科学杂志，印刷前。
鲑鱼具有流浪能力，使它们能够开发开阔的领土并建立新的种群。大西洋鲑（Salmo salar）主要作为第一代从水产养殖中逃逸而扩大其分布范围，而太平洋鲑（Oncorhynchus spp.）由于人为和自然的影响，正在极地和温带地区扩大其范围。在这里，我们利用人工属间互惠杂交来评估七种太平洋鲑鱼与大西洋鲑鱼杂交的能力。发现大多数杂交类型产生少量孵化的胚胎，但没有一个存活到性成熟。幸存者由含有大西洋和太平洋鲑鱼亲本基因组的二倍体和三倍体组成。因此，太平洋鲑鱼和大西洋鲑鱼之间的 DNA 渗入可能会形成 F1 杂种，但预计很少会传播给后代，并且只会在进化的时间尺度上发生。此外，在发育的早期阶段和两个相互杂交中观察到的大部分低生存能力表明，大西洋和太平洋鲑鱼之间的自然属间杂交预计会对水坝和公牛产生严重的适应性后果。