ABSTRACT: Escaped farmed Atlantic salmon represent a well-documented and ongoing threat to wild conspecific populations. In Norway, the world-leading producer of farmed salmon, annual monitoring of straying and genetic introgression by farmed escapees in wild salmon rivers has been carried out since the late 1980s. In this study, we applied molecular and statistical methods routinely used in the Norwegian monitoring programme to investigate the magnitude of escaped farmed salmon and genetic introgression in salmon rivers on the west coast of Sweden, where suspected escapees have been observed. Our results confirm that escaped farmed salmon stray, successfully spawn, and produce offspring at levels similar to those observed in neighbouring Norway. These findings raise concerns over population productivity and long-term viability and highlight the need for more permanent monitoring of the presence and consequences of escaped farmed salmon in Swedish salmon rivers. Our results further illustrate that farmed gene flow may constitute a transboundary problem with potential international implications.

中文翻译：

---

瑞典野生鲑鱼种群中养殖流浪和基因渗入的遗传证据

摘要：逃逸的养殖大西洋鲑鱼对野生同种种群构成了有据可查的持续威胁。在世界领先的养殖鲑鱼生产国挪威，自 1980 年代后期以来，每年都会对野生鲑鱼河流中养殖逃逸者的流浪和基因渗入进行监测。在这项研究中，我们应用挪威监测计划中常规使用的分子和统计方法来调查瑞典西海岸鲑鱼河中逃逸的养殖鲑鱼和基因渗入的程度，在那里观察到了疑似逃逸者。我们的结果证实，逃逸的养殖鲑鱼会在与邻国挪威观察到的水平相似的情况下，成功产卵并产生后代。这些发现引起了人们对种群生产力和长期生存能力的担忧，并强调需要对瑞典鲑鱼河流中逃逸的养殖鲑鱼的存在和后果进行更持久的监测。我们的结果进一步说明养殖基因流动可能构成具有潜在国际影响的跨界问题。