Narum Shawn R, Gallardo Pablo, Correa Cristian, Matala Amanda, Hasselman Daniel, Sutherland Ben J G, Bernatchez Louis
Hagerman Fish Culture Experiment Station Columbia River Inter-Tribal Fish Commission Hagerman ID USA.
Centro de Cultivos Marinos Bahía Laredo University of Magallanes Punta Arenas Chile.
Evol Appl. 2017 Mar 6;10(4):402-416. doi: 10.1111/eva.12464. eCollection 2017 Apr.
Invasive species have become widespread in aquatic environments throughout the world, yet there are few studies that have examined genomic variation of multiple introduced species in newly colonized environments. In this study, we contrast genomic variation in two salmonid species (anadromous Chinook Salmon, , 11,579 SNPs and resident Brook Charr , 13,522 SNPs) with differing invasion success after introduction to new environments in South America relative to populations from their native range in North America. Estimates of genetic diversity were not significantly different between introduced and source populations for either species, indicative of propagule pressure that has been shown to maintain diversity in founding populations relative to their native range. Introduced populations also demonstrated higher connectivity and gene flow than those in their native range. Evidence for candidate loci under divergent selection was observed, but was limited to specific introduced populations and was not widely evident. Patterns of genomic variation were consistent with general dispersal potential of each species and therefore also the notion that life history variation may contribute to both invasion success and subsequent genetic structure of these two salmonids in Patagonia.
入侵物种已在世界各地的水生环境中广泛分布，但很少有研究考察新殖民环境中多个引入物种的基因组变异。在本研究中，我们对比了两种鲑科鱼类（溯河洄游的奇努克鲑，11,579个单核苷酸多态性位点和定居的溪红点鲑，13,522个单核苷酸多态性位点）在引入南美洲新环境后与来自北美原生范围种群相比的不同入侵成功率下的基因组变异。两种物种的引入种群和源种群之间的遗传多样性估计没有显著差异，这表明繁殖体压力已被证明相对于其原生范围在奠基种群中维持了多样性。引入种群也表现出比其原生范围内的种群更高的连通性和基因流。观察到了在分歧选择下的候选基因座的证据，但仅限于特定的引入种群，并不广泛明显。基因组变异模式与每个物种的一般扩散潜力一致，因此也与生活史变异可能有助于这两种鲑科鱼类在巴塔哥尼亚的入侵成功和随后的遗传结构这一观点一致。
