Declines in abundance and genetic diversity in plant and animal populations are increasingly of conservation concern. Genetic rescue, or the supplementation of declining populations with individuals from genetically different sources, may aid in demographic and genetic recovery efforts, assuming introduced individuals successfully reproduce following translocation. However, the relative reproductive contributions of resident and translocated individuals are not frequently evaluated. In the northern lower peninsula of Michigan, USA, fourteen brown trout (Salmo trutta) from each of three different tributaries were introduced into a research stream (Hunt Creek) to supplement a small, isolated resident brown trout population. Mean expected heterozygosity and mean allelic richness differed between the three translocated populations compared to residents. Additionally, inter-population variance in allele frequency (F_ST) between resident and translocated populations ranged from 0.024 to 0.098. Using genetic parentage assignments, we documented that translocated and resident brown trout did interbreed; however, intra-population mating events were more common. Simulations indicated that increases in genetic diversity among age-1 offspring were the result of reproduction by translocated adults, as genetic variation was significantly above levels expected by reproduction among residents alone (p < 0.001). To achieve management goals for genetic rescue programs, managers would be advised to conduct simulations and hypothesis testing in addition to collection of empirical genetic data to evaluate introduction outcomes.

动植物种群的丰度和遗传多样性的下降越来越引起人们的关注。假设被引进的个体在易位后能够成功繁殖，遗传救助或用基因不同来源的个体补充不断减少的种群可能有助于人口统计和基因恢复工作。但是，居民和外来人口的相对生殖贡献并不经常被评估。在美国密歇根州的北部下部半岛，有十四条褐鳟（Salmo trutta）将来自三个不同支流的每一个）引入研究流（亨特克里克），以补充少量孤立的常住鳟鱼种群。与居民相比，三个易位人群的平均预期杂合度和平均等位基因丰富度不同。此外，等位基因频率的人群间差异（F _ST）和常住人口之间的距离介于0.024至0.098之间。使用遗传育种分配，我们记录了易变种和常驻斑鳟确实杂交。但是，种群内交配事件更为普遍。模拟表明，1岁后代遗传多样性的增加是易位成年繁殖的结果，因为遗传变异显着高于仅居民间繁殖的预期水平（p <0.001）。为了实现基因拯救计划的管理目标，除收集经验遗传数据以评估引进成果外，还建议管理人员进行模拟和假设检验。