Department of Biology, Dalhousie University, Halifax, NS, Canada.
Mol Ecol. 2013 May;22(9):2394-407. doi: 10.1111/mec.12186. Epub 2013 Jan 14.
We describe temporal changes in the genetic composition of a small anadromous Atlantic salmon (Salmo salar) population from South Newfoundland, an area where salmon populations are considered threatened (COSEWIC 2010). We examined the genetic variability (13 microsatellite loci) in 869 out-migrating smolt and post-spawning kelt samples, collected from 1985 to 2011 for a total of 22 annual collections and a 30 year span of assigned cohorts. We estimated the annual effective number of breeders (Nb) and the generational effective population size (Ne) through genetic methods and demographically using the adult sex ratio. Comparisons between genetic and demographic estimates show that the adult spawners inadequately explain the observed Ne estimates, suggesting that mature male parr are significantly increasing Nb and Ne over the study period. Spawning as parr appears to be a viable and important strategy in the near absence of adult males.
我们描述了来自纽芬兰省南部的一个小洄游性大西洋三文鱼（Salmo salar）种群遗传组成的时间变化，该地区的三文鱼种群被认为受到威胁（COSEWIC 2010）。我们研究了 1985 年至 2011 年期间采集的 869 个洄游性幼鱼和产卵后幼鱼样本的遗传变异性（13 个微卫星位点），总共进行了 22 次年度采集和 30 年的指定群体跨度。我们通过遗传方法和利用成年性别比来估计每年的有效繁殖者数量（Nb）和世代有效种群大小（Ne）。遗传和人口统计学估计之间的比较表明，成年产卵者不能充分解释观察到的 Ne 估计值，这表明成熟的雄性幼鱼在研究期间显著增加了 Nb 和 Ne。作为幼鱼产卵似乎是一种可行且重要的策略，尤其是在成年雄性鱼类近于缺失的情况下。
